A humidity-adjustable dynamic gas dilution apparatus and a method for preparing a moisture-containing standard gas.

Abstract

The present invention relates to a humidity-adjustable dynamic gas diluter and a method for configuring wet standard gas, including core components such as an air extraction pump, a dehydrogenator, a humidifier, and a humidity measurement module. By adding a dehydrogenator after the humidified dilution gas and dry dilution gas mixing pipeline, the dilution gas is dehydrogenated, and organic matter in different types of dilution gas and water can be removed; the dilution gas is humidified by the humidifier, and the dry gas flow controller and the water-added dilution gas flow controller cooperate with each other to control the ratio of dry gas and wet dilution gas under the condition that the total flow of the two remains unchanged, thereby adjusting the humidity of the dilution gas, measuring the humidity through a humidity measurement module, and feedback adjusting the flow of dry and wet dilution gas, so as to achieve adjustable humidity of the standard gas. The present invention can remove hydrocarbons from the dilution gas and humidify the dilution gas, reduce the interference of organic matter in the dilution gas and the influence of humidity on calibration measurement, and can be used in calibration scenarios of various gas measuring instruments to improve the accuracy of calibration.

Description

Technical Field

[0001] The invention belongs to the field of standard substance manufacturing, and in particular relates to a humidity-adjustable dynamic gas diluter and a method for configuring wet standard gas. Background Art

[0002] Standard gas is a must-have for calibrating analytical instruments to obtain accurate values ​​and is widely used in the field of analysis. At present, traditional standard gases on the market are all configured with dry gas. The concentration of purchased standard gases is often high. In actual use, a dynamic gas diluter is generally used to dilute the high-concentration standard gas into a low-concentration gas. In traditional dynamic gas diluters, dry dilution gas is generally used to mix and dilute the standard gas. Therefore, after being diluted by a dynamic gas diluter to obtain a low-concentration standard gas, it is still a dry standard gas. This leads to a common problem at present: using dry standard gas to calibrate the instrument, and then using the instrument to measure the actual gas of a certain humidity, it is inevitable that measurement errors will occur, especially for components that are easily affected by humidity, such as formaldehyde.

[0003] In addition, the traditional dynamic gas diluter only uses the diluent to directly dilute the high-concentration standard gas, and lacks the removal of potential interfering components in the diluent. For example, for volatile organic compound standard gas, the same components in the diluent may affect the accuracy of the configured standard gas.

[0004] From the above, we can see that the traditional dynamic gas diluter cannot obtain the dilution standard gas of specified humidity, nor can it directly use ambient air as the dilution gas. Even if high-purity gas is purchased as the dilution gas, whether there are interfering components depends entirely on the product quality of the gas manufacturer, and there is a risk of inaccurate quantification. Summary of the invention

[0005] The technical problem solved by the present invention is as follows: In view of the shortcomings of traditional dynamic gas diluters, such as being unable to obtain dilution standard gas of specified humidity and being unable to remove interfering components in carrier gas, a humidity-adjustable dynamic gas diluter and a method for configuring wet standard gas are provided. The humidity-adjustable dynamic gas diluter can adjust the humidity of the carrier gas through a humidifier, and then mix it with the standard gas to prepare a humidity-adjustable standard gas; the dynamic gas diluter includes a dehydrogenator, which can be used to remove hydrocarbons from ambient air or carrier gas, and the dehydrogenated gas output can be used as a diluent gas for the standard gas after passing through a humidifier. The present invention can remove hydrocarbons and humidify, and can meet the calibration requirements of different types of analytical instruments.

[0006] The technical solution of the present invention is: a humidity-adjustable dynamic gas diluter, comprising a dilution gas inlet, a standard gas inlet, a dilution gas outlet, an exhaust gas outlet, an air inlet three-way solenoid valve, an air outlet three-way solenoid valve, an air pump, a dry dilution gas flow controller, a water-added dilution gas flow controller, a humidifier, a dehydrogenator, a standard gas flow controller, a gas mixer, a signal acquisition control and power supply module, a display control terminal and a humidity measurement module;

[0007] The dilution gas inlet is connected to the air inlet three-way solenoid valve and the air outlet three-way solenoid valve in sequence through a pipeline, and the bypass of the air inlet three-way solenoid valve and the air outlet three-way solenoid valve is connected to the air pump; the outlet of the air outlet three-way solenoid valve is respectively connected to the dry dilution gas flow controller and the water dilution gas flow controller through a tee, wherein the outlet of the water dilution gas flow controller is connected to the humidifier; the dehydrogenator inlet is connected to the dry dilution gas flow controller outlet and the humidifier outlet through a tee;

[0008] The standard gas inlet is connected to the standard gas flow controller inlet through a gas path;

[0009] The outlet of the standard gas flow controller, the outlet of the dehydrogenator and the inlet of the gas mixer are connected through a three-way gas path;

[0010] The gas mixer outlet passes through the humidity measurement module and is connected to the dilution gas outlet and the exhaust gas outlet;

[0011] The three-way inlet solenoid valve and the three-way outlet solenoid valve, the vacuum pump, the dry dilution gas flow controller, the water-added dilution gas flow controller, the humidifier, the dehydrogenator, the standard gas flow controller, the humidity measurement module, the signal acquisition control and power supply module and the display control terminal are connected through signal lines and power supply lines.

[0012] Furthermore, the hydrocarbon remover is an adsorption device, a thermal catalytic device or a photocatalytic device for removing volatile organic compounds.

[0013] Furthermore, the humidifier is an atomizing spray humidifier, a water washing humidifier or a water vaporization humidifier.

[0014] Furthermore, the dilution gas inlet introduces hydrocarbon-removing gas or ambient air.

[0015] According to another aspect of the present invention, a method for configuring wet standard gas is also provided, comprising the following steps:

[0016] When positive-pressure cylinder gas is introduced into the dilution gas inlet, the cylinder gas is directly introduced through the air inlet three-way solenoid valve and the air outlet three-way solenoid valve; when non-positive-pressure gas is introduced into the dilution gas inlet, a switching signal is sent to the air inlet three-way solenoid valve and the air outlet three-way solenoid valve through the display control terminal and the signal acquisition control and power supply module, and a start signal is sent to the vacuum pump, then the gas at the dilution gas inlet is introduced under the action of the vacuum pump; the positive-pressure cylinder gas or the gas introduced by the vacuum pump is divided into two paths through the three-way valve, one path is divided into a dry gas flow controller, and the other path is divided into a water addition flow controller and a humidifier, and is humidified in the humidifier; the dry dilution gas flowing out of the dry gas flow controller and the wet dilution gas flowing out of the humidifier are humidified according to the pressure difference between the two paths. The two gases are mixed at a flow ratio and then passed through a dehydrogenator to remove organic matter; the standard gas enters through the standard gas inlet according to the flow rate set by the standard gas flow controller, merges with the dilution gas at the dehydrogenator outlet, and enters the gas mixer for uniform mixing; the humidity measurement module measures the humidity of the mixed gas at the gas mixer outlet, and feeds back the measured value to the signal acquisition control and power supply module and the display control terminal; the signal acquisition control and power supply module adjusts the ratio of dry gas and humidified gas by controlling the dry gas flow controller and the water addition flow controller, and finally controls the humidity of the mixed gas to the target wet standard gas through real-time loop feedback; the wet standard gas leads to a mixed gas with target humidity through the dilution gas outlet and the exhaust gas outlet.

[0017] Furthermore, the non-positive pressure gas is ambient air.

[0018] The differences and advantages of the present invention compared with the prior art are:

[0019] (1) In conventional dynamic gas diluters, dry dilution gas is generally used to mix and dilute the standard gas. Therefore, after being diluted by the dynamic gas diluter to obtain a low-concentration standard gas, it is still a dry standard gas. This leads to a common problem currently: using dry standard gas to calibrate the instrument, and then using the instrument to measure the actual gas of a certain humidity, which will cause some instruments that are greatly affected by humidity to produce measurement errors. Traditional dynamic gas diluters only use dilution gas to directly dilute high-concentration standard gas, and lack the removal of potential interfering components in the dilution gas. For example, for volatile organic compound standard gas, the same components in the dilution gas may affect the accuracy of the configured standard gas. The present invention provides a humidity-adjustable dynamic gas diluter and a method for configuring wet standard gas, which can remove hydrocarbons and humidify, and can reduce the influence of humidity on calibration measurements and the interference of organic matter in the carrier gas. The present invention mainly comprises a dilution gas inlet, a standard gas inlet, a dilution gas outlet, a waste gas outlet, an air inlet three-way solenoid valve, an air outlet three-way solenoid valve, an air pump, a dry dilution gas flow controller, a water-added dilution gas flow controller, a humidifier, a dehydrocarbon remover, a standard gas flow controller, a gas mixer, a signal acquisition control and power supply module, a display control terminal and a humidity measurement module; the dilution gas inlet is connected to the air inlet three-way solenoid valve and the air outlet three-way solenoid valve in sequence through a pipeline, and the bypass of the air inlet three-way solenoid valve and the air outlet three-way solenoid valve is connected to the air pump; the outlet of the air outlet three-way solenoid valve is respectively connected to the dry dilution gas flow controller and the water-added dilution gas flow controller through a three-way, wherein the outlet of the water-added dilution gas flow controller is connected to The dehydrocarbon inlet is connected to the dry dilution gas flow controller outlet and the humidifier outlet through a tee; the standard gas inlet is connected to the standard gas flow controller inlet through an air path; the standard gas flow controller outlet, dehydrocarbon outlet and gas mixer inlet are connected through a tee air path; the gas mixer outlet is connected to the dilution gas outlet and the exhaust gas outlet through a humidity measurement module; the air inlet three-way solenoid valve and the air outlet three-way solenoid valve, the air pump, the dry dilution gas flow controller, the water dilution gas flow controller, the humidifier, the dehydrocarbon, the standard gas flow controller, the humidity measurement module, the signal acquisition control and power supply module and the display control terminal are connected through signal lines and power supply lines. The connection method of this humidity-adjustable dynamic gas diluter is different from the prior art.

[0020] (2) The innovation of the present invention lies in: a dynamic gas diluter with adjustable humidity, including core components such as an air pump, a dehydrogenator, a humidifier, and a humidity measurement module. By adding a dehydrogenator after the mixing pipeline of the humidified dilution gas and the dry dilution gas, the dilution gas is dehydrogenated, and the organic matter in different types of dilution gases (ambient air, synthetic air, high-purity nitrogen, etc.) and water (ordinary tap water, high-purity water, purified water, etc.) can be removed; the dilution gas is humidified by the humidifier, and the dry dilution gas flow controller and the water-added dilution gas flow controller cooperate with each other. Under the condition that the total flow of the two remains unchanged, the ratio of dry gas and wet dilution gas is controlled, thereby adjusting the humidity of the dilution gas, measuring the humidity through the humidity measurement module, and feedback adjusting the flow of dry and wet dilution gases, so as to achieve adjustable humidity of the calibration gas. Compared with the traditional dynamic gas diluter, the present invention can not only dehydrogenate the dilution gas, but also humidify the dilution gas, which can reduce the interference of organic matter in the dilution gas and the influence of humidity on calibration measurement. The present invention can be used in the calibration scenarios of various gas measuring instruments to improve the accuracy of calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a humidity-adjustable dynamic gas diluter of the present invention;

[0022] Figure 2 The present invention provides a humidity-adjustable dynamic gas diluter configured with a test result of a wet standard gas.

[0023] In the figure, 1 is the dilution gas inlet; 2 is the standard gas inlet; 3 is the dilution gas outlet; 4 is the exhaust gas outlet; 5 is the air inlet three-way solenoid valve; 6 is the air outlet three-way solenoid valve; 7 is the vacuum pump; 8 is the dry dilution gas flow controller; 9 is the water-added dilution gas flow controller; 10 is the humidifier; 11 is the dehydrogenator; 12 is the standard gas flow controller; 13 is the gas mixer; 14 is the signal acquisition control and power supply module; 15 is the display control terminal; 16 is the humidity measurement module. DETAILED DESCRIPTION

[0024] 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 only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0025] like Figure 1As shown, a humidity-adjustable dynamic gas diluter according to an embodiment of the present invention comprises a dilution gas inlet 1, a standard gas inlet 2, a dilution gas outlet 3, a waste gas outlet 4, an air inlet three-way solenoid valve 5, an air outlet three-way solenoid valve 6, an air pump 7, a dry dilution gas flow controller 8, a water-added dilution gas flow controller 9, a humidifier 10, a dehydrogenator 11, a standard gas flow controller 12, a gas mixer 13, a signal acquisition control and power supply module 14, a display control terminal 15 and a humidity measurement module 16; the dilution gas inlet 1 is connected to the air inlet three-way solenoid valve 5 and the air outlet three-way solenoid valve 6 in sequence through a pipeline, and the bypass of the air inlet three-way solenoid valve 5 and the air outlet three-way solenoid valve 6 is connected to the air pump 7; the outlet of the air outlet three-way solenoid valve 6 is connected to the dry dilution gas flow controller 8 and the water-added dilution gas flow controller 9 through a three-way connection, wherein the water-added dilution gas flow controller The controller 9 outlet is connected to the humidifier 10; the dehydrogenator 11 inlet is connected to the dry dilution gas flow controller 8 outlet and the humidifier 10 outlet through a tee; the standard gas inlet 2 is connected to the standard gas flow controller 12 inlet through a gas path; the standard gas flow controller 12 outlet, the dehydrogenator 11 outlet and the gas mixer 13 inlet are connected through a tee gas path; the gas mixer 13 outlet is connected to the dilution gas outlet 3 and the exhaust gas outlet 4 through a humidity measurement module 16; the air inlet three-way solenoid valve 5 and the air outlet three-way solenoid valve 6, the air pump 7, the dry dilution gas flow controller 8, the water-added dilution gas flow controller 9, the humidifier 10, the dehydrogenator 11, the standard gas flow controller 12, the humidity measurement module 16, the signal acquisition control and power supply module 14 and the display control terminal 15 are connected through signal lines and power supply lines.

[0026] The present invention provides a method for configuring wet standard gas for a humidity-adjustable dynamic gas diluter, and the specific steps are as follows:

[0027] If the dilution gas inlet 1 is positive-pressure cylinder gas, the cylinder gas can be directly introduced through the air inlet three-way solenoid valve 5 and the air outlet three-way solenoid valve 6; if the dilution gas inlet 1 is non-positive-pressure gas such as ambient air, a switching signal can be sent to the air inlet three-way solenoid valve 5 and the air outlet three-way solenoid valve 6 through the display control terminal 15 and the signal acquisition control and power supply module 14, and a start signal can be sent to the air pump 7, so that the gas at the dilution gas inlet 1 can be introduced under the action of the air pump 7; the positive-pressure cylinder gas or the gas introduced by the air pump 7 is divided into two paths through the three-way valve, one path is divided into a dry gas flow controller 8, and the other path is divided into a water addition flow controller 9 and a humidifier 10, and is humidified in the humidifier 10; the dry dilution gas flowing out of the dry gas flow controller 8 and the wet dilution gas flowing out of the humidifier 10 The dilution gas is mixed according to the flow ratio, and then passes through the dehydrogenator 11 to remove the organic matter therein; the standard gas enters through the standard gas inlet 2 according to the flow rate set by the standard gas flow controller 12, merges with the dilution gas at the outlet of the dehydrogenator 11, and enters the gas mixer 13 and is evenly mixed; the humidity measurement module 16 measures the humidity of the mixed gas at the outlet of the gas mixer 13, and feeds back the measured value to the signal acquisition control and power supply module 14 and the display control terminal 15, the signal acquisition control and power supply module 14 adjusts the ratio of dry gas and humidified gas by controlling the dry gas flow controller 8 and the water addition flow controller 9, and finally controls the humidity of the mixed gas to the target wet standard gas through real-time loop feedback; the wet standard gas leads out the mixed gas with the target humidity through the dilution gas outlet 3 and the exhaust gas outlet 4.

[0028] In order to obtain the effect of removing organic matter, in the specific implementation, the dehydrogenator 11 can be an adsorption device for removing volatile organic matter (including material adsorption and low-temperature adsorption, etc.), a thermal catalytic device, or a photocatalytic device; the adsorption device will also adsorb the water in the dilution gas, which may generally affect the humidity of the dilution gas; the thermal catalytic device can convert trace amounts of hydrocarbons into carbon dioxide and water, which will basically not affect the humidity; the photocatalytic device may produce ozone for oxygen-containing dilution gas, which is not suitable for dilution gas of organic standard gas. Therefore, on the whole, each device can be configured according to different needs. For the configuration of organic standard gas, it is best to equip it with a thermal catalytic device.

[0029] In order to obtain the dilution gas humidification effect, in the specific implementation, the humidifier 10 can be an atomizing spray humidifier, a water washing humidifier, or a water vaporization humidifier; from the perspective of safety, a water washing humidifier is the best, and will not cause humidity oversaturation and produce condensed water in the downstream pipeline.

[0030] According to different application requirements, in specific implementation, the dilution gas inlet 1 may be dehydrogenated gas or ambient air. For gases with special requirements, dehydrogenated gas may be directly introduced as dilution gas; for some instruments that can directly sample air, using ambient air dehydrogenated (without water) as dilution gas to calibrate the instrument is more in line with the actual environment and can obtain more accurate measurement results.

[0031] In order to obtain a mixed gas with controllable humidity, in specific implementation, the humidity measurement module 16 can be a dew point sensor or a traditional humidity sensor, but a dew point sensor can achieve a more accurate effect.

[0032] Example 1

[0033] High-purity nitrogen is introduced into the dilution gas inlet 1, and is directly introduced through the inlet three-way solenoid valve 5 and the outlet three-way solenoid valve 6; the high-purity nitrogen is divided into two paths through the three-way valve, one path is divided into the dry gas flow controller 8, and the other path is divided into the water flow controller 9 and the humidifier 10, and is humidified in the humidifier 10; the dry dilution gas flowing out of the dry gas flow controller 8 and the wet dilution gas flowing out of the humidifier 10 are mixed according to the flow ratio, and then the organic matter therein is removed by the dehydrogenator 11; the standard gas enters through the standard gas inlet 2 according to the flow rate set by the standard gas flow controller 12, and is discharged from the dehydrogenator 11 The dilution gas converges and enters the gas mixer 13 to be mixed evenly; the humidity measurement module 16 measures the humidity of the mixed gas at the outlet of the gas mixer 13, and feeds back the measured value to the signal acquisition control and power supply module 14 and the display control terminal 15. The signal acquisition control and power supply module 14 adjusts the ratio of dry gas and humidified gas by controlling the dry gas flow controller 8 and the water addition flow controller 9, and finally controls the humidity of the mixed gas to the target wet standard gas through real-time loop feedback; the wet standard gas leads to the mixed gas of the target humidity through the dilution gas outlet 3 and the exhaust gas outlet 4. This process is a humidity setting control process. In the experiment, it is gradually set from 5% to 100% (5%, 20%, 60%, 80%, 85%, 100%), and then from 100% to 5% (100%, 90%, 70%, 40%, 15%, 5%). After each humidity setting, wait for 300 seconds to understand the control of the humidity rising process and the falling process.

[0034] Figure 2The figure shows the humidity control test result of a humidity-adjustable dynamic gas diluter of the present invention configured with wet standard gas according to the above process. The black line is the set target relative humidity value, and the gray line is the relative humidity value of the wet standard gas actually configured by the present invention. It can be seen that the present invention can configure wet standard gas with target humidity in a short time by setting the relative humidity arbitrarily between 5% and 100%. The dehydrogenator 11 used in this test is a thermal catalytic device, which removes organic matter at a high temperature of 300°C by heating the platinum wool filled in the tube; the humidifier 10 used is a water-washing humidifier, and the humidity measurement module 16 used is a dew point sensor. Among them, the water-washing humidifier used is a water tank including an air inlet and an air outlet. The water tank is divided into three layers, the middle layer is a water-containing layer, and the upper and lower layers are respectively connected to the air outlet and the air inlet. The interlayer is a microporous plate (aperture 0.2mm, hole spacing 1mm), which is air-permeable and water-impermeable. The dilution gas enters the bottom layer of the water tank through the air inlet, and enters the water layer through the microporous plate. The dilution gas is humidified after passing through the water layer, precipitates to the upper layer through the upper microporous plate, and then is led out through the air outlet.

[0035] Parts not described in detail in the specification of the present invention belong to the well-known technology in the art.

[0036] The above descriptions are only some specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any person familiar with the art within the technical scope disclosed in the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for configuring wet standard gas for a humidity-adjustable dynamic gas diluter, characterized in that: The method uses a humidity-adjustable dynamic gas diluter, which comprises a dilution gas inlet (1), a standard gas inlet (2), a dilution gas outlet (3), an exhaust gas outlet (4), an air inlet three-way solenoid valve (5), an air outlet three-way solenoid valve (6), an air pump (7), a dry dilution gas flow controller (8), a water-added dilution gas flow controller (9), a humidifier (10), a dehydrogenator (11), a standard gas flow controller (12), a gas mixer (13), a signal acquisition control and power supply module (14), a display control terminal (15) and a humidity measurement module (16); The dilution gas inlet (1) is connected to the air inlet three-way solenoid valve (5) and the air outlet three-way solenoid valve (6) in sequence through pipelines, and the bypass of the air inlet three-way solenoid valve (5) and the air outlet three-way solenoid valve (6) is connected to the air pump (7); the outlet of the air outlet three-way solenoid valve (6) is connected to the dry dilution gas flow controller (8) and the water-added dilution gas flow controller (9) respectively through a three-way connection, wherein the outlet of the water-added dilution gas flow controller (9) is connected to the humidifier (10); the inlet of the dehydrogenator (11) is connected to the outlet of the dry dilution gas flow controller (8) and the outlet of the humidifier (10) through a three-way connection; The standard gas inlet (2) is connected to the inlet of the standard gas flow controller (12) via a gas path; The outlet of the standard gas flow controller (12), the outlet of the dehydrogenator (11) and the inlet of the gas mixer (13) are connected via a three-way gas path; The outlet of the gas mixer (13) passes through a humidity measurement module (16) and is connected to a dilution gas outlet (3) and an exhaust gas outlet (4); The three-way air inlet solenoid valve (5), the three-way air outlet solenoid valve (6), the air extraction pump (7), the dry dilution gas flow controller (8), the water-added dilution gas flow controller (9), the humidifier (10), the dehydrogenator (11), the standard gas flow controller (12), the humidity measurement module (16), the signal acquisition control and power supply module (14) and the display control terminal (15) are connected via signal lines and power supply lines; The hydrocarbon remover (11) is an adsorption device, a thermal catalytic device or a photocatalytic device for removing volatile organic matter; The humidifier (10) is an atomizing spray humidifier, a water washing humidifier or a water vaporization humidifier; The method comprises the following steps: When positive pressure cylinder gas is introduced into the dilution gas inlet (1), the cylinder gas is directly introduced through the inlet three-way solenoid valve (5) and the outlet three-way solenoid valve (6); when non-positive pressure gas is introduced into the dilution gas inlet (1), a switching signal is sent to the inlet three-way solenoid valve (5) and the outlet three-way solenoid valve (6) through the display control terminal (15) and the signal acquisition control and power supply module (14), and a start signal is sent to the vacuum pump (7), so that the gas at the dilution gas inlet (1) is discharged during the vacuum pumping. The gas introduced by the positive pressure cylinder gas or the vacuum pump (7) is divided into two paths through a three-way valve, one path is divided into a dry dilution gas flow controller (8), and the other path is divided into a water-added dilution gas flow controller (9) and a humidifier (10), and is humidified in the humidifier (10); the dry dilution gas flowing out of the dry dilution gas flow controller (8) and the wet dilution gas flowing out of the humidifier (10) are mixed according to a flow ratio, and then pass through a dehydrogenator (11) to remove organic matter therein; The standard gas enters through the standard gas inlet (2) at a flow rate set by the standard gas flow controller (12), merges with the dilution gas at the outlet of the dehydrogenator (11), and enters the gas mixer (13) for uniform mixing; the humidity measurement module (16) measures the humidity of the mixed gas at the outlet of the gas mixer (13), and feeds back the measured value to the signal acquisition control and power supply module (14) and the display control terminal (15); the signal acquisition control and power supply module (14) adjusts the ratio of dry gas to humidified gas by controlling the dry dilution gas flow controller (8) and the water-added dilution gas flow controller (9), and finally controls the humidity of the mixed gas to the target wet standard gas through real-time loop feedback; the wet standard gas passes through the dilution gas outlet (3) and The exhaust gas outlet (4) leads out a mixed gas of target humidity; the humidity-adjustable dynamic gas diluter is capable of removing organic matter from different types of dilution gases and water by adding a dehydrogenator after the mixing pipeline of the humidified dilution gas and the dry dilution gas, wherein the different types of dilution gases are ambient air, synthetic air, and high-purity nitrogen; the dilution gas is humidified by the humidifier, and the dry dilution gas flow controller and the water-added dilution gas flow controller cooperate with each other to control the ratio of the dry gas to the wet dilution gas while keeping the total flow of the two unchanged, thereby adjusting the humidity of the dilution gas; the humidity is measured by the humidity measurement module, and the flow of the dry and wet dilution gases is adjusted by feedback, so as to achieve adjustable humidity of the standard gas.

Images