CN203324220U - Multi-component gas monitoring device - Google Patents
Multi-component gas monitoring device Download PDFInfo
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- CN203324220U CN203324220U CN2013203576220U CN201320357622U CN203324220U CN 203324220 U CN203324220 U CN 203324220U CN 2013203576220 U CN2013203576220 U CN 2013203576220U CN 201320357622 U CN201320357622 U CN 201320357622U CN 203324220 U CN203324220 U CN 203324220U
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Abstract
The utility model discloses a multi-component gas monitoring device, belonging to the technical field of gas measurement equipment. The multi-component gas monitoring device comprises a gas collector (2), a high-pressure gas cylinder (4), a gas electromagnetic valve (5), a gas flow stabilizer (6), an electrochemical gas sensor array (7), a gas measurement chamber (8), a power supply control module (10), a microprocessor (11), a humidity measurement module (12), a temperature measurement module (13) and a display module (14), wherein after the electrochemical gas sensor array measures the components and concentration of the gas to be measured, the sensor measurement signal is processed by the microprocessor and displayed on the display module, and the microprocessor corrects the measurement result according to the humidity and temperature of the gas to be measured. According to the device, the array formed by the plurality of low-cost electrochemical gas sensors can monitor the multi-component gas, thereby avoiding the problem of cross sensitivity of the sensors. The utility model has the advantages of simple structure and small size, enhances the multi-component gas measurement accuracy, and can be widely applied.
Description
Technical field
The utility model relates to a kind of multicomponent gas monitoring device, is applicable to gas composition analysis and the measurement of concetration of complicated gaseous environment, belongs to the technical field of gas measuring apparatus.
Background technology
How adopted gas monitoring system is the pure gas monitoring system at present, namely single gas sensor and related circuit, consists of.This is mainly that measurement feature by current gas sensor determines.Gas sensor divides according to measuring principle, and electric chemical formula gas sensor, semiconductor-type gas sensor, thermocatalysis formula gas sensor and optical profile type gas sensor are arranged.The cross-sensitivity that the sensor that wherein adopts optical principle to carry out the gas concentration analysis has is the most weak, therefore also usually is used the gas composition that carries out complicated gaseous environment and measures.Yet the price of optical profile type gas sensor is usually comparatively expensive, all can't popularize on a large scale all the time in market, and be mainly to be used in institute to carry out high-accuracy gas analysis.
Yet the actual measurement environment is the multicomponent gas environment normally, there is multiple gases in environment, such as methane-generating pit yeasting, Industrial Area Atmospheric environment etc.Carry out certain gas parameter analysis in this environment, if only adopt the pure gas sensor, this sensor can be subject to the impact of other non-gas compositions to be measured so.Therefore in practical application in order accurately to measure certain gas composition, just need to be purified to the gas of sampling, the operation such as filtration, after having filtered out so non-gas composition to be measured, although reduced measuring error, yet newly-increased assembly can increase the cost that gas parameter is analyzed, also be unfavorable for the on-line monitoring of gas simultaneously.Also often adopt the optical type gas analyser in market, the multicomponent gas environment is carried out to the parameter analysis.The optical type gas analyser is to adopt optical principle, as the gas absorption frequency spectrum etc., gas is measured.In the process of measuring, do not have to intersect and disturb, the operations such as the filtration that therefore do not need gas is purified.Yet the optical type gas analytical equipment is comparatively expensive, can't be used on a large scale.To sum up analyze, electrochemical gas sensor remains the study hotspot in the gas analysis field.
Summary of the invention
The cross sensitivity shown in the multicomponent gas environment for the current gas sensor overcome in background technology, the utility model provides a kind of low cost, the multicomponent gas monitoring device that utilizes the electric chemical formula gas sensor to be monitored complicated multicomponent gas environment, measuring accuracy is high, wide accommodation.
The utility model specifically solves the problems of the technologies described above by the following technical solutions:
A kind of multicomponent gas monitoring device, comprise gas collecting device, gas cylinder, gas solenoid valve, gas current regulator, electrochemical gas sensor array, gasmetry chamber, energy supply control module, microprocessor, moisture measurement module, temperature-measuring module, display module, its peripheral gas to be measured enters from the gas collecting device; Described gas collecting device is connected with an end of moisture measurement module, temperature-measuring module, gas solenoid valve respectively by gas piping; Described gas cylinder is connected with the other end of gas solenoid valve by gas piping; One end of described gas solenoid valve is connected with an end of gas current regulator; The other end of described gas current regulator closely is connected with the gasmetry chamber; Described electrochemical gas sensor array is arranged on inside, gasmetry chamber, and gas to be measured is discharged by the Waste gas outlet in gasmetry chamber; Described electrochemical gas sensor array is connected with an end, the microprocessor of energy supply control module respectively; The other end of described moisture measurement module, temperature-measuring module, energy supply control module is connected with microprocessor respectively; Described microprocessor is connected with display module.
As a kind of optimal technical scheme of the present utility model: also comprise and measure the cavity well heater, described measurement cavity well heater is positioned at the surface in gasmetry chamber.
As a kind of optimal technical scheme of the present utility model: described gas current regulator is the inner right cylinder that is provided with the circular hole layer.
As a kind of optimal technical scheme of the present utility model: described gasmetry chamber is right cylinder.
As a kind of optimal technical scheme of the present utility model: described gas collecting device inside is provided with the blowback solenoid valve.
This device is connected the gas collecting pipe in the gas collecting device with outside air, and extracts extraneous gas to be measured by the draw-off pump in the gas collecting device.Be full of nitrogen or pure air in gas cylinder as carrier gas, gas solenoid valve is controlled the carrier gas delivery rate.Mixed with gas to be measured from the carrier gas of gas solenoid valve output, be sent to subsequently the gas current regulator.The gas current regulator directly is connected with the gasmetry chamber, and effect is that gas to be measured and carrier gas are carried out to the secondary mixing, and reduces the impact of gas impact on sensor.After electrochemical gas sensor array measurement gas composition to be measured and concentration, gas to be measured gives off whole measurement mechanism by Waste gas outlet.Sensor measurement signal is presented on display module after by microprocessor processes.Microprocessor can also be proofreaied and correct measurement result according to gas humidity to be measured, and according to gas temperature control heater heating-up temperature to be measured.Can carry out On-line monitor and control to carrier gas flux, heating-up temperature, system folding etc. by display module.
The utility model adopts technique scheme can produce following technique effect:
This device adopts a plurality of low-cost electrochemical gas sensors, and, by the calibration algorithm of research and development, electrochemical gas sensor is formed to array, can be monitored multicomponent gas, has avoided the cross sensitivity problem of sensor.In addition, device has adopted and has been easy to the system architecture realized, forms simply, and compact size, can be by widespread adoption.The gas current regulator is the inner right cylinder with the circular hole layer, and aperture is uniformly distributed on cylindrical cross-section, can make to enter the gas uniform of measuring chamber and be transported to the array-type sensor surface.Gasmetry chamber for measurement gas adopts right cylinder, can closely be connected with the gas current regulator.Measure the outer well heater of cavity and heated measuring chamber, thereby improved the multicomponent gas measuring accuracy.With the blowback solenoid valve, can prevent that gas backstreaming to be measured from leaking in the gas collecting device.
Therefore, that this device has designed is small and exquisite, the gasmetry structure of compact conformation, and cost is low, be easy to realize, high, the wide accommodation of measuring accuracy simultaneously can be by widespread adoption.
The accompanying drawing explanation
The structural representation that Fig. 1 is multicomponent gas monitoring device of the present utility model.
The gasmetry chamber that Fig. 2 is multicomponent gas monitoring device of the present utility model and current regulator structural representation.
Wherein label is explained: 1-gas to be measured, 2-gas collecting device, 3-gas piping, 4-gas cylinder, 5-gas solenoid valve, 6-gas current regulator, 7-electrochemical gas sensor array, 8-gasmetry chamber, 9-measure the cavity well heater, the 10-energy supply control module, the 11-microprocessor, 12-moisture measurement module, the 13-temperature-measuring module, the 14-display module.
Embodiment
Below in conjunction with Figure of description, embodiment of the present utility model is described.
As shown in Figure 1, a kind of multicomponent gas monitoring device, comprise gas collecting device 2, gas cylinder 4, gas solenoid valve 5, gas current regulator 6, electrochemical gas sensor array 7, gasmetry chamber 8, energy supply control module 10, microprocessor 11, moisture measurement module 12, temperature-measuring module 13, display module 14, its peripheral gas 1 to be measured enters from gas collecting device 2; Described gas collecting device 2 is connected with an end of moisture measurement module 12, temperature-measuring module 13, gas solenoid valve 5 respectively by gas piping 3; Described gas cylinder 4 is connected with the other end of gas solenoid valve 5 by gas piping 3; One end of described gas solenoid valve 5 is connected with an end of gas current regulator 6; The other end of described gas current regulator 6 closely is connected with gasmetry chamber 8; Described electrochemical gas sensor array 7 is arranged on 8 inside, gasmetry chamber, and gas 1 to be measured is discharged by the Waste gas outlet in gasmetry chamber 8; Described electrochemical gas sensor array 7 is connected with an end, the microprocessor 11 of energy supply control module 10 respectively; The other end of described moisture measurement module 12, temperature-measuring module 13, energy supply control module 10 is connected with microprocessor 11 respectively; Described microprocessor 11 is connected with display module 14.
For gasmetry chamber 8,9 heating of cavity well heater are measured in chamber wall utilization, measure the heater strip of cavity well heater 9 by surface, chamber parcel, and purpose is to improve to measure cavity temperature, prevent that low temperature environment from impacting sensor, and reduce the impact that temperature difference causes measurement.
And gasmetry chamber and current regulator structure are as shown in Figure 2, gas current regulator 6 is inner right cylinders with the circular hole layer, and aperture is uniformly distributed on cylindrical cross-section, can make to enter the gas uniform of measuring chamber and be transported to the array-type sensor surface.Gasmetry chamber 8 for measurement gas adopts right cylinder, can closely be connected with gas current regulator 6.
Specific works process of the present utility model is as follows: this device is connected the gas collecting pipe in gas collecting device 2 with outside air, and extracts extraneous gas 1 to be measured by the draw-off pump in gas collecting device 2.With the blowback solenoid valve, can prevent that gas 1 backflow to be measured from leaking in collection tube.Be full of nitrogen or pure air in gas cylinder 4 as carrier gas, gas solenoid valve 5 is controlled the carrier gas delivery rate.Mixed with the gas to be measured 2 of gas collecting device 2 outputs from the carrier gas of gas solenoid valve 5 outputs, be sent to subsequently gas current regulator 6.Gas current regulator 6 directly is connected with gasmetry chamber 8, and effect is that gas 1 to be measured and carrier gas are carried out to the secondary mixing, and reduces the impact of gas impact on sensor.Electrochemical gas sensor array 7 comprises a plurality of low-cost electrochemical gas sensors, and after a plurality of electrochemical gas sensors are measured gas composition to be measured and concentration, gas to be measured gives off whole measurement mechanism by Waste gas outlet.A plurality of sensor measurement signals are presented on display module 14 after processing by microprocessor 11.Microprocessor 11 can also be proofreaied and correct measurement result according to gas humidity to be measured, and according to gas temperature control heater heating-up temperature to be measured.Can carry out On-line monitor and control to carrier gas flux, heating-up temperature, system folding etc. by display module 14.Wherein, microprocessor is hardware module, as can adopt single-chip microcomputer, NXP-LPC2361 type processor or other etc. there is the hardware of simple data processing capacity.Display module can adopt the LCDs of ST7920 type or other display screen.
Humiture correction principle for moisture measurement module 12 and temperature-measuring module 13 is: electrochemical gas sensor is owing to having adopted chemical principle to carry out gasmetry, and in chemical reaction process, chemical activity can be subject to the impact of ambient humidity, temperature.Hydrone also can impact chemical reaction in the deposition of reaction interface simultaneously.Therefore pass through the measurement to ambient temperature and humidity, and provide humiture to affect parameter according to sensor manufacturer, measurement is carried out to temperature and humidity compensation, just can greatly reduce the impact of humidity on measuring.In addition, because monitoring device of the present invention can be used in various temperature environments, in order to make measurement result, keep consistance preferably, need to guarantee the consistent of gas sensor working temperature environment.Therefore by the measurement to environment temperature, can optimize 11 pairs of gasmetry chamber well heaters 9 of microprocessor and be controlled.Wherein, moisture measurement module 12 and temperature-measuring module 13 are hardware module, can adopt and realize measuring as parts such as the humidity sensor of SHT15 type or temperature sensors.
Electrochemical gas sensor array 7 is comprised of a plurality of electrochemical gas sensors, and electrochemical gas sensor is mainly the redox characteristic that utilizes gas to be measured, by electrochemical reaction, and measure gas concentrations information.Due to pollution gas, usually all with redox characteristic, so the electrochemical signals that multicomponent gas produces can be superposeed in sensor side, and this is also the reason that single electrochemical gas sensor can't carry out the multicomponent gas measurement.Yet different electrochemical gas sensors can reveal different chemical activitys to different gas meters to be measured.The utility model is exactly this characteristic of having utilized electrochemical sensor, by adopting sensor array, has realized the measurement to multicomponent gas.The electrochemical sensor that invention adopts is respectively mainly for different gas to be measured, according to the needs of test environment, as contained CO, H in environment
2The pollution gas such as S, NO, so just adopt for CO, H respectively
2The electrochemical sensor of S, NO, such three kinds of sensors are respectively to CO, H
2The susceptibility of S and NO is higher, lower in various degree to other gas sensitization degree.In the utility model, electrochemical sensor, before employing, at first carries out the active demarcation of sensor, the chemical activity of difference gas to be measured is demarcated, and calibration value adopts identical reference component.Concrete calibration process is as follows:
The CO electrochemical sensor, the sensor output signal numerical value in the pure CO atmosphere of 100ppm concentration is I
A, this sensor is just S to the susceptibility of CO so
A=A/100ppm, in like manner at the pure H of 100ppm concentration
2In S atmosphere, sensor output signal numerical value is I
B, this sensor is to H so
2The susceptibility of S is S
B=B/100ppm.Just can demarcate by this method the susceptibility of this sensor to gas with various.After the susceptibility of sensor has been demarcated, suppose that i is for certain electrochemical gas sensor numbering, I
iFor output signal numerical value corresponding to this sensor, S
IkFor the susceptibility of this sensor to k class gas, C
kFor k class gas concentration, for the multicomponent gas environment, meet so:
I
1?=?S
11C
1?+?S
12C
2?+?S
13C
3?+…
The output signal numerical value of No. 1 sensor is respectively this sensor to C
1, C
2, C
3Stack etc. the corresponding output signal of gas concentration.Because different types of gas sensor has different chemical activitys to gas with various, so
I
2?=?S
21C
1?+?S
22C
2?+?S
23C
3?+…
I
3?=?S
31C
1?+?S
32C
2?+?S
33C
3?+…
…
I
i?=?S
i1C
1?+?S
i2C
2?+?S
i3C
3?+…
Like this according to known quantity measurement value sensor I
1, I
2I
i, and the susceptibility S of sensor
IkNumerical value, just can draw by numerical analysis gas componant and the respective concentration information C of multicomponent gas environment.
Therefore, this device adopts low-cost electrochemical gas sensor, and, by the calibration algorithm of research and development, electrochemical gas sensor is formed to array, can be monitored multicomponent gas, has avoided the cross sensitivity problem of sensor; The gas controlling device of invention has adopted and has been easy to the framework of realizing in addition, forms simply, and compact size, improved the multicomponent gas measuring accuracy, can be by widespread adoption.
The above is explained in detail embodiment of the present utility model by reference to the accompanying drawings, but the utility model is not limited to above-mentioned embodiment, in the ken possessed those of ordinary skills, can also under the prerequisite that does not break away from the utility model aim, make a variety of changes.
Claims (5)
1. a multicomponent gas monitoring device, it is characterized in that: comprise gas collecting device (2), gas cylinder (4), gas solenoid valve (5), gas current regulator (6), electrochemical gas sensor array (7), gasmetry chamber (8), energy supply control module (10), microprocessor (11), moisture measurement module (12), temperature-measuring module (13), display module (14) for powering, its peripheral gas to be measured (1) enters from gas collecting device (2); Described gas collecting device (2) is connected with an end of moisture measurement module (12), temperature-measuring module (13), gas solenoid valve (5) respectively by gas piping (3); Described gas cylinder (4) is connected with the other end of gas solenoid valve (5) by gas piping (3); One end of described gas solenoid valve (5) is connected with an end of gas current regulator (6); The other end of described gas current regulator (6) closely is connected with gasmetry chamber (8); Described electrochemical gas sensor array (7) is arranged on inside, gasmetry chamber (8), and gas to be measured is discharged by the Waste gas outlet of gasmetry chamber (8); Described electrochemical gas sensor array (7) is connected with an end, the microprocessor (11) of energy supply control module (10) respectively; The other end of described moisture measurement module (12), temperature-measuring module (13), energy supply control module (10) is connected with microprocessor (11) respectively; Described microprocessor (11) is connected with display module (14).
2. multicomponent gas monitoring device according to claim 1 is characterized in that: also comprise and measure cavity well heater (9), described measurement cavity well heater (9) is positioned at the surface of gasmetry chamber (8).
3. multicomponent gas monitoring device according to claim 1 and 2 is characterized in that: described gas current regulator (6) is the inner right cylinder that is provided with the circular hole layer.
4. multicomponent gas monitoring device according to claim 1 and 2 is characterized in that: described gasmetry chamber (8) is right cylinder.
5. multicomponent gas monitoring device according to claim 1 and 2, it is characterized in that: described gas collecting device (2) inside is provided with the blowback solenoid valve.
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| CN2013203576220U CN203324220U (en) | 2013-06-21 | 2013-06-21 | Multi-component gas monitoring device |
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|---|---|---|---|
| CN2013203576220U CN203324220U (en) | 2013-06-21 | 2013-06-21 | Multi-component gas monitoring device |
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| CN103913546A (en) * | 2014-04-02 | 2014-07-09 | 太仓华风环保科技有限公司 | High-precision probe |
| CN104280427A (en) * | 2014-08-18 | 2015-01-14 | 华南农业大学 | Pressure enrichment type low-concentration gas volatile electronic-nose detection system |
| CN104459026A (en) * | 2014-04-02 | 2015-03-25 | 太仓华风环保科技有限公司 | Constant-temperature probe |
| CN105158411A (en) * | 2015-06-23 | 2015-12-16 | 中山欧麦克仪器设备有限公司 | Multi-parameter gas detector |
| CN105158410A (en) * | 2015-06-23 | 2015-12-16 | 中山欧麦克仪器设备有限公司 | Multichannel gas detector capable of realizing wireless output |
| CN105973954A (en) * | 2016-07-20 | 2016-09-28 | 力合科技（湖南）股份有限公司 | Oxygen content calibration gas sampling device and online oxygen content calibration method |
| CN107132256A (en) * | 2017-06-29 | 2017-09-05 | 苏州曼德克光电有限公司 | A kind of electrochemical process carbonomonoxide concentration detection means |
| CN109357699A (en) * | 2018-11-05 | 2019-02-19 | 河南省日立信股份有限公司 | A kind of multisensor array, which intersects, to be solved and its detection method |
| CN110057894A (en) * | 2019-04-01 | 2019-07-26 | 安徽理工大学 | Urban atmosphere monitoring device based on electrochemical sensing technology |
| CN110455988A (en) * | 2019-07-15 | 2019-11-15 | 山东五岳电器有限公司 | Sensor array calculation method and system, monitor and monitoring method based on gas content in transformer insulation oil |
| CN110726760A (en) * | 2019-10-23 | 2020-01-24 | 山东交通学院 | Ship mechanism with tail gas sensing device |
| CN111696322A (en) * | 2020-04-22 | 2020-09-22 | 湖北民族大学 | Composite gas monitoring method and device, computer terminal and readable storage medium |
| CN111982203A (en) * | 2020-09-02 | 2020-11-24 | 四川天微电子股份有限公司 | Double-chamber multifunctional pump suction type environment detector |
| CN112162060A (en) * | 2020-09-07 | 2021-01-01 | 天地（常州）自动化股份有限公司 | Intelligent interference testing device and method for coal mine gas sensor |
| CN112666241A (en) * | 2020-12-28 | 2021-04-16 | 北京首创大气环境科技股份有限公司 | Regional TVOC monitoring method |
| FR3103892A1 (en) * | 2019-12-01 | 2021-06-04 | Elichens | Device and method for calibrating a gas sensor |
| CN113267533A (en) * | 2021-05-18 | 2021-08-17 | 浙江大学 | Device and method for dynamically monitoring VOCs (volatile organic chemicals) on line by self-calibration gas sensor array |
| CN113671119A (en) * | 2021-08-02 | 2021-11-19 | 德尔格安全设备（中国）有限公司 | Gas detection device and temperature compensation method thereof |
| CN115236147A (en) * | 2022-06-28 | 2022-10-25 | 浙江缘森生态环境科技有限公司 | Gas content monitoring device for automobile exhaust and using method |
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2013
- 2013-06-21 CN CN2013203576220U patent/CN203324220U/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103913546B (en) * | 2014-04-02 | 2016-07-06 | 太仓华风环保科技有限公司 | A kind of high accuracy probe |
| CN104459026A (en) * | 2014-04-02 | 2015-03-25 | 太仓华风环保科技有限公司 | Constant-temperature probe |
| CN103913546A (en) * | 2014-04-02 | 2014-07-09 | 太仓华风环保科技有限公司 | High-precision probe |
| CN104459026B (en) * | 2014-04-02 | 2016-07-06 | 太仓华风环保科技有限公司 | A kind of thermostat probe |
| CN104280427A (en) * | 2014-08-18 | 2015-01-14 | 华南农业大学 | Pressure enrichment type low-concentration gas volatile electronic-nose detection system |
| CN105158411A (en) * | 2015-06-23 | 2015-12-16 | 中山欧麦克仪器设备有限公司 | Multi-parameter gas detector |
| CN105158410A (en) * | 2015-06-23 | 2015-12-16 | 中山欧麦克仪器设备有限公司 | Multichannel gas detector capable of realizing wireless output |
| CN105973954A (en) * | 2016-07-20 | 2016-09-28 | 力合科技（湖南）股份有限公司 | Oxygen content calibration gas sampling device and online oxygen content calibration method |
| CN107132256A (en) * | 2017-06-29 | 2017-09-05 | 苏州曼德克光电有限公司 | A kind of electrochemical process carbonomonoxide concentration detection means |
| CN109357699A (en) * | 2018-11-05 | 2019-02-19 | 河南省日立信股份有限公司 | A kind of multisensor array, which intersects, to be solved and its detection method |
| CN110057894A (en) * | 2019-04-01 | 2019-07-26 | 安徽理工大学 | Urban atmosphere monitoring device based on electrochemical sensing technology |
| CN110455988A (en) * | 2019-07-15 | 2019-11-15 | 山东五岳电器有限公司 | Sensor array calculation method and system, monitor and monitoring method based on gas content in transformer insulation oil |
| CN110455988B (en) * | 2019-07-15 | 2022-02-08 | 山东五岳电器有限公司 | Sensor array calculation method and system based on gas content in transformer insulating oil, monitor and monitoring method |
| CN110726760A (en) * | 2019-10-23 | 2020-01-24 | 山东交通学院 | Ship mechanism with tail gas sensing device |
| FR3103892A1 (en) * | 2019-12-01 | 2021-06-04 | Elichens | Device and method for calibrating a gas sensor |
| CN111696322A (en) * | 2020-04-22 | 2020-09-22 | 湖北民族大学 | Composite gas monitoring method and device, computer terminal and readable storage medium |
| CN111982203A (en) * | 2020-09-02 | 2020-11-24 | 四川天微电子股份有限公司 | Double-chamber multifunctional pump suction type environment detector |
| CN112162060A (en) * | 2020-09-07 | 2021-01-01 | 天地（常州）自动化股份有限公司 | Intelligent interference testing device and method for coal mine gas sensor |
| CN112666241A (en) * | 2020-12-28 | 2021-04-16 | 北京首创大气环境科技股份有限公司 | Regional TVOC monitoring method |
| CN112666241B (en) * | 2020-12-28 | 2023-08-22 | 北京首创大气环境科技股份有限公司 | Regional TVOC monitoring method |
| CN113267533A (en) * | 2021-05-18 | 2021-08-17 | 浙江大学 | Device and method for dynamically monitoring VOCs (volatile organic chemicals) on line by self-calibration gas sensor array |
| CN113671119A (en) * | 2021-08-02 | 2021-11-19 | 德尔格安全设备（中国）有限公司 | Gas detection device and temperature compensation method thereof |
| CN115236147A (en) * | 2022-06-28 | 2022-10-25 | 浙江缘森生态环境科技有限公司 | Gas content monitoring device for automobile exhaust and using method |
| CN115236147B (en) * | 2022-06-28 | 2023-11-21 | 浙江缘森生态环境科技有限公司 | Gas content monitoring device for automobile exhaust and use method |
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