High and low temperature test device for gas alarm

Abstract

The embodiment of the invention provides a gas alarm high and low temperature test device which comprises a verification box, a zero gas conveying assembly and a standard gas conveying assembly, the zero gas conveying assembly is communicated with a verification space of the verification box, and the standard gas conveying assembly is communicated with a gas alarm in the verification box; before the blowing test, the zero gas conveying assembly conveys zero gas with a set temperature to the verification space, so that the temperature of the verification space reaches a target temperature; in the blowing test process, the zero gas conveying assembly conveys zero gas at a set temperature to the verification space, so that the temperature of the verification space is kept at a target temperature, and the standard gas conveying assembly conveys standard gas to the gas alarm in the verification box to carry out the blowing test; and after the blowing test is completed, the standard gas conveying assembly stops conveying the standard gas, the first output end of the zero gas conveying assembly conveys the zero gas with the set temperature to the verification space, and the second output end of the zero gas conveying assembly conveys the zero gas with the set temperature to the gas alarm, so that waste gas in the verification space and waste gas in the gas alarm are exhausted from the exhaust port.

Description

Technical Field

[0001] The present application relates to the field of gas alarm detection, and in particular to a high and low temperature test device and a detection method for a gas alarm. Background Art

[0002] Gas alarms, such as carbon monoxide alarms, are widely used in production and life to detect whether there are toxic and harmful gases in the environment. Gas alarms are measuring instruments that require mandatory inspection. Before use, they must obtain a type approval certificate. For this purpose, type tests must be carried out. The test items include working temperature tests (also called high and low temperature tests), that is, testing whether the readings are accurate in high and low temperature environments. During the test, the temperature of the zero gas and standard gas introduced into the gas alarm under test must be consistent with the ambient temperature of the gas alarm under test. For example, the "JJF 1699-2018 Outline for the Evaluation of Carbon Monoxide Detection Alarms for Mining" stipulates:

[0003] 9.2.8.4 Test procedure

[0004] During the test, the temperature of the standard gas sample introduced into the detection alarm is consistent with the test required temperature.

[0005] High temperature working test: Conduct the test according to the method specified in Test Bb of GB / T 2423.2. At a temperature of (40±2)℃, energize the detection alarm and stabilize it for 2h. After the duration is reached, conduct the test according to 9.1.1.4.

[0006] Low temperature working test: Conduct the test according to the method specified in Test Bb of GB / T 2423.2. At a temperature of (0±2)℃, energize the detection alarm and stabilize it for 2h. After the duration is reached, conduct the test according to 9.1.1.4.

[0007] The test procedures specified in 9.1.1.4 are as follows:

[0008] According to the flow rate required by the detection alarm manual, introduce carbon monoxide gas standard substances with a concentration of about 20μmol / mol, 35% of the range, 50% of the range, and 85% of the range, and read the stable indication of the detection alarm (or the signal output value converted into the carbon monoxide concentration value). Measure each point 3 times, and take the arithmetic average as the indication of each point of the detection alarm.

[0009] The Chinese utility model patent with publication number CN218918245U discloses a device for high and low temperature test for gas alarm form evaluation, such as Figure 1 As shown, the device comprises:

[0010] A high and low temperature test box 10, which is used to create an environment of set temperature and set humidity inside the box;

[0011] The built-in test box 20 is arranged inside the high and low temperature test box 10. The built-in test box 20 includes a box body 21, an opening and closing door 22 and an electric opening and closing drive mechanism 23. The box body 21 is provided with an opening. The opening and closing door 22 can be installed at the opening of the box body 21. The electric opening and closing drive mechanism 23 is used to drive the opening and closing of the opening and closing door 22. The box body 21 and the opening and closing door 22 are provided with a transparent window 24 for observing the gas alarm 50 to be tested in the box;

[0012] A gas delivery unit, comprising at least one set of gas delivery pipe groups 31, each set of gas delivery pipe groups 31 comprising three stainless steel gas delivery pipes 311, one end of the stainless steel gas delivery pipe 311 is connected to the outside of the high and low temperature test box 10 and communicates with the gas source, and the other end of the stainless steel gas delivery pipe 311 extends into the built-in test box 20, the length of the stainless steel gas delivery pipe 311 is greater than 1.5m, and the stainless steel gas delivery pipe 311 has multiple bends;

[0013] The exhaust gas extraction unit includes an exhaust pump and an exhaust gas extraction pipeline. The exhaust gas extraction pipeline is connected to the interior of the built-in test box. The exhaust pump extracts the exhaust gas from the built-in test box 20 through the exhaust gas extraction pipeline.

[0014] The built-in test chamber 20 adopts an automatic opening and closing door design. Before the test temperature duration is reached, the opening and closing door is opened, and the temperature and humidity can be quickly transferred to the inside of the built-in test chamber 20, which can ensure that the temperature and humidity conditions inside the built-in test chamber 20 are consistent with those of the high and low temperature test chamber; after the test temperature duration is reached, the opening and closing door is automatically closed, and the gas standard substance is transported to the alarm sensor for testing. The sealed built-in test chamber 20 can prevent the escape of toxic gases after the test, and the gases are discharged through the exhaust gas extraction unit after the test, thereby improving the safety of the test.

[0015] The high and low temperature test box 10 of the utility model provides a temperature of -40°C to 70°C and a humidity of 93%RH.

[0016] Technical problems existing in the prior art:

[0017] During the process of transporting the gas standard substance to the alarm sensor in the built-in test chamber 20 for testing, the outside of the built-in test chamber 20 is heated or cooled by the high and low temperature test chamber 10 to control the temperature inside the built-in test chamber 20, that is, heat exchange is performed through the side wall of the built-in test chamber 20, resulting in slow response and low accuracy of temperature control, and the temperature inside the built-in test chamber 20 is not easy to control; and the high and low temperature test process requires multiple air blowing tests. Due to the above-mentioned slow response disadvantage, after each air blowing test, the next air blowing test can only be performed after the temperature inside and outside the built-in test chamber 10 reaches a natural balance. The interval between the two air blowing tests is long, and the efficiency of the high and low temperature test is low. Summary of the invention

[0018] The embodiment of the present application provides a high and low temperature test device for a gas alarm to solve the above-mentioned technical problems.

[0019] Specifically, the embodiment of the present application provides a high and low temperature test device for a gas alarm, which includes:

[0020] A test box, the test box comprising a test space for accommodating the gas alarm to be tested and an exhaust port connected to the test space and the gas alarm;

[0021] A zero gas delivery component, wherein a first output end of the zero gas delivery component is connected to the calibration space and is used to deliver zero gas to the calibration space; a second output end of the zero gas delivery component is connected to the gas alarm in the calibration box and is used to deliver zero gas to the gas alarm in the calibration box;

[0022] A standard gas delivery component, the output end of which is connected to the gas alarm in the calibration box, and is used to deliver standard gas to the gas alarm in the calibration box;

[0023] Before the high and low temperature test device performs a blow test on the gas alarm, the first output end of the zero gas delivery component delivers zero gas of a set temperature to the calibration space, so that the temperature of the calibration space reaches the target temperature;

[0024] During the air blowing test of the gas alarm by the high and low temperature test device, the first output end of the zero gas delivery component delivers zero gas of a set temperature to the calibration space, so that the temperature of the calibration space is maintained at the target temperature, and at the same time, the standard gas delivery component delivers standard gas to the gas alarm in the calibration box for air blowing test;

[0025] After the high and low temperature testing device completes the air blowing test on the gas alarm, the standard gas delivery component stops delivering standard gas to the gas alarm in the calibration box; the first output end of the zero gas delivery component delivers zero gas of a set temperature to the calibration space, and the second output end of the zero gas delivery component delivers zero gas of a set temperature to the gas alarm, so that the exhaust gas in the gas alarm and the exhaust gas in the calibration space are discharged from the exhaust port.

[0026] In an optional embodiment of the present application, before the high and low temperature test device performs a blowing test on the gas alarm, the flow rate of zero gas delivered by the first output end of the zero gas delivery component is a first sub-flow rate V11, and the flow rate of zero gas delivered by the second output end of the zero gas delivery component is a second sub-flow rate V12;

[0027] During the blowing test of the gas alarm by the high and low temperature test device, the flow rate of the zero gas delivered by the first output end of the zero gas delivery component is the second flow rate V2;

[0028] After the high and low temperature test device has completed the blowing test on the gas alarm, the flow rate of zero gas delivered by the first output end of the zero gas delivery component is the third sub-flow rate V31, and the flow rate of zero gas delivered by the second output end of the zero gas delivery component is the fourth sub-flow rate V32;

[0029] Among them, V11+V12=V2=V31+V32.

[0030] In an optional implementation manner of the present application, the high and low temperature test device further comprises a control unit, and the control unit is electrically connected to the zero gas delivery assembly and the standard gas delivery assembly;

[0031] Before the high and low temperature test device performs a blow test on the gas alarm, the control unit controls the first output end of the zero gas delivery component to deliver zero gas of a set temperature to the calibration space and the second output end of the zero gas delivery component to deliver zero gas of a set temperature to the gas alarm, so that the calibration space and the environment where the gas alarm is located both reach the target temperature;

[0032] After the temperature of the calibration space and the temperature of the environment in which the gas alarm is located reach the target temperature, the control unit controls the first output end of the zero gas delivery component to deliver zero gas of a set temperature to the calibration space, so that the temperature of the calibration space is maintained at the target temperature; at the same time, the control unit controls the standard gas delivery component to deliver standard gas to the gas alarm in the calibration box for a blow test.

[0033] In an optional implementation of the present application, a gas sensor is provided in the calibration box for detecting the exhaust gas concentration in the calibration space;

[0034] The high and low temperature test device further comprises a control unit, which is electrically connected to the zero gas delivery assembly, the standard gas delivery assembly and the gas sensor;

[0035] Before the high and low temperature test device performs a blowing test on the gas alarm, the control unit controls the gas sensor to detect the current exhaust gas concentration value of the calibration space;

[0036] If the current exhaust gas concentration value is not higher than the preset exhaust gas concentration value, the control unit controls the first output end of the zero gas delivery component to deliver zero gas of a set temperature to the inspection space, and controls the standard gas delivery component to deliver standard gas to the gas alarm to perform a blow test;

[0037] If the current exhaust gas concentration value is higher than the preset exhaust gas concentration value, the control unit controls the first output end of the zero gas delivery component to deliver zero gas of the set temperature to the inspection space, and controls the second output end of the zero gas delivery component to deliver zero gas of the set temperature to the gas alarm, so that the exhaust gas in the inspection space and the exhaust gas in the gas alarm are discharged from the exhaust port, and the temperature of the inspection space and the ambient temperature of the gas alarm reach the target temperature.

[0038] In an optional implementation manner of the present application, the zero air delivery assembly includes:

[0039] A zero gas delivery pipeline, comprising a zero gas input pipeline, a first zero gas output pipeline and a second zero gas output pipeline, wherein the input end of the zero gas input pipeline is used to input zero gas, the output end of the zero gas input pipeline is connected to the input end of the first zero gas output pipeline and the input end of the second zero gas output pipeline, the first output end of the zero gas delivery pipeline is arranged at the output end of the first zero gas output pipeline, and the second output end of the zero gas delivery pipeline is arranged at the output end of the second zero gas output pipeline;

[0040] A first zero gas flow controller is arranged on the first zero gas output pipeline, and the first zero gas flow controller is used to adjust the flow rate of zero gas outputted by the first zero gas output pipeline;

[0041] A second zero gas flow controller is arranged on the second zero gas output pipeline, and the second zero gas flow controller is used to adjust the flow rate of zero gas outputted by the second zero gas output pipeline;

[0042] A zero gas temperature control unit is arranged on the zero gas input pipeline, and the zero gas temperature control unit is used to adjust the temperature of the zero gas output by the zero gas delivery pipeline to reach a set temperature.

[0043] In an optional implementation manner of the present application, the zero air temperature control unit includes:

[0044] A zero gas refrigerator is arranged on the zero gas input pipeline and is used to cool the zero gas flowing through the zero gas refrigerator;

[0045] A zero gas heater is arranged on the zero gas input pipeline and downstream of the zero gas refrigerator, and the zero gas heater is used to heat the zero gas flowing through the zero gas heater;

[0046] During the low temperature test of the gas alarm by the high and low temperature testing device, the zero gas refrigerator cools the zero gas flowing through the zero gas refrigerator to a first temperature, which is lower than a set temperature; the zero gas heater heats the zero gas output from the zero gas refrigerator so that the zero gas transmission pipeline outputs zero gas of the set temperature.

[0047] In an optional implementation manner of the present application, a calibration pressure sensor is provided in the calibration box;

[0048] The first zero gas flow controller and the second zero gas flow controller are used to adjust the flow rate of the zero gas delivered by the zero gas delivery pipeline according to the pressure value detected by the calibration pressure sensor, so that the pressure of the calibration space is maintained within a preset pressure range; or

[0049] The first zero gas flow controller is used to adjust the flow of the zero gas delivered by the first zero gas output pipeline according to the pressure value detected by the calibration pressure sensor, so that the pressure of the calibration space is maintained within a preset pressure range.

[0050] In an optional embodiment of the present application, the standard gas delivery assembly includes a temperature control box for controlling the temperature of the standard gas;

[0051] The high and low temperature test device also includes a coil arranged in a temperature control box. The coil is also arranged on the zero gas input pipeline and is located upstream of the zero gas temperature control unit. The coil can perform heat exchange with the temperature control box to preheat or precool the zero gas flowing through the coil.

[0052] In an optional implementation manner of the present application, the zero gas delivery assembly further includes: a first zero gas temperature sensor, disposed at a first output end of the first zero gas output pipeline, for detecting the temperature of the zero gas outputted from the first output end of the first zero gas output pipeline;

[0053] The zero gas temperature control unit is used to adjust the temperature of the zero gas flowing through the zero gas temperature control unit according to the temperature value detected by the first zero gas temperature sensor, so that the zero gas outputted from the first output end of the first zero gas output pipeline reaches a set temperature.

[0054] In an optional implementation manner of the present application, the zero air delivery assembly further includes:

[0055] a first zero gas temperature sensor, disposed at a first output end of the first zero gas output pipeline, and used to detect the temperature of the zero gas outputted from the first output end of the first zero gas output pipeline;

[0056] A calibration temperature sensor is arranged in the calibration box, and the calibration temperature sensor is used to detect the temperature of the calibration space;

[0057] The zero gas temperature control unit is used to adjust the temperature of the zero gas flowing through the zero gas temperature control unit according to the temperature value detected by the verification temperature sensor and the temperature value detected by the first zero gas temperature sensor.

[0058] In an optional implementation manner of the present application, the high and low temperature test device further comprises a control unit, and the control unit is electrically connected to the zero gas temperature control unit, the first zero gas temperature sensor, the verification temperature sensor, and the standard gas delivery assembly;

[0059] When the temperature value detected by the first zero-gas temperature sensor reaches the set temperature and the temperature value detected by the verification temperature sensor reaches the target temperature, the control unit controls the zero-gas temperature control unit to maintain the current heating amount so that the temperature value detected by the verification temperature sensor is maintained at the target temperature;

[0060] When the temperature value detected by the first zero-gas temperature sensor reaches a set temperature and the temperature value detected by the verification temperature sensor is lower than a target temperature, the control unit controls the zero-gas temperature control unit to increase the heating amount so that the temperature value detected by the verification temperature sensor reaches the target temperature;

[0061] When the temperature value detected by the first zero-gas temperature sensor reaches the set temperature and the temperature value detected by the verification temperature sensor is higher than the target temperature, the control unit controls the zero-gas temperature control unit to reduce the heating amount or stop heating so that the temperature value detected by the verification temperature sensor reaches the target temperature.

[0062] A calibration temperature sensor is provided in the calibration box, and the calibration temperature sensor is used to detect the temperature of the calibration space;

[0063] The zero-gas temperature control unit is used to adjust the temperature of the zero-gas flowing through the zero-gas temperature control unit according to the temperature value detected by the calibration temperature sensor, so that the temperature of the calibration space reaches the target temperature.

[0064] In an optional embodiment of the present application, the standard gas delivery assembly includes:

[0065] A temperature control box, a standard gas tank, a standard gas control valve, a standard gas flow controller, and a standard gas temperature control unit. The standard gas tank, the standard gas control valve, and the standard gas flow controller are all arranged in the temperature control box;

[0066] The standard gas tank is connected to the input end of the standard gas flow controller through the standard gas control valve, and the output end of the standard gas flow controller is connected to the gas alarm in the calibration box;

[0067] The standard gas tank is used to contain standard gas;

[0068] The standard gas control valve is used to control the opening and closing of the standard gas and to reduce the pressure of the standard gas;

[0069] The standard gas flow controller is used to adjust the flow rate of the standard gas;

[0070] The standard gas temperature control unit is used to adjust the temperature in the temperature control box to a required temperature.

[0071] In an optional embodiment of the present application, the standard gas delivery assembly further includes: a first standard gas temperature sensor, disposed in the temperature control box, for detecting the temperature in the temperature control box; the standard gas temperature control unit is used to adjust the temperature in the temperature control box to a desired temperature according to the temperature value detected by the first standard gas temperature sensor; or

[0072] The standard gas delivery component also includes: a second standard gas temperature sensor, which is arranged at the output end of the standard gas delivery component and is used to detect the temperature of the standard gas output from the output end of the standard gas delivery component; the standard gas temperature control unit is used to adjust the temperature of the standard gas output from the output end of the standard gas delivery component to a target temperature according to the temperature value detected by the second standard gas temperature sensor; or

[0073] The standard gas delivery component also includes a first standard gas temperature sensor and a second standard gas temperature sensor. The first standard gas temperature sensor is arranged in the temperature control box, and the first standard gas temperature sensor is used to detect the temperature in the temperature control box; the second standard gas temperature sensor is arranged at the output end of the standard gas delivery component, and the second standard gas temperature sensor is used to detect the temperature of the standard gas output from the output end of the standard gas delivery component; the standard gas temperature control unit is used to adjust the temperature of the standard gas output from the output end of the standard gas delivery component to the target temperature according to the temperature value detected by the first standard gas temperature sensor and the temperature value detected by the second standard gas temperature sensor.

[0074] Beneficial effects:

[0075] The first output end of the zero gas delivery component of the embodiment of the present application is used to deliver zero gas of a set temperature to the calibration space to control the temperature of the calibration space, and the standard gas delivery component is used to deliver standard gas to the gas alarm in the calibration box for testing. Compared with the prior art that controls the temperature inside the built-in test box through the side wall conduction of the built-in test box by external heating or cooling of the built-in test box, the first output end of the zero gas delivery component of the embodiment of the present application can deliver zero gas of a set temperature to the calibration space to keep the temperature of the calibration space at the target temperature, or to keep the temperature of the calibration space constant at the target temperature, so as to avoid the temperature change of the calibration space affecting the test of the gas alarm. The first output end of the zero gas delivery assembly of the embodiment of the present application can directly deliver zero gas of set temperature to the calibration space without the need for heat exchange through spaced components such as side walls for temperature control. Therefore, compared with the prior art, the embodiment of the present application is conducive to controlling the temperature of the calibration space. Moreover, the embodiment of the present application directly uses zero gas to pass into the calibration space to achieve temperature control. Compared with using spaced components such as side walls for heat exchange to achieve temperature control, the temperature control response of the embodiment of the present application is faster and more accurate, and can achieve precise control of the temperature in the calibration box. Therefore, during the high and low temperature test process, the temperature and humidity of the environment in which the gas alarm is located can be kept constant, which can improve the accuracy of the gas alarm test results.

[0076] The first output end of the zero gas delivery component can introduce zero gas of a set temperature into the calibration box to discharge the waste gas in the calibration space from the exhaust port in time, and the second output end of the zero gas delivery component can deliver zero gas of a set temperature to the gas alarm to discharge the waste gas in the gas alarm and the waste gas in its environment from the exhaust port, so as to avoid the waste gas remaining in the gas alarm and the calibration space from affecting the test of the gas alarm. Therefore, between the two inputs of standard gas to test the gas alarm, the exhaust gas discharged by zero gas can prevent the waste gas remaining from the previous test from affecting the next test. Compared with the prior art, which has a separate device for heating the box and a separate exhaust device for discharging waste gas, the embodiment of the present application can realize the exhaust gas discharge and heating or cooling functions only through the zero gas delivery component.

[0077] In addition, compared with the conventional solution of directly heating or cooling the outside or inside of the test box, the embodiment of the present application introduces zero air into the calibration box to achieve temperature control. The flowing zero air also stirs the environment inside the calibration box, thereby making the temperature inside the calibration box more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0079] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0080] Figure 1 This is a schematic diagram of a device for high and low temperature testing of gas alarm types in the prior art.

[0081] Figure 2 This is a circuit diagram of the high and low temperature test device provided in an embodiment of the present application.

[0082] Figure 3 This is a circuit diagram of the high and low temperature test device provided in an embodiment of the present application.

[0083] Figure 4 This is a structural diagram of the high and low temperature test device provided in an embodiment of the present application.

[0084] Figure 5 This is a structural diagram of the high and low temperature test device provided in an embodiment of the present application.

[0085] Figure 6 This is a structural diagram of the high and low temperature test device provided in an embodiment of the present application.

[0086] Figure 7 This is a structural diagram of the high and low temperature test device provided in an embodiment of the present application.

[0087] Figure 8 This is a structural diagram of the high and low temperature test device provided in an embodiment of the present application.

[0088] In the figure:

[0089] 100. High and low temperature test equipment;

[0090] 10. Verification box; 11. First connecting component; 12. Second connecting component; 13. Detection space; 14. Exhaust port; 16. Verification temperature sensor; 17. Verification pressure sensor; 18. Gas sensor;

[0091] 20. Zero gas delivery assembly; 20a. Zero gas temperature control unit; 21. Zero gas delivery pipeline; 21a. First zero gas output pipeline; 21b. Second zero gas output pipeline; 21c. Zero gas input pipeline; 23. Zero gas control valve; 24a. First zero gas flow controller; 24b. Second zero gas flow controller; 25. Zero gas refrigerator; 251. Second zero gas temperature sensor; 26. Zero gas heater; 27. Three-way valve; 28. Two-position three-way valve; 29. ​​First zero gas temperature sensor; 211. First output terminal; 212. Second output terminal; 213. Zero gas input terminal;

[0092] 30. Standard gas delivery assembly; 30a. Standard gas temperature control unit; 31. Temperature control box; 32. Standard gas tank; 33. Standard gas control valve; 34. Standard gas flow controller; 35. Standard gas refrigerator; 35a. Compressor; 35b. Condenser; 35c. Expansion valve 35d. Evaporator; 36. Standard gas heater; 37. First standard gas temperature sensor; 39. Second standard gas temperature sensor; 302. Output end;

[0093] 40. Exhaust pipeline; 41. Exhaust fan; 42. One-way valve;

[0094] 50. Tee connector;

[0095] 60. Calibration cover; 61. Calibration cover body; 62. Connecting pipe; 611. Gas inlet; 612. Gas outlet; 613. Calibration space;

[0096] 70. Coil;

[0097] 80. Alarm unit;

[0098] 90. Control unit. DETAILED DESCRIPTION

[0099] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. All other embodiments obtained by those skilled in the art without creative work based on the embodiments in the present application belong to the scope of protection of the present application.

[0100] Reference to "embodiment" or "implementation" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment or implementation may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0101] like Figure 2 and Figure 5 As shown, the present invention provides a high and low temperature test device 100 for a gas alarm A, which includes a calibration box 10, a zero gas delivery component 20 and a standard gas delivery component 30. The calibration box 10 includes a calibration space 13 for accommodating the gas alarm A to be tested and an exhaust port 14 connected to the calibration space 13 and the gas alarm A; the first output end 211 of the zero gas delivery component 20 is connected to the calibration space 13 for delivering zero gas to the calibration space 13; the second output end 212 of the zero gas delivery component 20 is connected to the gas alarm A in the calibration box 10 for delivering zero gas to the gas alarm A in the calibration box 10; the output end 302 of the standard gas delivery component 30 is connected to the gas alarm A in the calibration box 10 for delivering standard gas to the gas alarm A in the calibration box 10.

[0102] Before the high and low temperature test device 100 performs a blow test on the gas alarm A, the first output end 211 of the zero gas delivery component 20 delivers zero gas of a set temperature to the calibration space 13, so that the temperature of the calibration space 13 reaches the target temperature; during the high and low temperature test device 100 performs a blow test on the gas alarm A, the first output end 211 of the zero gas delivery component 20 delivers zero gas of a set temperature to the calibration space 13, so that the temperature of the calibration space 13 is maintained at the target temperature, and at the same time, the standard gas delivery component 30 delivers standard gas to the calibration box 1 0 for blowing test to the gas alarm A; after the high and low temperature testing device 100 completes the blowing test on the gas alarm A, the standard gas delivery component 30 stops delivering standard gas to the gas alarm A in the calibration box 10; the first output end 211 of the zero gas delivery component 20 delivers zero gas of the set temperature to the calibration space 13, and the second output end 212 of the zero gas delivery component 20 delivers zero gas of the set temperature to the gas alarm A, so that the exhaust gas in the gas alarm A and the exhaust gas in the calibration space 13 are discharged from the exhaust port 14.

[0103] The first output end 211 of the zero gas delivery component 20 of the embodiment of the present application is used to deliver zero gas of a set temperature to the calibration space 13 to control the temperature of the calibration space 13, and the standard gas delivery component 30 is used to deliver standard gas to the gas alarm A in the calibration box 10 for testing. Compared with the prior art that controls the temperature inside the built-in test box by external heating or cooling of the built-in test box and heat conduction through the side wall of the built-in test box, the first output end 211 of the zero gas delivery component 20 of the embodiment of the present application can deliver zero gas of a set temperature to the calibration space 13 to keep the temperature of the calibration space 13 at the target temperature, or to keep the temperature of the calibration space 13 constant at the target temperature, so as to avoid the temperature change of the calibration space 13 affecting the test of the gas alarm A. The first output end 211 of the zero gas delivery component 20 of the embodiment of the present application can directly deliver the zero gas of the set temperature to the calibration space 13 without the need for heat exchange through the spaced components such as the side wall for temperature control. Therefore, compared with the prior art, the embodiment of the present application is conducive to controlling the temperature of the calibration space 13. Moreover, the embodiment of the present application directly uses zero gas to pass into the calibration space 13 to achieve temperature control. Compared with the use of spaced components such as the side wall for heat exchange to achieve temperature control, the temperature control response of the embodiment of the present application is faster and more accurate, and can achieve precise control of the temperature in the calibration box 10. Therefore, during the high and low temperature test process, the temperature and humidity of the environment in which the gas alarm A is located can be kept constant, which can improve the accuracy of the test results of the gas alarm A.

[0104] The first output end 211 of the zero gas delivery component 20 can introduce zero gas of a set temperature into the calibration box 10 to discharge the waste gas in the calibration space 13 from the exhaust port 14 in time, and the second output end 212 of the zero gas delivery component 20 can deliver zero gas of a set temperature to the gas alarm A to discharge the waste gas in the gas alarm A and the waste gas in the environment where it is located from the exhaust port 14, so as to avoid the waste gas remaining in the gas alarm A and the calibration space 13 from affecting the test of the gas alarm A. Therefore, between two adjacent inputs of standard gas to test the gas alarm A, the exhaust gas discharged by zero gas can prevent the waste gas remaining in the previous test from affecting the next test. Compared with the prior art, which is separately set as a device for heating the box body and a separately set exhaust gas exhaust device for exhausting waste gas, the embodiment of the present application can realize the exhaust gas exhaust and heating or cooling functions only through the zero gas delivery component 20.

[0105] In addition, compared with the conventional solution of directly heating or cooling the outside or inside of the test box, the embodiment of the present application introduces zero air into the calibration box 10 to achieve temperature control. The flowing zero air also stirs the environment inside the calibration box 10, thereby making the temperature inside the calibration box 10 more uniform.

[0106] Among them, the exhaust gas should be understood as the gas containing standard gas components remaining in the inspection space 13 and / or in the gas alarm A and its environment after the high and low temperature testing device 100 performs a blowing test on the gas alarm A; when the standard gas is carbon monoxide, the exhaust gas is the gas containing carbon monoxide.

[0107] Among them, the high and low temperature test device 100 for the high and low temperature test of the gas alarm A may include a high temperature test for the gas alarm A, and may also include a low temperature test for the gas alarm A. The high and low temperature test device 100 includes at least n blowing tests during the high temperature test and the low temperature test of the gas alarm A. The high and low temperature test device 100 of the embodiment of the present application performs a high and low temperature test on the gas alarm A. When the gas alarm A is a carbon monoxide detection alarm for mining, it can be carried out according to the high temperature working test procedure and low temperature working test procedure of the gas alarm specified in 9.2.8.4 of the "JJF 1699-2018 Outline for the Form Evaluation of Carbon Monoxide Detection Alarms for Mining". In the high temperature working test procedure or the low temperature working test procedure, the standard gas delivery component 30 respectively introduces carbon monoxide gas standard substances with a concentration of about 20μmol / mol, a range of 35%, a range of 50%, and a range of 85% into the gas alarm A, and reads the stable indication of the gas alarm A (or the signal output value is converted into a carbon monoxide concentration value). Each concentration is measured 3 times, and the arithmetic mean is taken as the indication of each concentration of gas alarm A to complete the test. During the high temperature test or low temperature test, 12 blowing tests are required, that is, n = 12. It should be understood that when the type of gas alarm A is different, high and low temperature tests need to be carried out according to the corresponding form evaluation outline, so the composition, concentration and number of standard gases delivered to alarm A will also be different, and n is not limited to 12.

[0108] The n times of air blowing tests performed by the high and low temperature test device 100 of the embodiment of the present application on the gas alarm A include the first air blowing test, one or more intermediate air blowing tests and the last air blowing test. Among them, the first air blowing test and any intermediate air blowing test can be referred to as non-last air blowing tests.

[0109] Herein, unless otherwise specified, "before the air blow test" may be before any air blow test, "during the air blow test as defined herein" may be during any air blow test, and "after the air blow test as defined herein" may be after any air blow test is completed.

[0110] Please continue reading Figure 2The high and low temperature test device 100 further includes a control unit 90, which is electrically connected to the zero gas delivery assembly 20 and the standard gas delivery assembly 30. The control unit 90 can control the zero gas delivery assembly 20 to deliver zero gas of a set temperature, and control the standard gas delivery assembly 30 to deliver standard gas of a required temperature.

[0111] It should be noted that in order to improve the accuracy of the high and low temperature test results of the high and low temperature test device 100 on the gas alarm A, before the high and low temperature test device 100 of the embodiment of the present application performs a blow test on the gas alarm A, the control unit 90 controls the first output end 211 of the zero gas delivery component 20 to deliver zero gas of the set temperature to the calibration space 13 and the second output end 212 of the zero gas delivery component 20 to deliver zero gas of the set temperature to the gas alarm A, so that the calibration space 13 and the environment where the gas alarm A is located reach the target temperature. After the temperature of the calibration space 13 and the temperature of the environment where the gas alarm A is located reach the target temperature, the high and low temperature test device 100 performs a blow test on the gas alarm A again. Specifically, the control unit 90 controls the first output end 211 of the zero gas delivery component 20 to deliver zero gas of a set temperature to the calibration space 13, so that the temperature of the calibration space 13 is maintained at the target temperature. The control unit 90 controls the second output end 212 of the zero gas delivery component 20 to stop delivering zero gas to the gas alarm A. At the same time, the control unit 90 controls the standard gas delivery component 30 to deliver standard gas to the calibration box 10 to perform a blow test on the gas alarm A.

[0112] In an optional embodiment of the present application, before the high and low temperature test device 100 performs an air blowing test on the gas alarm A, the high and low temperature test device 100 first introduces zero gas into the gas alarm A to perform zero point calibration, and then performs an air blowing test on the gas alarm A. Exemplarily, first, the control unit 90 controls the first output end 211 of the zero gas delivery component 20 to deliver zero gas of a set temperature to the calibration space 13, so that the target temperature is reached in the calibration space 13; then, the control unit 90 controls the second output end 212 of the zero gas delivery component 20 to deliver zero gas of a set temperature to the gas alarm A, so as to perform zero point calibration on the gas alarm A, and at the same time, the control unit 90 controls the first output end 211 of the zero gas delivery component 20 to deliver zero gas of a set temperature to the calibration space 13, so that the temperature of the calibration space 13 is maintained at the target temperature.

[0113] It can be understood that after the high and low temperature testing device 100 introduces zero gas into the gas alarm A for zero point calibration, there is no exhaust gas in the inspection space 13 and the gas alarm A. Therefore, the air blowing test can be carried out directly without introducing zero gas into the inspection space 13 and the gas alarm A to discharge the exhaust gas.

[0114] It can also be understood that the high and low temperature testing device 100 only needs to be calibrated once during the entire high and low temperature testing process of the gas alarm A.

[0115] In one case, after the temperature of the test space 13 reaches the target temperature, the control unit 90 performs zero-point calibration on the gas alarm A. In another case, after the temperature of the test space 13 reaches the target temperature and the ambient temperature of the gas alarm A reaches the target temperature, the control unit 90 performs zero-point calibration on the gas alarm A.

[0116] The high-temperature test and low-temperature test of the gas alarm A by the high-temperature and low-temperature test device 100 include the following steps S11, S12, S13 and S14.

[0117] S11: The operator sets the gas alarm A in the calibration box 10, and connects the gas alarm A to the output end 302 of the standard gas delivery component 30 and the second output end 212 of the zero gas delivery component 20. It can be understood that the gas alarm A and the output end 302 of the standard gas delivery component 30 are connected to each other, and the standard gas delivery component 30 can deliver the standard gas to the gas alarm A; the gas alarm A and the second output end 212 of the zero gas delivery component 20 are connected to each other, and the second output end 212 of the zero gas delivery component 20 can deliver the zero gas to the gas alarm A.

[0118] S12: The control unit 90 controls the first output end 211 of the zero gas delivery assembly 20 to deliver zero gas of a set temperature to the calibration space 13, so that the temperature of the calibration space 13 is maintained at a target temperature.

[0119] In another optional embodiment, S12 further includes: the control unit 90 controls the second output end 212 of the zero gas delivery component 20 to deliver zero gas of a set temperature to the gas alarm A, so that the environment of the gas alarm A reaches the target temperature.

[0120] S13: The control unit 90 controls the standard gas delivery component 30 to supply standard gas to the gas alarm A. At the same time, the control unit 90 controls the first output end 211 of the zero gas delivery component 20 to continuously supply zero gas of a set temperature to the calibration space 13, so that the temperature of the calibration space 13 is maintained at the target temperature, and the exhaust gas in the calibration box 10 is discharged from the exhaust port 14.

[0121] Exemplarily, after the zero gas of set temperature is introduced into the calibration space 13 for a set time (such as 2h), or after the temperature in the calibration space 13 reaches the target temperature, the control unit 90 controls the standard gas delivery component 30 to introduce standard gas with a gas concentration of about 20μmol / mol, a range of 35%, a range of 50%, and a range of 85% to the gas alarm A for a puff test, and the gas alarm A measures each concentration 3 times; between two adjacent introductions of standard gas, the control unit 90 controls the second output end 212 of the gas delivery component 20 to deliver the standard gas of set temperature to the gas alarm A, so as to discharge the waste gas inside the gas alarm A and the environment in which it is located to the calibration space 13, so as to avoid the residual waste gas from affecting the next puff test. In the above process, the first output end 211 of the zero gas delivery component 20 continuously introduces the zero gas of set temperature into the calibration space 13, so as to maintain the temperature of the calibration space 13 at the target temperature, and discharge the waste gas in the calibration space 13 from the exhaust port 14.

[0122] S14: After the multiple blowing tests on the gas alarm A are completed, the control unit 90 controls the standard gas delivery component 30 to stop supplying standard gas to the gas alarm A, and the control unit 90 controls the first output end 211 of the zero gas delivery component 20 to continuously supply zero gas of a set temperature to the calibration space 13 to clean the calibration space 13 of the calibration box 10, so that the waste gas in the calibration space 13 is discharged from the exhaust port 14; and the control unit 90 controls the second output end 212 of the zero gas delivery component 20 to deliver zero gas of a set temperature to the gas alarm A to clean the gas alarm A, so that the waste gas in the gas alarm A and the environment in which it is located is discharged to the calibration space. The above steps simultaneously keep the temperature of the calibration space 13 and the environment in which the gas alarm A is located at the target temperature.

[0123] It should be particularly noted that after the above step S14, if it is necessary to perform high and low temperature tests on other gas alarms, continue to introduce zero gas of the set temperature into the inspection space 13 to make the inspection space 13 reach the target temperature before performing high and low temperature tests on other gas alarms; after the above step S14, if it is not necessary to perform high and low temperature tests on other gas alarms, stop introducing zero gas into the inspection space 13.

[0124] Optionally, the control unit 90 is also used to receive a control signal. If after step S14, the control unit 90 receives a control signal to stop the high and low temperature test, the first output end 211 and the second output end 212 of the zero gas delivery component 20 are controlled to stop delivering zero gas; if after step S14, the control unit 90 does not receive a control signal to stop the high and low temperature test, the first output end 211 and the second output end 212 of the zero gas delivery component 20 are controlled to continue delivering zero gas of a set temperature, or to continue delivering zero gas of a set temperature only through the first output end 211. Specifically, it may also include a button or a touch screen electrically connected to the control unit 90, and the operator may send a control signal to stop the high and low temperature test to the control unit 90 through the button or the touch screen.

[0125] Among them, the difference between the high temperature test and the low temperature test of the gas alarm A by the high and low temperature testing device 100 is that during the high temperature test, the target temperature in each step is (40±2)°C; during the low temperature test, the target temperature in each step is (0±2)°C.

[0126] During the high temperature test, it is necessary to transport high temperature zero gas into the calibration box 10 so that the target temperature is reached in the calibration box 10. The temperature of the zero gas is higher than the temperature of the external environment. The zero gas will exchange heat with the external environment to reduce the temperature. If the set temperature of the zero gas is equal to the target temperature, the target temperature may not be reached in the calibration box 10. Therefore, the set temperature of the zero gas should be higher than the target temperature to compensate for the temperature loss caused by the heat exchange between the zero gas and the outside world, so that the target temperature can be reached in the calibration box 10. The set temperature of the zero gas depends on the thermal insulation performance of the equipment. If the thermal insulation performance is very good, the temperature drop caused by the heat exchange between the zero gas and the external environment is very small, and the set temperature of the zero gas can also be equal to the target temperature.

[0127] During the low temperature test, it is necessary to transport low temperature zero gas into the calibration box 10 so that the target temperature is reached in the calibration box 10. The temperature of the zero gas is lower than the temperature of the external environment. The zero gas will exchange heat with the external environment to increase the temperature. If the set temperature of the zero gas is equal to the target temperature, the target temperature may not be reached in the calibration box 10. Therefore, the set temperature of the zero gas should be lower than the target temperature to compensate for the temperature increase caused by the heat exchange between the zero gas and the outside world, so that the target temperature can be reached in the calibration box 10. The set temperature of the zero gas depends on the thermal insulation performance of the equipment. If the thermal insulation performance is very good, the temperature increase caused by the heat exchange between the zero gas and the external environment is very small, and the set temperature of the zero gas can also be equal to the target temperature.

[0128] For example, in the embodiment of the present application, after the operator places the gas alarm A in the calibration box 10 and connects the gas alarm A to the output end 302 of the standard gas delivery assembly 30 and the second output end 212 of the zero gas delivery assembly 20, the overall high and low temperature test process is as follows:

[0129] (1) The first output end 211 of the zero gas delivery component 20 delivers zero gas of a set temperature to the calibration space 13, so that the temperature of the calibration space 13 reaches the target temperature, and the standard gas delivery component 30 does not deliver standard gas;

[0130] (2) The second output end 212 of the zero gas delivery component 20 delivers zero gas of a set temperature to the gas alarm A for zero point calibration. At the same time, the first output end 211 of the zero gas delivery component 20 delivers zero gas of a set temperature to the calibration space 13, so that the temperature of the calibration space 13 is maintained at the target temperature. The standard gas delivery component 30 does not deliver standard gas.

[0131] (3) The standard gas delivery component 30 delivers three times of standard gas with a concentration of about 20 μmol / mol to the gas alarm A.

[0132] When the standard gas delivery component 30 delivers standard gas, the second output end 212 of the zero gas delivery component 20

[0133] No zero gas is delivered; between two adjacent standard gas deliveries by the standard gas delivery component 30, the second output end 212 of the zero gas delivery component 20 delivers zero gas of a set temperature to the gas alarm A, so as to discharge the waste gas inside the gas alarm A and the environment in which it is located into the inspection space 13; during the entire process of this step, the first output end 211 of the zero gas delivery component 20 continuously delivers zero gas of a set temperature into the inspection space 13, so that the waste gas in the inspection space 13 is discharged from the exhaust port

[0134] 14 discharges and maintains the test space 13 at a target temperature;

[0135] (4) The standard gas delivery component 30 stops delivering the standard gas, the first output end 211 of the zero gas delivery component 20 delivers the zero gas of the set temperature to the inspection space 13, and the second output end 212 of the zero gas delivery component 20 delivers the zero gas of the set temperature to the gas alarm A, so that the temperature of the inspection space 13 is maintained at the target temperature, and at the same time, the exhaust gas of the inspection space 13 and the exhaust gas of the gas alarm A are discharged from the exhaust port 14;

[0136] (5) The standard gas delivery component 30 delivers standard gas with a concentration of about 35% of the range three times to perform a puff test on the gas alarm A; when the standard gas delivery component 30 delivers standard gas, the second output end 212 of the zero gas delivery component 20 stops delivering zero gas; between two adjacent standard gas deliveries by the standard gas delivery component 30, the second output end 212 of the zero gas delivery component 20 delivers zero gas of a set temperature to the gas alarm A, so as to discharge the waste gas inside the gas alarm A and the environment in which it is located into the calibration space 13; during the entire process of this step, the first output end 211 of the zero gas delivery component 20 continuously delivers zero gas of a set temperature into the calibration space 13, so that the waste gas in the calibration space 13 is discharged from the exhaust port 14 and the calibration space 13 is kept at the target temperature;

[0137] (6) The standard gas delivery component 30 stops delivering the standard gas, the first output end 211 of the zero gas delivery component 20 delivers the zero gas of the set temperature to the inspection space 13, and the second output end 212 of the zero gas delivery component 20 delivers the zero gas of the set temperature to the gas alarm A, so that the temperature of the inspection space 13 is maintained at the target temperature, and at the same time, the exhaust gas of the inspection space 13 and the exhaust gas of the gas alarm A are discharged from the exhaust port 14;

[0138] (7) The standard gas delivery component 30 delivers standard gas with a concentration of about 50% of the range three times to perform a puff test on the gas alarm A; when the standard gas delivery component 30 delivers the standard gas, the second output end 212 of the zero gas delivery component 20 stops delivering the zero gas; between two adjacent standard gas deliveries by the standard gas delivery component 30, the second output end 212 of the zero gas delivery component 20 delivers zero gas of a set temperature to the gas alarm A, so as to discharge the waste gas inside the gas alarm A and the environment in which it is located into the calibration space 13; during the entire process of this step, the first output end 211 of the zero gas delivery component 20 continuously delivers zero gas of a set temperature into the calibration space 13, so that the waste gas in the calibration space 13 is discharged from the exhaust port 14 and the calibration space 13 is kept at the target temperature;

[0139] (8) The standard gas delivery component 30 stops delivering the standard gas, the first output end 211 of the zero gas delivery component 20 delivers the zero gas of the set temperature to the inspection space 13, and the second output end 212 of the zero gas delivery component 20 delivers the zero gas of the set temperature to the gas alarm A, so that the temperature of the inspection space 13 is maintained at the target temperature, and at the same time, the exhaust gas of the inspection space 13 and the exhaust gas of the gas alarm A are discharged from the exhaust port 14;

[0140] (9) The standard gas delivery component 30 delivers standard gas with a concentration of about 85% of the range three times to perform a puff test on the gas alarm A; when the standard gas delivery component 30 delivers the standard gas, the second output end 212 of the zero gas delivery component 20 stops delivering the zero gas; between two adjacent standard gas deliveries by the standard gas delivery component 30, the second output end 212 of the zero gas delivery component 20 delivers zero gas of a set temperature to the gas alarm A, so as to discharge the waste gas inside the gas alarm A and the environment in which it is located into the calibration space 13; during the entire process of this step, the first output end 211 of the zero gas delivery component 20 continuously delivers zero gas of a set temperature into the calibration space 13, so that the waste gas in the calibration space 13 is discharged from the exhaust port 14 and the calibration space 13 is kept at the target temperature;

[0141] (10) The standard gas delivery component 30 stops delivering the standard gas, the first output end 211 of the zero gas delivery component 20 delivers the zero gas of the set temperature to the inspection space 13, and the second output end 212 of the zero gas delivery component 20 delivers the zero gas of the set temperature to the gas alarm A, so that the temperature of the inspection space 13 is maintained at the target temperature, and at the same time, the exhaust gas of the inspection space 13 and the exhaust gas of the gas alarm A are discharged from the exhaust port 14.

[0142] After the above step (10), if it is necessary to perform high and low temperature tests on other gas alarms, the first output end 211 and the second output end 212 of the zero gas delivery component 20 continue to deliver zero gas of the set temperature, or only the first output end 211 of the zero gas delivery component 20 continues to deliver zero gas of the set temperature, so as to keep the calibration space 13 at the target temperature before performing high and low temperature tests on other gas alarms; after the above step (10), if it is not necessary to perform high and low temperature tests on other gas alarms, the first output end 211 and the second output end 212 of the zero gas delivery component 20 stop delivering zero gas of the set temperature.

[0143] Optionally, during the above step (1), the second output end 212 of the zero gas delivery component 20 delivers zero gas of a set temperature to the gas alarm A, so that the ambient temperature of the gas alarm A reaches the target temperature.

[0144] It should be noted that before each air blowing test, it is necessary to ensure that there is no residual exhaust gas in the inspection space 13, or in other words, before each air blowing test, it is necessary to ensure that the exhaust gas concentration in the inspection space 13 is within a preset range without affecting the accuracy of the current air blowing test.

[0145] like Figure 4 and Figure 5As shown, the high and low temperature test device 100 also includes a gas sensor 18, which is arranged in the calibration box 10, and the gas sensor 18 is used to detect the exhaust gas concentration in the calibration space 13. The gas sensor 18 is electrically connected to the control unit 90, and the gas sensor 18 detects the exhaust gas concentration in the calibration space 13 under the control of the control unit 90. Before the high and low temperature test device 100 performs a blow test on the gas alarm A, the control unit 90 controls the gas sensor 18 to detect the current exhaust gas concentration value in the calibration space 13; if the current exhaust gas concentration value is not higher than the preset exhaust gas concentration value, the control unit 90 controls the first output end 211 of the zero gas delivery component 20 to deliver zero gas of the set temperature to the calibration space 13, and controls the standard gas delivery component 30 to deliver standard gas to the gas alarm A. If the current exhaust gas concentration value is higher than the preset exhaust gas concentration value, the control unit 90 controls the first output end 211 of the zero gas delivery component 20 to continue to deliver zero gas of the set temperature to the inspection space 13 and controls the second output end 212 of the zero gas delivery component 20 to continue to deliver zero gas of the set temperature to the gas alarm A, so that the exhaust gas in the inspection space 13 and the exhaust gas of the gas alarm A are discharged from the exhaust port 14, and the temperature of the inspection space 13 reaches the target temperature.

[0146] like Figure 3 and Figure 5 As shown, the zero gas delivery assembly 20 includes a zero gas delivery pipeline 21, a first zero gas flow controller 24a, a second zero gas flow controller 24b and a zero gas temperature control unit 20a, and the zero gas delivery pipeline 21, the first zero gas flow controller 24a, the second zero gas flow controller 24b and the zero gas temperature control unit 20a are all electrically connected to the control unit 90.

[0147] The zero gas delivery pipeline 21 includes a zero gas input pipeline 21c, a first zero gas output pipeline 21a and a second zero gas output pipeline 21b. The input end 213 of the zero gas input pipeline 21c is used to input zero gas. The input end 213 of the zero gas delivery pipeline 21 can also be called a zero gas inlet 213. The input end 213 of the zero gas delivery pipeline 21 can be connected to an air compressor or a zero gas tank. The input end 213 of the zero gas delivery pipeline 21 is set at the input end of the zero gas input pipeline 21c. Exemplarily, the input end 213 of the zero gas delivery pipeline 21 is the input end 213 of the zero gas input pipeline 21c. When the input end 213 of the zero gas delivery pipeline 21 is connected to the compressor or the zero gas tank, a zero gas control valve 23 is provided on the zero gas input pipeline 21c. The zero gas control valve 23 is used to control the opening and closing of the zero gas delivery pipeline 21, and the zero gas control valve 23 is also used to reduce the pressure of the compressed gas delivered to the zero gas delivery pipeline 21 by the air compressor.

[0148] The output end of the zero gas input pipeline 21c is connected to the input end of the first zero gas output pipeline 21a and the input end of the second zero gas output pipeline 21b. The first output end 211 of the zero gas delivery pipeline 21 is arranged at the output end of the first zero gas output pipeline 21a, and the second output end 212 of the zero gas delivery pipeline 21 is arranged at the output end of the second zero gas output pipeline 21b. Exemplarily, the first output end 211 of the zero gas delivery pipeline 21 is the output end 211 of the first zero gas output pipeline 21a, and the second output end 212 of the zero gas delivery pipeline 21 is the output end 212 of the second zero gas output pipeline 21b. In the embodiment of the present application, the output end 211 of the first zero gas output pipeline 21a may also be referred to as the first output end 211, and the output end 212 of the second zero gas output pipeline 21b may also be referred to as the second output end 212.

[0149] The zero gas temperature control unit 20a is arranged on the zero gas input pipeline 21c. The zero gas temperature control unit 20a is used to adjust the temperature of the zero gas output from the zero gas delivery pipeline 21 to reach the set temperature. The zero gas temperature control unit 20a adjusts the temperature of the zero gas output from the zero gas delivery pipeline 21 to reach the set temperature under the control of the control unit 90.

[0150] The first zero gas flow controller 24a is disposed on the first zero gas output pipeline 21a and is used to adjust the flow rate of zero gas outputted by the first zero gas output pipeline 21a. The first zero gas flow controller 24a adjusts the flow rate of zero gas outputted by the first zero gas output pipeline 21a under the control of the control unit 90.

[0151] The second zero gas flow controller 24b is disposed on the second zero gas output pipeline 21b and is used to adjust the flow rate of zero gas output from the second zero gas output pipeline 21b. The second zero gas flow controller 24b adjusts the flow rate of zero gas output from the second zero gas output pipeline 21b under the control of the control unit 90.

[0152] Exemplarily, the output end of the zero gas input pipeline 21c is connected to the first zero gas output pipeline 21a and the second zero gas output pipeline 21b through the three-way valve 27. It can be understood that the output end of the zero gas input pipeline 21c is connected to the first zero gas output pipeline 21a and the second zero gas output pipeline 21b through the three-way valve 27. Exemplarily, the output end of the zero gas input pipeline 21c is connected to the input end of the three-way valve 27. In an optional embodiment of the present application, the output end of the zero gas temperature control unit 20a is connected to the input end of the three-way valve 27; one output end of the three-way valve 27 is connected to the input end of the first zero gas output pipeline 21a, that is, one output end of the three-way valve 27 is connected to the first zero gas flow controller 24a. The other output end of the three-way valve 27 is connected to the input end of the second zero gas output pipeline 21b, that is, the other output end of the three-way valve 27 is connected to the second zero gas flow controller 24b.

[0153] For example, Figure 4 and Figure 5 As shown, the zero gas temperature control unit 20a includes a zero gas refrigerator 25 and a zero gas heater 26. The zero gas refrigerator 25 is arranged on the zero gas input pipeline 21c, and the zero gas refrigerator 25 is used to cool the zero gas flowing through the zero gas refrigerator 25; the zero gas heater 26 is arranged on the zero gas input pipeline 21c, and the zero gas heater 26 is arranged downstream of the zero gas refrigerator 25, and the zero gas heater 26 is used to heat the zero gas flowing through the zero gas heater 26.

[0154] It should be noted that the control accuracy of the refrigeration device in the prior art is generally worse than that of the heating device. The reason is that the heating device generally adopts resistance wire heating and PID control, which has a fast response time and thus a high temperature control accuracy. However, the control process of the refrigeration device, whether it is a semiconductor refrigerator or a compressor refrigerator, is complex and the control response time is slow, so the temperature control accuracy is low. In order to solve the technical problem in the prior art that the accuracy of the refrigeration device in the cooling condition is not as high as that of the heating device in the heating condition, during the low temperature test of the gas alarm A by the high and low temperature test device 100 of the embodiment of the present application, the zero gas refrigerator 25 cools the zero gas flowing through the zero gas refrigerator 25 to a first temperature (for example, -2°C), and the first temperature is lower than the set temperature (for example, 0°C); the zero gas heater 26 heats the zero gas output from the zero gas refrigerator 25 so that the temperature of the zero gas output from the zero gas delivery pipeline 21 reaches the set temperature. In this embodiment, the control unit 90 is electrically connected to the zero gas refrigerator 25 and the zero gas heater 26. When the high and low temperature testing device 100 performs a low temperature test on the gas alarm A, the control unit 90 controls the zero gas refrigerator 25 to cool the zero gas flowing through the zero gas refrigerator 25 to a first temperature; then the control unit 90 controls the zero gas heater 26 to heat the zero gas output from the zero gas refrigerator 25 so that the temperature of the zero gas output from the zero gas delivery pipeline 21 reaches the set temperature.

[0155] In the process of low temperature test on gas alarm A, the high and low temperature test device 100 of the embodiment of the present application first cools the zero gas to a first temperature below the set temperature through the zero gas refrigerator 25, and then heats the zero gas to reach the set temperature through the zero gas heater 26, which is equivalent to first roughly adjusting the temperature of the zero gas through the zero gas refrigerator 25 with lower adjustment accuracy, and then finely adjusting the temperature of the zero gas through the zero gas heater 26 with higher adjustment accuracy, so that the zero gas temperature output by the zero gas input pipeline 21c is finally accurately controlled, and then the temperature of the calibration space 13 in the calibration box 10 can be accurately controlled to reach the target temperature. Compared with the technical solution of directly cooling or heating, the embodiment of the present application can improve the accuracy of the zero gas temperature.

[0156] It should be noted that, in the embodiment of the present application, the first temperature is lower than and close to the set temperature, for example, the first temperature is 2-4° C. lower than the set temperature. If the temperature difference is too large, it is not easy to achieve precise control during heating.

[0157] In this example, please continue to refer to Figure 4 and Figure 5 The high and low temperature test device 100 further includes a second zero gas temperature sensor 251, which is arranged at the output end of the zero gas refrigerator 25, and is used to detect the temperature of the zero gas at the output end of the zero gas refrigerator 25. In the embodiment of the present application, the second zero gas temperature sensor 251 is electrically connected to the control unit 90, and the second zero gas temperature sensor 251 detects the temperature of the zero gas at the output end of the zero gas refrigerator 25 under the control of the control unit 90. During the process of the high and low temperature test device 100 performing a low temperature test on the gas alarm A, the control unit 90 first controls the zero gas refrigerator 25 according to the detection value of the second zero gas temperature sensor 251, so that the temperature of the zero gas at the output end of the zero gas refrigerator 25 is the first temperature and lower than the set temperature, and then controls the zero gas heater 26 to accurately heat the zero gas at the first temperature, so that the temperature of the zero gas at the output end of the zero gas delivery pipeline 21 reaches the set temperature, and then the temperature of the calibration space 13 in the calibration box 10 accurately reaches the target temperature.

[0158] When the high and low temperature test device 100 performs a high temperature test on the gas alarm A, the control unit 90 controls the zero gas heater 26 to heat the zero gas flowing through the zero gas heater 26, so that the zero gas at the output end of the zero gas delivery pipeline 21 reaches the set temperature. When the high and low temperature test device 100 performs a high temperature test on the gas alarm A, the control unit 90 controls the zero gas refrigerator 25 to stop cooling the zero gas flowing through the zero gas refrigerator 25.

[0159] In the present embodiment, the zero-gas refrigerator 25 is a semiconductor refrigeration device, and the zero-gas heater 26 is a resistance heating device (referred to as an electric heater). Both semiconductor refrigeration devices and electric heating devices have the advantages of small size and simple structure, so that the overall device is more compact. It should be understood that the types of the zero-gas refrigerator 25 and the zero-gas heater 26 in the embodiment of the present application are not limited to this, and other types of heating devices and refrigeration devices can also be used. Therefore, the control method of cooling first and then heating in the embodiment of the present application is not only applicable to the case of semiconductor device cooling and electric heating device heating, but can also be applied to other refrigeration devices and heating devices. In other embodiments, the zero gas can also be cooled by a compressor and an evaporator.

[0160] In some cases, the electric heating device is heated by an electric heating wire, and its temperature control technology is very mature. Through PID control, the temperature of the gas output by the zero gas heater 26 can be quickly and accurately reached to the required temperature. However, when controlling the semiconductor refrigeration device, it is necessary to send a specific pulse to it to control the cooling capacity, the response is slow, and the control process is relatively complicated, making it difficult to accurately reach the required temperature of the gas output. Therefore, in the process of performing a low temperature test on the gas alarm A, the high and low temperature test device 100 of the embodiment of the present application first cools the zero gas to a first temperature below the set temperature through the zero gas refrigerator 25, and then heats the zero gas to reach the set temperature through the zero gas heater 26, thereby improving the accuracy of the temperature of the zero gas.

[0161] like Figure 6 As shown, Figure 6 The high and low temperature test device 100 and Figure 5 The difference between the high and low temperature test device 100 shown is that the structure of the zero gas temperature control unit 20a is different, and the zero gas refrigerator 25 and the zero gas heater 26 are in parallel. Figure 6 During the process of the high and low temperature test device 100 shown in the figure performing the low temperature test on the gas alarm A, the zero gas refrigerator 25 cools the zero gas flowing through the zero gas refrigerator 25 under the control of the control unit 90, so that the zero gas at the output end of the zero gas delivery assembly 20 reaches the set temperature, and no longer flows through the zero gas heater 26 for heating. For example, the zero gas cooled by the zero gas refrigerator 25 is directly delivered to the first zero gas output pipeline 21a or the second zero gas output pipeline 21b through the output end of the zero gas input pipeline 21c, and the zero gas of the set temperature is delivered to the calibration space 13 by the output end 211 of the first zero gas output pipeline 21a, or the zero gas of the set temperature is delivered to the gas alarm A by the output end 212 of the second zero gas output pipeline 21b.

[0162] Specifically, the zero gas refrigerator 25 and the zero gas heater 26 are arranged in parallel between the input end 213 and the output end of the zero gas input pipeline 21c, and also include a two-position three-way valve 28, which is arranged on the zero gas input pipeline 21c, and the gas input port of the two-position three-way valve 28 is connected to the input end 213 of the zero gas input pipeline 21c, and the two output ports of the two-position three-way valve 28 are respectively connected to the zero gas refrigerator 25 and the zero gas heater 26. Thus, the zero gas can be selectively delivered to the zero gas refrigerator 25 or the zero gas heater 26 through the two-position three-way valve 28. Exemplarily, other components such as a zero gas control valve 23 can be arranged between the gas input port of the two-position three-way valve 28 and the input end 213 of the zero gas input pipeline 21c, and the zero gas control valve 23 is further described in detail below.

[0163] It should be noted that the refrigeration power of conventional semiconductor refrigeration devices is relatively small. If the zero gas temperature output by the zero gas delivery assembly 20 is low or the flow rate is large, it may be difficult to meet the refrigeration requirements, resulting in the calibration space 13 in the calibration box 10 failing to reach the target temperature during the low temperature test. In order to solve the above technical problems, in an optional embodiment, as Figure 7 As shown, Figure 7 The high and low temperature test device 100 and Figure 5 The difference of the high and low temperature test device 100 shown is that the high and low temperature test device 100 further includes a coil 70 disposed in the temperature control box 31, and the coil 70 is also disposed on the zero gas input pipeline 21c and is located upstream of the zero gas temperature control unit 20a. The coil 70 can perform heat exchange with the temperature control box 31 to preheat or precool the zero gas flowing through the coil 70. It should be noted that, in the case where a zero gas control valve 23 is disposed on the zero gas input pipeline 21c, the coil 70 is disposed downstream of the zero gas control valve 23. Exemplarily, the coil 70 is disposed between the zero gas control valve 23 and the zero gas refrigerator 25 so that the zero gas can perform heat exchange with the environment in the temperature control box 31.

[0164] It should also be noted that during high and low temperature tests, the temperature of the standard gas introduced into the gas alarm A must be within the target temperature range. Therefore, the temperature control box 31 is cooled during low temperature tests and heated during high temperature tests. In this way, the zero gas can be pre-cooled or pre-heated through the coil 70 and the temperature control box 31.

[0165] When conducting a low temperature test, the zero gas first flows through the coil 70, and exchanges heat with the space in the temperature control box 31 in the coil 70 to perform the first temperature reduction, that is, pre-cooling the zero gas flowing through the coil 70. After the first temperature reduction, the zero gas flows through the zero gas refrigerator 25, and the zero gas refrigerator 25 cools the zero gas to the required temperature. The zero gas has been cooled once when it is transported from the coil 70 to the zero gas refrigerator 25, thereby reducing the load of the zero gas refrigerator 25, so that it can cool the zero gas to the required temperature.

[0166] Similarly, when conducting a high temperature test, the coil 70 can also reduce the load of the zero air heater 26. The zero air first flows through the coil 70, and exchanges heat with the space in the temperature control box 31 in the coil 70 to perform the first temperature increase, that is, the zero air flowing through the coil 70 is preheated. After the first temperature increase, the zero air flows through the zero air heater 26, and the zero air heater 26 heats the zero air to the required temperature.

[0167] The standard gas delivery assembly 30 includes a temperature control box 31 for controlling the temperature of the standard gas. The temperature control box 31 and other components of the standard gas delivery assembly 30 are exemplarily described below.

[0168] It should be noted that Figure 7 The coil 70 shown can also be used in Figure 6 In the embodiment shown, for example, a coil 70 is provided upstream of the two-position three-way valve 28. Figure 7 The above contents will not be elaborated here.

[0169] In this embodiment, during the high and low temperature test of the gas alarm A by the high and low temperature test device 100, the first zero gas flow controller 24a and the second zero gas flow controller 24b adjust the flow rate of zero gas delivered by the zero gas delivery pipeline 21 to remain constant, so that the flow rate flowing through the zero gas refrigerator 25 and the zero gas heater 26 is constant, preventing temperature fluctuations caused by flow fluctuations, so that the zero gas delivery pipeline 21 delivers zero gas with stable temperature, so that the temperature in the calibration box 10 remains constant.

[0170] Exemplarily, before the high and low temperature test device 100 performs a blow test on the gas alarm A, the flow rate of zero gas delivered by the first output end 211 of the zero gas delivery component 20 is the first sub-flow rate V11, and the flow rate of zero gas delivered by the second output end 212 of the zero gas delivery component 20 is the second sub-flow rate V12; during the blow test on the gas alarm A by the high and low temperature test device 100, the flow rate of zero gas delivered by the first output end 211 of the zero gas delivery component 20 is the second flow rate V2; after the high and low temperature test device 100 completes the blow test on the gas alarm A, the flow rate of zero gas delivered by the first output end 211 of the zero gas delivery component 20 is the third sub-flow rate V31, and the flow rate of zero gas delivered by the second output end 212 of the zero gas delivery component 20 is the fourth sub-flow rate V32; wherein, V11+V12=V2=V31+V32. Thus, the flow rate of zero gas delivered by the zero gas delivery pipeline 21 remains constant.

[0171] It should be noted that, during the process of the first output end 211 and the second output end 212 of the zero gas delivery component 20 delivering zero gas to discharge the exhaust gas of the inspection space 13 and the exhaust gas of the gas alarm A from the exhaust port 14, it is necessary to ensure that the pressure of the inspection space 13 is within a reasonable range, or within a preset pressure range, to avoid excessive pressure in the inspection space 13.

[0172] like Figure 4-Figure 7 As shown, the high and low temperature test device 100 further includes a calibration pressure sensor 17, which is disposed in the calibration space 13 and is used to detect the pressure of the calibration space 13. The calibration pressure sensor 17 is electrically connected to the control unit 90, and the calibration pressure sensor 17 detects the pressure of the calibration space 13 under the control of the control unit 90.

[0173] In an optional embodiment of the present application, the first zero gas flow controller 24a and the second zero gas flow controller 24b are further used to adjust the flow rate of zero gas delivered by the zero gas delivery pipeline 21 according to the pressure value detected by the calibration pressure sensor 17, so that the pressure of the calibration space 13 is maintained within a preset pressure range. Specifically, the control unit 90 controls the first zero gas flow controller 24a to adjust the flow rate of zero gas delivered to the calibration space 13 by the first zero gas output pipeline 21a according to the pressure value detected by the calibration pressure sensor 17, and the control unit 90 controls the second zero gas flow controller 24b to adjust the flow rate of zero gas delivered to the gas alarm A by the second zero gas output pipeline 21b according to the pressure value detected by the calibration pressure sensor 17, so that the pressure of the calibration space 13 is maintained within a preset pressure range.

[0174] In another optional embodiment of the present application, the first zero gas flow controller 24a is used to adjust the flow of zero gas delivered to the calibration space 13 by the first zero gas output pipeline 21a according to the pressure value detected by the calibration pressure sensor 17, so that the pressure of the calibration space 13 is maintained within a preset pressure range. Specifically, the control unit 90 controls the first zero gas flow controller 24a to adjust the flow of zero gas delivered to the calibration space 13 by the first zero gas output pipeline 21a according to the pressure value detected by the calibration pressure sensor 17, so that the pressure of the calibration space 13 is maintained within the preset pressure range.

[0175] In an optional embodiment, please continue to refer to Figure 4-Figure 7 , the zero gas delivery assembly 20 further includes a first zero gas temperature sensor 29, which is disposed at the first output end 211 of the first zero gas output pipeline 21a. In one case, the first zero gas temperature sensor 29 is directly disposed at the first output end 211 of the first zero gas output pipeline 21a, that is, at a position close to or adjacent to the calibration box 10. In another case, the first zero gas temperature sensor 29 is directly disposed on the calibration box 10, and is located at a position corresponding to the first output end 211 of the first zero gas output pipeline 21a. In yet another case, the first zero gas temperature sensor 29 is disposed on other components such as the first connecting component 11, the first connecting component 11 connects the first output end 211 of the first zero gas output pipeline 21a and the calibration box 10, and the first connecting component 11 communicates the first zero gas output pipeline 21a with the calibration space 13 in the calibration box 10.

[0176] The first zero gas temperature sensor 29 is used to detect the temperature of the zero gas outputted from the first output end 211 of the first zero gas output pipeline 21a. The first zero gas temperature sensor 29 is electrically connected to the control unit 90. The first zero gas temperature sensor 29 detects the temperature of the zero gas outputted from the first output end 211 of the first zero gas output pipeline 21a under the control of the control unit 90.

[0177] The zero gas temperature control unit 20a is used to control the temperature of the zero gas flowing through the zero gas temperature control unit 20a according to the temperature value detected by the first zero gas temperature sensor 29, so that the zero gas outputted from the first output end 211 of the first zero gas output pipeline 21a reaches the set temperature.

[0178] In an optional embodiment, a calibration temperature sensor 16 is provided in the calibration box 10, and the calibration temperature sensor 16 is used to detect the temperature of the calibration space 13, especially the calibration temperature sensor 16 is used to detect the temperature of the calibration space 13 near the gas alarm A. The calibration temperature sensor 16 is electrically connected to the control unit 90, and the calibration temperature sensor 16 detects the temperature of the calibration space 13 under the control of the control unit 90.

[0179] Exemplarily, the calibration temperature sensor 16 is disposed in the calibration box 10, and is close to the position of the calibration box 10 for installing the gas alarm A. After the gas alarm A is loaded into the calibration box 10, the calibration temperature sensor 16 and the gas alarm A are adjacent, so that it can be ensured that the temperature near the gas alarm A reaches the target temperature. Therefore, even if there is a situation where the temperature of the calibration space 13 is uneven, the calibration temperature sensor 16 and the gas alarm A are adjacent in the embodiment of the present application, which can ensure that the temperature near the gas alarm A reaches the target temperature, thereby improving the accuracy of the high and low temperature test results of the high and low temperature test device 100 on the gas alarm A.

[0180] The zero gas temperature control unit 20 a is used to control the temperature of the zero gas flowing through the zero gas temperature control unit 20 a according to the temperature value detected by the calibration temperature sensor 16 , so that the temperature of the calibration space 13 reaches the target temperature.

[0181] In an optional embodiment, a calibration temperature sensor 16 is provided in the calibration box 10, and the zero gas delivery assembly 20 also includes a first zero gas temperature sensor 29. The zero gas temperature control unit 20a is used to control the zero gas temperature flowing through the zero gas temperature control unit 20a according to the temperature value detected by the calibration temperature sensor 16 and the temperature value detected by the first zero gas temperature sensor 29.

[0182] Exemplarily, when the temperature value detected by the first zero gas temperature sensor 29 reaches the set temperature and the temperature value detected by the verification temperature sensor 16 reaches the target temperature, the control unit 90 controls the zero gas temperature control unit 20a to maintain the current heat so that the temperature value detected by the verification temperature sensor 16 is maintained at the target temperature.

[0183] Exemplarily, when the temperature value detected by the first zero air temperature sensor 29 reaches the set temperature and the temperature value detected by the verification temperature sensor 16 is lower than the target temperature, the control unit 90 controls the zero air temperature control unit 20a to increase the heating amount so that the temperature value detected by the verification temperature sensor 16 reaches the target temperature.

[0184] Exemplarily, when the temperature value detected by the first zero air temperature sensor 29 reaches the set temperature and the temperature value detected by the verification temperature sensor 16 is higher than the target temperature, the control unit 90 controls the zero air temperature control unit 20a to reduce the heating amount or stop heating so that the temperature value detected by the verification temperature sensor 16 reaches the target temperature.

[0185] In an optional embodiment, the high and low temperature test device 100 further includes an alarm unit 80, and the alarm unit 80 is electrically connected to the control unit 90. When the control unit 90 determines that the first zero gas temperature sensor 29 and / or the verification temperature sensor 16 are abnormal, the control unit 90 controls the alarm unit 80 to issue an alarm message, and the alarm message includes but is not limited to voice information, text display information, and indicator information. Exemplarily, when the temperature value detected by the first zero gas temperature sensor 29 is lower than the set temperature, and the temperature value detected by the verification temperature sensor 16 reaches the target temperature, the control unit 90 controls the alarm unit 80 to issue an alarm message.

[0186] It can be understood that the first zero gas output pipeline 21a and the second zero gas output pipeline 21b can be understood as two branches of the zero gas input pipeline 21c, the temperature and composition of the zero gas output by the first zero gas output pipeline 21a and the zero gas output by the zero gas input pipeline 21c are basically the same, the temperature and composition of the zero gas output by the second zero gas output pipeline 21b and the zero gas output by the zero gas input pipeline 21c are basically the same, so the temperature and composition of the zero gas output by the first zero gas output pipeline 21a and the zero gas output by the second zero gas output pipeline 21b are basically the same.

[0187] Please continue reading Figure 3-Figure 7The standard gas delivery component 30 includes a temperature control box 31, a standard gas tank 32, a standard gas control valve 33, a standard gas flow controller 34, and a standard gas temperature control unit 30a. The standard gas tank 32, the standard gas control valve 33, and the standard gas flow controller 34 are all arranged in the temperature control box 31; the standard gas in the standard gas tank 32 is kept at a constant temperature by an overall constant temperature method, so that the standard gas in the standard gas tank 32 reaches the temperature of the environment in the temperature control box 31, so that the temperature of the standard gas delivered by the standard gas delivery component 30 is more accurate. Compared with the prior art in which the standard gas can only be heated when the standard gas is output, the standard gas delivery component 30 of this embodiment can adjust the temperature of the standard gas before the standard gas is output, such as cooling or heating. Therefore, the standard gas delivery component 30 of the embodiment of the present application has sufficient time for heat exchange, so that the temperature of the standard gas output by the standard gas delivery component 30 to the gas alarm A can reach the target temperature.

[0188] The standard gas tank 32 is connected to the input end of the standard gas flow controller 34 through the standard gas control valve 33, and the output end of the standard gas flow controller 34 is connected to the gas alarm A in the calibration box 10. In this embodiment, the output end of the standard gas flow controller 34 can be understood as the output end 302 of the standard gas delivery component 30.

[0189] The standard gas tank 32 is used to contain standard gas, such as carbon monoxide standard gas. The standard gas control valve 33 is used to control the opening and closing of the standard gas and to reduce the pressure of the standard gas. By controlling the opening and closing of the standard gas control valve 33, the standard gas can be output. Exemplarily, there can be multiple standard gas tanks 32, and each standard gas tank 32 is used to contain standard gas of different concentrations. Correspondingly, there can also be multiple standard gas control valves 33, one standard gas tank 32 is connected to the input end of the standard gas flow controller 34 through a standard gas control valve 33, and each standard gas tank 32 is connected to the input end of the standard gas flow controller 34 through the corresponding standard gas control valve 33, that is, all standard gas control valves 33 are connected to the input end of the standard gas flow controller 34. Therefore, by controlling the opening and closing of each standard gas control valve 33, the corresponding standard gas can be output.

[0190] The standard gas flow controller 34 is used to adjust the flow rate of the standard gas. The standard gas flow controller 34 is electrically connected to the control unit 90. The standard gas flow controller 34 adjusts the flow rate of the standard gas under the control of the control unit 90.

[0191] The standard gas temperature control unit 30a is used to adjust the temperature inside the temperature control box 31 to the required temperature. The standard gas temperature control unit 30a is electrically connected to the control unit 90. The standard gas temperature control unit 30a adjusts the temperature inside the temperature control box 31 to the required temperature under the control of the control unit 90.

[0192] Exemplarily, the standard gas temperature control unit 30a includes a standard gas refrigerator 35 and a standard gas heater 36. The standard gas refrigerator 35 is used to cool the temperature in the temperature control box 31 to a desired temperature, and the standard gas heater 36 is used to heat the temperature in the temperature control box 31 to a desired temperature. The standard gas refrigerator 35 and the standard gas heater 36 are both electrically connected to the control unit 30. The standard gas refrigerator 35 cools the temperature in the temperature control box 31 to a desired temperature under the control of the control unit 90, and the standard gas heater 36 heats the temperature in the temperature control box 31 to a desired temperature under the control of the control unit 90, so that the temperature of the standard gas output by the standard gas delivery component 30 to the gas alarm A can reach the target temperature.

[0193] In order to reduce heat loss in the temperature control box 31 and maintain the temperature in the temperature control box 31 , the side walls of the temperature control box 31 are provided with heat insulating materials.

[0194] Among them, the standard gas refrigerator 35 can refer to the zero gas refrigerator 25, and the standard gas heater 36 can refer to the zero gas heater 26, which will not be repeated here.

[0195] In an optional embodiment of the present application, the standard gas can be refrigerated by a compressor and an evaporator. Figure 5-Figure 7 As shown, the standard gas refrigerator 35 includes a compressor 35a, a condenser 35b, an expansion valve 35c and an evaporator 35d, the output end of the compressor 35a is connected to the input end of the condenser 35b, the output end of the condenser 35b is connected to the input end of the evaporator 35d through the expansion valve 35c, and the output end of the evaporator 35d is connected to the input end of the compressor 35a. Exemplarily, the evaporator 35d is arranged in the temperature control box 31, and the compressor 35a, the condenser 35b and the expansion valve 35c are arranged outside the temperature control box 31.

[0196] When the equipment is running, the compressor 35a compresses the refrigerant and delivers it to the condenser 35b. The temperature of the compressed refrigerant increases and heat is released in the condenser 35b. The refrigerant that releases heat in the condenser 35b flows through the expansion valve 35c. The refrigerant expands in volume after passing through the expansion valve 35c and its temperature decreases. The refrigerant with reduced temperature is delivered to the evaporator 35d and absorbs heat from the evaporator 35d. Finally, the refrigerant that has absorbed heat from the evaporator 35d flows back to the compressor 35a, thereby forming a cycle to continuously transfer heat from the evaporator 35d to the condenser 35b, so that the temperature of the evaporator 35d decreases. In this way, the heat in the temperature control box 31 can be continuously transferred to the outside thereof, so that the temperature in the temperature control box 31 is reduced to the required temperature, so that the temperature of the standard gas delivered to the gas alarm A reaches the target temperature.

[0197] It should be noted that the compressor 35a, the condenser 35b, the expansion valve 35c and the evaporator 35d can also be applied to the zero-gas refrigerator 25, which will not be described in detail here.

[0198] In an optional embodiment of the present application, the standard gas delivery assembly 30 further includes a first standard gas temperature sensor 37, which is disposed in the temperature control box 31, and is used to detect the temperature in the temperature control box 31. The first standard gas temperature sensor 37 is electrically connected to the control unit 90, and the first standard gas temperature sensor 37 detects the temperature in the temperature control box 31 under the control of the control unit 90.

[0199] Exemplarily, the standard gas temperature control unit 30 a is used to adjust the temperature in the temperature control box 31 to a desired temperature according to the temperature value detected by the first standard gas temperature sensor 37 .

[0200] In an optional embodiment of the present application, the standard gas delivery component 30 further includes a second standard gas temperature sensor 39, which is arranged at the output end 302 of the standard gas delivery component 30. In one case, the second standard gas temperature sensor 39 is directly arranged at the output end 302 of the standard gas delivery component 30, that is, close to or adjacent to the calibration box 10. In another case, the second standard gas temperature sensor 39 is directly arranged on the calibration box 10 and is located at a position corresponding to the output end 302 of the standard gas delivery component 30. In another case, the second standard gas temperature sensor 39 is arranged on other components such as the second connecting component 12, and the output end 302 of the standard gas delivery component 30 is connected and communicated with the input end of the second connecting component 12, and the output end of the second connecting component 12 is connected and communicated with the gas alarm A. It can be understood that the input end of the second connecting component 12 is also connected and communicated with the second output end 212 of the zero gas delivery component 20.

[0201] Exemplarily, the high and low temperature testing device 100 also includes a three-way joint 50, the second output end 212 of the zero gas delivery assembly 20 is connected and communicated with one input end of the three-way joint 50; the output end 302 of the standard gas delivery assembly 30 is connected and communicated with the other input end of the three-way joint 50; the output end of the three-way joint 50 is connected and communicated with the input end of the second connecting component 12.

[0202] Exemplarily, the high and low temperature test device 100 further includes a calibration cover 60, the second connecting component 12 is connected and communicated with the calibration cover 60, and the calibration cover 60 is used to cover the gas alarm A located in the calibration box 10. Specifically, the calibration cover 60 includes a calibration cover body 61 and a connecting pipe 62, and the calibration cover body 61 is provided with a calibration space 613, a gas inlet 611 and a gas outlet 612 communicated with the calibration space 613, and the calibration space 613 is used to place the gas alarm A. One end of the connecting pipe 62 is communicated with the gas inlet 611 of the calibration cover body 61, and the other end of the connecting pipe 62 is connected and communicated with the second connecting component 12, so as to connect the second connecting component 12 with the environment where the gas alarm A is located, that is, to connect the second connecting component 12 with the calibration space 613. When it is necessary to conduct a high and low temperature test on the gas alarm A, the gas alarm A is placed in the calibration box 10, and the calibration cover body 61 is covered on the gas alarm A, so that the standard gas delivery component 30 can deliver the standard gas to the gas alarm A through the calibration cover 60, and the second output end 212 of the zero gas delivery component 20 can deliver the zero gas to the gas alarm A through the calibration cover 60. In the process of exhausting the exhaust gas, the exhaust gas can be discharged from the gas outlet 612 to the space outside the calibration cover body 61 and inside the calibration box 10, so that it can be discharged from the exhaust port 14. In order to facilitate the exhaust gas discharge, in an optional embodiment of the present application, the calibration cover body 61 and the gas alarm A are placed close to the exhaust port 14.

[0203] The second standard gas temperature sensor 39 is used to detect the temperature of the standard gas delivered by the output end 302 of the standard gas delivery component 30. The second standard gas temperature sensor 39 is electrically connected to the control unit 90, and the second standard gas temperature sensor 39 detects the temperature of the standard gas delivered by the output end 302 of the standard gas delivery component 30 under the control of the control unit 90.

[0204] Exemplarily, the standard gas temperature control unit 30 a is used to adjust the temperature of the standard gas output from the output end 302 of the standard gas delivery component 30 to a target temperature according to the temperature value detected by the second standard gas temperature sensor 39 .

[0205] In an optional embodiment of the present application, the standard gas delivery component 30 also includes a first standard gas temperature sensor 37 and a second standard gas temperature sensor 39, and the standard gas temperature control unit 30a is used to adjust the temperature of the standard gas output from the output end 302 of the standard gas delivery component 30 to the target temperature according to the temperature value detected by the first standard gas temperature sensor 37 and the temperature value detected by the second standard gas temperature sensor 39.

[0206] Exemplarily, when the temperature value detected by the first standard gas temperature sensor 37 reaches the required temperature, and the temperature value detected by the second standard gas temperature sensor 39 reaches the required temperature, the control unit 90 controls the standard gas temperature control unit 30a to maintain the current heating value so that the temperature value detected by the second standard gas temperature sensor 39 is maintained at the required temperature.

[0207] Exemplarily, when the temperature value detected by the first standard gas temperature sensor 37 reaches the required temperature and the temperature value detected by the second standard gas temperature sensor 39 is lower than the target temperature, the control unit 90 controls the standard gas temperature control unit 30a to increase the heating amount until the temperature value detected by the second standard gas temperature sensor 39 reaches the target stability.

[0208] Exemplarily, when the temperature value detected by the first standard gas temperature sensor 37 reaches the required temperature and the temperature value detected by the second standard gas temperature sensor 39 is higher than the target temperature, the control unit 90 controls the standard gas temperature control unit 30a to reduce the heating amount or stop heating until the temperature value detected by the second standard gas temperature sensor 39 reaches the target temperature.

[0209] In an optional embodiment, the control unit 90 controls the alarm unit 80 to issue an alarm message when determining that the first standard gas temperature sensor 37 and / or the second standard gas temperature sensor 39 are abnormal. Exemplarily, when the temperature value detected by the first standard gas temperature sensor 37 is lower than the required temperature, and the temperature value detected by the second standard gas temperature sensor 39 reaches the target temperature, the control unit 90 controls the alarm unit 80 to issue an alarm message.

[0210] like Figure 8 As shown, the high and low temperature test device 100 also includes an exhaust pipeline 40, on which an exhaust fan 41 and an exhaust check valve 42 are provided. The exhaust fan 41 is used to improve the efficiency of exhausting the gas in the calibration box 10, and the exhaust check valve 42 is used to prevent the gas from flowing back. The exhaust fan 41 can be controlled according to the calibration pressure sensor 17 in the calibration box 10. When the calibration pressure sensor 17 detects that the pressure in the calibration box 10 exceeds the set value, the exhaust fan 41 is turned on to exhaust the excess gas in the calibration box 10. The exhaust fan 41 can also continue to operate during the calibration process to exhaust the gas in the calibration box 10.

[0211] The high and low temperature test device 100 of the gas alarm A provided in the embodiment of the present application is introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for technical personnel in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A high and low temperature test device for a gas alarm, characterized in that: include: A test box (10), the test box (10) comprising a test space (13) for accommodating a gas alarm A to be tested, and an exhaust port (14) communicating with the test space (13) and the gas alarm A; A zero gas delivery component (20), wherein a first output end (211) of the zero gas delivery component (20) is in communication with the calibration space (13) and is used to deliver zero gas to the calibration space (13); a second output end (212) of the zero gas delivery component (20) is in communication with a gas alarm A in the calibration box (10) and is used to deliver zero gas to the gas alarm A in the calibration box (10); A standard gas delivery component (30), wherein an output end (302) of the standard gas delivery component (30) is in communication with a gas alarm A in the calibration box (10) and is used for delivering standard gas to the gas alarm A in the calibration box (10); Before the high and low temperature test device (100) performs a blowing test on the gas alarm A, the first output end (211) of the zero gas delivery component (20) delivers zero gas of a set temperature to the inspection space (13), so that the temperature of the inspection space (13) reaches a target temperature; During the process of the high and low temperature test device (100) performing an air blowing test on the gas alarm A, the first output end (211) of the zero gas delivery component (20) delivers zero gas of a set temperature to the calibration space (13) so that the temperature of the calibration space (13) is maintained at a target temperature, and at the same time, the standard gas delivery component (30) delivers standard gas to the gas alarm A in the calibration box (10) for performing an air blowing test; After the high and low temperature test device (100) completes the air blowing test on the gas alarm A, the standard gas delivery component (30) stops delivering the standard gas to the gas alarm A in the calibration box (10); the first output end (211) of the zero gas delivery component (20) delivers zero gas at a set temperature to the calibration space (13), and the second output end (212) of the zero gas delivery component (20) delivers zero gas at a set temperature to the gas alarm A, so that the waste gas in the gas alarm A and the waste gas in the calibration space (13) are discharged from the exhaust port (14).

2. The high and low temperature test device for gas alarm according to claim 1 is characterized in that: Before the high and low temperature test device (100) performs a blowing test on the gas alarm A, the flow rate of zero gas delivered by the first output end (211) of the zero gas delivery component (20) is a first sub-flow rate V11, and the flow rate of zero gas delivered by the second output end (212) of the zero gas delivery component (20) is a second sub-flow rate V12; During the process of the high and low temperature test device (100) performing a blowing test on the gas alarm A, the flow rate of the zero gas delivered by the first output end (211) of the zero gas delivery component (20) is a second flow rate V2; After the high and low temperature test device (100) has completed the air blowing test on the gas alarm A, the flow rate of zero gas delivered by the first output end (211) of the zero gas delivery component (20) is a third sub-flow rate V31, and the flow rate of zero gas delivered by the second output end (212) of the zero gas delivery component (20) is a fourth sub-flow rate V32; Among them, V11+V12=V2=V31+V32.

3. The high and low temperature test device for gas alarm according to claim 1 is characterized in that: The high and low temperature test device (100) further comprises a control unit (90), wherein the control unit (90) is electrically connected to the zero gas delivery component (20) and the standard gas delivery component (30); Before the high and low temperature test device (100) performs a blow test on the gas alarm A, the control unit (90) controls the first output end (211) of the zero gas delivery component (20) to deliver zero gas of a set temperature to the calibration space (13) and the second output end (212) of the zero gas delivery component (20) to deliver zero gas of a set temperature to the gas alarm A, so that the calibration space (13) and the environment of the gas alarm A both reach the target temperature; After the temperature of the inspection space (13) and the temperature of the environment in which the gas alarm A is located reach the target temperature, the control unit (90) controls the first output end (211) of the zero gas delivery component (20) to deliver zero gas of a set temperature to the inspection space (13), so that the temperature of the inspection space (13) is maintained at the target temperature; at the same time, the control unit (90) controls the standard gas delivery component (30) to deliver standard gas to the gas alarm A in the inspection box (10) for performing a blow test.

4. The high and low temperature test device for gas alarm according to claim 1 is characterized in that: A gas sensor (18) is provided in the inspection box (10) for detecting the exhaust gas concentration in the inspection space (13); The high and low temperature test device (100) further comprises a control unit (90), wherein the control unit (90) is electrically connected to the zero gas delivery assembly (20), the standard gas delivery assembly (30) and the gas sensor (18); Before the high and low temperature test device (100) performs a blowing test on the gas alarm A, the control unit (90) controls the gas sensor (18) to detect the current exhaust gas concentration value of the calibration space (13); If the current exhaust gas concentration value is not higher than a preset exhaust gas concentration value, the control unit (90) controls the first output end (211) of the zero gas delivery component (20) to deliver zero gas of a set temperature to the inspection space (13), and controls the standard gas delivery component (30) to deliver standard gas to the gas alarm A, so as to perform a blow test; If the current exhaust gas concentration value is higher than the preset exhaust gas concentration value, the control unit (90) controls the first output end (211) of the zero gas delivery component (20) to deliver zero gas of a set temperature to the inspection space (13), and controls the second output end (212) of the zero gas delivery component (20) to deliver zero gas of a set temperature to the gas alarm A, so that the exhaust gas in the inspection space (13) and the exhaust gas in the gas alarm A are discharged from the exhaust port (14), and the temperature of the inspection space (13) and the ambient temperature of the gas alarm A reach the target temperature.

5. The high and low temperature test device for gas alarm according to claim 1 is characterized in that: The zero air delivery assembly (20) comprises: A zero gas delivery pipeline (21), comprising a zero gas input pipeline (21c), a first zero gas output pipeline (21a) and a second zero gas output pipeline (21b); an input end (213) of the zero gas input pipeline (21c) is used to input zero gas; an output end of the zero gas input pipeline (21c) is connected to an input end of the first zero gas output pipeline (21a) and an input end of the second zero gas output pipeline (21b); a first output end (211) of the zero gas delivery pipeline (21) is arranged at an output end of the first zero gas output pipeline (21a); ​​and a second output end (212) of the zero gas delivery pipeline (21) is arranged at an output end of the second zero gas output pipeline (21b); A first zero gas flow controller (24a), arranged on the first zero gas output pipeline (21a), the first zero gas flow controller (24a) being used to adjust the flow rate of zero gas outputted by the first zero gas output pipeline (21a); A second zero gas flow controller (24b), arranged on the second zero gas output pipeline (21b), the second zero gas flow controller (24b) being used to adjust the flow rate of zero gas outputted by the second zero gas output pipeline (21b); A zero gas temperature control unit (20a) is arranged on the zero gas input pipeline (21c), and the zero gas temperature control unit (20a) is used to adjust the temperature of the zero gas output by the zero gas delivery pipeline (21) to reach a set temperature.

6. The high and low temperature test device for gas alarm according to claim 5, characterized in that: The zero air temperature control unit (20a) comprises: A zero gas refrigerator (25), arranged on the zero gas input pipeline (21c), for cooling the zero gas flowing through the zero gas refrigerator (25); a zero gas heater (26), arranged on the zero gas input pipeline (21c) and arranged downstream of the zero gas refrigerator (25), the zero gas heater (26) being used to heat the zero gas flowing through the zero gas heater (26); During the process of the high and low temperature testing device (100) performing a low temperature test on the gas alarm A, the zero gas refrigerator (25) cools the zero gas flowing through the zero gas refrigerator (25) to a first temperature, wherein the first temperature is lower than a set temperature; and the zero gas heater (26) heats the zero gas output from the zero gas refrigerator (25) so that the zero gas transmission pipeline (21) outputs zero gas at a set temperature.

7. The high and low temperature test device for gas alarm according to claim 5, characterized in that: A calibration pressure sensor (17) is arranged in the calibration box (10); The first zero gas flow controller (24a) and the second zero gas flow controller (24b) are used to adjust the flow rate of the zero gas delivered by the zero gas delivery pipeline (21) according to the pressure value detected by the calibration pressure sensor (17), so that the pressure of the calibration space (13) is maintained within a preset pressure range; or The first zero gas flow controller (24a) is used to adjust the flow of zero gas delivered by the first zero gas output pipeline (21a) according to the pressure value detected by the calibration pressure sensor (17), so that the pressure of the calibration space (13) is maintained within a preset pressure range.

8. The high and low temperature test device for gas alarm according to claim 5, characterized in that: The standard gas delivery assembly (30) comprises a temperature control box (31) for controlling the temperature of the standard gas; The high and low temperature test device (100) further comprises a coil (70) arranged in the temperature control box (31); the coil (70) is also arranged on the zero gas input pipeline (21c) and is located upstream of the zero gas temperature control unit (20a); the coil (70) is capable of performing heat exchange with the temperature control box (31) to preheat or precool the zero gas flowing through the coil (70).

9. The high and low temperature test device for gas alarm according to claim 5, characterized in that: The zero gas delivery assembly (20) further comprises: a first zero gas temperature sensor (29), which is arranged at the first output end (211) of the first zero gas output pipeline (21a) and is used to detect the temperature of the zero gas outputted from the first output end (211) of the first zero gas output pipeline (21a); The zero gas temperature control unit (20a) is used to adjust the temperature of the zero gas flowing through the zero gas temperature control unit (20a) according to the temperature value detected by the first zero gas temperature sensor (29), so that the zero gas outputted from the first output end (211) of the first zero gas output pipeline (21a) reaches a set temperature.

10. The high and low temperature test device for gas alarm according to claim 5, characterized in that: The zero air delivery assembly (20) further comprises: A first zero gas temperature sensor (29) is arranged at the first output end (211) of the first zero gas output pipeline (21a) and is used to detect the temperature of the zero gas outputted from the first output end (211) of the first zero gas output pipeline (21a); A calibration temperature sensor (16) is arranged in the calibration box (10), and the calibration temperature sensor (16) is used to detect the temperature of the calibration space (13); The zero gas temperature control unit (20a) is used to adjust the temperature of the zero gas flowing through the zero gas temperature control unit (20a) according to the temperature value detected by the verification temperature sensor (16) and the temperature value detected by the first zero gas temperature sensor (29).

11. The high and low temperature test device for gas alarm according to claim 10, characterized in that: The high and low temperature test device (100) further comprises a control unit (90), wherein the control unit (90) is electrically connected to the zero gas temperature control unit (20a), the first zero gas temperature sensor (29), the verification temperature sensor (16), and the standard gas delivery assembly (30); When the temperature value detected by the first zero-gas temperature sensor (29) reaches a set temperature and the temperature value detected by the verification temperature sensor (16) reaches a target temperature, the control unit (90) controls the zero-gas temperature control unit (20a) to maintain a current heating amount so that the temperature value detected by the verification temperature sensor (16) remains at the target temperature; When the temperature value detected by the first zero-gas temperature sensor (29) reaches a set temperature and the temperature value detected by the verification temperature sensor (16) is lower than a target temperature, the control unit (90) controls the zero-gas temperature control unit (20a) to increase the heating amount so that the temperature value detected by the verification temperature sensor (16) reaches the target temperature; When the temperature value detected by the first zero-gas temperature sensor (29) reaches a set temperature and the temperature value detected by the verification temperature sensor (16) is higher than a target temperature, the control unit (90) controls the zero-gas temperature control unit (20a) to reduce the heating amount or stop heating so that the temperature value detected by the verification temperature sensor (16) reaches the target temperature.

12. The high and low temperature test device for gas alarm according to claim 5, characterized in that: A calibration temperature sensor (16) is arranged in the calibration box (10), and the calibration temperature sensor (16) is used to detect the temperature of the calibration space (13); The zero air temperature control unit (20a) is used to adjust the temperature of the zero air flowing through the zero air temperature control unit (20a) according to the temperature value detected by the calibration temperature sensor (16), so that the temperature of the calibration space (13) reaches the target temperature.

13. The high and low temperature test device for gas alarm according to any one of claims 1-7 and 9-12, characterized in that: The standard gas delivery assembly (30) comprises: A temperature control box (31), a standard gas tank (32), a standard gas control valve (33), a standard gas flow controller (34), and a standard gas temperature control unit (30a), wherein the standard gas tank (32), the standard gas control valve (33), and the standard gas flow controller (34) are all arranged in the temperature control box (31); The standard gas tank (32) is connected to the input end of the standard gas flow controller (34) through the standard gas control valve (33), and the output end of the standard gas flow controller (34) is connected to the gas alarm A in the calibration box (10); The standard gas tank (32) is used to contain standard gas; The standard gas control valve (33) is used to control the opening and closing of the standard gas and to reduce the pressure of the standard gas; The standard gas flow controller (34) is used to adjust the flow rate of the standard gas; The standard gas temperature control unit (30a) is used to adjust the temperature in the temperature control box (31) to a desired temperature.

14. The high and low temperature test device for gas alarm according to claim 13, characterized in that: The standard gas delivery assembly (30) further comprises: a first standard gas temperature sensor (37) disposed in the temperature control box (31) and used to detect the temperature in the temperature control box (31); the standard gas temperature control unit (30a) is used to adjust the temperature in the temperature control box (31) to a desired temperature according to the temperature value detected by the first standard gas temperature sensor (37); or The standard gas delivery component (30) further comprises: a second standard gas temperature sensor (39) disposed at the output end (302) of the standard gas delivery component (30) and used to detect the temperature of the standard gas outputted from the output end (302) of the standard gas delivery component (30); the standard gas temperature control unit (30a) is used to adjust the temperature of the standard gas outputted from the output end (302) of the standard gas delivery component (30) to a target temperature according to the temperature value detected by the second standard gas temperature sensor (39); or The standard gas delivery component (30) further comprises a first standard gas temperature sensor (37) and a second standard gas temperature sensor (39); the first standard gas temperature sensor (37) is arranged in the temperature control box (31), and the first standard gas temperature sensor (37) is used to detect the temperature in the temperature control box (31); the second standard gas temperature sensor (39) is arranged at the output end (302) of the standard gas delivery component (30), and the second standard gas temperature sensor (39) is used to detect the temperature of the standard gas output from the output end (302) of the standard gas delivery component (30); the standard gas temperature control unit (30a) is used to adjust the temperature of the standard gas output from the output end (302) of the standard gas delivery component (30) to a target temperature according to the temperature value detected by the first standard gas temperature sensor (37) and the temperature value detected by the second standard gas temperature sensor (39).

Images