CN116539819B - Sensor working channel and mode selection control system and method of gas detector - Google Patents

Sensor working channel and mode selection control system and method of gas detector Download PDF

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Publication number
CN116539819B
CN116539819B CN202310815802.7A CN202310815802A CN116539819B CN 116539819 B CN116539819 B CN 116539819B CN 202310815802 A CN202310815802 A CN 202310815802A CN 116539819 B CN116539819 B CN 116539819B
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gas
normally
gas sensor
sensor
relay
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CN116539819A (en
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刘玉东
赵文
李�杰
陈亮
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Guangzhou Inlan Electronic Technology Co ltd
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Guangzhou Inlan Electronic Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0022—General constructional details of gas analysers, e.g. portable test equipment using a number of analysing channels
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0031—General constructional details of gas analysers, e.g. portable test equipment concerning the detector comprising two or more sensors, e.g. a sensor array
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0073—Control unit therefor

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
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  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

The invention discloses a sensor working channel and a mode selection control system of a gas detector, which comprise a first three-way electromagnetic valve, a second three-way electromagnetic valve, a two-way electromagnetic valve, a first normally closed relay, a second normally closed relay, a first normally open relay, a second normally open relay, a first connecting piece, a second connecting piece, a first gas sensor, a second gas sensor, a sampling pump and a control unit; the first normally closed relay, the second normally closed relay, the first normally open relay, the second normally open relay, the first gas sensor, the second gas sensor and the sampling pump are all connected with the control unit, and the control unit controls the power-on/power-off states of the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay to select a sensor working channel and a sensor working mode. The invention also discloses a sensor working channel of the gas detector and a mode selection control method.

Description

Sensor working channel and mode selection control system and method of gas detector
Technical Field
The invention relates to the technical field of gas detection, in particular to a sensor working channel of a gas detector, a mode selection control system and a mode selection control method.
Background
The existing common system for measuring the gas generally realizes the detection of the gas by arranging an independent gas detection system on a gas channel of a gas measuring instrument, and the detection of the gas of a plurality of gas channels exists at present, but the plurality of gas channels needing to be detected are arranged independently, so that the detection cost is increased, and the occupied space of the whole system is increased.
Disclosure of Invention
The invention aims to provide a sensor working channel of a gas detector, a mode selection control system and a mode selection control method, which can effectively solve the technical problems in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a sensor working channel and a mode selection control system of a gas detector, including a first three-way electromagnetic valve, a second three-way electromagnetic valve, a two-way electromagnetic valve, a first normally closed relay, a second normally closed relay, a first normally open relay, a second normally open relay, a first connecting piece, a second connecting piece, a first gas sensor, a second gas sensor, a sampling pump, and a control unit; the first connector of the first three-way electromagnetic valve is connected with the output end of the first normally-closed relay, the second connector of the first three-way electromagnetic valve is connected with the output end of the first normally-open relay, and the third connector of the first three-way electromagnetic valve is connected with the input end of the first connecting piece; the first connector of the second three-way electromagnetic valve is connected with the output end of the second normally-closed relay, the second connector of the second three-way electromagnetic valve is connected with the output end of the second normally-open relay, and the third connector of the second three-way electromagnetic valve is connected with the input end of the second connecting piece; the input end of the first normally closed relay and the input end of the second normally closed relay are connected with a first gas input port; the input end of the first normally open relay and the input end of the second normally open relay are both connected with the output end of the two-way electromagnetic valve, and the input end of the two-way electromagnetic valve is connected with the second gas input port; the output end of the first connecting piece is connected with the input end of the sampling pump, and the output end of the second connecting piece is connected with the input end of the sampling pump through the second gas sensor; the output end of the sampling pump is connected with a gas output port through the first gas sensor; the first gas input port is used for inputting gas to be detected, and the second gas input port is used for inputting purified gas; the first normally closed relay, the second normally closed relay, the first normally open relay, the second normally open relay, the first gas sensor, the second gas sensor and the sampling pump are all connected with the control unit, and the control unit controls the power-on/power-off states of the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay to select a sensor working channel and a mode, and the sensor working channel comprises:
When the first gas sensor is selected to work independently and is in a detection mode, setting the detection value of the second gas sensor to be null through the control unit, controlling only the second normally-closed relay to be in an electrified state through the control unit, so that only a first detection channel among the first normally-closed relay, the first three-way electromagnetic valve and the first connecting piece is conducted, and outputting the gas to be detected, which is input by the first gas input port, through the first detection channel conducted among the first normally-closed relay, the first three-way electromagnetic valve and the first connecting piece in sequence and through the sampling pump and the first gas sensor;
when the first gas sensor is selected to work independently and is in a purging mode, the control unit controls only the second normally-open relay to be in a power-off state, so that only a first purging channel among the first normally-open relay, the first three-way electromagnetic valve and the first connecting piece is conducted, and purified gas input by the second gas input port and passing through the two-way electromagnetic valve sequentially passes through the first purging channel conducted among the first normally-open relay, the first three-way electromagnetic valve and the first connecting piece, passes through the sampling pump and the first gas sensor and then is output by the gas output port;
When the second gas sensor is selected to work independently and is in a detection mode, setting the detection value of the first gas sensor to be null through the control unit, controlling only the first normally-closed relay to be in an electrified state through the control unit, thereby only conducting a second detection channel among the second normally-closed relay, the second three-way electromagnetic valve and the second connecting piece, and outputting the gas to be detected, which is input by the first gas input port, through the second detection channel conducted among the second normally-closed relay, the second three-way electromagnetic valve and the second connecting piece in sequence and through the second gas sensor, the sampling pump and the first gas sensor;
when the second gas sensor is selected to work independently and is in a purging mode, the control unit controls only the first normally-open relay to be in a power-off state, so that only a second purging channel among the second normally-open relay, the second three-way electromagnetic valve and the second connecting piece is conducted, and purified gas input by the second gas input port and passing through the two-way electromagnetic valve sequentially passes through the second purging channel conducted among the second normally-open relay, the second three-way electromagnetic valve and the second connecting piece and is output by the gas output port after passing through the second gas sensor, the sampling pump and the first gas sensor;
When a first gas sensor and a second gas sensor are selected to work simultaneously and are in a detection mode, the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay are controlled by the control unit to be in a power-off state, so that the first detection channel and the second detection channel are conducted, gas to be detected input by the first gas input port is split into the first detection channel and the second detection channel, and the gas to be detected output by the second detection channel is converged with the gas to be detected output by the first detection channel after passing through the second gas sensor and is output by the gas output port after passing through the sampling pump and the first gas sensor;
when the first gas sensor and the second gas sensor are selected to work simultaneously and are in a purging mode, the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay are controlled by the control unit to be in an electrified state, so that the first purging channel and the second purging channel are conducted, purified gas input by the second gas input port is shunted through the first purging channel and the second purging channel, and purified gas output by the second purging channel is converged with purified gas output by the first purging channel after passing through the second gas sensor and is output by the gas output port after passing through the sampling pump and the first gas sensor.
Preferably, the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay are all time relays; the control unit controls the time periods of power on/off of the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay according to the preset working periods of the detection mode and the purging mode of the first gas sensor and the second gas sensor, so that the detection mode and the purging mode of the first gas sensor and the second gas sensor during independent/simultaneous working can be circularly and uninterruptedly executed.
Preferably, the preset working period of the detection mode of the first gas sensor and the second gas sensor is 50s-200s, the preset working period of the purge mode of the first gas sensor and the second gas sensor is 10s-50s, and the preset working period of the detection mode of the first gas sensor and the second gas sensor is larger than the working period of the purge mode.
Preferably, the sensor working channel and mode selection control system of the gas detector further comprises a temperature sensor and a display, wherein the temperature sensor and the display are connected with the control unit, and the control unit corrects the gas data detected by the first gas sensor and/or the second gas sensor according to the temperature data detected by the temperature sensor, and then obtains corrected gas data and displays the corrected gas data through the display; the data correction processing comprises a calculation process of a formula (1) to a formula (3):
Y1=AX 3 +BX 2 +CX+D formula (1)
Wherein, the formula (1) is a linear correlation function, X is gas data obtained by detection of the first gas sensor and/or the second gas sensor, A, B, C and D are linear correlation coefficients, A, B, C and D are obtained in advance after linear fitting standard operation is performed on the gas sensors through a standard based on different types of gas sensors; y1 is the linear correlation corrected gas data obtained by the calculation of the formula (1);
y2=ky1+b formula (2)
Wherein, the formula (2) is a piecewise broken line function, the coefficient k and the constant b are obtained through preset, and Y2 is the gas data after the piecewise broken line processing obtained through the calculation of the formula (2);
y=y2×t/(t+t') formula (3)
Wherein, formula (3) is a temperature influence correction function, T is temperature data detected by the temperature sensor, T' is absolute temperature, and Y is corrected gas data calculated by formula (3) and displayed by the display.
Preferably, the first gas sensor and the second gas sensor are respectively used for detecting the concentration of specific gas or the density of residual gas in the gas to be detected; wherein the purifying gas is air or nitrogen.
The embodiment of the invention correspondingly provides a sensor working channel and a mode selection control method of a gas detector, wherein the gas detector comprises a first three-way electromagnetic valve, a second three-way electromagnetic valve, a two-way electromagnetic valve, a first normally closed relay, a second normally closed relay, a first normally open relay, a second normally open relay, a first connecting piece, a second connecting piece, a first gas sensor, a second gas sensor, a sampling pump and a control unit; the first connector of the first three-way electromagnetic valve is connected with the output end of the first normally-closed relay, the second connector of the first three-way electromagnetic valve is connected with the output end of the first normally-open relay, and the third connector of the first three-way electromagnetic valve is connected with the input end of the first connecting piece; the first connector of the second three-way electromagnetic valve is connected with the output end of the second normally-closed relay, the second connector of the second three-way electromagnetic valve is connected with the output end of the second normally-open relay, and the third connector of the second three-way electromagnetic valve is connected with the input end of the second connecting piece; the input end of the first normally closed relay and the input end of the second normally closed relay are connected with a first gas input port; the input end of the first normally open relay and the input end of the second normally open relay are both connected with the output end of the two-way electromagnetic valve, and the input end of the two-way electromagnetic valve is connected with the second gas input port; the output end of the first connecting piece is connected with the input end of the sampling pump, and the output end of the second connecting piece is connected with the input end of the sampling pump through the second gas sensor; the output end of the sampling pump is connected with a gas output port through the first gas sensor; the first gas input port is used for inputting gas to be detected, and the second gas input port is used for inputting purified gas; the first normally closed relay, the second normally closed relay, the first normally open relay, the second normally open relay, the first gas sensor, the second gas sensor and the sampling pump are all connected with the control unit, and the control unit controls the power-on/power-off states of the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay to select a sensor working channel and a mode; the sensor working channel and mode selection control method comprises the following steps:
When the first gas sensor is selected to work independently and is in a detection mode, setting the detection value of the second gas sensor to be null through the control unit, controlling only the second normally-closed relay to be in an electrified state through the control unit, so that only a first detection channel among the first normally-closed relay, the first three-way electromagnetic valve and the first connecting piece is conducted, and outputting the gas to be detected, which is input by the first gas input port, through the first detection channel conducted among the first normally-closed relay, the first three-way electromagnetic valve and the first connecting piece in sequence and through the sampling pump and the first gas sensor;
when the first gas sensor is selected to work independently and is in a purging mode, the control unit controls only the second normally-open relay to be in a power-off state, so that only a first purging channel among the first normally-open relay, the first three-way electromagnetic valve and the first connecting piece is conducted, and purified gas input by the second gas input port and passing through the two-way electromagnetic valve sequentially passes through the first purging channel conducted among the first normally-open relay, the first three-way electromagnetic valve and the first connecting piece, passes through the sampling pump and the first gas sensor and then is output by the gas output port;
When the second gas sensor is selected to work independently and is in a detection mode, setting the detection value of the first gas sensor to be null through the control unit, controlling only the first normally-closed relay to be in an electrified state through the control unit, thereby only conducting a second detection channel among the second normally-closed relay, the second three-way electromagnetic valve and the second connecting piece, and outputting the gas to be detected, which is input by the first gas input port, through the second detection channel conducted among the second normally-closed relay, the second three-way electromagnetic valve and the second connecting piece in sequence and through the second gas sensor, the sampling pump and the first gas sensor;
when the second gas sensor is selected to work independently and is in a purging mode, the control unit controls only the first normally-open relay to be in a power-off state, so that only a second purging channel among the second normally-open relay, the second three-way electromagnetic valve and the second connecting piece is conducted, and purified gas input by the second gas input port and passing through the two-way electromagnetic valve sequentially passes through the second purging channel conducted among the second normally-open relay, the second three-way electromagnetic valve and the second connecting piece and is output by the gas output port after passing through the second gas sensor, the sampling pump and the first gas sensor;
When a first gas sensor and a second gas sensor are selected to work simultaneously and are in a detection mode, the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay are controlled by the control unit to be in a power-off state, so that the first detection channel and the second detection channel are conducted, gas to be detected input by the first gas input port is split into the first detection channel and the second detection channel, and the gas to be detected output by the second detection channel is converged with the gas to be detected output by the first detection channel after passing through the second gas sensor and is output by the gas output port after passing through the sampling pump and the first gas sensor;
when the first gas sensor and the second gas sensor are selected to work simultaneously and are in a purging mode, the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay are controlled by the control unit to be in an electrified state, so that the first purging channel and the second purging channel are conducted, purified gas input by the second gas input port is shunted through the first purging channel and the second purging channel, and purified gas output by the second purging channel is converged with purified gas output by the first purging channel after passing through the second gas sensor and is output by the gas output port after passing through the sampling pump and the first gas sensor.
Preferably, the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay are all time relays; the control unit controls the time periods of power on/off of the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay according to the preset working periods of the detection mode and the purging mode of the first gas sensor and the second gas sensor, so that the detection mode and the purging mode of the first gas sensor and the second gas sensor during independent/simultaneous working can be circularly and uninterruptedly executed.
Preferably, the preset working period of the detection mode of the first gas sensor and the second gas sensor is 50s-200s, the preset working period of the purge mode of the first gas sensor and the second gas sensor is 10s-50s, and the preset working period of the detection mode of the first gas sensor and the second gas sensor is larger than the working period of the purge mode.
Preferably, the gas detector further comprises a temperature sensor and a display connected with the control unit, and the sensor working channel and mode selection control method further comprises the steps of:
The control unit corrects the gas data detected by the first gas sensor and/or the second gas sensor according to the temperature data detected by the temperature sensor to obtain corrected gas data, and displays the corrected gas data through the display; the data correction processing comprises a calculation process of a formula (1) to a formula (3):
Y1=AX 3 +BX 2 +CX+D formula (1)
Wherein, the formula (1) is a linear correlation function, X is gas data obtained by detection of the first gas sensor and/or the second gas sensor, A, B, C and D are linear correlation coefficients, A, B, C and D are obtained in advance after linear fitting standard operation is performed on the gas sensors through a standard based on different types of gas sensors; y1 is the linear correlation corrected gas data obtained by the calculation of the formula (1);
y2=ky1+b formula (2)
Wherein, the formula (2) is a piecewise broken line function, the coefficient k and the constant b are obtained through preset, and Y2 is the gas data after the piecewise broken line processing obtained through the calculation of the formula (2);
y=y2×t/(t+t') formula (3)
Wherein, formula (3) is a temperature influence correction function, T is temperature data detected by the temperature sensor, T' is absolute temperature, and Y is corrected gas data calculated by formula (3) and displayed by the display.
Preferably, the first gas sensor and the second gas sensor are respectively used for detecting the concentration of specific gas or the density of residual gas in the gas to be detected; wherein the purifying gas is air or nitrogen.
Compared with the prior art, the sensor working channel and mode selection control system and method of the gas detector provided by the embodiment of the invention have the following technical effects: 1. the first three-way electromagnetic valve, the second three-way electromagnetic valve, the two-way electromagnetic valve, the first normally-closed relay, the second normally-closed relay, the first normally-open relay and the second normally-open relay are introduced, the first normally-closed relay, the second normally-closed relay, the first normally-open relay and the second normally-open relay are controlled by the control unit to be in a detection mode or a purging mode when the first gas sensor and the second gas sensor are independently or simultaneously operated, and the first gas sensor and the second gas sensor are controlled to be in independent or simultaneous operation, so that different gas sensors can be connected according to different gas detection requirements, and a single channel or two channels can be selected to be simultaneously detected. 2. The first gas sensor and the second gas sensor are arranged to work independently/simultaneously and comprise a detection mode and a purging mode, and the detection mode and the purging mode are circularly and alternately carried out, so that the influence on the detection sensitivity of the first gas sensor and the second gas sensor due to the fact that the first gas sensor and the second gas sensor are always in the working mode of the detection mode and are in a fixed concentration for a long time can be avoided, and air or nitrogen is input through the purging mode to activate the sensor, so that the sensitivity and the service life of the sensor are improved. 3. Through setting up first normally closed relay, second normally closed relay, first normally open relay and second normally open relay are time relay, like this the control unit is according to the detection mode of the first gas sensor of advance setting, second gas sensor and the duty cycle of sweeping the mode come control first normally closed relay, second normally closed relay, first normally open relay and second normally open relay's circular telegram/time cycle of outage to guarantee detection mode and the sweep mode of first gas sensor and second gas sensor when alone/simultaneous working can circulate incessantly to be carried out. 4. By introducing temperature data detected by a temperature sensor, the control unit detects the temperature data obtained by the temperature sensor, and the gas data obtained by the first gas sensor and/or the second gas sensor are subjected to data correction processing including linear correlation correction, segmentation fold line processing and temperature influence correction, and then the corrected gas data are displayed by the display, so that the accuracy of the gas detection data can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a sensor working channel and a mode selection control system of a gas detector according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a linear correlation equation after performing primary fitting and secondary fitting on 5 sets of data of a target gas concentration value and a detection value obtained by detecting the target gas by the instrument when implementing a sensor working channel and a mode selection control system of a gas detector provided by an embodiment of the invention.
FIG. 3 is a line graph of a sensor operating channel and a mode selection control system of a gas detector according to an embodiment of the present invention obtained by segmenting data.
Fig. 4 is a line graph under a first segment from the line graph shown in fig. 3.
Fig. 5 is a line graph under a second segment taken from the line graph shown in fig. 3.
Fig. 6 is a line graph under a third segment from the line graph shown in fig. 3.
Fig. 7 is a line graph under a fourth segment from the line graph shown in fig. 3.
Fig. 8 is a line graph under a fifth segment from the line graph shown in fig. 3.
Fig. 9 is a schematic flow chart of a sensor working channel and a mode selection control method of a gas detector according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in 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 configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may communicate with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1, an embodiment of the present invention provides a sensor operating channel and a mode selection control system of a gas detector, which includes a first three-way solenoid valve 10, a second three-way solenoid valve 20, a two-way solenoid valve 30, a first normally closed relay 11, a second normally closed relay 21, a first normally open relay 12, a second normally open relay 22, a first connection 13, a second connection 23, a first gas sensor 100, a second gas sensor 200, a sampling pump 40, and a control unit 50.
The first connector of the first three-way electromagnetic valve 10 is connected with the output end of the first normally-closed relay 11, the second connector of the first three-way electromagnetic valve 10 is connected with the output end of the first normally-open relay 12, and the third connector of the first three-way electromagnetic valve 10 is connected with the input end of the first connecting piece 13.
The first connector of the second three-way electromagnetic valve 20 is connected with the output end of the second normally-closed relay 21, the second connector of the second three-way electromagnetic valve 20 is connected with the output end of the second normally-open relay 22, and the third connector of the second three-way electromagnetic valve 20 is connected with the input end of the second connecting piece 23.
The input end of the first normally closed relay 11 and the input end of the second normally closed relay 21 are both connected with the first gas input port 101. The input end of the first normally open relay 12 and the input end of the second normally open relay 22 are both connected with the output end of the two-way electromagnetic valve 30, and the input end of the two-way electromagnetic valve 30 is connected with the second gas input port 102.
The output end of the first connecting piece 13 is connected with the input end of the sampling pump 40, and the output end of the second connecting piece 23 is connected with the input end of the sampling pump 40 through the second gas sensor 200. The output end of the sampling pump 40 is connected to a gas output 103 via the first gas sensor 100.
The first gas input 101 is used for inputting a gas to be detected, and the second gas input 102 is used for inputting a purge gas. It will be appreciated that purge gas is used as a target input to activate the first gas sensor 100 and the second gas sensor 200 to restore their sensitivity in the purge mode of the first gas sensor 100 and the second gas sensor 200. Therefore, the purge gas needs to be specifically selected according to the types of the first gas sensor 100 and the second gas sensor 200 employed, and for example, air or nitrogen may be employed, which is not specifically limited herein.
The first normally closed relay 11, the second normally closed relay 21, the first normally open relay 12, the second normally open relay 22, the first gas sensor 100, the second gas sensor 200, and the sampling pump 40 are all connected to the control unit 50, and the control unit 50 controls the power on/off states of the first normally closed relay 11, the second normally closed relay 21, the first normally open relay 12, and the second normally open relay 22 to select a sensor operation channel and a mode, including:
when the first gas sensor 100 is selected to work alone and is in the detection mode, the detection value of the second gas sensor 200 is set to be null through the control unit 50, and only the second normally-closed relay 21 is controlled to be in an electrified state through the control unit 50, so that only a first detection channel (as shown by an arrow A1 direction in fig. 1) among the first normally-closed relay 11, the first three-way electromagnetic valve 10 and the first connecting piece 13 is conducted, and the gas to be detected input by the first gas input port 101 sequentially passes through the first detection channel conducted among the first normally-closed relay 11, the first three-way electromagnetic valve 10 and the first connecting piece 13 and is output by the gas output port 103 after passing through the sampling pump 40 and the first gas sensor 100;
When the first gas sensor 100 is selected to operate independently and is in the purge mode, only the second normally open relay 22 is controlled by the control unit 50 to be in a power-off state, so that only a first purge channel (as shown by an arrow B1 in fig. 1) among the first normally open relay 12, the first three-way electromagnetic valve 10 and the first connector 13 is conducted, and the purge gas inputted from the second gas input port 102 and passing through the two-way electromagnetic valve 30 sequentially passes through the first purge channel conducted among the first normally open relay 12, the first three-way electromagnetic valve 10 and the first connector 13 and is outputted from the gas output port 103 after passing through the sampling pump 40 and the first gas sensor 100;
when the second gas sensor 200 is selected to operate alone and is in the detection mode, setting the detection value of the first gas sensor 100 to be null by the control unit 50, and controlling only the first normally-closed relay 11 to be in the energized state by the control unit 50, so as to conduct only the second detection channel (as shown by arrow A2 in fig. 1) between the second normally-closed relay 21, the second three-way electromagnetic valve 20 and the second connecting member 23, and outputting the gas to be detected inputted from the first gas input port 101 through the second detection channel conducted between the second normally-closed relay 21, the second three-way electromagnetic valve 20 and the second connecting member 23 in sequence and through the second gas sensor 200, the sampling pump 40 and the first gas sensor 100 and then through the gas output port 103;
When the second gas sensor 200 is selected to operate alone and is in the purge mode, only the first normally open relay 12 is controlled to be in the power-off state by the control unit 50, so that only the second purge passage (as shown by an arrow B2 in fig. 1) among the second normally open relay 22, the second three-way electromagnetic valve 20 and the second connection member 23 is conducted, and the purge gas inputted from the second gas input port 102 and passing through the two-way electromagnetic valve 30 sequentially passes through the second purge passage conducted among the second normally open relay 22, the second three-way electromagnetic valve 20 and the second connection member 23 and is outputted from the gas output port 103 after passing through the second gas sensor 200, the sampling pump 40 and the first gas sensor 100;
when the first gas sensor 100 and the second gas sensor 200 are selected to operate simultaneously and are in a detection mode, the control unit 50 controls the first normally closed relay 11, the second normally closed relay 21, the first normally open relay 12 and the second normally open relay 22 to be in a power-off state, so that the first detection channel (as shown by an arrow A1 direction in fig. 1) and the second detection channel (as shown by an arrow A2 direction in fig. 1) are conducted, the gas to be detected input by the first gas input port 101 is split into the first detection channel and the second detection channel, and the gas to be detected output by the second detection channel is combined with the gas to be detected output by the first detection channel after passing through the second gas sensor 200 and is output by the gas output port 103 after passing through the sampling pump 40 and the first gas sensor 100;
When the first gas sensor 100 and the second gas sensor 200 are selected to operate simultaneously and are in the purge mode, the control unit 50 controls the first normally closed relay 11, the second normally closed relay 21, the first normally open relay 12 and the second normally open relay 22 to be in the energized state, so that the first purge channel (as shown by an arrow B1 direction in fig. 1) and the second purge channel (as shown by an arrow B2 direction in fig. 1) are conducted, the purge gas input from the second gas input port 102 is split through the first purge channel and the second purge channel, and the purge gas output from the second purge channel is merged with the purge gas output from the first purge channel after passing through the second gas sensor 200 and is output from the gas output port 103 after passing through the sampling pump 40 and the first gas sensor 100.
It will be appreciated that in this embodiment, the sampling pump 40 is used to: in the detection mode, the gas to be detected input from the first gas input port 101 is sucked in to accelerate the gas to be detected to be effectively detected and analyzed by the sensor, and finally output from the gas output port 103. In the purge mode, the purge gas input from the second gas input port 102 is sucked in to accelerate the cleaning (i.e. the removal of the detection target gas) through the sensor, and is finally output from the gas output port 103.
Therefore, the embodiment of the invention controls the first normally closed relay, the second normally closed relay, the first normally open relay, the second normally open relay and the first gas sensor and the second gas sensor to work independently or simultaneously and controls the first gas sensor and the second gas sensor to work independently or simultaneously to be in a detection mode or a purging mode when the first gas sensor and the second gas sensor work independently or simultaneously by introducing the first three-way electromagnetic valve, the second three-way electromagnetic valve, the two-way electromagnetic valve, the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay and controlling the power-on/power-off state of the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay through the control unit, so that different gas sensors can be connected according to different gas detection requirements and a single channel or two channels can be selected for detection simultaneously. In addition, the first gas sensor and the second gas sensor are arranged to work independently/simultaneously and comprise a detection mode and a purging mode, and the detection mode and the purging mode are circularly and alternately carried out, so that the influence on the detection sensitivity of the first gas sensor and the second gas sensor due to the fact that the gas is in a fixed concentration for a long time in the working mode of the detection mode all the time can be avoided, and air or nitrogen is input through the purging mode to activate the sensor, so that the sensitivity and the service life of the sensor are improved.
Further, as a modification of the present embodiment, the first normally-closed relay 11, the second normally-closed relay 21, the first normally-open relay 12, and the second normally-open relay 22 are all time relays. The control unit 50 controls the time periods of the energization/de-energization of the first normally closed relay 11, the second normally closed relay 21, the first normally open relay 12 and the second normally open relay 22 according to the preset operation periods of the detection mode and the purge mode of the first gas sensor 100 and the second gas sensor 200, thereby ensuring that the detection mode and the purge mode of the first gas sensor 100 and the second gas sensor 200 can be cyclically performed without interruption when they are operated separately/simultaneously.
The preset working period of the detection mode of the first gas sensor 100 and the second gas sensor 200 is 50s-200s, the preset working period of the purge mode of the first gas sensor 100 and the second gas sensor 200 is 10s-50s, and the preset working period of the detection mode of the first gas sensor 100 and the second gas sensor 200 is larger than the working period of the purge mode. For example, as a preferred embodiment, the preset duty cycle of the detection mode of the first gas sensor 100, the second gas sensor 200 is 100s, and the preset duty cycle of the purge mode of the first gas sensor 100, the second gas sensor 200 is 30s. In this way, it is possible to ensure that the detection mode and the purge mode of the first gas sensor 100 and the second gas sensor 200 when they are operated individually/simultaneously are cyclically performed without interruption for a preset operation period.
Further, with continued reference to fig. 1, as a preferred embodiment, the sensor working channel and mode selection control system of the gas detector further includes a temperature sensor 300 and a display 60 connected to the control unit 50, where the control unit 50 corrects the gas data detected by the first gas sensor 100 and/or the second gas sensor 200 according to the temperature data detected by the temperature sensor 300, and then obtains corrected gas data and displays the corrected gas data through the display 60; the data correction processing comprises a calculation process of a formula (1) to a formula (3).
Y1=AX 3 +BX 2 +CX+D formula (1)
Wherein, the formula (1) is a linear correlation function, X is gas data obtained by detection of the first gas sensor and/or the second gas sensor, A, B, C and D are linear correlation coefficients, A, B, C and D are obtained in advance after linear fitting standard operation is performed on the gas sensors through a standard based on different types of gas sensors; y1 is the linear correlation corrected gas data calculated by the formula (1). In the specific implementation, the target gas concentration value and the detection value obtained by detecting the target gas by the instrument are a group of data, and a plurality of groups of data can be obtained by repeating the operation. For example, the target gas concentration value and the detection value obtained by detecting the target gas by the instrument are taken as a group of data sets, 5 groups of data can be obtained by repeating the operation, and the result obtained after one fitting is shown in table 1:
TABLE 1
The second fitting was performed on the basis of the first fitting, and the results are shown in table 2:
TABLE 2
For example, in conjunction with FIG. 2, FIG. 2 is a graph of a linear correlation coefficient profile obtained according to Table 2, in which the x-axis is the raw output value of the first gas sensor and/or the second gas sensor detected at a concentration, the y-axis is the standard gas concentration value, and the units of the x-axis and the y-axis may be g/m 3 In this fig. 2, the linear correlation function is as follows:
y = 0.00000000 x 3 - 0.00000003 x 2 + 0.01049884 x + 0.10453440
R 2 = 0.99997936
wherein y= 0.00000000 x 3 - 0.00000003 x 2 + 0.01049884 x + 0.10453440 is a linear regression equation, and is mainly used for judging the fitting effect between the sensor detection value and the standard gas concentration, wherein the R value is a judgment coefficient, which is an estimated regression equation fitting degree measurement, and generally, the closer R is to 1, the better the fitting degree is. The coefficients are also called determinable coefficients or determinable coefficientsBy number, it is meant that in linear regression, the ratio of the sum of squares of the regression to the sum of squares of the total dispersion is equal to the square of the correlation coefficient. It is a measure of goodness of fit to the estimated regression equation. The sensor with R larger than or equal to 0.99 can be used for analyzing the gas.
Y2=ky1+b formula (2)
Wherein, the formula (2) is a piecewise broken line function, the coefficient k and the constant b are obtained through preset, and Y2 is the gas data after the piecewise broken line processing obtained through the calculation of the formula (2); in the specific implementation, the target gas concentration value and the detection value obtained by detecting the target gas by the instrument are a group of data, and a plurality of groups of data can be obtained by repeating the operation. And displaying the data according to the groups in a broken line chart mode to obtain a segmented broken line graph, wherein the segments with similar slopes can be combined into a broken line. The group of data corresponding to each broken line can be displayed in a broken line chart mode independently, and k and b values can be obtained by clicking the broken line adding formula.
For example, in the example, the target gas concentration value and the detection value obtained by detecting the target gas by the instrument are taken as a group of data sets, 5 groups of data can be obtained by repeating the operation, and the data subjected to primary fitting and secondary fitting are subjected to 5 segmentation (i.e. 5 classification) broken lines, and the obtained segmentation/classification data are shown in table 3:
TABLE 3 Table 3
The resulting line graph from the segmentation data of table 3 is shown in fig. 3, where the implementation represents a segmentation broken line and the dashed line represents linearity. Specifically, fig. 4 to 8 are line diagrams (fig. 4 to 8 correspond to one-stage to five-stage, respectively) of 5 sequential levels obtained from the line diagram shown in fig. 3. Wherein, the x-axis in fig. 3-8 is the concentration value output by the first gas sensor and/or the second gas sensor after fitting in the above formula (1), the y-axis is the standard gas concentration value, and the units of the x-axis and the y-axis can be g/m 3 . Specifically, the piecewise polyline functions of FIGS. 4-8 are thus represented as follows:
fig. 4 corresponds to the first order: y= 1.03466 x-0.14485;
fig. 5 corresponds to the second stage: y= 0.97311 x + 1.05352;
fig. 6 corresponds to three stages: y= 1.01197 x-0.91679;
fig. 7 corresponds to four stages: y= 0.98184 x + 1.49239;
fig. 8 corresponds to five stages: y= 1.00293 x-0.62349;
The piecewise broken line function is a single linear regression equation, expresses the relation between the detection value of the sensor after fitting and standard gas, and has a fitting goodness of 1 in each section, and reduces the deviation in a piecewise broken line mode due to certain detection deviation of the sensor in each detection section, so that the detection accuracy in the practical application process is improved.
As can be seen from fig. 4 to 8, the coefficient k and the constant b obtained for each segment (stage) are different, that is, the coefficient k and the constant b for correction are different.
Y=y2×t/(t+t') formula (3)
Wherein, the formula (3) is a temperature influence correction function (the ambient temperature has a certain influence on the detection accuracy of the gas sensor, so that correction is needed), T is temperature data detected by the temperature sensor, T' is absolute temperature, and Y is corrected gas data obtained by the calculation of the formula (3) and displayed by the display, namely Y= [ k (AX) 3 +BX 2 +CX+D）+b]*T/（T+T’）。
It can be seen that, in the preferred embodiment, by introducing the temperature sensor to detect the temperature data, the control unit detects the temperature data obtained by the temperature sensor, and displays the corrected gas data obtained by performing the data correction processing including the linear correlation correction, the piecewise folding processing and the temperature influence correction on the gas data detected by the first gas sensor and/or the second gas sensor through the display according to the temperature data detected by the temperature sensor, so that the accuracy of the gas detection data can be improved.
It will be appreciated that in the present embodiment, the first gas sensor 100 and the second gas sensor 200 are respectively used to detect the concentration of a specific gas (for example, sulfuryl fluoride) or the density of a residual gas (for example, bromomethane) in the gas to be detected. Wherein when the first gas sensor 100 and the second gas sensor 200 are selected to operate simultaneously, the first gas sensor 100 and the second gas sensor 200 are applied to simultaneously detect the concentration of a specific gas (for example, sulfuryl fluoride) in the gas to be detected or simultaneously detect the density of a residual gas (for example, bromomethane) in the gas to be detected.
Referring to fig. 9, an embodiment of the present invention discloses a sensor working channel and a mode selection control method of a gas detector, wherein, as shown in fig. 1, the gas detector includes a first three-way electromagnetic valve 10, a second three-way electromagnetic valve 20, a two-way electromagnetic valve 30, a first normally closed relay 11, a second normally closed relay 21, a first normally open relay 12, a second normally open relay 22, a first connector 13, a second connector 23, a first gas sensor 100, a second gas sensor 200, a sampling pump 40 and a control unit 50. The first connector of the first three-way electromagnetic valve 10 is connected with the output end of the first normally-closed relay 11, the second connector of the first three-way electromagnetic valve 10 is connected with the output end of the first normally-open relay 12, and the third connector of the first three-way electromagnetic valve 10 is connected with the input end of the first connecting piece 13. The first connector of the second three-way electromagnetic valve 20 is connected with the output end of the second normally-closed relay 21, the second connector of the second three-way electromagnetic valve 20 is connected with the output end of the second normally-open relay 22, and the third connector of the second three-way electromagnetic valve 20 is connected with the input end of the second connecting piece 23. The input end of the first normally closed relay 11 and the input end of the second normally closed relay 21 are both connected with the first gas input port 101. The input end of the first normally open relay 12 and the input end of the second normally open relay 22 are both connected with the output end of the two-way electromagnetic valve 30, and the input end of the two-way electromagnetic valve 30 is connected with the second gas input port 102. The output end of the first connecting piece 13 is connected with the input end of the sampling pump 40, and the output end of the second connecting piece 23 is connected with the input end of the sampling pump 40 through the second gas sensor 200. The output end of the sampling pump 40 is connected to a gas output 103 via the first gas sensor 100. The first gas input 101 is used for inputting a gas to be detected, and the second gas input 102 is used for inputting a purge gas. The first normally closed relay 11, the second normally closed relay 21, the first normally open relay 12, the second normally open relay 22, the first gas sensor 100, the second gas sensor 200 and the sampling pump 40 are all connected with the control unit 50, and the sensor operation channel and mode are selected by controlling the power on/off states of the first normally closed relay 11, the second normally closed relay 21, the first normally open relay 12 and the second normally open relay 22 through the control unit 50.
Specifically, the method for controlling the working channel and mode selection of the sensor provided in this embodiment includes the following steps:
s1, when a first gas sensor is selected to work independently and is in a detection mode, setting a detection value of a second gas sensor to be null through the control unit, controlling only the second normally-closed relay to be in an electrified state through the control unit, so that only a first detection channel among the first normally-closed relay, a first three-way electromagnetic valve and a first connecting piece is conducted, and outputting gas to be detected, which is input by the first gas input port, through the first detection channel conducted among the first normally-closed relay, the first three-way electromagnetic valve and the first connecting piece in sequence and through the sampling pump and the first gas sensor;
s2, when the first gas sensor is selected to work independently and is in a purging mode, only the second normally-open relay is controlled to be in a power-off state through the control unit, so that only a first purging channel among the first normally-open relay, the first three-way electromagnetic valve and the first connecting piece is conducted, and purified gas input through the second gas input port and passing through the two-way electromagnetic valve sequentially passes through the first purging channel conducted among the first normally-open relay, the first three-way electromagnetic valve and the first connecting piece, passes through the sampling pump and the first gas sensor and then is output through the gas output port;
S3, when the second gas sensor is selected to work independently and is in a detection mode, setting the detection value of the first gas sensor to be null through the control unit, controlling only the first normally-closed relay to be in an electrified state through the control unit, so that only a second detection channel among the second normally-closed relay, the second three-way electromagnetic valve and the second connecting piece is conducted, and outputting the gas to be detected, which is input by the first gas input port, through the second detection channel conducted among the second normally-closed relay, the second three-way electromagnetic valve and the second connecting piece in sequence and through the second gas sensor, the sampling pump and the first gas sensor;
s4, when the second gas sensor is selected to work independently and is in a purging mode, only the first normally-open relay is controlled to be in a power-off state through the control unit, so that only a second purging channel among the second normally-open relay, the second three-way electromagnetic valve and the second connecting piece is conducted, and purified gas input through the second gas input port and passing through the two-way electromagnetic valve sequentially passes through the second purging channel conducted among the second normally-open relay, the second three-way electromagnetic valve and the second connecting piece and is output through the second gas sensor, the sampling pump and the first gas sensor;
S5, when a first gas sensor and a second gas sensor are selected to work simultaneously and are in a detection mode, the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay are controlled by the control unit to be in a power-off state, so that the first detection channel and the second detection channel are conducted, gas to be detected input by the first gas input port is split into the first detection channel and the second detection channel, and the gas to be detected output by the second detection channel is converged with the gas to be detected output by the first detection channel after passing through the second gas sensor and is output by the gas output port after passing through the sampling pump and the first gas sensor;
s6, when the first gas sensor and the second gas sensor are selected to work simultaneously and are in a purging mode, the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay are controlled by the control unit to be in an electrified state, so that the first purging channel and the second purging channel are conducted, purified gas input by the second gas input port is split into the first purging channel and the second purging channel, and purified gas output by the second purging channel is converged with purified gas output by the first purging channel after passing through the second gas sensor and is output by the gas output port after passing through the sampling pump and the first gas sensor.
Further, the first normally-closed relay, the second normally-closed relay, the first normally-open relay and the second normally-open relay are all time relays; the control unit controls the time periods of power on/off of the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay according to the preset working periods of the detection mode and the purging mode of the first gas sensor and the second gas sensor, so that the detection mode and the purging mode of the first gas sensor and the second gas sensor during independent/simultaneous working can be circularly and uninterruptedly executed.
The working period of the preset detection modes of the first gas sensor and the second gas sensor is 50s-200s, the working period of the preset purging mode of the first gas sensor and the second gas sensor is 10s-50s, and the working period of the preset detection modes of the first gas sensor and the second gas sensor is larger than the working period of the purging mode. For example, as a preferred embodiment, the preset duty cycle of the detection mode of the first gas sensor and the second gas sensor is 100s, and the preset duty cycle of the purge mode of the first gas sensor and the second gas sensor is 30s. In this way, it is possible to ensure that the detection mode and the purge mode of the first gas sensor and the second gas sensor when operated individually/simultaneously are performed cyclically and uninterrupted within a preset operating period.
Further, with continued reference to FIG. 1, as a preferred embodiment, the gas detector further includes a sensor coupled to the sensor
The temperature sensor 300 and the display 60 connected with the control unit 50, the sensor working channel and the mode selection control method further comprise the steps of:
the control unit is used for controlling the first gas according to the temperature data detected by the temperature sensor
The gas data detected by the sensor and/or the second gas sensor are subjected to data correction processing to obtain corrected gas data, and the corrected gas data are displayed through the display; the data correction processing comprises a calculation process of a formula (1) to a formula (3):
Y1=AX 3 +BX 2 +CX+D formula (1)
Wherein, the formula (1) is a linear correlation function, X is gas data obtained by detection of the first gas sensor and/or the second gas sensor, A, B, C and D are linear correlation coefficients, A, B, C and D are obtained in advance after linear fitting standard operation is performed on the gas sensors through a standard based on different types of gas sensors; y1 is the linear correlation corrected gas data obtained by the calculation of the formula (1);
y2=ky1+b formula (2)
Wherein, the formula (2) is a piecewise broken line function, the coefficient k and the constant b are obtained through preset, and Y2 is the gas data after the piecewise broken line processing obtained through the calculation of the formula (2);
Y=y2×t/(t+t') formula (3)
Wherein, formula (3) is a temperature influence correction function (the ambient temperature has a certain influence on the detection accuracy of the gas sensor, so that correction is needed), T is temperature data detected by the temperature sensor, T' is absolute temperature, and Y is corrected gas data obtained after calculation by formula (3) and displayed by the display, namely: y= [ k (AX) 3 +BX 2 +CX+D）+b]*T/（T+T’）。
It will be appreciated that in the present embodiment, the first gas sensor 100 and the second gas sensor 200 are respectively used to detect the concentration of a specific gas (for example, sulfuryl fluoride) or the density of a residual gas (for example, bromomethane) in the gas to be detected. Wherein when the first gas sensor 100 and the second gas sensor 200 are selected to operate simultaneously, the first gas sensor 100 and the second gas sensor 200 are applied to simultaneously detect the concentration of a specific gas (for example, sulfuryl fluoride) in the gas to be detected or simultaneously detect the density of a residual gas (for example, bromomethane) in the gas to be detected.
The foregoing disclosure is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, as it is understood by those skilled in the art that all or part of the above-described embodiments may be practiced without resorting to the equivalent thereof, which is intended to fall within the scope of the invention as defined by the appended claims.

Claims (8)

1. The sensor working channel and mode selection control system of the gas detector is characterized by comprising a first three-way electromagnetic valve, a second three-way electromagnetic valve, a two-way electromagnetic valve, a first normally closed relay, a second normally closed relay, a first normally open relay, a second normally open relay, a first connecting piece, a second connecting piece, a first gas sensor, a second gas sensor, a sampling pump and a control unit; the first connector of the first three-way electromagnetic valve is connected with the output end of the first normally-closed relay, the second connector of the first three-way electromagnetic valve is connected with the output end of the first normally-open relay, and the third connector of the first three-way electromagnetic valve is connected with the input end of the first connecting piece; the first connector of the second three-way electromagnetic valve is connected with the output end of the second normally-closed relay, the second connector of the second three-way electromagnetic valve is connected with the output end of the second normally-open relay, and the third connector of the second three-way electromagnetic valve is connected with the input end of the second connecting piece; the input end of the first normally closed relay and the input end of the second normally closed relay are connected with a first gas input port; the input end of the first normally open relay and the input end of the second normally open relay are both connected with the output end of the two-way electromagnetic valve, and the input end of the two-way electromagnetic valve is connected with the second gas input port; the output end of the first connecting piece is connected with the input end of the sampling pump, and the output end of the second connecting piece is connected with the input end of the sampling pump through the second gas sensor; the output end of the sampling pump is connected with a gas output port through the first gas sensor; the first gas input port is used for inputting gas to be detected, and the second gas input port is used for inputting purified gas; the first normally closed relay, the second normally closed relay, the first normally open relay, the second normally open relay, the first gas sensor, the second gas sensor and the sampling pump are all connected with the control unit, and the control unit controls the power-on/power-off states of the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay to select a sensor working channel and a mode, and the sensor working channel comprises:
When the first gas sensor is selected to work independently and is in a detection mode, setting the detection value of the second gas sensor to be null through the control unit, controlling only the second normally-closed relay to be in an electrified state through the control unit, so that only a first detection channel among the first normally-closed relay, the first three-way electromagnetic valve and the first connecting piece is conducted, and outputting the gas to be detected, which is input by the first gas input port, through the first detection channel conducted among the first normally-closed relay, the first three-way electromagnetic valve and the first connecting piece in sequence and through the sampling pump and the first gas sensor;
when the first gas sensor is selected to work independently and is in a purging mode, the control unit controls only the second normally-open relay to be in a power-off state, so that only a first purging channel among the first normally-open relay, the first three-way electromagnetic valve and the first connecting piece is conducted, and purified gas input by the second gas input port and passing through the two-way electromagnetic valve sequentially passes through the first purging channel conducted among the first normally-open relay, the first three-way electromagnetic valve and the first connecting piece, passes through the sampling pump and the first gas sensor and then is output by the gas output port;
When the second gas sensor is selected to work independently and is in a detection mode, setting the detection value of the first gas sensor to be null through the control unit, controlling only the first normally-closed relay to be in an electrified state through the control unit, thereby only conducting a second detection channel among the second normally-closed relay, the second three-way electromagnetic valve and the second connecting piece, and outputting the gas to be detected, which is input by the first gas input port, through the second detection channel conducted among the second normally-closed relay, the second three-way electromagnetic valve and the second connecting piece in sequence and through the second gas sensor, the sampling pump and the first gas sensor;
when the second gas sensor is selected to work independently and is in a purging mode, the control unit controls only the first normally-open relay to be in a power-off state, so that only a second purging channel among the second normally-open relay, the second three-way electromagnetic valve and the second connecting piece is conducted, and purified gas input by the second gas input port and passing through the two-way electromagnetic valve sequentially passes through the second purging channel conducted among the second normally-open relay, the second three-way electromagnetic valve and the second connecting piece and is output by the gas output port after passing through the second gas sensor, the sampling pump and the first gas sensor;
When a first gas sensor and a second gas sensor are selected to work simultaneously and are in a detection mode, the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay are controlled by the control unit to be in a power-off state, so that the first detection channel and the second detection channel are conducted, gas to be detected input by the first gas input port is split into the first detection channel and the second detection channel, and the gas to be detected output by the second detection channel is converged with the gas to be detected output by the first detection channel after passing through the second gas sensor and is output by the gas output port after passing through the sampling pump and the first gas sensor;
when a first gas sensor and a second gas sensor are selected to work simultaneously and are in a purging mode, the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay are controlled by the control unit to be in an electrified state, so that the first purging channel and the second purging channel are conducted, purified gas input by the second gas input port is shunted through the first purging channel and the second purging channel, and purified gas output by the second purging channel is converged with purified gas output by the first purging channel after passing through the second gas sensor and is output by the gas output port after passing through the sampling pump and the first gas sensor;
The sensor working channel and mode selection control system of the gas detector further comprises a temperature sensor and a display which are connected with the control unit, wherein the control unit corrects the gas data detected by the first gas sensor and/or the second gas sensor according to the temperature data detected by the temperature sensor to obtain corrected gas data, and the corrected gas data is displayed through the display; the data correction processing comprises a calculation process of a formula (1) to a formula (3):
Y1=AX 3 +BX 2 +CX+D formula (1)
Wherein, the formula (1) is a linear correlation function, X is gas data obtained by detection of the first gas sensor and/or the second gas sensor, A, B, C and D are linear correlation coefficients, A, B, C and D are obtained in advance after linear fitting standard operation is performed on the gas sensors through a standard based on different types of gas sensors; y1 is the linear correlation corrected gas data obtained by the calculation of the formula (1);
y2=ky1+b formula (2)
Wherein, the formula (2) is a piecewise broken line function, the coefficient k and the constant b are obtained through preset, and Y2 is the gas data after the piecewise broken line processing obtained through the calculation of the formula (2);
Y=y2×t/(t+t') formula (3)
Wherein, formula (3) is a temperature influence correction function, T is temperature data detected by the temperature sensor, T' is absolute temperature, and Y is corrected gas data calculated by formula (3) and displayed by the display.
2. The sensor operating channel and mode selection control system of a gas detector of claim 1, wherein the first normally closed relay, the second normally closed relay, the first normally open relay, and the second normally open relay are time relays; the control unit controls the time periods of power on/off of the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay according to the preset working periods of the detection mode and the purging mode of the first gas sensor and the second gas sensor, so that the detection mode and the purging mode of the first gas sensor and the second gas sensor during independent/simultaneous working can be circularly and uninterruptedly executed.
3. The sensor operating channel and mode selection control system of claim 2, wherein the preset operating period of the detection mode of the first gas sensor and the second gas sensor is 50s-200s, the preset operating period of the purge mode of the first gas sensor and the second gas sensor is 10s-50s, and the preset operating period of the detection mode of the first gas sensor and the second gas sensor is greater than the operating period of the purge mode.
4. The sensor operating channel and mode selection control system of a gas detector according to claim 1, wherein the first gas sensor and the second gas sensor are respectively used for detecting the concentration of a specific gas or the density of a residual gas in the gas to be detected; wherein the purifying gas is air or nitrogen.
5. The sensor working channel of the gas detector and the mode selection control method are characterized in that the gas detector comprises a first three-way electromagnetic valve, a second three-way electromagnetic valve, a two-way electromagnetic valve, a first normally closed relay, a second normally closed relay, a first normally open relay, a second normally open relay, a first connecting piece, a second connecting piece, a first gas sensor, a second gas sensor, a sampling pump and a control unit; the first connector of the first three-way electromagnetic valve is connected with the output end of the first normally-closed relay, the second connector of the first three-way electromagnetic valve is connected with the output end of the first normally-open relay, and the third connector of the first three-way electromagnetic valve is connected with the input end of the first connecting piece; the first connector of the second three-way electromagnetic valve is connected with the output end of the second normally-closed relay, the second connector of the second three-way electromagnetic valve is connected with the output end of the second normally-open relay, and the third connector of the second three-way electromagnetic valve is connected with the input end of the second connecting piece; the input end of the first normally closed relay and the input end of the second normally closed relay are connected with a first gas input port; the input end of the first normally open relay and the input end of the second normally open relay are both connected with the output end of the two-way electromagnetic valve, and the input end of the two-way electromagnetic valve is connected with the second gas input port; the output end of the first connecting piece is connected with the input end of the sampling pump, and the output end of the second connecting piece is connected with the input end of the sampling pump through the second gas sensor; the output end of the sampling pump is connected with a gas output port through the first gas sensor; the first gas input port is used for inputting gas to be detected, and the second gas input port is used for inputting purified gas; the first normally closed relay, the second normally closed relay, the first normally open relay, the second normally open relay, the first gas sensor, the second gas sensor and the sampling pump are all connected with the control unit, and the control unit controls the power-on/power-off states of the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay to select a sensor working channel and a mode; the sensor working channel and mode selection control method comprises the following steps:
When the first gas sensor is selected to work independently and is in a detection mode, setting the detection value of the second gas sensor to be null through the control unit, controlling only the second normally-closed relay to be in an electrified state through the control unit, so that only a first detection channel among the first normally-closed relay, the first three-way electromagnetic valve and the first connecting piece is conducted, and outputting the gas to be detected, which is input by the first gas input port, through the first detection channel conducted among the first normally-closed relay, the first three-way electromagnetic valve and the first connecting piece in sequence and through the sampling pump and the first gas sensor;
when the first gas sensor is selected to work independently and is in a purging mode, the control unit controls only the second normally-open relay to be in a power-off state, so that only a first purging channel among the first normally-open relay, the first three-way electromagnetic valve and the first connecting piece is conducted, and purified gas input by the second gas input port and passing through the two-way electromagnetic valve sequentially passes through the first purging channel conducted among the first normally-open relay, the first three-way electromagnetic valve and the first connecting piece, passes through the sampling pump and the first gas sensor and then is output by the gas output port;
When the second gas sensor is selected to work independently and is in a detection mode, setting the detection value of the first gas sensor to be null through the control unit, controlling only the first normally-closed relay to be in an electrified state through the control unit, thereby only conducting a second detection channel among the second normally-closed relay, the second three-way electromagnetic valve and the second connecting piece, and outputting the gas to be detected, which is input by the first gas input port, through the second detection channel conducted among the second normally-closed relay, the second three-way electromagnetic valve and the second connecting piece in sequence and through the second gas sensor, the sampling pump and the first gas sensor;
when the second gas sensor is selected to work independently and is in a purging mode, the control unit controls only the first normally-open relay to be in a power-off state, so that only a second purging channel among the second normally-open relay, the second three-way electromagnetic valve and the second connecting piece is conducted, and purified gas input by the second gas input port and passing through the two-way electromagnetic valve sequentially passes through the second purging channel conducted among the second normally-open relay, the second three-way electromagnetic valve and the second connecting piece and is output by the gas output port after passing through the second gas sensor, the sampling pump and the first gas sensor;
When a first gas sensor and a second gas sensor are selected to work simultaneously and are in a detection mode, the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay are controlled by the control unit to be in a power-off state, so that the first detection channel and the second detection channel are conducted, gas to be detected input by the first gas input port is split into the first detection channel and the second detection channel, and the gas to be detected output by the second detection channel is converged with the gas to be detected output by the first detection channel after passing through the second gas sensor and is output by the gas output port after passing through the sampling pump and the first gas sensor;
when a first gas sensor and a second gas sensor are selected to work simultaneously and are in a purging mode, the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay are controlled by the control unit to be in an electrified state, so that the first purging channel and the second purging channel are conducted, purified gas input by the second gas input port is shunted through the first purging channel and the second purging channel, and purified gas output by the second purging channel is converged with purified gas output by the first purging channel after passing through the second gas sensor and is output by the gas output port after passing through the sampling pump and the first gas sensor;
The gas detector also comprises a temperature sensor and a display which are connected with the control unit, and the sensor working channel and mode selection control method further comprises the following steps:
the control unit is used for controlling the first gas according to the temperature data detected by the temperature sensor
The gas data detected by the sensor and/or the second gas sensor are subjected to data correction processing to obtain corrected gas data, and the corrected gas data are displayed through the display; the data correction processing comprises a calculation process of a formula (1) to a formula (3):
Y1=AX 3 +BX 2 +CX+D formula (1)
Wherein, the formula (1) is a linear correlation function, X is gas data obtained by detection of the first gas sensor and/or the second gas sensor, A, B, C and D are linear correlation coefficients, A, B, C and D are obtained in advance after linear fitting standard operation is performed on the gas sensors through a standard based on different types of gas sensors; y1 is the linear correlation corrected gas data obtained by the calculation of the formula (1);
y2=ky1+b formula (2)
Wherein, the formula (2) is a piecewise broken line function, the coefficient k and the constant b are obtained through preset, and Y2 is the gas data after the piecewise broken line processing obtained through the calculation of the formula (2);
Y=y2×t/(t+t') formula (3)
Wherein, formula (3) is a temperature influence correction function, T is temperature data detected by the temperature sensor, T' is absolute temperature, and Y is corrected gas data calculated by formula (3) and displayed by the display.
6. The sensor operating channel and mode selection control method of a gas detector according to claim 5, wherein the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay are all time relays; the control unit controls the time periods of power on/off of the first normally closed relay, the second normally closed relay, the first normally open relay and the second normally open relay according to the preset working periods of the detection mode and the purging mode of the first gas sensor and the second gas sensor, so that the detection mode and the purging mode of the first gas sensor and the second gas sensor during independent/simultaneous working can be circularly and uninterruptedly executed.
7. The method according to claim 6, wherein the preset operation period of the detection mode of the first gas sensor and the second gas sensor is 50s-200s, the preset operation period of the purge mode of the first gas sensor and the second gas sensor is 10s-50s, and the preset operation period of the detection mode of the first gas sensor and the second gas sensor is larger than the operation period of the purge mode.
8. The sensor operation channel and mode selection control method of a gas detector according to claim 5, wherein the first gas sensor and the second gas sensor are respectively used for detecting a concentration of a specific gas or a density of a residual gas in the gas to be detected; wherein the purifying gas is air or nitrogen.
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