A temperature compensation device and a temperature compensation method for a gas concentration measuring device

Abstract

The present invention discloses a temperature compensation device for a gas concentration measuring device, including a temperature and humidity chamber, a sealed box is arranged in the temperature and humidity chamber, the sealed box is connected to the outside of the temperature and humidity chamber through a pipe group, and operating gloves, an air bag, a thermometer and a standard gas concentration measuring device are arranged in the sealed box respectively. The present invention provides a test environment with adjustable temperature and adjustable gas concentration, detects the indication of the gas concentration measuring device in the test environment, and provides a measurement environment for finding the relationship between temperature, gas concentration and the indication of the gas concentration measuring device. The present invention also discloses a temperature compensation method for a gas concentration measuring device, including installation, ventilation, changing the target temperature, changing the concentration of the gas to be measured, obtaining the relationship between the gas concentration and the output value of the device at different temperatures, and then obtaining the temperature compensation of the gas concentration measuring device, and finally exhausting. The present invention has accurate temperature compensation, short operation time and wide application value.

Description

Technical Field

[0001] The invention belongs to the technical field of explosion-proof safety, and in particular relates to a temperature compensation device for gas concentration measuring equipment, and also relates to a temperature compensation method for gas concentration measuring equipment. Background Art

[0002] Gas concentration measuring equipment such as gas detectors and gas sensors are affected by the surrounding temperature when detecting gas concentration.

[0003] Existing gas concentration measurement equipment is based on the temperature response curve of the gas detection head in the gas concentration measurement equipment. This relationship curve is provided by the probe manufacturer and temperature compensation is completed using an algorithm.

[0004] The above method has two shortcomings: first, the gas detection head is not consistent. Each gas detection head has its own characteristics. The manufacturer guarantees that the probes it produces meet the relevant indicators within a certain range (that is, the response curves of each probe form a cluster of curves, and the actual response value of a single probe is within this range); second, the output value of the gas detection head will pass through the post-stage signal processing circuit. The post-stage processing circuit of the gas concentration measurement equipment will be inconsistent and affected by temperature, such as the analog-to-digital conversion circuit, the amplification circuit, etc. Summary of the invention

[0005] The purpose of the present invention is to provide a temperature compensation device for a gas concentration measuring device, which provides a measurement environment for finding the relationship between temperature, measured gas concentration and the indication of the gas concentration measuring device, thereby facilitating the temperature compensation of the gas concentration measuring device.

[0006] Another object of the present invention is to provide a temperature compensation method for a gas concentration measuring device, thereby improving the accuracy of temperature compensation.

[0007] The first technical solution adopted by the present invention is a temperature compensation device for a gas concentration measuring device, including a temperature and humidity chamber, in which a closed box is arranged, and the closed box is connected to the outside of the temperature and humidity chamber through a pipe group, and the closed box is respectively provided with operating gloves, an air bag, a thermometer and a standard gas concentration meter.

[0008] The first technical solution of the present invention is also characterized in that:

[0009] An operating opening is provided on the top of the airtight box, and the outer edge of the cuff of the operating glove is sealed and connected to the operating opening.

[0010] The pipe fitting group includes a gas flow meter located outside the temperature and humidity chamber, the input port and the output port of the gas flow meter are respectively connected with an air intake rubber tube and an air delivery rubber tube, the air intake end of the air intake rubber tube is provided with a Y-type three-way switch, the air delivery rubber tube extends into the temperature and humidity chamber and is sequentially connected with a coil and a closed box air intake rubber tube, the coil and the closed box air intake rubber tube are respectively located outside and inside the closed box, and the coil and the closed box air intake pipe are connected through a pagoda joint a provided on the closed box;

[0011] It also includes an exhaust pipe composed of a rubber tube a, a polytetrafluoroethylene tube and a rubber tube b connected in sequence, the rubber tube a is connected to the closed box, a pagoda joint b is provided at the connection between the rubber tube a and the closed box, the polytetrafluoroethylene tube is located inside the temperature and humidity box and outside the closed box, the rubber tube b is connected to the polytetrafluoroethylene tube and extends out of the temperature and humidity box, and a straight-through switch is provided at one end of the rubber tube b located outside the temperature and humidity box.

[0012] The wall of the temperature and humidity chamber is inlaid with a rubber plug, and the gas transmission rubber tube and the rubber tube b both pass through the rubber plug.

[0013] The airbag has an inflation port and an air outlet, and the maximum volume of the airbag is two-thirds of the volume of the closed box.

[0014] The second technical solution adopted by the present invention is a temperature compensation method for a gas concentration measuring device, which uses the temperature compensation device of the gas concentration measuring device of the first technical solution of the present invention to perform temperature compensation, and is specifically implemented according to the following steps:

[0015] Step 1: Place the gas concentration measuring device to be temperature compensated in a closed box, connect the Y-type three-way switch to the measured gas and the protective gas respectively, and connect the through switch to the laboratory gas processing device;

[0016] Step 2, open the straight switch, adjust the Y-type three-way switch to introduce the measured gas, turn off the protective gas, use operating gloves to connect the air intake rubber tube of the closed box to the standard gas concentration meter to measure the concentration of the measured gas, and record the reading of the standard gas concentration meter after it stabilizes. The reading is the concentration of the measured gas, and disconnect the air intake rubber tube of the closed box and the standard gas concentration meter;

[0017] Step 3, insert the air inlet rubber tube of the airtight box into the inflation port of the airbag, and block the air outlet of the airbag. After the airbag is filled, open its air outlet, pull out the air inlet rubber tube of the airtight box, manually discharge the gas in the airbag, and fill the airbag with the measured gas through the air inlet rubber tube of the airtight box again. Repeat the charging and discharging cycle several times until the reading of the standard gas concentration measuring instrument reaches 99% or above of the measured gas concentration value, and other gases in the airtight box are discharged;

[0018] Step 4. Close the door of the temperature and humidity box, adjust the temperature of the temperature and humidity box to the target temperature, and when the temperature in the sealed box is consistent with the target temperature, record the indication of the gas concentration measuring device to be temperature compensated, set different target temperatures, repeat the operation, and record the indications corresponding to different target temperatures;

[0019] Step 5, changing the concentration of the measured gas, repeating the operations of step 2 to step 4, and sorting out the relationship between the measured gas concentration, temperature, and the gas concentration measuring device indication according to the indication corresponding to different target temperatures when measuring the measured gas concentration of each concentration. Through these three relationships, the temperature compensation value of the gas concentration measured by the gas concentration measuring device to be temperature compensated under various temperature conditions is obtained;

[0020] Step 6. Adjust the Y-type three-way switch, turn off the measured gas, introduce the protective gas, adjust the temperature of the temperature and humidity chamber to room temperature, wait for the thermometer to reach room temperature, open the temperature and humidity chamber, and when the measured gas concentration of the standard gas concentration meter shows 0%, turn off the protective gas and close the through switch.

[0021] The second technical solution of the present invention is also characterized in that:

[0022] In step 3, the continuous inflation and deflation of the airbag is recorded as one time, and the number of times the airbag is inflated and deflated is 6 times or more.

[0023] In step 2, the gas flow rate of the gas to be measured is 200mL / min, and in step 3, the gas flow rate of the gas to be measured is 8-10L / min. After other gases in the closed box are discharged and the gas to be measured is filled in step 3, the gas to be measured continues to be ventilated at a flow rate of 20-80mL / min to maintain the concentration in the closed box during the measurement process.

[0024] The method of introducing protective gas and exhausting the measured gas in step 6 is the same as the method of using an air bag to exhaust other gases in the closed box in step 3, that is, the air bag is filled with protective gas and then released. After multiple filling and deflation, all the measured gas is exhausted, and the measured gas concentration reading of the standard gas concentration meter is 0%.

[0025] The protective gas is nitrogen, and the flow rate of the protective gas is 8-10L / min.

[0026] The beneficial effects of the present invention are:

[0027] The invention discloses a temperature compensation device for gas concentration measuring equipment, which is mainly aimed at gas concentration measuring equipment such as thermal catalytic type and electrochemical type that are sensitive to temperature. The airbag is provided to increase the exhaust speed of the closed box, so that the temperature compensation of the gas concentration measuring equipment can be obtained more quickly. The relationship between the temperature, concentration and output value provided is more accurate, which is more extensive than the existing probe temperature characteristic curve provided by the manufacturer, and further improves the accuracy of the gas concentration measuring equipment.

[0028] The invention discloses a temperature compensation method for a gas concentration measuring device, which is clear and has strong operability. After discharging the original gas in a closed box, the values ​​of the input gas concentration, the test temperature and the output value of the gas concentration measuring device in the measurement process are recorded to obtain the relationship between the gas concentration and the device output value at different temperatures, and then obtain the temperature compensation of the gas concentration measuring device. The temperature compensation includes the influence of inconsistency existing in the post-processing circuit of the gas concentration measuring device and the influence of temperature on the compensation process. The method has accurate temperature compensation, short operation time and wide application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a temperature compensation device of a gas concentration measuring device of the present invention;

[0030] Figure 2 It is a volume distribution diagram in the closed box when the airbag starts to inflate;

[0031] Figure 3 A volume distribution diagram in the closed box when the airbag is inflated to its maximum volume;

[0032] Figure 4 Flow chart for detecting gas concentration for gas concentration measurement equipment.

[0033] In the figure, 1. Y-type three-way switch, 2. air intake rubber tube of closed box, 3. gas flow meter, 4. gas transmission rubber tube, 5. coil, 6. pagoda connector a, 7. air intake pipe of closed box, 8. air bag, 9. thermometer, 10. gas concentration measuring equipment to be temperature compensated, 11. operating gloves, 12. standard gas concentration measuring device, 13. pagoda connector b, 14. rubber tube a, 15. closed box, 16. polytetrafluoroethylene tube, 17. rubber tube b, 18. temperature and humidity chamber, 19. rubber plug, 20. straight-through switch. DETAILED DESCRIPTION

[0034] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] The present invention provides a temperature compensation device for a gas concentration measuring device, such as Figure 1As shown, it includes a temperature and humidity box 18, in which a sealed box 15 is arranged. The sealed box 15 is connected to the outside of the temperature and humidity box 18 through a pipe group. The sealed box 15 is respectively provided with operating gloves 11, an airbag 8, a thermometer 9 and a standard gas concentration meter 12. The airbag 8 has an inflation port and an air outlet. The maximum volume of the airbag 8 is two-thirds of the volume of the sealed box 15. An operating port is opened on the top of the sealed box 15, and the outer edge of the cuff of the operating glove 11 is sealed and connected to the operating port.

[0036] The pipe fitting group includes a gas flow meter 3 located outside the temperature and humidity box 18, the input port and the output port of the gas flow meter 3 are respectively connected to the air intake rubber tube 2 and the air delivery rubber tube 4, the air intake end of the air intake rubber tube 2 is provided with a Y-type three-way switch 1, the air delivery rubber tube 4 extends into the temperature and humidity box 18 and is sequentially connected to a coil 5 and a closed box air intake rubber tube 7, the coil 5 and the closed box air intake rubber tube 7 are respectively located outside and inside the closed box 15, and the coil 5 and the closed box air intake pipe 7 are connected through a pagoda joint a6 provided on the closed box 15;

[0037] It also includes an exhaust pipe composed of a rubber tube a14, a polytetrafluoroethylene tube 16 and a rubber tube b17 connected in sequence. The rubber tube a14 is connected to the sealed box 15. A pagoda joint b13 is provided at the connection between the rubber tube a14 and the sealed box 15. The polytetrafluoroethylene tube 16 is located inside the temperature and humidity box 18 and outside the sealed box 15. The rubber tube b17 is connected to the polytetrafluoroethylene tube 16 and extends out of the temperature and humidity box 18. A straight-through switch 20 is provided at one end of the rubber tube b17 located outside the temperature and humidity box 18. A rubber plug 19 is inlaid on the wall of the temperature and humidity box 18. The gas transmission rubber tube 4 and the rubber tube b17 both pass through the rubber plug 19.

[0038] The main components of the temperature compensation device of a gas concentration measuring device of the present invention have the following specific functions:

[0039] The temperature and humidity box 18 is used to maintain the target temperature and provide a stable temperature environment for the sealed box 15 . The gas in the sealed box 15 exchanges heat with the inside of the temperature and humidity box 18 .

[0040] The coil 5 increases the heat exchange area and improves the heat exchange rate, so that the measured gas has undergone a heat exchange when entering the closed box 15, reducing the temperature difference between the measured gas inside the closed box 15 and the outside of the closed box 15.

[0041] The airbag 8 accelerates the entire ventilation stabilization process, so that the concentration of the gas to be measured in the closed box 15 quickly and infinitely approaches the concentration of the gas to be measured itself.

[0042] The present invention provides a temperature compensation method for a gas concentration measuring device, which uses a temperature compensation device for a gas concentration measuring device of the present invention to perform temperature compensation, and is specifically implemented according to the following steps:

[0043] Step 1: Place the gas concentration measuring device 10 to be temperature compensated into a closed box 15, connect the Y-type three-way switch 1 to the measured gas and the protective gas respectively, and connect the through switch 20 to the laboratory gas processing device;

[0044] Step 2, open the through switch 20, adjust the Y-type three-way switch 1 to introduce the measured gas at a gas flow rate of 200mL / min, turn off the protective gas, use the operating gloves 11 to connect the airtight box air intake rubber tube 7 with the standard gas concentration meter 12 to measure the measured gas concentration value, and record the reading of the standard gas concentration meter 12 after it stabilizes. The reading is the measured gas concentration value, and disconnect the airtight box air intake rubber tube 7 and the standard gas concentration meter 12;

[0045] Step 3, extend the airtight box air inlet rubber tube 7 into the inflation port of the airbag 8, and block the air outlet of the airbag 8, the gas flow rate of the measured gas filled into the airbag 8 is 8-10L / min, after the airbag 8 is full, open its air outlet, pull out the airtight box air inlet rubber tube 7, manually discharge the gas in the airbag 8, and fill the measured gas into the airbag 8 through the airtight box air inlet rubber tube 7 again, and repeat the charging and discharging cycle for many times until the reading of the standard gas concentration measuring instrument 12 reaches 99% or more of the measured gas concentration value, and the other gases in the closed box 15 are discharged, and continue to ventilate the measured gas at a flow rate of 20-80mL / min, and maintain the concentration in the closed box 15 during the measurement process;

[0046] Step 4, close the door of the temperature and humidity box 18, adjust the temperature of the temperature and humidity box 18 to the target temperature, when the temperature in the closed box 15 is consistent with the target temperature, record the indication of the gas concentration measuring device 10 to be temperature compensated, set different target temperatures, repeat the operation, and record the indications corresponding to different target temperatures;

[0047] Step 5, changing the concentration of the measured gas, repeating the operations of step 2 to step 4, and sorting out the relationship between the measured gas concentration, temperature, and the indication of the gas concentration measuring device 10 according to the indication corresponding to different target temperatures when measuring the concentration of the measured gas at each concentration. Through these three relationships, the temperature compensation value of the gas concentration measured by the gas concentration measuring device 10 to be temperature compensated under various temperature conditions is obtained;

[0048] Step 6, adjust the Y-type three-way switch 1, close the gas to be measured, introduce protective gas nitrogen, the flow rate of nitrogen filling is 8-10L / min, adjust the temperature of the temperature and humidity box 18 to room temperature, wait until the thermometer 9 reading reaches room temperature, open the temperature and humidity box 18, fill the air bag 8 with nitrogen and then release it, and discharge all the gas to be measured after multiple filling and deflation. When the concentration of the gas to be measured of the standard gas concentration measuring instrument 12 shows 0%, turn off the nitrogen and close the through switch 20.

[0049] In step 3, the continuous inflation and deflation of the airbag 8 is counted as one time, and the number of times of inflation and deflation of the airbag 8 is 6 times or more. During the gas filling process, the gas in the closed box 15 needs to be mixed in the box, and the natural mixing time is long. Therefore, the present invention accelerates the entire ventilation stabilization process by inflating and deflation of the airbag.

[0050] The calculation using the airbag 8 exhaust method is as follows: Assume that the volume of the closed box 15 is V, the volume of the airbag 8 is V1, and the volume outside the airbag 8 in the closed box 15 is V2. Figure 2 As shown, during ventilation, the measured gas concentration is first introduced into the airbag 8, and the measured gas is stored in the airbag 8. At this time, V2 decreases and V1 increases, V=V1+V2; Figure 3 As shown, when the airbag 8 is full, it is exactly the maximum volume V3 of the airbag 8, and the volume outside the airbag 8 in the closed box 15 is V4. At this time, the volume of the closed box 15 is V=V3+V4, and the volume outside the airbag 8 in the closed box 15 changes from V2 to V4, the volume decreases, and the gas is discharged; stop inflating the airbag 8, and manually squeeze out the gas inside the airbag 8. At this time, the volume outside the airbag 8 in the closed box 15 increases, and the increased volume is the volume of the gas discharged from the airbag 8. At this time, the gas concentration outside the airbag 8 in the closed box 15 changes, and the concentration of the measured gas increases; continue to ventilate and deflate the airbag 8, and repeat this many times, so that the V2 gas concentration in the closed box 15 can gradually approach or even reach the concentration of the measured gas itself.

[0051] The concentration of the gas measured outside the airbag 8 in the sealed box 15 is calculated as follows: the volume of the box is V, the volume of the airbag 8 is 1 / t·V, t is a natural number not equal to 0, the concentration of the gas measured is c%, the number of times the airbag 8 is ventilated is n (n>0, an integer), and after the nth ventilation, the concentration of the gas measured outside the airbag 8 in the sealed box 15 is y(n), and the relationship formula is:

[0052]

[0053] When the volume of the sealed box 15 is 1 / 2 of the maximum volume of the airbag 8, the gas concentration in the box is 0.5·c% after the first ventilation; the gas concentration in the box is 0.937·c% after the fourth ventilation; the gas concentration in the box is 0.996·c% after the eighth ventilation; and the gas concentration in the box is 0.999·c% after the tenth ventilation.

[0054] When the volume of the airbag 8 is taken as 2 / 3 of the box volume, the gas concentration in the sealed box 15 after the first ventilation is 0.6666·c%; the gas concentration in the box after the fourth ventilation is 0.9876·c%; the gas concentration in the box after the sixth ventilation is 0.9986·c%; and the gas concentration in the box after the seventh ventilation is 0.9995·c%.

[0055] Through the above comparison, it can be found that the airbag 8 used is 2 / 3 of the volume of the closed box 15, and it is ventilated 6 times. The closed box 15 is exhausted smoothly and quickly, and the gas concentration in the closed box 15 reaches 0.9986·c%.

[0056] The gas concentration measuring device includes a gas detection head, an analog signal processing module, a digital signal processing module, a concentration mapping module, a temperature compensation module and an output module. The measurement process of the gas concentration measuring device passes through the gas detection head, the analog signal processing module, the digital signal processing module, the concentration mapping module, the temperature compensation module, and then outputs. The process of the gas concentration measuring device detecting the gas concentration is as follows Figure 4 As shown, the gas detection head detects the gas to be measured and outputs a weak electrical signal; the analog signal processing module processes and amplifies the weak electrical signal and converts it into a digital signal; the digital signal processing module performs digital filtering on the obtained digital signal; the concentration mapping module converts the filtered digital signal into a corresponding gas concentration signal; the temperature compensation module processes the gas concentration signal to reduce the temperature effect. The use of the temperature compensation data in the present invention can simultaneously reduce the temperature effect on the probe and the temperature effect on the analog signal processing part. The concentration signal can be used for signal display, communication and other purposes of the gas concentration measuring device. A temperature compensation method for a gas concentration measuring device of the present invention records the values ​​of the input gas concentration, the test temperature, and the output value of the gas concentration measuring device during the measurement process, wherein the output value of the gas concentration measuring device generally refers to the display value or the digital signal value. The relationship between the three is used to obtain the compensation of the gas concentration measuring device, and the compensation includes compensation for the effect of temperature on the gas detection head and the signal processing module, thereby improving the measurement accuracy of the gas concentration measuring device.

[0057] Example 1

[0058] This embodiment provides a temperature compensation method for a gas concentration measurement device, which uses the temperature compensation device for a gas concentration measurement device of the present invention to perform temperature compensation, and is specifically implemented according to the following steps:

[0059] Step 1: Place the gas concentration measuring device 10 to be temperature compensated into a closed box 15, connect the Y-type three-way switch 1 to the measured gas and the protective gas respectively, and connect the through switch 20 to the laboratory gas processing device;

[0060] Step 2, open the through switch 20, adjust the Y-type three-way switch 1 to introduce the measured gas at a gas flow rate of 200mL / min, turn off the protective gas, use the operating gloves 11 to connect the airtight box air intake rubber tube 7 with the standard gas concentration meter 12 to measure the measured gas concentration value, and record the reading of the standard gas concentration meter 12 after it stabilizes. The reading is the measured gas concentration value, and disconnect the airtight box air intake rubber tube 7 and the standard gas concentration meter 12;

[0061] Step 3, extend the airtight box air inlet rubber tube 7 into the inflation port of the airbag 8, and block the air outlet of the airbag 8, the gas flow rate of the measured gas filled into the airbag 8 is 8L / min, after the airbag 8 is full, open its air outlet, pull out the airtight box air inlet rubber tube 7, manually discharge the gas in the airbag 8, and fill the measured gas into the airbag 8 through the airtight box air inlet rubber tube 7 again, and repeat the inflation and deflation cycle for many times, and record the continuous inflation and deflation of the airbag 8 as one time, and the number of inflation and deflation of the airbag 8 is 6 times, the reading of the standard gas concentration measuring instrument 12 reaches 99% of the measured gas concentration value, and the other gases in the closed box 15 are discharged, and the measured gas is continued to be ventilated at a flow rate of 20mL / min, and the concentration in the closed box 15 is maintained during the measurement process;

[0062] Step 4, close the door of the temperature and humidity box 18, adjust the temperature of the temperature and humidity box 18 to the target temperature, when the temperature in the closed box 15 is consistent with the target temperature, record the indication of the gas concentration measuring device 10 to be temperature compensated, set different target temperatures, repeat the operation, and record the indications corresponding to different target temperatures;

[0063] Step 5, changing the concentration of the measured gas, repeating the operations of step 2 to step 4, and sorting out the relationship between the measured gas concentration, temperature, and the indication of the gas concentration measuring device 10 according to the indication corresponding to different target temperatures when measuring the concentration of the measured gas at each concentration. Through these three relationships, the temperature compensation value of the gas concentration measured by the gas concentration measuring device 10 to be temperature compensated under various temperature conditions is obtained;

[0064] Step 6, adjust the Y-type three-way switch 1, close the gas to be measured, introduce protective gas nitrogen, the flow rate of nitrogen filling is 8L / min, adjust the temperature of the temperature and humidity box 18 to room temperature, wait until the thermometer 9 reading reaches room temperature, open the temperature and humidity box 18, fill the air bag 8 with nitrogen and then release it, and discharge all the gas to be measured after 7 times of filling and deflation. When the concentration of the gas to be measured of the standard gas concentration measuring instrument 12 shows 0%, turn off the nitrogen and close the through switch 20.

[0065] Example 2

[0066] This embodiment provides a temperature compensation method for a gas concentration measurement device, which uses the temperature compensation device for a gas concentration measurement device of the present invention to perform temperature compensation, and is specifically implemented according to the following steps:

[0067] Step 1: Place the gas concentration measuring device 10 to be temperature compensated into a closed box 15, connect the Y-type three-way switch 1 to the measured gas and the protective gas respectively, and connect the through switch 20 to the laboratory gas processing device;

[0068] Step 2, open the through switch 20, adjust the Y-type three-way switch 1 to introduce the measured gas at a gas flow rate of 200mL / min, turn off the protective gas, use the operating gloves 11 to connect the airtight box air intake rubber tube 7 with the standard gas concentration meter 12 to measure the measured gas concentration value, and record the reading of the standard gas concentration meter 12 after it stabilizes. The reading is the measured gas concentration value, and disconnect the airtight box air intake rubber tube 7 and the standard gas concentration meter 12;

[0069] Step 3, extend the airtight box air inlet rubber tube 7 into the inflation port of the airbag 8, and block the air outlet of the airbag 8, the gas flow rate of the measured gas filled into the airbag 8 is 10L / min, after the airbag 8 is full, open its air outlet, pull out the airtight box air inlet rubber tube 7, manually discharge the gas in the airbag 8, and fill the measured gas into the airbag 8 through the airtight box air inlet rubber tube 7 again, so that multiple cycles of inflation and deflation are repeated, and the continuous inflation and deflation of the airbag 8 is recorded as one time, and the number of inflation and deflation of the airbag 8 is 7 times, the reading of the standard gas concentration measuring instrument 12 reaches more than 99% of the concentration value of the measured gas, and the other gases in the sealed box 15 are discharged, and the measured gas is continued to be ventilated at a flow rate of 80mL / min, and the concentration in the sealed box 15 is maintained during the measurement process;

[0070] Step 4, close the door of the temperature and humidity box 18, adjust the temperature of the temperature and humidity box 18 to the target temperature, when the temperature in the closed box 15 is consistent with the target temperature, record the indication of the gas concentration measuring device 10 to be temperature compensated, set different target temperatures, repeat the operation, and record the indications corresponding to different target temperatures;

[0071] Step 5, changing the concentration of the measured gas, repeating the operations of step 2 to step 4, and sorting out the relationship between the measured gas concentration, temperature, and the indication of the gas concentration measuring device 10 according to the indication corresponding to different target temperatures when measuring the concentration of the measured gas at each concentration. Through these three relationships, the temperature compensation value of the gas concentration measured by the gas concentration measuring device 10 to be temperature compensated under various temperature conditions is obtained;

[0072] Step 6, adjust the Y-type three-way switch 1, close the gas to be measured, introduce protective gas nitrogen, the flow rate of nitrogen filling is 10L / min, adjust the temperature of the temperature and humidity box 18 to room temperature, wait until the thermometer 9 reading reaches room temperature, open the temperature and humidity box 18, fill the air bag 8 with nitrogen and then release it, and discharge all the gas to be measured after 8 times of filling and deflation. When the concentration of the gas to be measured of the standard gas concentration measuring instrument 12 shows 0%, turn off the nitrogen and close the through switch 20.

[0073] Example 3

[0074] This embodiment provides a temperature compensation method for a gas concentration measurement device, which uses the temperature compensation device for a gas concentration measurement device of the present invention to perform temperature compensation, and is specifically implemented according to the following steps:

[0075] Step 1: Place the gas concentration measuring device 10 to be temperature compensated into a closed box 15, connect the Y-type three-way switch 1 to the measured gas and the protective gas respectively, and connect the through switch 20 to the laboratory gas processing device;

[0076] Step 2, open the through switch 20, adjust the Y-type three-way switch 1 to introduce the measured gas at a gas flow rate of 200mL / min, turn off the protective gas, use the operating gloves 11 to connect the airtight box air intake rubber tube 7 with the standard gas concentration meter 12 to measure the measured gas concentration value, and record the reading of the standard gas concentration meter 12 after it stabilizes. The reading is the measured gas concentration value, and disconnect the airtight box air intake rubber tube 7 and the standard gas concentration meter 12;

[0077] Step 3, extend the airtight box air inlet rubber tube 7 into the inflation port of the airbag 8, and block the air outlet of the airbag 8, the gas flow rate of the measured gas filled into the airbag 8 is 9L / min, after the airbag 8 is full, open its air outlet, pull out the airtight box air inlet rubber tube 7, manually discharge the gas in the airbag 8, and fill the measured gas into the airbag 8 through the airtight box air inlet rubber tube 7 again, and repeat the inflation and deflation cycle for many times, and record the continuous inflation and deflation of the airbag 8 as one time, and the number of inflation and deflation of the airbag 8 is 8 times, the reading of the standard gas concentration measuring instrument 12 reaches more than 99% of the concentration value of the measured gas, and the other gases in the sealed box 15 are discharged, and the measured gas is continued to be ventilated at a flow rate of 50mL / min, and the concentration in the sealed box 15 is maintained during the measurement process;

[0078] Step 4, close the door of the temperature and humidity box 18, adjust the temperature of the temperature and humidity box 18 to the target temperature, when the temperature in the closed box 15 is consistent with the target temperature, record the indication of the gas concentration measuring device 10 to be temperature compensated, set different target temperatures, repeat the operation, and record the indications corresponding to different target temperatures;

[0079] Step 5, changing the concentration of the measured gas, repeating the operations of step 2 to step 4, and sorting out the relationship between the measured gas concentration, temperature, and the indication of the gas concentration measuring device 10 according to the indication corresponding to different target temperatures when measuring the concentration of the measured gas at each concentration. Through these three relationships, the temperature compensation value of the gas concentration measured by the gas concentration measuring device 10 to be temperature compensated under various temperature conditions is obtained;

[0080] Step 6, adjust the Y-type three-way switch 1, close the gas to be measured, introduce protective gas nitrogen, the flow rate of nitrogen filling is 9L / min, adjust the temperature of the temperature and humidity box 18 to room temperature, wait until the thermometer 9 reading reaches room temperature, open the temperature and humidity box 18, fill the air bag 8 with nitrogen and then release it, and discharge all the gas to be measured after 9 times of filling and deflation. When the concentration of the gas to be measured of the standard gas concentration measuring instrument 12 shows 0%, turn off the nitrogen and close the through switch 20.

Claims

1. A temperature compensation device for a gas concentration measuring device, characterized in that: The invention comprises a temperature and humidity box (18), wherein a sealed box (15) is arranged in the temperature and humidity box (18), wherein the sealed box (15) is connected to the outside of the temperature and humidity box (18) through a pipe assembly, wherein an operating glove (11), an air bag (8), a thermometer (9) and a standard gas concentration measuring device (12) are arranged in the sealed box (15), wherein the air bag (8) has an inflation port and an air outlet, wherein the maximum volume of the air bag (8) is two-thirds of the volume of the sealed box (15), wherein an operating port is provided at the top of the sealed box (15), and the outer edge of the cuff of the operating glove (11) is sealedly connected to the operating port; The pipe assembly comprises a gas flow meter (3) located outside the temperature and humidity chamber (18); the input port and the output port of the gas flow meter (3) are respectively connected to an air intake rubber tube and an air delivery rubber tube (4); the air intake end of the air intake rubber tube is provided with a Y-shaped three-way switch (1); the air delivery rubber tube (4) extends into the temperature and humidity chamber (18) and is sequentially connected to a coil (5) and an air intake rubber tube (2) of a closed box (15); the coil (5) and the air intake rubber tube (2) of the closed box (15) are respectively located outside and inside the closed box (15); the coil (5) and the air intake pipe (7) of the closed box (15) are connected via a pagoda joint a (6) provided on the closed box (15); It also includes an exhaust pipe formed by connecting a rubber tube a (14), a polytetrafluoroethylene tube (16) and a rubber tube b (17) in sequence, wherein the rubber tube a (14) is connected to the sealed box (15), and a pagoda joint b (13) is provided at the connection between the rubber tube a (14) and the sealed box (15), the polytetrafluoroethylene tube (16) is located inside the temperature and humidity box (18) and outside the sealed box (15), the rubber tube b (17) is connected to the polytetrafluoroethylene tube (16) and extends out of the temperature and humidity box (18), and a through switch (20) is provided at one end of the rubber tube b (17) located outside the temperature and humidity box (18).

2. A temperature compensation device for a gas concentration measuring device according to claim 1, characterized in that: The temperature and humidity chamber (18) has a wall inlaid with a rubber plug (19), and the gas transmission rubber tube (4) and the rubber tube b (17) both pass through the rubber plug (19).

3. A temperature compensation method for a gas concentration measuring device, using the temperature compensation device for a gas concentration measuring device according to any one of claims 1 to 2 to perform temperature compensation, specifically implemented according to the following steps: Step 1, placing the gas concentration measuring device (10) to be temperature compensated into a sealed box (15), connecting the Y-type three-way switch (1) to the measured gas and the protective gas respectively, and connecting the through switch (20) to the laboratory gas processing device; Step 2, open the through switch (20), adjust the Y-type three-way switch (1) to introduce the measured gas, turn off the protective gas, use the operating gloves (11) to connect the air intake rubber tube (2) of the closed box (15) to the standard gas concentration measuring device (12) to measure the concentration value of the measured gas, record the reading of the standard gas concentration measuring device (12) after it stabilizes, and the reading is the concentration value of the measured gas, and disconnect the air intake rubber tube (2) of the closed box (15) and the standard gas concentration measuring device (12); Step 3, insert the air inlet rubber tube (2) of the sealed box (15) into the inflation port of the airbag (8), and block the air outlet of the airbag (8). After the airbag (8) is filled, open its air outlet, pull out the air inlet rubber tube (2) of the sealed box (15), manually discharge the gas in the airbag (8), and again fill the airbag (8) with the gas to be measured through the air inlet rubber tube (2) of the sealed box (15). Repeat the inflation and deflation cycles several times until the reading of the standard gas concentration measuring device (12) reaches 99% or more of the concentration value of the gas to be measured, and the other gas in the sealed box (15) is discharged; Step 4, closing the door of the temperature and humidity box (18), adjusting the temperature of the temperature and humidity box (18) to the target temperature, when the temperature in the sealed box (15) is consistent with the target temperature, recording the indication of the gas concentration measuring device (10) to be temperature compensated, setting different target temperatures, repeating the operation, and recording the indications corresponding to different target temperatures; Step 5, changing the concentration of the measured gas, repeating the operations of steps 2 to 4, sorting out the relationship between the measured gas concentration, temperature, and the gas concentration measuring device indication according to the indication corresponding to different target temperatures when measuring the concentration of the measured gas at each concentration, and obtaining the temperature compensation value of the gas concentration measured by the gas concentration measuring device (10) to be temperature compensated under each temperature condition through the relationship between the three. Step 6: adjust the Y-type three-way switch (1), turn off the gas to be measured, introduce the protective gas, adjust the temperature of the temperature and humidity chamber (18) to room temperature, wait until the reading of the thermometer (9) reaches room temperature, open the temperature and humidity chamber (18), and when the concentration of the gas to be measured indicated by the standard gas concentration measuring device (12) is 0%, turn off the protective gas and close the through switch (20).

4. A temperature compensation method for a gas concentration measuring device according to claim 3, characterized in that: In step 3, the continuous inflation and deflation of the airbag (8) is recorded as one time, and the number of times the airbag (8) is inflated and deflated is 6 times or more.

5. The temperature compensation method of a gas concentration measuring device according to claim 3, characterized in that: The gas flow rate of the measured gas in step 2 is 200 mL / min, and the gas flow rate of the measured gas in step 3 is 8-10 L / min. After the other gases in the closed box (15) are discharged and the measured gas is filled in step 3, the measured gas is continued to be ventilated at a flow rate of 20-80 mL / min to maintain the concentration in the closed box (15) during the measurement process.

6. A temperature compensation method for a gas concentration measuring device according to claim 3, characterized in that: The method of introducing the protective gas and discharging the measured gas in step 6 is the same as the method of using the air bag (8) to discharge other gases in the closed box (15) in step 3, that is, the air bag (8) is filled with the protective gas and then released. After multiple filling and discharging, all the measured gas is discharged, and the measured gas concentration reading of the standard gas concentration measuring instrument (12) is 0%.

7. A temperature compensation method for a gas concentration measuring device according to claim 3, characterized in that: The protective gas is nitrogen, and the flow rate of the protective gas is 8-10 L / min.

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