Humidity meter inspection method and standard humidity generating device and method

Abstract

The present invention discloses a standard humidity generating device, including an evaporator, a reheater and an oxygen measurement and humidity conversion display. The evaporator is filled with liquid water, the gas outlet of the evaporator is connected to the gas inlet of the reheater through a steam pipe, the gas outlet of the reheater is connected to the oxygen measurement and humidity conversion display through a gas transmission pipe, the gas inlet of the evaporator is connected to a standard gas inlet pipe, a valve and a flow meter are installed on the standard gas inlet pipe, and the valve is located upstream of the flow meter. A standard humidity generating method and a humidity meter inspection method are also disclosed. The beneficial effects of the present invention are: the oxygen standard gas humidification oxygen measurement method is adopted, and there is no humidity sensor detection in the whole method, that is, the dry oxygen standard gas is humidified and then heated to obtain a humidity gas environment with a certain humidity ratio, and then the oxygen content in the mixed gas is measured to obtain the humidity value of the humidity environment. The equipment of the whole device is simple, and the standard humidity is easy to manufacture, and the humidity meter is convenient to detect.

Description

Technical Field

[0001] The invention relates to the technical field of standard humidity production, in particular to a humidity meter inspection method and a standard humidity generating device and method. Background Art

[0002] At present, the methods for manufacturing / generating a standard humidity gas environment (humidity generation for short) are generally technically complex and not easy to implement. For example, they require complex control devices, such as a constant temperature and humidity chamber, high-precision flow control and detection equipment, and accurate detection of the mixed flow of dry and wet gases used for mixing, or a hygrometer that has been calibrated with a standard humidity environment to directly detect the humidity value of the manufactured / generated standard humidity gas environment.

[0003] In addition, the instrument used to measure the humidity value of the standard humidity gas environment is still a hygrometer, and the accuracy of the hygrometer still needs to be measured by another standard humidity generating device, which is not convenient for self-accuracy calibration at any time. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, adopt an oxygen standard gas humidification oxygen measurement method, and provide a hygrometer inspection method and a standard humidity generating device and method.

[0005] The object of the present invention is achieved through the following technical scheme: a standard humidity generating device comprises an evaporator, a reheater and an oxygen measurement and humidity conversion display, the evaporator is filled with liquid water, the gas outlet of the evaporator is connected to the gas inlet of the reheater through a steam pipe, the gas outlet of the reheater is connected to the oxygen measurement and humidity conversion display through a gas transmission pipe, the gas inlet of the evaporator is connected to a standard gas inlet pipe, a valve and a flow meter are installed on the standard gas inlet pipe, and the valve is located upstream of the flow meter.

[0006] Preferably, the valve is a ball valve.

[0007] Preferably, the liquid water is distilled water.

[0008] Preferably, the liquid water level in the evaporation tank is located below the air inlet of the evaporation tank.

[0009] Preferably, the gas in the calibration gas inlet pipe is dry oxygen with a known accurate concentration.

[0010] Preferably, the oxygen-humidity conversion display instrument is provided with a display screen for setting and displaying dry base oxygen value, wet base oxygen value and humidity value.

[0011] Preferably, the outlet of the oxygen-to-humidity display instrument is also provided with an air supply pipe, and the outlet of the air supply pipe is connected to the air inlet of the humidity meter to be measured.

[0012] The standard humidity generation method includes the following steps:

[0013] S1: Add water, add liquid water into the evaporation tank, and the liquid water level is below the air inlet of the evaporation tank;

[0014] S2: Heating and emptying, the evaporator and reheater work, the evaporator heats the liquid water to evaporate the gas molecules dissolved in the water, and the reheater heats the mixed gas to ensure that the mixed gas is in gaseous state in the gas pipeline and the oxygen conversion humidity display instrument;

[0015] S3: Standard gas: when the residual oxygen content in the mixed gas is lower than the required value, open the valve and introduce dry oxygen with known accurate concentration;

[0016] S4: Read the humidity value. The humidity value is read through the oxygen conversion humidity display instrument. This humidity value is calculated by the oxygen conversion humidity display instrument and displayed on the display screen. The calculation method of the humidity value is: humidity value = 1-(wet basis oxygen value / dry basis oxygen value).

[0017] The humidity meter inspection method includes a standard humidity generating device and the following steps:

[0018] S1: Add water, add liquid water into the evaporation tank, and the liquid water level is below the air inlet of the evaporation tank;

[0019] S2: Heating and emptying, the evaporator and reheater work, the evaporator heats the liquid water to evaporate the gas molecules dissolved in the water, and the reheater heats the mixed gas to ensure that the mixed gas is in gaseous state in the gas pipeline and the oxygen conversion humidity display instrument;

[0020] S3: Standard gas: when the residual oxygen content in the mixed gas is lower than the required value, open the valve and introduce dry oxygen with known accurate concentration;

[0021] S4: Read the humidity value. The humidity value is read through the oxygen-converted humidity display instrument. The humidity value is calculated by the oxygen-converted humidity display instrument and displayed on the display screen. The calculation method of the humidity value is: humidity value = 1-(wet base oxygen value / dry base oxygen value);

[0022] S5: Inspection: Pass the mixed gas that has passed the oxygen-to-humidity display instrument into the hygrometer to be tested, and check whether the hygrometer to be tested is qualified by the reading of the hygrometer to be tested. When the hygrometer to be tested is consistent with the oxygen-to-humidity display instrument, the hygrometer to be tested is qualified; when the hygrometer to be tested is inconsistent with the oxygen-to-humidity display instrument, the hygrometer to be tested is unqualified.

[0023] The standard humidity generation method of the present invention adopts the oxygen standard gas humidification oxygen measurement method. There is no humidity sensor detection in the whole method. That is, the dry oxygen standard gas is humidified and then heated to obtain a humidity gas environment with a certain humidity ratio. Then, the oxygen content in the mixed gas is measured to obtain the humidity value of the manufactured humidity environment. In addition, the oxygen standard gas is easy to purchase and can be purchased directly from an oxygen standard gas manufacturer with production qualifications. Therefore, the present invention has the following advantages:

[0024] 1. The method is simple: the humidity value can be obtained by humidifying the mixed gas with oxygen standard gas to detect the oxygen content. The device is simple and easy to operate. As long as the customer has oxygen standard gas, this method can be used at any time to achieve standard humidity generation and humidity detection.

[0025] 2. Simple equipment composition: Users can easily obtain oxygen standard gas with accurate oxygen detection equipment. No special complex control device is required. Even at the terminal site in a simple environment, the manufacturing standard humidity environment can be achieved at any time.

[0026] 3. High accuracy and can be calibrated at any time: The humidity detection accuracy in this method can be tested and self-calibrated at any time through oxygen standard gas and oxygen content detection equipment. That is, the reliability and accuracy of this method can be tested and guaranteed by testing the accuracy and calibration of the oxygen content detection equipment with oxygen standard gas. There is no need to use any equipment outside the method to measure and calibrate the accuracy of the internal equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of the present invention

[0028] In the figure, 1-standard gas inlet pipe, 2-valve, 3-flow meter, 4-evaporator, 5-reheater, 6-oxygen measurement humidity conversion display instrument, 7-humidity meter to be measured, 8-steam pipe, 9-gas transmission pipe. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Embodiment 1

[0036] like Figure 1As shown, the standard humidity generating device includes an evaporator 4, a reheater 5 and an oxygen measurement and humidity conversion display 6. The evaporator 4 is an existing commercially available device with a heating machine temperature adjustment and control function. Specifically, the evaporator 4 has a storage tank, a heater for evaporation and a temperature control system for adjusting and controlling the temperature. The evaporator 4 is filled with liquid water, and the liquid water does not contain other impurities as much as possible. Preferably, the liquid water is distilled water. The heater heats the liquid water, and the liquid water evaporates. During the initial heating, the gas molecules dissolved in the water are evaporated. Further, the gas outlet of the evaporator 4 is connected to the gas inlet of the reheater 5 through a steam pipe 8, and the gas outlet of the reheater 5 is connected to the oxygen measurement and humidity conversion display 6 through a gas transmission pipe 9. When in use, the temperature control system should ensure that the evaporated water is in a gaseous state in the evaporator 4 and the steam pipe 8 to avoid steam condensation. The reheater 5 is also a commercially available device with heating and temperature adjustment and control functions. The heater heats the steam again to ensure that the steam does not condense and is always in a gaseous state. When the gaseous steam enters After arriving at the oxygen measurement and humidity conversion display instrument 6, the oxygen measurement and humidity conversion display instrument 6 is provided with a display screen for setting and displaying a dry basis oxygen value, a wet basis oxygen value and a humidity value. Therefore, in the present embodiment, the oxygen measurement and humidity conversion display instrument 6 has the functions of setting and displaying a dry basis oxygen value, measuring and displaying a wet basis oxygen value and calculating and displaying a humidity value. The dry basis oxygen value, the wet basis oxygen value and the humidity value can be read out through the display screen, wherein the dry basis oxygen value is a set value, the wet basis oxygen value is a measured value, and the humidity value is a value calculated based on the dry basis oxygen value and the wet basis oxygen value. Specifically, the humidity value=1-(wet basis oxygen value / dry basis oxygen value), wherein the dry basis oxygen value is a dry oxygen standard gas of known accurate concentration, which can be purchased commercially, and the unit is volume percentage concentration, while the wet basis oxygen value is the oxygen concentration value in the mixed gas, and the unit is volume percentage concentration, and the mixed gas refers to a gas formed by mixing a dry oxygen standard gas of known accurate concentration with oxygen-free water vapor evaporated at high temperature.

[0037] In this embodiment, the air inlet of the evaporation tank 4 is connected to the standard gas inlet pipe 1, and a valve 2 and a flow meter 3 are installed on the standard gas inlet pipe 1. The valve 2 is located upstream of the flow meter 3. Further, the valve 2 adopts a ball valve, and the gas in the standard gas inlet pipe 1 is dry oxygen with a known accurate concentration.

[0038] In this embodiment, the evaporator 4, the reheater 5, the steam pipe 8 and the gas pipe 9 need to be emptied first. Specifically, the valve 2 is closed first, and then the evaporator 4 and the reheater 5 are operated. The evaporator 4 heats the distilled water to evaporate the gas molecules dissolved in the distilled water. It should be noted that the temperature in the evaporator 4 needs to be adjusted by the temperature control system to ensure that the evaporated gas in the evaporator 4 and the steam pipe 8 is always in a gaseous state to avoid condensation. Similarly, the reheater 5 heats the steam again to ensure that the steam entering the reheater 5 and the gas pipe 9 is not condensed and is always in a gaseous state. The humidity value and the wet-based oxygen value are read out by the oxygen conversion humidity display 6. When the wet-based oxygen value is lower than the required value, it means that the oxygen dissolved in the distilled water The requirement has been met, that is, the heating and emptying have met the use requirements. When the emptying is completed, the valve 2 is opened, and the oxygen standard gas of known accurate concentration enters the evaporator 4 through the standard gas inlet pipe 1. Further, the liquid water level in the evaporator 4 is located below the air inlet of the evaporator 4, thereby preventing the oxygen standard gas of known accurate concentration from dissolving in the distilled water. The oxygen standard gas of known accurate concentration and the evaporated water vapor entering the evaporator 4 are mixed to form a mixed gas, and the release amount of the oxygen standard gas of known accurate concentration is controlled by the flowmeter 3. Preferably, the flow rate of the oxygen standard gas of known accurate concentration is 1L / min. Finally, the dry base oxygen value, wet base oxygen value and humidity value on the oxygen measurement humidity conversion display 6 are read to obtain the standard humidity value.

[0039] In this embodiment, the outlet of the oxygen-to-humidity display 6 is also provided with an air supply pipe, and the outlet of the air supply pipe is connected to the air inlet of the hygrometer to be measured 7. The mixed gas in the air supply pipe is also heated by a heater, so as to ensure that the mixed gas in the air supply pipe does not condense and is always in a gaseous state. After the mixed gas enters the hygrometer to be measured 7, the hygrometer to be measured 7 can measure the humidity value. By comparing it with the standard humidity value, it can be concluded whether the hygrometer to be measured 7 is qualified, that is, when the hygrometer to be measured 7 is consistent with the oxygen-to-humidity display 6, the hygrometer to be measured 7 is qualified, and when the hygrometer to be measured 7 is inconsistent with the oxygen-to-humidity display 6, the hygrometer to be measured 7 is unqualified.

[0040] Embodiment 2

[0041] The standard humidity generation method includes the following steps:

[0042] S1: adding water, adding liquid water into the evaporation tank 4, the water level of the liquid water is located below the air inlet of the evaporation tank 4, preferably, the liquid water is distilled water, and the volume of the distilled water is half of the volume of the evaporation tank 4;

[0043] S2: heating and emptying, the evaporator 4 and the reheater 5 work, the evaporator 4 heats the liquid water to evaporate the gas molecules dissolved in the water, and the reheater 5 heats the mixed gas to ensure that the mixed gas is in a gaseous state in the gas pipeline 9 and the oxygen-to-humidity display 6. During the heating and emptying process, the oxygen-to-humidity display 6 can detect the humidity value and the wet-based oxygen value in real time;

[0044] S3: Pass standard gas. When the oxygen-humidity conversion display instrument 6 detects that the wet-base oxygen value is lower than the required value, that is, the residual oxygen content in the mixed gas is lower than the required value, open valve 2 and pass dry oxygen with a known accurate concentration. The oxygen flow rate is controlled at 1L / min. Under normal circumstances, it can be emptied within 5 minutes, so valve 2 can be opened after 5 minutes.

[0045] S4: Read the humidity value. The humidity value is read through the oxygen measurement and humidity conversion display instrument 6. This humidity value is calculated by the oxygen measurement and humidity conversion display instrument and displayed on the display screen. The calculation method of the humidity value is: humidity value = 1-(wet basis oxygen value / dry basis oxygen value). The humidity value obtained at this time is the standard humidity value.

[0046] Embodiment three:

[0047] The humidity meter inspection method includes a standard humidity generating device and the following steps:

[0048] S1: adding water, adding liquid water into the evaporation tank 4, the water level of the liquid water is located below the air inlet of the evaporation tank 4, preferably, the liquid water is distilled water, and the volume of the distilled water is half of the volume of the evaporation tank 4;

[0049] S2: heating and emptying, the evaporator 4 and the reheater 5 work, the evaporator 4 heats the liquid water to evaporate the gas molecules dissolved in the water, and the reheater 5 heats the mixed gas to ensure that the mixed gas is in a gaseous state in the gas pipeline 9 and the oxygen-to-humidity display 6. During the heating and emptying process, the oxygen-to-humidity display 6 can detect the humidity value and the wet-based oxygen value in real time;

[0050] S3: Pass standard gas. When the oxygen-humidity conversion display instrument 6 detects that the wet-base oxygen value is lower than the required value, that is, the residual oxygen content in the mixed gas is lower than the required value, the valve 2 is opened. Preferably, the wet-base oxygen value is zero, that is, after the residual oxygen content is zero, dry oxygen with a known accurate concentration is passed in, and the oxygen flow rate is controlled at 1L / min. Under normal circumstances, it can be emptied within 5 minutes, so the valve 2 can be opened after 5 minutes.

[0051] S4: Read the humidity value. The humidity value is read out by the oxygen-converted humidity display instrument 6. The humidity value is calculated by the oxygen-converted humidity display instrument and displayed on the display screen. The calculation method of the humidity value is: humidity value = 1-(wet base oxygen value / dry base oxygen value). The humidity value obtained at this time is the standard humidity value;

[0052] S5: Inspection: The mixed gas passing through the oxygen-to-humidity conversion display instrument 6 is passed into the hygrometer to be tested 7, and the hygrometer to be tested 7 is checked for qualification through the reading of the hygrometer to be tested 7. When the hygrometer to be tested 7 is consistent with the oxygen-to-humidity conversion display instrument 6, the hygrometer to be tested 7 is qualified; when the hygrometer to be tested 7 is inconsistent with the oxygen-to-humidity conversion display instrument 6, the hygrometer to be tested 7 is unqualified.

[0053] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for generating standard humidity using a standard humidity generating device, characterized in that: The following steps are involved: S1: adding water, adding liquid water into the evaporation tank, wherein the water level of the liquid water is below the air inlet of the evaporation tank; S2: Heating and emptying, the evaporator and reheater work, the evaporator heats the liquid water to evaporate the gas molecules dissolved in the water, and the reheater heats the mixed gas to ensure that the mixed gas is in gaseous state in the gas pipeline and the oxygen conversion humidity display instrument; S3: Standard gas: when the residual oxygen content in the mixed gas is lower than the required value, open the valve and introduce dry oxygen with known accurate concentration; S4: Read the humidity value. The humidity value is read through the oxygen-converted humidity display instrument. The humidity value is calculated by the oxygen-converted humidity display instrument and displayed on the display screen. The calculation method of the humidity value is: humidity value = 1-(wet base oxygen value / dry base oxygen value); The standard humidity generating device comprises an evaporator, a reheater and an oxygen measurement-conversion humidity display. The evaporator is filled with liquid water. The gas outlet of the evaporator is connected to the gas inlet of the reheater through a steam pipe. The gas outlet of the reheater is connected to the oxygen measurement-conversion humidity display through a gas transmission pipe. The gas inlet of the evaporator is connected to a standard gas inlet pipe. A valve and a flow meter are installed on the standard gas inlet pipe. The valve is located upstream of the flow meter.

2. The method for generating standard humidity using a standard humidity generating device according to claim 1, characterized in that: The valve is a ball valve.

3. The method for generating standard humidity using a standard humidity generating device according to claim 2, characterized in that: The liquid water is distilled water.

4. The method for generating standard humidity using a standard humidity generating device according to claim 3, characterized in that: The water level of the liquid water in the evaporation tank is located below the air inlet of the evaporation tank.

5. The method for generating standard humidity using a standard humidity generating device according to claim 4, characterized in that: The gas in the standard gas inlet pipe is dry oxygen with known accurate concentration.

6. The method for generating standard humidity using a standard humidity generating device according to claim 5, characterized in that: The oxygen measurement and humidity conversion display instrument is provided with a display screen for setting and displaying a dry base oxygen value, a wet base oxygen value and a humidity value.

7. The method for generating standard humidity using a standard humidity generating device according to any one of claims 1 to 6, characterized in that: The outlet of the oxygen-to-humidity display instrument is also provided with an air supply pipe, and the outlet of the air supply pipe is connected to the air inlet of the humidity meter to be measured.

8. The method for generating standard humidity using a standard humidity generating device according to claim 1, characterized in that: The following steps are also included: S5: Inspection: Pass the mixed gas that has passed the oxygen-to-humidity display instrument into the hygrometer to be tested, and check whether the hygrometer to be tested is qualified by the reading of the hygrometer to be tested. When the hygrometer to be tested is consistent with the oxygen-to-humidity display instrument, the hygrometer to be tested is qualified; when the hygrometer to be tested is inconsistent with the oxygen-to-humidity display instrument, the hygrometer to be tested is unqualified.

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