CN114113480B - Multi-gas sensor response time automatic testing device and method - Google Patents
Multi-gas sensor response time automatic testing device and method Download PDFInfo
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- CN114113480B CN114113480B CN202111393754.4A CN202111393754A CN114113480B CN 114113480 B CN114113480 B CN 114113480B CN 202111393754 A CN202111393754 A CN 202111393754A CN 114113480 B CN114113480 B CN 114113480B
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- 230000004044 response Effects 0.000 title claims abstract description 144
- 238000012360 testing method Methods 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000007789 gas Substances 0.000 claims description 450
- 239000003570 air Substances 0.000 claims description 79
- 239000012080 ambient air Substances 0.000 claims description 16
- 238000004364 calculation method Methods 0.000 claims description 14
- 238000010998 test method Methods 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 10
- 238000013500 data storage Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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Abstract
The application provides a multi-gas sensor response time automatic testing device and method, the device is through associating the control unit with first test gas circuit, multi-gas sensor, obtains the first response time of multi-gas sensor according to first test gas circuit air feed moment and multi-gas sensor's real-time sensing concentration, and the device can test the first response time of every gas of multi-gas sensor simultaneously, and is efficient to measuring result error is little, more accurate.
Description
Technical Field
The application belongs to the technical field of gas sensors, and particularly relates to an automatic testing device and method for response time of multiple gas sensors.
Background
The response time is one of important indexes of the gas detection sensor and is used for evaluating the response speed of the sensor to the gas, and mainly comprises two indexes of T90 and T10, wherein T90 refers to the time required for the sensor to respond to the input gas until the final gas concentration reading reaches 90%; t10 refers to the time required to reach 10% of the gas steady concentration reading since the sensor output indication begins to drop. For example, motor vehicle exhaust gas analyzer sensor response time T90 requires HC, CO 2 5.5s, O 2 The requirement is 7.5s; t10 requires HC, CO and CO 2 5.7s, O 2 The requirement is 8.5s; flue gas analysis instrument SO 2 The requirements for T90 and T10 are 120s for NO, oxygen, etc.
The response time of the traditional sensor is usually measured one by a manual measuring method through a stopwatch reading mode, whether the sensor is qualified or not is judged, and for the sensor or the sensor combination capable of measuring multiple gases simultaneously, the method is time-consuming in measurement and low in efficiency; on the other hand, the measurement result is easily affected by manual operation speed, and the accuracy of the measurement result is insufficient.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides an automatic testing device and method for response time of a multi-gas sensor, and the technical scheme is as follows.
An automatic multi-gas sensor response time testing device, comprising:
the first test gas circuit is communicated with the multi-gas sensor; the first test gas circuit supplies mixed standard gas for the multi-gas sensor;
the control unit is electrically connected with the first test gas circuit and the multi-gas sensor, and is used for acquiring the first response time of the multi-gas sensor according to the concentration of the mixed standard gas, the gas supply time of the first test gas circuit and the real-time sensing concentration of the multi-gas sensor.
In some embodiments of the present application, the multi-gas sensor response time automatic test apparatus includes:
the second test gas circuit is communicated with the multi-gas sensor; the second test air path supplies ambient air for the multi-gas sensor;
the control unit is electrically connected with the second test gas circuit, and is used for acquiring second response time of the multi-gas sensor according to the gas supply time of the second test gas circuit and the real-time sensing concentration of the multi-gas sensor.
In some embodiments of the present application, the first test gas circuit includes:
the gas marking port is communicated with the multi-gas sensor;
a two-way electromagnetic valve arranged between the multi-gas sensor and the standard gas port;
and an air outlet in communication with the multi-gas sensor;
the second test air path includes:
a check valve communicated to the two-way solenoid valve;
a sample gas port communicated with the one-way valve;
the air pump is arranged between the sample air port and the one-way valve; the check valve only allows gas to flow from the air pump side to the multi-gas sensor side, and prevents gas from flowing from the two-way electromagnetic valve side to the air pump side.
In some embodiments of the present application, the control unit is electrically connected to the two-way electromagnetic valve, the air pump, and the multi-gas sensor, respectively; the control unit can acquire the first response time of the multi-gas sensor according to the concentration of the mixed standard gas, the opening time of the two-way electromagnetic valve and the real-time sensing concentration of the multi-gas sensor;
the control unit can acquire the second response time of the multi-gas sensor according to the concentration of the mixed standard gas, the starting time of the air pump and the real-time sensing concentration of the multi-gas sensor.
In some embodiments of the present application, the control unit includes:
the user input module is used for inputting the concentration of the mixed standard gas, the opening and closing instructions of the two-way electromagnetic valve and the opening and closing instructions of the air pump;
the air path control module is connected with the user input module, the two-way electromagnetic valve and the air pump in a communication manner and is used for controlling the opening and closing of the two-way electromagnetic valve and the opening and closing of the air pump according to the opening and closing instructions of the two-way electromagnetic valve and the opening and closing instructions of the air pump;
and the response time calculation module is in communication connection with the user input module, the double-pass electromagnetic valve, the air pump and the multi-gas sensor, and calculates the response time of the multi-gas sensor according to the concentration of the mixed standard gas, the opening time of the double-pass electromagnetic valve, the opening time of the air pump and the real-time sensing concentration of the multi-gas sensor.
In some embodiments of the present application, the multi-gas sensor response time automatic test apparatus further comprises:
the data storage module is connected with the response time calculation module and used for storing response time data;
and the display output module is connected with the response time calculation module and is used for displaying the response time in real time.
The application also provides a multi-gas sensor response time automatic test method, which adopts the multi-gas sensor response time automatic test device, and comprises the following steps:
and (3) introducing mixed standard gas: the first test gas circuit is conducted to supply mixed standard gas for the multiple gas sensors;
a first response time testing step: and the control unit calculates the first response time of the multi-gas sensor according to the gas supply time of the first test gas circuit and the time when the real-time sensing concentration of the multi-gas sensor reaches 90% of the mixed standard gas concentration or the time when the real-time sensing concentration of the multi-gas sensor reaches 10% of the mixed standard gas concentration.
The application also provides a multi-gas sensor response time automatic test method, which adopts the multi-gas sensor response time automatic test device, and comprises the following steps:
and (3) introducing mixed standard gas: the first test gas circuit is conducted to supply mixed standard gas for the multiple gas sensors;
a first response time testing step: the control unit calculates a first response time of the multi-gas sensor according to the gas supply time of the first test gas circuit and the time when the real-time sensing concentration of the multi-gas sensor reaches 90% of the mixed standard gas concentration or the time when the real-time sensing concentration of the multi-gas sensor reaches 10% of the mixed standard gas concentration;
and (3) introducing ambient air: closing the first test air path, and conducting the second test air path to supply the environment air for the multi-gas sensor;
a second response time testing step: and the control unit calculates the second response time of the multi-gas sensor according to the gas supply time of the second test gas circuit and the time when the real-time sensing concentration of the multi-gas sensor reaches 10% of the mixed standard gas concentration or the time when the real-time sensing concentration of the multi-gas sensor reaches 90% of the mixed standard gas concentration.
Further, in the first response time testing step, if the multi-gas sensor senses that the concentration of one gas in the mixed standard gas is gradually increased in real time, the time difference between the gas supply time of the first test gas path and the time when the real-time sensing concentration of the multi-gas sensor reaches 90% of the mixed standard gas concentration is the first response time; and if the multi-gas sensor senses that the concentration of one gas in the mixed standard gas is gradually reduced in real time, the time difference between the gas supply time of the first test gas circuit and the time when the real-time sensing concentration of the multi-gas sensor reaches 10% of the mixed standard gas concentration is the first response time.
Further, in the second response time testing step, if the multi-gas sensor senses that the concentration of one gas in the mixed standard gas is gradually reduced in real time, the time difference between the gas supply time of the second test gas circuit and the time when the real-time sensing concentration of the multi-gas sensor reaches 10% of the mixed standard gas concentration is the second response time; and if the multi-gas sensor senses that the concentration of one gas in the mixed standard gas is gradually increased in real time, the time difference between the gas supply time of the second test gas circuit and the time when the real-time sensing concentration of the multi-gas sensor reaches 90% of the mixed standard gas concentration is the second response time.
Compared with the prior art, the beneficial effects of this application are:
the application provides a many gas sensor response time automatic testing device, the device is through associating the control unit with first test gas circuit, many gas sensors, obtains many gas sensors's first response time according to first test gas circuit air feed moment and many gas sensors's real-time sensing concentration, and the device can test many gas sensors's every gaseous first response time simultaneously, and is efficient to measuring result error is little, more accurate.
Drawings
FIG. 1 is a schematic structural diagram of an automatic multi-gas sensor response time testing device according to one embodiment of the present application;
FIG. 2 is a schematic structural diagram of a control unit according to one embodiment of the present application;
FIG. 3 is a schematic flow chart of an automatic multi-gas sensor response time test according to one embodiment of the present application;
numbering in the figures: 1. a first test air path; 11. a gas marking port; 12. a two-way electromagnetic valve; 13. an air outlet; 2. a multi-gas sensor; 3. a control unit; 31. a user input module; 32. the gas circuit control module; 33. a response time calculation module; 34. a data storage module; 35. a display output module; 4. a second test air path; 41. a one-way valve; 42. a sample gas port; 43. an air pump.
Detailed Description
The following detailed description of the technical aspects of the present application is provided in connection with specific embodiments, however, it should be understood that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
In the description of the present application, it should be understood that 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 an implicit indication of the number of technical features being 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 application, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
It is understood that the terms "system," "unit," "module," and the like, as used herein, are intended to be a means for distinguishing between different components, elements, parts, portions, or groups of components at different levels. However, if these terms are substituted by other expression patterns which achieve the same purpose.
It will be understood that when an element, module, or block is referred to as being "connected to" or "coupled to" another element, module, or block, it can be directly connected, coupled, or in communication with the other element, module, or block, and intervening elements, modules, or blocks may be present therebetween unless the context clearly dictates otherwise.
The described embodiments are merely illustrative of the preferred embodiments of the present application and are not intended to limit the scope of the present application, and various modifications and improvements made by those skilled in the art to the technical solutions of the present application should fall within the protection scope defined by the claims of the present application without departing from the spirit of the design of the present application.
As shown in fig. 1, the automatic testing device for response time of multiple gas sensors provided in the first embodiment of the present application includes: a first test gas circuit 1, a multi-gas sensor 2 communicated with the first test gas circuit 1; the first test gas circuit 1 supplies mixed standard gas for the multi-gas sensor 2;
the control unit 3 is electrically connected with the first test gas circuit 1 and the multi-gas sensor 2, and the control unit 3 is used for acquiring the first response time of the multi-gas sensor 2 according to the concentration of the mixed standard gas, the gas supply time of the first test gas circuit 1 and the real-time sensing concentration of the multi-gas sensor 2. Wherein a multi-gas sensor refers to a sensor having a plurality of gas measuring functions simultaneously or a combination of a plurality of different gas measuring functions.
Further, as shown in fig. 1, the automatic testing device for response time of multiple gas sensors further includes:
a second test gas circuit 4, wherein the second test gas circuit 4 is communicated with the multi-gas sensor 2; the second test air path 4 supplies the multi-gas sensor 2 with ambient air;
the control unit 3 is electrically connected with the second test gas circuit 4, and the control unit 3 is configured to obtain a second response time of the multi-gas sensor 2 according to a gas supply time of the second test gas circuit 4 and a real-time sensing concentration of the multi-gas sensor 2.
Specifically, the first test air path 1 includes:
a gas marking port 11, wherein the gas marking port 11 is communicated with the multi-gas sensor 2;
a two-way electromagnetic valve 12 provided between the multi-gas sensor 2 and the gas marking port 11;
and an air outlet 13 communicating with the multi-gas sensor 2;
the second test air path 4 includes:
a check valve 41 connected to the two-way solenoid valve 12;
a sample gas port 42 communicating with the check valve 41;
an air pump 43 provided between the sample gas port 42 and the check valve 41; wherein the check valve 41 allows only the gas to flow from the side of the air pump 43 to the side of the multi-gas sensor 2, and prevents the gas from flowing from the side of the two-way electromagnetic valve 12 to the side of the air pump 43.
The one-way valve 41 and the two-way electromagnetic valve 12 are connected with the multi-gas sensor 2 through pipelines; the two-way electromagnetic valve 12, the air pump 43, the one-way valve 41, the air marking port 11, the sample port 42 and the air outlet 13 are connected through pipelines. The pipeline can be made of PTFE, PFA or PU materials, the pipeline gas adsorption rate of the materials is low, the detected gas is not easy to adsorb, and the influence on the test result is small.
Specifically, the control unit 3 is electrically connected to the two-way electromagnetic valve 12, the air pump 43, and the multi-gas sensor 2, respectively; the control unit 3 may obtain the first response time of the multi-gas sensor according to the concentration of the mixed standard gas, the opening time of the two-way electromagnetic valve 12, and the real-time sensing concentration of the multi-gas sensor 2;
the control unit 3 may acquire the second response time of the multi-gas sensor according to the concentration of the mixed standard gas, the opening time of the air pump 43, and the real-time sensing concentration of the multi-gas sensor 2. In this embodiment, the control unit uses an ARM processor to control the entire response time test process.
The opening timing of the two-way electromagnetic valve 12, i.e., the first timing, is the timing at which the mixed standard gas starts to enter the multi-gas sensor 2. The two-way electromagnetic valve 12 is kept in an open state, the multi-gas sensor 2 senses the concentration of each gas in real time, and when each gas concentration reaches a certain percentage of each gas concentration in the mixed standard gas, the control unit records the moment as a second moment and calculates the first response time according to the time difference between the second moment and the first moment.
After the first response time test is completed, the two-way electromagnetic valve 12 is closed, the air pump 43 is turned on to supply the ambient air to the multi-gas sensor 2, and the air pump 43 is turned on at the time when the ambient air starts diluting the respective gas concentrations entering the multi-gas sensor 2, i.e., at the third time. The air pump 43 is kept in an on state, the multi-gas sensor 2 senses the concentration of each gas in real time, and when each gas concentration reaches a certain percentage of each gas concentration in the mixed standard gas, the control unit records the moment as a fourth moment and calculates a second response time according to the time difference between the fourth moment and the third moment.
It is noted that the first response time and the second response time are merely to distinguish between the measured response times of different test recordings. For example, motor vehicle exhaust gases include HC, CO 2 、NO、O 2 O in ambient air 2 About 20.9%, and when used for measuring the response time of the motor vehicle exhaust analysis instrument, the two-way electromagnetic valve is opened, and the mixed standard gas enters the multi-gas sensor, except O 2 The concentration begins to drop and the other gas concentration values begin to rise, so for response times T90 and T10 of the gas sensor, the first test gas path can be used to test multiple gas sensors for HC, CO 2 T90 of NO, and can be used to measure the number of gas sensors for O 2 T10 of (b). Thus, the first response time may be T90 or T10. When the two-way electromagnetic valve is closed and the air pump is opened, the ambient air enters the multi-gas sensor, O 2 The concentration starts to rise, HC, CO and CO 2 The NO concentration value begins to drop, and therefore, for response times T90 and T10 of the gas sensor, the second test gas path mayFor testing multi-gas sensor for HC, CO and CO 2 T10 of NO, and can be used to measure the number of gas sensors for O 2 T90 of (b). Thus, the second response time is also possible to be T90 or T10.
As shown in fig. 2, the control unit 3 includes: a user input module 31, wherein the user input module 31 is configured to input the concentration of the mixed standard gas, the opening and closing instruction of the two-way electromagnetic valve 12, and the opening and closing instruction of the air pump 43;
the air path control module 32 is in communication connection with the user input module 31, the two-way electromagnetic valve 12 and the air pump 43, and is used for controlling the opening and closing of the two-way electromagnetic valve 12 and the opening and closing of the air pump 43 according to the opening and closing instruction of the two-way electromagnetic valve 12 and the opening and closing instruction of the air pump 43;
the response time calculation module 33 is in communication connection with the user input module 31, the two-way electromagnetic valve 12, the air pump 43 and the multi-gas sensor 2, and calculates the response time of the multi-gas sensor 2 according to the concentration of the mixed standard gas, the opening time of the two-way electromagnetic valve 12, the opening time of the air pump 43 and the real-time sensing concentration of the multi-gas sensor 2.
In order to visualize the test result and facilitate multiple measurements, the multi-gas sensor response time automatic test device further comprises:
a data storage module 34, wherein the data storage module 34 is connected with the response time calculation module 33 and is used for storing response time data;
and the display output module 35 is connected with the response time calculation module 33 and is used for displaying the response time in real time.
The second embodiment of the present application provides a method for automatically testing response time of multiple gas sensors, which adopts the device for automatically testing response time of multiple gas sensors according to the first embodiment, and specifically includes the following steps:
s1: a step of introducing mixed standard gas, namely, a first test gas circuit is conducted to supply the mixed standard gas for the multi-gas sensor;
s2: a first response time testing step: and the control unit calculates the first response time of the multi-gas sensor according to the gas supply time of the first test gas circuit and the time when the real-time sensing concentration of the multi-gas sensor reaches 90% of the mixed standard gas concentration or the time when the real-time sensing concentration of the multi-gas sensor reaches 10% of the mixed standard gas concentration.
For the multi-gas sensor response time automatic testing device with a first testing gas circuit and a second testing gas circuit, the automatic testing method specifically comprises the following steps:
s1: a step of introducing mixed standard gas, namely, a first test gas circuit is conducted to supply the mixed standard gas for the multi-gas sensor;
s2: a first response time testing step, wherein a control unit calculates a first response time of the multi-gas sensor according to the gas supply time of the first test gas circuit and the time when the real-time sensing concentration of the multi-gas sensor reaches 90% of the mixed standard gas concentration or the time when the real-time sensing concentration of the multi-gas sensor reaches 10% of the mixed standard gas concentration;
s3: an ambient air inlet step, namely closing the first test air path, conducting the second test air path, and supplying ambient air for the multi-gas sensor;
s4: and a second response time testing step, wherein the control unit calculates the second response time of the multi-gas sensor according to the gas supply time of the second test gas circuit and the time when the real-time sensing concentration of the multi-gas sensor reaches 10% of the mixed standard gas concentration or the time when the real-time sensing concentration of the multi-gas sensor reaches 90% of the mixed standard gas concentration.
Specifically, in the first response time testing step, if the multi-gas sensor senses that the concentration of one gas in the mixed standard gas is gradually increased in real time, the time difference between the gas supply time of the first test gas path and the time when the real-time sensing concentration of the multi-gas sensor reaches 90% of the mixed standard gas concentration is the first response time; and if the multi-gas sensor senses that the concentration of one gas in the mixed standard gas is gradually reduced in real time, the time difference between the gas supply time of the first test gas circuit and the time when the real-time sensing concentration of the multi-gas sensor reaches 10% of the mixed standard gas concentration is the first response time.
Specifically, in the second response time testing step, if the multi-gas sensor senses that the concentration of one gas in the mixed standard gas is gradually reduced in real time, the time difference between the gas supply time of the second test gas circuit and the time when the real-time sensing concentration of the multi-gas sensor reaches 10% of the mixed standard gas concentration is the second response time; and if the multi-gas sensor senses that the concentration of one gas in the mixed standard gas is gradually increased in real time, the time difference between the gas supply time of the second test gas circuit and the time when the real-time sensing concentration of the multi-gas sensor reaches 90% of the mixed standard gas concentration is the second response time.
When the test method is used for measuring response time of the motor vehicle tail gas analyzer sensor, the user input module is used for inputting concentration values of various gases of mixed standard gas, then a double-pass electromagnetic valve opening command is input, the gas circuit control module is used for controlling the double-pass electromagnetic valve to be opened after receiving the double-pass electromagnetic valve opening command, the response time calculation module is used for recording the opening time of the double-pass electromagnetic valve, the mixed standard gas enters the multi-gas sensor, the concentration values displayed by the multi-gas sensor are changed along with the time, and O is used for controlling the double-pass electromagnetic valve to be opened 2 The concentration begins to drop, other gas concentration values begin to rise, when the multi-gas sensor detects that one gas concentration reaches 90% of the mixed standard gas concentration, the first time is recorded, and the response time calculation module obtains one gas response time T90 value according to the time difference between the first time and the opening time of the double-pass electromagnetic valve; similarly, for each gas in the mixed standard gas, the time when the concentration of the gas reaches 90% of the concentration of the mixed standard gas measured by the multiple gas sensors is recorded in sequence, and then the response time T90 value of the gas can be obtained. For O 2 When O measured by multiple gas sensors 2 The concentration is O in the mixed standard gas 2 At 10% of the concentration, the time at this time was recorded to obtain O 2 Is a response time T10 value. If the mixed standard gas is introduced for 30 seconds, the concentration of each gasAnd if no response exists, ending the response time T90 test, and prompting that the multi-gas sensor response time T90 test is not qualified. If the mixed standard gas is introduced for 30 seconds, if the gas still does not reach 90% of the concentration of the mixed standard gas, the corresponding gas response time T90 is not qualified.
After the mixed standard gas is introduced for 30 seconds, a closing instruction of the double-pass electromagnetic valve is input through the user input module, the gas circuit control module controls the closing of the double-pass electromagnetic valve after receiving the closing instruction of the double-pass electromagnetic valve, then, a starting instruction of the gas pump is input through the user input module, the gas circuit control module controls the gas pump to start after receiving the starting instruction of the gas pump, the response time calculation module records the starting moment of the gas pump, the ambient air enters the multiple gas sensors, the concentration value displayed by the multiple gas sensors changes along with the time, and O 2 The concentration starts to rise, the concentration value of other gases starts to fall, when the multi-gas sensor detects O 2 When the concentration reaches 90% of the concentration of the mixed standard gas, recording a second time, and obtaining O according to the time difference between the second time and the opening time of the air pump by the response time calculation module 2 Response time T90 values; and for other gases in the mixed standard gas, sequentially recording the time when the concentration of the gases detected by the multi-gas sensor reaches 10% of the concentration of the mixed standard gas, and obtaining the response time T10 value of each gas. If the air pump supplies the ambient air for 30 seconds, the concentration of each gas does not decrease, the response time T10 test is ended, and the response time T10 test is indicated to be unqualified. If the air pump supplies the ambient air for 30 seconds and if the gas still does not reach 10% of the mixed standard gas concentration, the corresponding gas response time T10 is not qualified.
Claims (10)
1. A multi-gas sensor response time automatic test method, characterized in that a multi-gas sensor response time automatic test device is adopted, the multi-gas sensor response time automatic test device comprising:
the first test gas circuit is communicated with the multi-gas sensor; the first test gas circuit supplies mixed standard gas for the multi-gas sensor;
the control unit is electrically connected with the first test gas circuit and the multi-gas sensor and is used for acquiring first response time of the multi-gas sensor according to the concentration of the mixed standard gas, the gas supply time of the first test gas circuit and the real-time sensing concentration of the multi-gas sensor;
the second test gas circuit is communicated with the multi-gas sensor; the second test air path supplies ambient air for the multi-gas sensor;
the control unit is electrically connected with the second test gas circuit and is used for acquiring second response time of the multi-gas sensor according to the gas supply time of the second test gas circuit and the real-time sensing concentration of the multi-gas sensor;
the multi-gas sensor response time automatic test method comprises the following steps:
and (3) introducing mixed standard gas: the first test gas circuit is conducted to supply mixed standard gas for the multiple gas sensors;
a first response time testing step: the control unit calculates first response time of the multi-gas sensor according to the air supply time of the first test air circuit and the fact that the real-time sensing concentration of the multi-gas sensor reaches 90% of the mixed standard gas concentration;
and (3) introducing ambient air: closing the first test air path, and conducting the second test air path to supply the environment air for the multi-gas sensor;
a second response time testing step: and the control unit calculates the second response time of the multi-gas sensor according to the air supply time of the second test air circuit and the fact that the real-time sensing concentration of the multi-gas sensor reaches 10% of the mixed standard gas concentration.
2. The automatic test method of response time of multiple gas sensors according to claim 1, wherein in the first response time test step, if the multiple gas sensors sense that the concentration of one gas in the mixed standard gas is gradually increased in real time, a time difference between a gas supply time of the first test gas path and a time when the real-time sensed concentration of the multiple gas sensors reaches 90% of the mixed standard gas concentration is the first response time.
3. The automatic multi-gas sensor response time testing method according to claim 1 or 2, wherein in the second response time testing step, if the multi-gas sensor senses that the concentration of one of the mixed standard gases is gradually reduced in real time, a time difference between a gas supply time of the second test gas path and a time when the real-time sensed concentration of the multi-gas sensor reaches 10% of the mixed standard gas concentration is the second response time.
4. A multi-gas sensor response time automatic test method, characterized in that a multi-gas sensor response time automatic test device is adopted, the multi-gas sensor response time automatic test device comprising:
the first test gas circuit is communicated with the multi-gas sensor; the first test gas circuit supplies mixed standard gas for the multi-gas sensor;
the control unit is electrically connected with the first test gas circuit and the multi-gas sensor and is used for acquiring first response time of the multi-gas sensor according to the concentration of the mixed standard gas, the gas supply time of the first test gas circuit and the real-time sensing concentration of the multi-gas sensor;
the second test gas circuit is communicated with the multi-gas sensor; the second test air path supplies ambient air for the multi-gas sensor;
the control unit is electrically connected with the second test gas circuit and is used for acquiring second response time of the multi-gas sensor according to the gas supply time of the second test gas circuit and the real-time sensing concentration of the multi-gas sensor;
the multi-gas sensor response time automatic test method comprises the following steps:
and (3) introducing mixed standard gas: the first test gas circuit is conducted to supply mixed standard gas for the multiple gas sensors;
a first response time testing step: the control unit calculates first response time of the multi-gas sensor according to the gas supply time of the first test gas circuit and the time when the real-time sensing concentration of the multi-gas sensor reaches 10% of the mixed standard gas concentration;
and (3) introducing ambient air: closing the first test air path, and conducting the second test air path to supply the environment air for the multi-gas sensor;
a second response time testing step: and the control unit calculates the second response time of the multi-gas sensor according to the gas supply time of the second test gas circuit and the time when the real-time sensing concentration of the multi-gas sensor reaches 90% of the mixed standard gas concentration.
5. The method according to claim 4, wherein in the first response time testing step, if the multi-gas sensor senses that the concentration of one of the mixed standard gases is gradually reduced in real time, a time difference between a gas supply time of the first test gas path and a time when the real-time sensed concentration of the multi-gas sensor reaches 10% of the mixed standard gas concentration is the first response time.
6. The method according to claim 4 or 5, wherein in the second response time testing step, if the multi-gas sensor senses that the concentration of one of the mixed standard gases is gradually increased in real time, a time difference between a gas supply time of the second test gas path and a time when the real-time sensed concentration of the multi-gas sensor reaches 90% of the mixed standard gas concentration is the second response time.
7. The method of claim 1 or 4, wherein the first test gas path comprises:
the gas marking port is communicated with the multi-gas sensor;
a two-way electromagnetic valve arranged between the multi-gas sensor and the standard gas port;
and an air outlet in communication with the multi-gas sensor;
the second test air path includes:
a check valve communicated to the two-way solenoid valve;
a sample gas port communicated with the one-way valve;
the air pump is arranged between the sample air port and the one-way valve; the check valve only allows gas to flow from the air pump side to the multi-gas sensor side, and prevents gas from flowing from the two-way electromagnetic valve side to the air pump side.
8. The automatic test method of response time of multiple gas sensors according to claim 7, wherein the control unit is electrically connected with the two-way solenoid valve, the air pump, the multiple gas sensors, respectively; the control unit can acquire the first response time of the multi-gas sensor according to the concentration of the mixed standard gas, the opening time of the two-way electromagnetic valve and the real-time sensing concentration of the multi-gas sensor;
the control unit can acquire the second response time of the multi-gas sensor according to the concentration of the mixed standard gas, the starting time of the air pump and the real-time sensing concentration of the multi-gas sensor.
9. The multi-gas sensor response time automatic test method of claim 8, wherein the control unit comprises:
the user input module is used for inputting the concentration of the mixed standard gas, the opening and closing instructions of the two-way electromagnetic valve and the opening and closing instructions of the air pump;
the air path control module is connected with the user input module, the two-way electromagnetic valve and the air pump in a communication manner and is used for controlling the opening and closing of the two-way electromagnetic valve and the opening and closing of the air pump according to the opening and closing instructions of the two-way electromagnetic valve and the opening and closing instructions of the air pump;
and the response time calculation module is in communication connection with the user input module, the double-pass electromagnetic valve, the air pump and the multi-gas sensor, and calculates the response time of the multi-gas sensor according to the concentration of the mixed standard gas, the opening time of the double-pass electromagnetic valve, the opening time of the air pump and the real-time sensing concentration of the multi-gas sensor.
10. The multi-gas sensor response time automatic test method of claim 9, further comprising:
the data storage module is connected with the response time calculation module and used for storing response time data;
and the display output module is connected with the response time calculation module and is used for displaying the response time in real time.
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