Mine gas sensor concentration automatic calibration test platform and test method

Abstract

The application discloses a kind of mine gas sensor concentration automatic mark detection test board and test method, wherein test board includes data processing main control module, industrial touch screen computer, and sequentially connected: gas tank, pressure reducing valve, pneumatic electromagnetic reversing valve, multi-path gas distributor, multi-path gas distributor is connected with several passages respectively, for dividing the gas of gas tank into each passage, passage includes sequentially arranged: for adjusting the multi-path combination standard gas meter controller of gas angle, for measuring the high-precision standard gas meter of gas flow, the mine gas sensor of being detected;Data processing main control module is electrically connected with pneumatic electromagnetic reversing valve, high-precision standard gas meter, multi-path combination standard gas meter controller, the mine gas sensor of being detected respectively.The application does not need to use the remote controller necessary for conventional technology, realizes the rapid mark detection of mine gas sensor, saves labor intensity, reduces working hours, and also has the advantages of high control and mark detection precision.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of concentration calibration and detection of mine-used gas sensors, in particular to a mine-used gas sensor concentration automatic calibration and detection test bench and a test method. BACKGROUND

[0002] The mine-used gas sensor is a key component of the coal mine safety monitoring system and a front-end detection element of the coal mine safety monitoring system, which can detect the concentration of various toxic and harmful gases in the mine in real time. The common gas sensor uses a gas-sensitive element as the core component and is made of a thermal catalytic principle. Such instruments will produce phenomena such as zero drift and range drift after being used for a period of time. If they are not timely adjusted, the concentration of toxic and harmful gases will exceed the warning line, and the sensor will not issue a timely alarm. The stability and reliability of their work are of great significance to the entire monitoring system to determine whether the concentration in the mine is over limit. Therefore, periodic calibration and detection are needed to ensure the reliable and stable operation of the production line monitoring equipment.

[0003] At present, the commonly used mine-used gas sensor concentration calibration and detection technology still has the following problems: the mine-used gas sensor concentration calibration and detection has always been manually performed by using a remote controller. Such calibration and detection process based on infrared remote control technology is tedious, labor-intensive, low in work efficiency, easy to cause harm to the human body, and the calibration and detection accuracy is also affected by human factors. Moreover, the infrared remote control calibration instrument can only calibrate a single sensor at the same time, and is not suitable for batch calibration of the same type of sensors. SUMMARY

[0004] In view of the problems existing in the prior art, the present application provides a mine-used gas sensor concentration automatic calibration and detection test bench and a test method, which can quickly improve the calibration and detection efficiency of the mine-used gas concentration sensor, replace manual work, calibrate and detect in batches, have high calibration and detection accuracy, and save time for frequent replacement of sensors.

[0005] The mine-used gas sensor concentration automatic calibration and detection test bench comprises a data processing main control module, an industrial touch screen computer, and a gas tank, a pressure reducing valve, a pneumatic electromagnetic reversing valve and a multi-path gas distributor connected in sequence, wherein the multi-path gas distributor is connected with a plurality of paths, which are used to divide the gas in the gas tank into each path, and each path comprises a multi-path combined standard gas meter controller for adjusting the gas inlet angle, a high-precision standard gas meter for measuring the gas flow and a detected mine-used gas sensor connected in sequence.

[0006] The data processing main control module is electrically connected with the pneumatic electromagnetic reversing valve, the high-precision standard gas meter, the multi-path combined standard gas meter controller and the detected mine-used gas sensor.

[0007] Further, the data processing main control module adopts a chip IO pin to drive a triode, the triode drives an optical coupling isolation chip, and the optical coupling isolation chip drives a silicon controlled chip to drive the pneumatic reversing valve.

[0008] The data processing main control module controls the multi-channel combined standard gas meter controller through a standard industrial 4-20 mA signal.

[0009] Further, the data processing main control module is provided with a CAN communication unit and a 485 communication unit, which are used for communication connection with the detected mine gas sensor.

[0010] The industrial touch screen computer is further connected with a printing device for printing the test result.

[0011] Further, the test bench further comprises: a mounting frame and a detected sensor hanger, wherein the mounting frame is provided with a detected meter installation beam and a gas tank installation rack for placing a gas tank, and the detected mine gas sensor is installed on the detected meter installation beam through the detected sensor hanger.

[0012] The data processing main control module and the industrial touch screen computer are respectively installed on the mounting frame.

[0013] Further, the test bench further comprises:

[0014] A first meter pipe, the gas pipe is connected with the starting electromagnetic reversing valve through the first meter pipe and the pressure reducing valve;

[0015] A second meter pipe, the pneumatic electromagnetic reversing valve is connected to the multi-channel gas distributor through the second meter pipe;

[0016] A third meter pipe, the multi-channel gas distributor is connected to the multi-channel combined standard gas meter controller through the third meter pipe;

[0017] A fourth meter pipe, the multi-channel combined standard gas meter controller is connected to the corresponding high-precision standard gas meter through the fourth meter pipe;

[0018] A sensor connection gas pipe, the high-precision standard gas meter is connected to the corresponding detected mine gas sensor through the sensor connection gas pipe.

[0019] The application further discloses a mine gas sensor concentration automatic standard detection test method, which is based on the mine gas sensor concentration automatic standard detection test bench.

[0020] S1: control to open the pressure reducing valve and the pneumatic electromagnetic reversing valve;

[0021] S2: obtain a current flow value detected by the high-precision standard gas meter, and control the multi-channel combined standard gas meter controller based on the current flow value to realize stable flow control in the channel;

[0022] S3: compare the obtained sensor concentration value of the detected mine gas sensor with the input gas tank concentration value, calculate the error value and synchronize to the corresponding detected mine gas sensor;

[0023] S4: after the end of the calibration, close the pressure reducing valve and start the reversing valve.

[0024] Further, the step S1 comprises: inputting corresponding control instructions through an industrial touch screen computer to control the opening and closing of the electromagnetic reversing valve.

[0025] Further, the step S2 comprises: determining the output signal through the following expression to quickly adjust the multi-channel combined standard gas table controller to the corresponding position:

[0026] Y=(A* B* C* D / X) 0.95 ;

[0027] Wherein, A=0.95, B=1-1.3*(current flow value / 1000), C=0.5+(current flow value)*0.02, D=350, X= set flow value-current flow value, and the calculated Y value is the corresponding output analog voltage value.

[0028] Further, the step S3 comprises:

[0029] Based on a plurality of corresponding sensor concentration values and gas tank concentration values, the values of the coefficients a, b and c in the error correction expression are determined, and are transmitted to the corresponding detected mine gas sensor, and the error correction expression is:

[0030] Y=aX ² +bX+c;

[0031] Wherein, Y is the gas tank concentration value, and X is the sensor concentration value.

[0032] Further, the step S3 further comprises:

[0033] Based on the calculated error value and according to the range of the range, it is determined whether the detection accuracy is qualified.

[0034] The present application has at least the following beneficial effects:

[0035] The present application realizes rapid calibration and detection of the mine gas sensor through the interaction, calculation and control of the data processing main control module and the industrial touch screen computer, and through the control of the pneumatic electromagnetic reversing valve, the gas pipe and the detected mine gas sensor can be replaced safely and quickly. The present application does not need to use the remote controller necessary for the traditional technology, saves labor intensity, reduces working hours, and has the advantages of high control and calibration accuracy.

[0036] Other benefits of the present application will be described in detail in the specific embodiments section. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0038] Figure 1 is the overall structure schematic diagram of the test bench disclosed by the present application.

[0039] Figure 2 is the principle diagram of the test bench disclosed by the present application.

[0040] Among them, 1 is a gas tank, 2 is a pressure reducing valve, 3 is a first table pipe, 4 is a pneumatic electromagnetic reversing valve, 5 is a second table pipe, 6 is a multi-path gas distributor, 7 is a third table pipe, 8 is a multi-path combined standard gas table controller, 9 is an industrial touch screen computer, 10 is a fourth table pipe, 11 is a power supply control module, 12 is a high-precision standard gas table, 13 is a data processing main control module, 14 is a detected table installation beam, 15 is a sensor connecting gas pipe, 16 is a detected mine gas sensor, 17 is an installation frame, 18 is a detected sensor pendant, and 19 is a gas tank installation rack. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the scope of protection of the present application.

[0042] The present application discloses a kind of mine gas sensor concentration automatic mark detection test bench, including data processing main control module, industrial touch screen computer, and sequentially connected: gas tank, pressure reducing valve, pneumatic electromagnetic reversing valve, multi-path gas distributor, wherein, multi-path gas distributor is connected with several passages, for the gas of gas tank is divided into each passage, passage includes sequentially arranged: for adjusting the multi-path combined standard gas table controller of gas angle, for measuring the high-precision standard gas table of gas flow, detected mine gas sensor.Data processing main control module is electrically connected with pneumatic electromagnetic reversing valve, high-precision standard gas table, multi-path combined standard gas table controller, detected mine gas sensor.

[0043] Based on the test bench, the application further provides more preferred schemes, which are described in detail in Example One. Example

[0044] As shown in the mine gas sensor concentration automatic calibration test bench shown in Figure 1 and Figure 2 , the gas in the gas tank 1 is connected to the pneumatic electromagnetic reversing valve 4 through the first surface pipe 3 and the pressure reducing valve 2, and the gas tank 1 represents a gas concentration storage tank. The pressure reducing valve 2 has a pressure indicating structure, which can display the current output pressure of the gas tank 1. The output pressure can be adjusted by adjusting the valve knob of the pressure reducing valve 2, which can facilitate subsequent flow adjustment, limit pressure output and overpressure alarm. The pneumatic electromagnetic reversing valve 4 is connected to the multi-way gas distributor 6 through the second surface pipe 5, and is used to open and close the gas tank 1, which can facilitate batch replacement of the sensor without frequent manual closing of the pressure reducing valve 2. The multi-way gas distributor 6 is used to divide the gas in the gas tank 1 into four channels, and the third surface pipe 7 is connected to the multi-way combined standard gas meter controller 8. The multi-way combined standard gas meter controller 8 is mainly used to adjust the gas inlet angle and adjust the gas flow through proportional distribution, so as to realize stable standard 200mL / min flow control. In each channel, the multi-way combined standard gas meter controller 8 is connected to the high-precision standard gas meter 12 through the fourth surface pipe 10, and the high-precision standard gas meter 12 measures the current gas actual flow value. In order to realize stable 200mL / min gas flow, the multi-way combined standard gas meter controller 8 and the high-precision standard gas meter 12 need to realize closed-loop control and real-time flow adjustment. Each high-precision standard gas meter 12 is connected to the corresponding detected mine gas sensor 16 through the sensor connecting gas pipe 15. The gas tank 1 is placed in the gas tank mounting rack 19, and the detected mine gas sensor 16 is mounted on the detected table mounting beam 14 through the detected sensor hanging piece 18.

[0045] The industrial touch screen computer 9 is installed on the aluminum alloy mounting frame 17 through a rotary cantilever, which can realize multi-angle rotation. The power control module 11 and the data processing main control module 13 are installed on the mounting frame 17. The power control module 11 internally contains a switching power supply and a voltage stabilizing isolation module, which provides a stable voltage source for the system and the data processing main control module 13.

[0046] The data processing main control module 13 mainly comprises a data acquisition unit, a protocol conversion unit, a valve pipeline control unit and a core control unit, wherein the data acquisition unit is used for acquiring the flow data of the high-precision standard gas meter 12; the current actual measurement value of the detected mine gas sensor 16 is transmitted to the core control unit through the protocol conversion unit, and the actual analog quantity value is obtained through internal core closed loop calculation processing, and then the standard industrial level 4-20mA signal is output through the valve pipeline control unit to control the multi-channel combined standard gas meter controller 8 for valve angle adjustment. The protocol conversion module comprises a CAN communication unit and a 485 communication unit, which are used for realizing CAN communication and 485 communication mode conversion, and four-way detected mine gas sensors 16 can simultaneously communicate.

[0047] The valve pipeline control unit in the data processing main control module 13 controls the pneumatic electromagnetic reversing valve 4. The control mode of the relay is generally used in the market, the relay is prone to produce fire arc when it is in action, and is not suitable for use in flammable gas such as methane, and the relay also has mechanical action life, and the pneumatic electromagnetic reversing valve 4 needs to be frequently actuated in the calibration process. Therefore, the valve pipeline control unit in the data processing main control module 13 adopts a chip IO pin to drive a triode, the triode drives an optical coupling isolation chip, and then the optical coupling isolation chip drives a silicon controlled chip to drive the pneumatic electromagnetic reversing valve 4. The advantages are that no fire arc is produced when it is in action, and it is not affected by mechanical life, the switching frequency is high, and the quality is reliable.

[0048] The protocol conversion unit internally comprises four-way 485 communication units and two-way CAN isolation units, so that it can automatically identify the current 485 interface or CAN interface connected to the detected mine gas sensor through hardware data transmission.

[0049] The data acquisition unit and the valve pipeline control unit cooperate to control the multi-channel combined standard gas meter controller 8. The data acquisition unit adopts a 16-bit AD conversion chip AD7606, and uses a SPI bus high-speed communication with a core CPU to acquire the data of the high-precision standard gas meter 12, and obtains the corresponding output voltage value through processing and core calculation. Since the output voltage of the CPU is up to 3.3V, and the control signal is 4-20mA, the corresponding 4-20mA signal needs to be output through a non-inverting amplifier and a triode constant current control to control the multi-channel combined standard gas meter controller 8.

[0050] The industrial touch screen computer 9 can communicate with the data processing main control module 13, display the current flow value of the high-precision standard gas meter 12 and the current actual measurement value of the detected mine gas sensor 16, and is provided with an operation panel for inputting the gas tank concentration value, manually clicking the corresponding button to open / close the pneumatic electromagnetic reversing valve 4, switching the angle of the multi-path combined standard gas meter controller 8, inputting the timing time of the gas aeration in the calibration or detection process, the timing time being the aeration time of the detected mine gas sensor 16, and confirming the time according to the detection regulation or process, which is generally 5-10 minutes, and clicking the corresponding calibration or detection button according to the flow to realize automatic calibration and detection of the multiple paths of the same type of detected mine gas sensor 16 according to the preset conditions, automatic collection and saving of the calibration process data and other functions. The calibration and detection process can be displayed through the operation panel curve, and the calibration and detection data can be saved to the database for convenient browsing and printing.

[0051] The overall working process of the embodiment is as follows: after the detected mine gas sensors 16 are connected to the corresponding channels, the test bench is powered on, the appropriate gas pressure value is adjusted through the pressure reducing valve 2, the industrial touch screen computer 9 is operated to open the pneumatic electromagnetic reversing valve 4, the data processing main control module 13 collects the gas flow value in the test bench, the data processing main control module 13 automatically adjusts the flow of each channel to make it evenly distributed, the data processing main control module 13 automatically times the aeration time, the operator can input the gas tank concentration value on the industrial touch screen computer 9, the concentration value is displayed on the label of the gas tank 1, the detection data of the four detected mine gas sensors 16 is viewed, compared with the input gas tank concentration value, the error value is automatically calculated and communicated to the detected mine gas sensor 16, and the instrument value is corrected. After the calibration and detection are completed, the pneumatic reversing valve and the pressure reducing valve are closed to realize quick replacement of the gas cylinder and other operations.

[0052] The application further discloses a mine gas sensor concentration automatic calibration and detection test method, which adopts the mine gas sensor concentration automatic calibration and detection test bench.

[0053] S1: control to open the pressure reducing valve and the pneumatic electromagnetic reversing valve;

[0054] S2: acquire the current flow value detected by the high-precision standard gas meter, and control the multi-path combined standard gas meter controller based on the current flow value to realize stable flow control in the channel;

[0055] S3: compare the acquired sensor concentration value of the detected mine gas sensor with the input gas tank concentration value, calculate the error value and synchronize it to the corresponding detected mine gas sensor;

[0056] S4: after the calibration and detection are completed, close the pressure reducing valve and start the reversing valve.

[0057] Preferably, step S1 includes: inputting corresponding control commands through an industrial touch screen computer to control the opening and closing of the solenoid directional valve.

[0058] Step S2 includes: determining the output signal using the following expression, used to quickly adjust the multi-channel combined standard gas meter controller to the corresponding position:

[0059] Y = (A × B × C × D / X) 0.95 (1)

[0060] Where A=0.95, B=1-1.3×(current flow value / 1000), C=0.5+(current flow value)×0.02, D=350, X=set flow value-current flow value. For the power function 0.95 in expression (1), it can be judged according to the value of X. The smaller the value of X, the closer it is to 0. If oscillation occurs, the power function 0.95 can be adjusted to make it smaller. The adjustment range is 0.55~0.95, and the constant D is adjustable in the range of 350~850. The final calculated value of Y is the corresponding output analog voltage value, which forms a curved running trajectory with time.

[0061] For example, the flow rate (the stable gas flow rate expected to be achieved during the test) is set to 200 mL / min, the current flow rate is collected as 50 mL / min, and the parameters are determined as follows: A=0.95, B=0.935, C=1.5, D=350, X=150. Substituting these values ​​into the equation, we obtain expression (2):

[0062] Y = (0.95 × 0.935 × 1.5 × 350 / 150) 0.95 (2)

[0063] The calculated voltage Y value is 2.937V, therefore the output analog quantity is 2.937V. The circuit contains a high-precision resistor R = 250Ω. For the current value conversion, see expression (3):

[0064] Y / R=2.937V / 250Ω=11.748mA (3)

[0065] This controls the multi-channel combined standard gas meter controller of the test bench to rotate to the corresponding angle.

[0066] Step S3 includes:

[0067] Based on the sensor concentration value and the gas tank concentration value, Y=aX ² The values ​​of coefficients a, b, and c of the polynomial fitting of +bX+c are obtained and transmitted to the gas sensor used in the mine under test.

[0068] Step S3 further includes:

[0069] Based on the calculated error value, and according to the range of the range, the accuracy of the test is determined. Embodiment

[0070] For the control method used in the step S2, which is different from the commonly used PID algorithm, see the above expression (1), the final calculated Y value is a curve type running track, and the output signal can quickly adjust the multi-channel combination standard gas table controller to the corresponding position. The running standard controller adjusts the accuracy high first fast and then slow, without the need for overshoot return and oscillation adjustment like PID adjustment, saving adjustment time;

[0071] For the method used in the step S3, the standard concentration value and the current concentration value detected by the detected mine gas sensor 16 can be automatically recorded, and after a plurality of detection point records, the values of the coefficients a, b and c of the following expression (4) polynomial fitting are automatically generated:

[0072] Y=aX ² +bX+c (4)

[0073] Wherein, Y=aX ² +bX+c is a first-order quadratic equation, X is the current concentration value of the detected mine gas sensor (sensor concentration value), Y is the standard concentration value (gas tank concentration value), so that the values of X and Y are known, and the values of a, b and c are inversely deduced, which becomes a three-order linear equation. After being substituted by at least three detection records, and then being eliminated by addition and subtraction, the three-order linear equation is converted into a two-order linear equation, and then into a first-order linear equation, so that the values of a, b and c are obtained, which are transmitted to the detected mine gas sensor. The detected mine gas sensor corrects the current concentration error by using the values of a, b and c, and the automatic calibration is successful.

[0074] After calibration, the detected mine gas sensor needs to be tested whether it meets the accuracy, that is, it is qualified within the accuracy range. The test accuracy calculation expression is:

[0075] A=(Y-X) / Z×100% (5)

[0076] Wherein, Y is the current standard concentration value, X is the current concentration value of the detected mine gas sensor, and Z is the maximum value of the input range. The test accuracy is automatically calculated. If the calculation accuracy is within the known accuracy range, it is qualified, otherwise it is unqualified. It can also print output table.

[0077] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method for automatic calibration and detection of concentration of mine-used gas sensor, which is realized based on a test platform for automatic calibration and detection of concentration of mine-used gas sensor, characterized in that, The mine gas sensor concentration automatic calibration test bench comprises a data processing main control module, an industrial touch screen computer and, sequentially connected, a gas tank, a pressure reducing valve, a pneumatic electromagnetic reversing valve and a multi-path gas distributor, wherein the multi-path gas distributor is connected with a plurality of paths for equally distributing the gas in the gas tank to each path, and each path comprises, sequentially, a multi-path combined standard gas meter controller for adjusting the gas inlet angle, a high-precision standard gas meter for measuring the gas flow and a mine gas sensor to be detected; The data processing main control module is electrically connected with the pneumatic electromagnetic reversing valve, the high-precision standard gas meter, the multi-path combined standard gas meter controller and the mine gas sensor to be detected; The data processing main control module drives the triode with the chip IO pin, drives the optocoupler isolation chip with the triode, and drives the thyristor chip with the optocoupler isolation chip to drive the pneumatic reversing valve; The data processing main control module controls the multi-path combined standard gas meter controller through the standard industrial 4-20mA signal; The test method comprises: S1: controlling to open the pressure reducing valve and the pneumatic electromagnetic reversing valve; S2: obtaining the current flow value detected by the high-precision standard gas meter, and controlling the multi-path combined standard gas meter controller based on the current flow value to realize stable flow control in the path; the output signal is determined by the following expression to quickly adjust the multi-path combined standard gas meter controller to the corresponding position: Y = (A x B C x D) / X 0.95 ; Wherein, A = 0.95, B = 1-1.3×(current flow value / 1000), C = 0.5+(current flow value)×0.02, D = 350, X = set flow value-current flow value, and the calculated Y value is the corresponding output analog voltage value; The calculated Y value is a curve type operation track, and the output signal can quickly adjust the multi-path combined standard gas meter controller to the corresponding position, and the running standard controller adjusts the accuracy first fast and then slow; S3: comparing the obtained sensor concentration value of the mine gas sensor to be detected with the input gas tank concentration value, calculating the error value and synchronizing to the corresponding mine gas sensor to be detected; based on a plurality of corresponding sensor concentration values and gas tank concentration values, the values of the coefficients a, b and c in the error correction expression are determined and transmitted to the corresponding mine gas sensor to be detected, and the error correction expression is: Y = aX² + bX + c; Wherein, Y is the gas tank concentration value, and X is the sensor concentration value; Y = aX² + bX + c is a quadratic equation, the values of X and Y are known, the values of a, b and c are inversely deduced, which becomes a linear equation with three unknowns, and the equation is converted into a linear equation with two unknowns and then a linear equation with one unknown by substituting at least three detection record points and then eliminating, so that the values of a, b and c are calculated, transmitted to the mine gas sensor to be detected, and the mine gas sensor to be detected corrects the current concentration error by using the values of a, b and c, and the automatic calibration is successful. After calibration, the tested mine gas sensor needs to be tested whether it meets the precision, that is, it is qualified within the precision range. The test precision calculation expression is: A=(Y-X) / Z*100%; wherein, Y is the current standard concentration value, X is the current concentration value of the tested mine gas sensor, and Z is the maximum value of the input range. The test precision is automatically calculated. If the calculated precision is within the known precision range, it is qualified, otherwise, it is unqualified. S4: After the calibration, the pressure reducing valve is closed and the reversing valve is started.

2. The mine gas sensor concentration automatic calibration test method according to claim 1, characterized in that, The data processing main control module is provided with a CAN communication unit and a 485 communication unit, which are used for communication connection with the tested mine gas sensor. The industrial touch screen computer is further connected with a printing device, which is used for printing the test results.

3. The mine gas sensor concentration automatic calibration test method according to claim 1, characterized in that, Further comprising: The installation frame is provided with a tested meter installation beam and a gas tank installation rack for placing the gas tank, and the tested mine gas sensor is installed on the tested meter installation beam through the tested sensor hanging piece; The data processing main control module and the industrial touch screen computer are respectively installed on the installation frame.

4. The mine gas sensor concentration automatic calibration test method according to claim 1, characterized in that, The test bench further comprises: The first meter pipe, the gas pipe is connected with the starting electromagnetic reversing valve through the first meter pipe and the pressure reducing valve; The second meter pipe, the pneumatic electromagnetic reversing valve is connected to the multi-way gas distributor through the second meter pipe; The third meter pipe, the multi-way gas distributor is connected to the multi-way combined standard gas meter controller through the third meter pipe; The fourth meter pipe, the multi-way combined standard gas meter controller is connected to the corresponding high-precision standard gas meter through the fourth meter pipe; The sensor connection gas pipe, the high-precision standard gas meter is connected to the corresponding tested mine gas sensor through the sensor connection gas pipe.

5. The method of claim 1, wherein the method is a method of automatically marking and checking a test of a gas sensor concentration for a mine, characterized by, The step S1 comprises: The opening and closing of the starting electromagnetic reversing valve is controlled by inputting corresponding control instructions through the industrial touch screen computer.

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