Carbon monoxide sensor and detection method resistant to interference from multiple gases

Abstract

The present application relates to a kind of carbon monoxide sensor with resistance to multiple gas and detection method, belong to coal mine environment gas detection sensor field.The present application includes carbon monoxide sensor, and the method of gas detection of the sensor.Therein, sensor mainly includes carbon monoxide / hydrogen sulfide dual gas detection module, nitrogen oxide detection module, modular mainboard, main shell and main shell display window, wherein carbon monoxide / hydrogen sulfide dual gas detection module and nitrogen oxide detection module measure the gas to be measured.The present application carries out gas concentration value calculation using cross interference compensation algorithm, and the concentration of carbon monoxide gas in coal mine environment is accurately detected by setting different working modes.The present application realizes the real-time monitoring of carbon monoxide, nitrogen oxide and hydrogen sulfide multi-component gas concentration by carbon monoxide, nitrogen oxide, hydrogen sulfide composite electrochemical element design, improves the precise perception ability of intelligent mine, and guarantees coal mine safety production.

Description

Technical Field

[0001] This invention belongs to the field of coal mine environmental gas detection, and relates to a carbon monoxide sensor and detection method that is resistant to multiple gases. Background Technology

[0002] Carbon monoxide (CO) sensors, as the primary instrument for monitoring CO gas concentration in coal mines, play a crucial role in early fire warning and are currently the most mature and widely used fire early warning and monitoring method. With the development of intelligent mining, accurate detection has become an essential requirement for intelligent sensors. However, with the construction of high-yield and high-efficiency mines, the number of underground rubber-wheeled vehicles is increasing. Their exhaust gases contain hydrocarbons, nitrogen oxides, sulfur dioxide, carbon monoxide, and particulate matter (including certain heavy metal compounds, lead compounds, black smoke, and oil mist). Nitrogen oxides, in particular, cause cross-interference with CO sensors, leading to frequent false alarms and severely disrupting normal coal mine production.

[0003] Currently, infrared carbon monoxide sensors have been designed in the domestic industrial detection field. However, these sensors have large gas chambers and long optical paths, making miniaturization impossible. Furthermore, they suffer from gas cross-interference, hindering the development of intrinsically safe instruments for mining applications. Laser-based carbon monoxide sensors are limited by factors such as laser customization, optical structure design, and cost, resulting in the lack of engineering prototypes with practical application value. Currently, all manufacturers' carbon monoxide sensors use a single electrochemical sensing element to detect ambient gas concentrations. When exhaust fumes from rubber-tired vehicles or hydrogen sulfide are present in the environment, the sensors will generate false alarms, severely impacting the effectiveness of monitoring and causing confusion and difficulties for mine operators and regulatory departments, ultimately affecting safe coal mine production. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a carbon monoxide sensor and detection method that is resistant to interference from multiple gases, mainly to solve the industry problem of the influence of exhaust gas from underground rubber-tired vehicles and sulfur-containing gases on the accuracy of carbon monoxide sensor detection results, and to achieve accurate detection of carbon monoxide gas concentration in coal mines.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A carbon monoxide sensor resistant to interference from multiple gases includes a carbon monoxide / hydrogen sulfide dual-gas detection module, a nitrogen oxide detection module, a main housing 1, a rear cover 2, an aviation socket 3, a modular motherboard 4, a buzzer cavity 5, a sealing waterproof rubber ring 7, a lampshade base assembly 8, a lower protective cover 11, a front nameplate 13, a rear nameplate 14, a coal mine safety sign 15, a first vent 16, a second vent 17, and a main housing display window 18;

[0007] The carbon monoxide / hydrogen sulfide dual-gas detection module and the nitrogen oxide detection module can simultaneously measure the concentration of carbon monoxide, hydrogen sulfide and nitrogen oxide gases in the environment. The initial gas concentration measurement value is transmitted to the modular motherboard 4. After calculation by the cross-interference compensation detection method in the modular motherboard 4, the actual gas concentration value is displayed through the main housing display window 18 and uploaded to the monitoring substation.

[0008] Optionally, the carbon monoxide / hydrogen sulfide dual-gas detection module includes a gas detection element and a signal processing circuit;

[0009] The gas detection element includes an integrated electrochemical carbon monoxide and hydrogen sulfide dual-gas detection element; or it includes an electrochemical carbon monoxide gas detection element and an electrochemical hydrogen sulfide gas detection element.

[0010] The nitrogen oxide detection module includes an electrochemical nitrogen oxide gas detection element and a signal processing circuit.

[0011] The electrochemical nitrogen oxide gas detection element is either a nitric oxide gas detection element or a nitrogen dioxide gas detection element.

[0012] Optionally, the gas concentration value displayed in the main housing display window 18 must include the carbon monoxide gas concentration, and can also be selected to alternately display either the hydrogen sulfide gas concentration or the nitrogen oxide gas concentration, or both alternately.

[0013] Optionally, the sensor also includes a main housing 1, a rear cover 2, a buzzer cavity 5, a lampshade base assembly 8, and a lower protective cover 11;

[0014] The modular motherboard 4 is fixed inside the main housing 1; the rear cover 2 is fixed to the main housing 1, and a sealing waterproof rubber ring 7 is formed between the rear cover 2 and the main housing 1; the lampshade base assembly 8 is fixed to the bottom of the main housing 1; the lower cover 11 is fixed to the bottom of the main housing 1.

[0015] Optionally, the modular motherboard 4 includes a voltage conversion circuit, a microprocessor, a communication circuit, a gas detection module communication interface circuit, a remote control receiving circuit, an audible and visual alarm circuit, and a display circuit.

[0016] The microprocessor is interconnected with the communication circuit and the gas detection module communication interface circuit, and is also connected to the voltage conversion circuit, remote control receiving circuit, display circuit and audible and visual alarm circuit.

[0017] Optionally, the audible and visual alarm circuit is connected to the light-emitting lamp and the buzzer cavity 5 inside the lampshade base assembly 8, controlling the light-emitting lamp to perform intermittent visual alarms and controlling the buzzer cavity 5 to perform intermittent audible alarms.

[0018] Optionally, the carbon monoxide / hydrogen sulfide dual-gas detection module is interconnected with the communication interface circuit of the gas detection module; the nitrogen oxide detection module is interconnected with the communication interface circuit of the gas detection module.

[0019] Optionally, the cross-interference compensation detection method includes the following steps:

[0020] S1: Set the cross-interference compensation intensity to Q, which has three intensity working modes: 0, 1, and 2. Set the nitrogen oxide compensation start value N1, the strong interference threshold N2, and the nitrogen oxide detection module gas detection response time T1.

[0021] S2: The carbon monoxide / hydrogen sulfide dual gas detection module and the nitrogen oxide detection module sample and calculate the gas sample to be measured, and obtain the initial value of carbon monoxide gas concentration A0, hydrogen sulfide gas concentration value B0, and nitrogen oxide gas concentration value C0. The values ​​are uploaded to the microprocessor on the modular motherboard 4 for processing.

[0022] S3: Select the appropriate working mode with the corresponding Q value according to the characteristics of the sensor's operating environment, and the sensor calculates the carbon monoxide gas concentration in the gas sample to be measured;

[0023] S4: Convert the current signals of the carbon monoxide / hydrogen sulfide dual gas detection module and the nitrogen oxide dual gas detection module into voltage signals, perform A / D sampling conversion in the microprocessor, and calculate the gas concentration values ​​of hydrogen sulfide and nitrogen oxides.

[0024] S5: Repeat steps S2 to S4 to continuously measure the actual concentration values ​​of carbon monoxide, hydrogen sulfide, and nitrogen oxides in the gas sample to be measured and update the display output.

[0025] Furthermore, in step S1, the nitrogen oxide compensation start-up value range is: 4ppm≤N1≤10ppm; the strong interference threshold range is: 30ppm≤N2≤50ppm; and the nitrogen oxide detection module gas detection response time range is: 30s≤T1≤300s.

[0026] Furthermore, in step S3, the sensor selects the operating mode according to the following rules:

[0027] When hydrogen sulfide gas is not present in the environment, or when the carbon monoxide / hydrogen sulfide dual gas detection module contains hydrogen sulfide gas filter, Q is 0. The sensor adopts a weak cross-interference compensation working mode. The sensor calculates the actual concentration value of carbon monoxide gas in the gas to be measured, A1 = A0 - α × C0, where α is the cross-interference coefficient, and its range is 0.1 ≤ α ≤ 3.

[0028] When there are intermittent low concentrations of hydrogen sulfide gas and nitrogen oxide gas in the environment, and the gas detection elements in the carbon monoxide / hydrogen sulfide dual-gas detection module are affected by hydrogen sulfide gas and nitrogen oxide gas, Q is 1, and the sensor adopts the medium cross-interference compensation working mode. The sensor calculates the actual concentration value A1 of carbon monoxide gas in the gas to be measured as A1 = A0 - α×C0 - γ×B0, where γ is the cross-interference coefficient, and its range is 0.1 ≤ γ ≤ 4;

[0029] When there are intermittent high concentrations of hydrogen sulfide gas and nitrogen oxide gas in the environment, and the gas detection elements in the carbon monoxide / hydrogen sulfide dual-gas detection module are affected by hydrogen sulfide gas and nitrogen oxide gas, Q is 2, and the sensor adopts the strong cross-interference compensation working mode; among them, when C0 ≥ N1, the timer is started to record the sensor detection time t. When t < T1 and C0 < N2, A1 = 0; when t > T1 or C0 ≥ N2, the actual concentration value A1 of carbon monoxide gas is A1 = A0 - α×C0 - γ×B0.

[0030] The beneficial effects of the present invention are as follows: Through the design of a carbon monoxide, nitrogen oxide, and hydrogen sulfide composite electrochemical element, it not only realizes the accurate detection of the concentration of carbon monoxide gas but also realizes the real-time monitoring of the concentrations of multi-component gases such as nitrogen oxide, a marker gas of the exhaust gas of underground rubber-tyred vehicles, and hydrogen sulfide, a marker gas of sulfur-containing gases. And through the corresponding cross-interference compensation detection method, different cross-interference compensation intensities are set according to the characteristics of the on-site environment to achieve real-time and accurate detection of the carbon monoxide concentration in environments such as the exhaust gas of underground rubber-tyred vehicles and sulfur-containing working face roadways in coal mines, eliminate the false alarms of carbon monoxide sensors caused by the interference of multiple gases, improve the accurate perception ability of intelligent mines, and ensure the safe production of coal mines.

[0031] Other advantages, objectives, and features of the present invention will be described in part in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail preferably with reference to the accompanying drawings, where:

[0033] Figure 1 Front view of the structure of a carbon monoxide sensor for resisting interference from multiple gases;

[0034] Figure 2 Bottom view of the structure of a carbon monoxide sensor for resisting interference from multiple gases;

[0035] Figure 3Side view of a carbon monoxide sensor structure resistant to interference from multiple gases;

[0036] Figure 4 Rear view of the structure of a carbon monoxide sensor resistant to interference from multiple gases;

[0037] Figure 5 Electrical schematic diagram of the sensor;

[0038] Figure 6 This is a method for detecting cross-interference compensation.

[0039] Reference numerals: 1. Main housing; 2. Rear cover; 3. Aviation socket; 4. Modular motherboard; 5. Buzzer cavity; 6. Screw I; 7. Sealing waterproof ring; 8. Lampshade base assembly; 9. Screw II; 10. Screw III; 11. Lower cover; 12. Screw IV; 13. Front nameplate; 14. Rear nameplate; 15. Coal safety sign; 16. Vent; 17. Vent; 18. Main housing display screen. Detailed Implementation

[0040] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0041] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures, and should not be construed as limiting the invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0042] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of 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, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0043] Please see Figures 1-6 This invention relates to a carbon monoxide sensor and detection method resistant to interference from multiple gases.

[0044] A carbon monoxide sensor and detection method resistant to interference from multiple gases are disclosed. This invention performs composite detection of the sensor's target carbon monoxide gas, nitrogen oxides (a marker gas in underground rubber-tired vehicle exhaust), and hydrogen sulfide (a marker gas for sulfur-containing gases), and then performs cross-interference compensation algorithm calculation.

[0045] The carbon monoxide sensor includes a carbon monoxide / hydrogen sulfide dual-gas detection module, a nitrogen oxide detection module, a main housing 1, a rear cover 2, an aviation socket 3, a modular motherboard 4, a buzzer cavity 5, a sealing waterproof rubber ring 7, a lampshade base assembly 8, a lower protective cover 11, a front nameplate 13, a rear nameplate 14, a coal mine safety sign 15, a first vent 16, a second vent 17, and a main housing display window 18.

[0046] The system includes two detection modules that simultaneously monitor the concentrations of carbon monoxide, hydrogen sulfide, and nitrogen oxides in the environment. The carbon monoxide / hydrogen sulfide dual-gas detection module measures the gas entering through vent 16, while the nitrogen oxide detection module measures the gas entering through vent 17. The concentration measurements are transmitted to the modular motherboard 4, where they are calculated using a sensor cross-interference compensation method. The actual gas concentration is then displayed on the main housing display window 18 and uploaded to the monitoring substation via a communication interface.

[0047] The carbon monoxide / hydrogen sulfide dual-gas detection module is fixed in the lamp cover base assembly 8 and consists of a gas detection element and a signal processing circuit. There are two options for the gas detection element: one is an integrated electrochemical carbon monoxide and hydrogen sulfide dual-gas detection element; the other is two elements, including an electrochemical carbon monoxide gas detection element and an electrochemical hydrogen sulfide gas detection element.

[0048] The nitrogen oxide detection module is fixed in the lamp cover base assembly 8 and consists of an electrochemical nitrogen oxide gas detection element and a signal processing circuit. The electrochemical nitrogen oxide gas detection element is preferably a nitric oxide gas detection element, but it can also be a nitrogen dioxide gas detection element.

[0049] The modular motherboard 4 is fixed to the main housing 1 by screw I6, the lampshade base assembly 8 is fixed to the main housing 1 by screw II9, the lower cover 11 is fixed to the main housing 1 by screw III10, and a sealing waterproof rubber ring 7 is surrounded between the rear cover 2 and the main housing 1 and fixed to the main housing 1 by screw IV12.

[0050] The modular motherboard 4 includes a voltage conversion circuit, a microprocessor, a communication circuit, a gas detection module communication interface circuit, a remote control receiver circuit, an audible and visual alarm circuit, and a display circuit. The microprocessor is interconnected with the communication circuit and the gas detection module communication interface circuit, and is also connected to the voltage conversion circuit, the remote control receiver circuit, the display circuit, and the audible and visual alarm circuit. The audible and visual alarm circuit is connected to the LED and buzzer cavity 5 within the lamp base assembly 8, and can control the LED to provide intermittent visual alarms and the buzzer cavity 5 to provide intermittent audible alarms. The display circuit includes a display device for displaying the carbon monoxide gas concentration value; optionally, it can alternately display the hydrogen sulfide gas concentration, or the nitrogen oxide gas concentration, or alternately display both. The main housing display window 18 is a transparent plastic component, positioned on the main housing corresponding to the display device, allowing the content of the display device to be viewed through the window.

[0051] The carbon monoxide / hydrogen sulfide dual-gas detection module is interconnected with the communication interface circuit of the gas detection module, and the nitrogen oxide detection module is interconnected with the communication interface circuit of the gas detection module.

[0052] In this embodiment, the gas detection element in the carbon monoxide / hydrogen sulfide dual-gas detection module is preferably an electrochemical carbon monoxide / hydrogen sulfide dual-gas integrated gas detection element, model GS+4DT; the gas detection element in the nitrogen oxide detection module is preferably a nitric oxide gas detection element, model GS+4NO; and the microprocessor on the modular motherboard is preferably model TM4C123GE6PZ.

[0053] The following explains the cross-interference compensation detection method, such as... Figure 6 As shown, the method includes the following steps:

[0054] S1: Set the cross-interference compensation intensity to Q, which has three intensity working modes: 0, 1, and 2. Set the nitrogen oxide compensation start value N1, the strong interference threshold N2, and the nitrogen oxide detection module gas detection response time T1.

[0055] The nitrogen oxide compensation start-up value range is: 4ppm≤N1≤10ppm; the strong interference threshold range is: 30ppm≤N2≤50ppm; and the nitrogen oxide detection module gas detection response time range is: 30s≤T1≤300s.

[0056] S2: The carbon monoxide / hydrogen sulfide dual gas detection module and the nitrogen oxide detection module sample and calculate the gas sample to be measured, and obtain the initial value of carbon monoxide gas concentration A0, hydrogen sulfide gas concentration value B0, and nitrogen oxide gas concentration value C0. The values ​​are uploaded to the microprocessor on the modular motherboard 4 for processing.

[0057] S3: According to the characteristics of the sensor's usage environment, select the working mode at the corresponding Q value, and the sensor calculates the concentration of carbon monoxide gas in the gas sample to be measured;

[0058] When there is no hydrogen sulfide gas in the environment, or the carbon monoxide / hydrogen sulfide dual-gas detection module contains a hydrogen sulfide gas filter (the filter can neutralize hydrogen sulfide gas to eliminate the influence of hydrogen sulfide gas on the detected concentration value of carbon monoxide gas), Q is 0, and the sensor adopts the weak cross-interference compensation working mode. The sensor calculates the actual concentration value A1 of carbon monoxide gas in the gas to be measured as A1 = A0 - α × C0, where α is the cross-interference coefficient, and the range is 0.1 ≤ α ≤ 3;

[0059] When there are intermittently low concentrations of hydrogen sulfide gas and nitrogen oxide gas in the environment, and the gas detection element in the carbon monoxide / hydrogen sulfide dual-gas detection module is affected by hydrogen sulfide gas and nitrogen oxide gas, Q is 1, and the sensor adopts the medium cross-interference compensation working mode. The sensor calculates the actual concentration value A1 of carbon monoxide gas in the gas to be measured as A1 = A0 - α × C0 - γ × B0, where γ is the cross-interference coefficient, and the range is 0.1 ≤ γ ≤ 4;

[0060] When there are intermittently high concentrations of hydrogen sulfide gas and nitrogen oxide gas in the environment, and the gas detection element in the carbon monoxide / hydrogen sulfide dual-gas detection module is affected by hydrogen sulfide gas and nitrogen oxide gas, Q is 2, and the sensor adopts the strong cross-interference compensation working mode. When C0 ≥ N1, start the timer to record the sensor detection time t. If t < T1 and C0 < N2, A1 = 0; if t > T1 or C0 ≥ N②, the actual concentration value A1 of carbon monoxide gas is A1 = A0 - α × C0 - γ × B0

[0061] S4: Convert the current signals of the carbon monoxide / hydrogen sulfide dual-gas detection module and the nitrogen oxide detection module into voltage signals, perform A / D sampling conversion in the microprocessor, and calculate the gas concentration values of hydrogen sulfide and nitrogen oxide;

[0062] S5: Repeat steps S2 to S4, continuously measure the actual concentration values of carbon monoxide, hydrogen sulfide, and nitrogen oxide gases in the gas sample to be measured, and update the display output.

[0063] The compensation start value N1 and the gas detection response time T1 of the nitrogen oxide detection module are to avoid the phenomenon of over-compensation when the sensor is in the strong cross-interference compensation working mode due to detecting high-concentration nitrogen oxide gas, and to eliminate the measurement abnormality caused by the short-term high-concentration nitrogen oxide gas aggregation such as the exhaust gas of the rubber-tyred vehicle.

[0064] The strong interference threshold N2 generally corresponds to the safe concentration of nitrogen oxide gas that the human body can tolerate in the environment. This prevents the sensor from failing to alarm when there is a high concentration of nitrogen oxide gas in the environment, which could lead to poisoning of personnel.

[0065] The specific values ​​of parameters N1, N2, T1, α, and γ are related to the model of the electrochemical carbon monoxide, hydrogen sulfide, and nitrogen oxide elements. After determining the model of the element, the specific values ​​of the above parameters are generally determined by referring to the element's technical specifications or by experimental methods. At the same time, users are also allowed to adjust and set the above parameters of the sensor.

[0066] Consult the component's technical specifications: the value of N1 should be between 1 and 2.5 times the minimum basic error; N2 generally corresponds to the safe concentration of nitrogen oxide gas in an environment that the human body can tolerate; the value of T1 should be between 0.5 and 2 times the response time.

[0067] The experimental method is as follows:

[0068] Based on the calibrated sensor, nitrogen oxide gas with a concentration of 100 ppm was introduced into the carbon monoxide / hydrogen sulfide dual-gas detection module. The carbon monoxide / hydrogen sulfide dual-gas detection module obtained an initial carbon monoxide gas concentration of P0. When nitrogen oxide gas with a concentration of 100 ppm was introduced into the nitrogen oxide detection module, the initial nitrogen oxide gas concentration obtained was P1.

[0069] When hydrogen sulfide gas at a concentration of 100 ppm is introduced into the carbon monoxide / hydrogen sulfide dual-gas detection module, the module obtains an initial carbon monoxide gas concentration value of P2 and a hydrogen sulfide gas concentration value of P3.

[0070] In this embodiment, the integrated electrochemical carbon monoxide / hydrogen sulfide gas detection element is model GS+4DT, the electrochemical nitrogen oxide gas detection element is model GS+4NO, N1 = 6ppm, N2 = 30ppm, T1 = 40s, α = 0.1, and γ = 0.25.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A carbon monoxide sensor resistant to interference from multiple gases, characterized in that: It includes a carbon monoxide / hydrogen sulfide dual gas detection module, a nitrogen oxide detection module, a modular motherboard (4), and a main housing display window (18). The carbon monoxide / hydrogen sulfide dual gas detection module and the nitrogen oxide detection module can simultaneously measure the concentration of carbon monoxide, hydrogen sulfide and nitrogen oxide gases in the environment. The initial gas concentration measurement value is transmitted to the modular motherboard (4). After calculation by the cross-interference compensation detection method in the modular motherboard (4), the actual gas concentration value is displayed through the main shell display window (18) and uploaded to the monitoring substation. The cross-interference compensation detection method includes the following steps: S1: Set the cross-interference compensation intensity to Q, which has three intensity modes: 0, 1, and 2. Also set the nitrogen oxide compensation start value. Strong interference threshold and nitrogen oxide detection module gas detection response time ; S2: The carbon monoxide / hydrogen sulfide dual-gas detection module and the nitrogen oxide detection module sample and calculate the gas sample to be measured, obtaining the initial value of carbon monoxide gas concentration. hydrogen sulfide gas concentration value nitrogen oxide gas concentration value The values ​​are uploaded to the microprocessor on the modular motherboard (4) for processing; S3: Based on the characteristics of the sensor's operating environment, select the appropriate operating mode with the corresponding Q value. The sensor calculates the carbon monoxide concentration in the gas sample to be measured. The sensor selects the operating mode according to the following rules: When hydrogen sulfide gas is not present in the environment, or when the carbon monoxide / hydrogen sulfide dual-gas detection module contains hydrogen sulfide gas filter, Q is 0, the sensor adopts a weak cross-interference compensation working mode, and the sensor calculates the actual concentration of carbon monoxide gas in the gas to be measured. ,in This is the cross-interference coefficient; When low concentrations of hydrogen sulfide and nitrogen oxides are intermittently present in the environment, and the gas detection element in the carbon monoxide / hydrogen sulfide dual-gas detection module is affected by hydrogen sulfide and nitrogen oxides, Q is 1. The sensor adopts a cross-interference compensation mode, and the sensor calculates the actual concentration of carbon monoxide in the gas to be measured. ,in This is the cross-interference coefficient; When high concentrations of hydrogen sulfide and nitrogen oxides are intermittently present in the environment, and the gas detection element in the carbon monoxide / hydrogen sulfide dual-gas detection module is affected by hydrogen sulfide and nitrogen oxides, Q is 2, and the sensor adopts a strong cross-interference compensation working mode; where, when Start the timer to record the sensor detection time. ,when and hour, ;when or At that time, the actual concentration value of carbon monoxide gas ; S4: Convert the current signals of the carbon monoxide / hydrogen sulfide dual gas detection module and the nitrogen oxide dual gas detection module into voltage signals, perform A / D sampling conversion in the microprocessor, and calculate the gas concentration values ​​of hydrogen sulfide and nitrogen oxides. S5: Repeat steps S2 to S4 to continuously measure the actual concentration values ​​of carbon monoxide, hydrogen sulfide and nitrogen oxides in the gas sample to be measured and update the display output.

2. The carbon monoxide sensor resistant to interference from multiple gases according to claim 1, characterized in that: The carbon monoxide / hydrogen sulfide dual-gas detection module includes a gas detection element and a signal processing circuit. The gas detection element includes an integrated electrochemical carbon monoxide and hydrogen sulfide dual-gas detection element; or it includes an electrochemical carbon monoxide gas detection element and an electrochemical hydrogen sulfide gas detection element. The nitrogen oxide detection module includes an electrochemical nitrogen oxide gas detection element and a signal processing circuit. The electrochemical nitrogen oxide gas detection element is either a nitric oxide gas detection element or a nitrogen dioxide gas detection element.

3. A carbon monoxide sensor resistant to interference from multiple gases according to claim 1, characterized in that: The gas concentration value displayed by the main housing display window (18) must include the carbon monoxide gas concentration, and can also be selected to alternately display either the hydrogen sulfide gas concentration or the nitrogen oxide gas concentration, or both can be displayed alternately.

4. A carbon monoxide sensor resistant to interference from multiple gases according to claim 1, characterized in that: The sensor also includes a main housing (1), a rear cover (2), a buzzer cavity (5), a lampshade base assembly (8), and a lower cover (11). The modular motherboard (4) is fixed inside the main housing (1); the rear cover (2) is fixed to the main housing (1) and a sealing waterproof rubber ring (7) is formed between it and the main housing (1); the lampshade base assembly (8) is fixed to the bottom of the main housing (1); the lower cover (11) is fixed to the bottom of the main housing (1).

5. A carbon monoxide sensor resistant to interference from multiple gases according to claim 4, characterized in that: The modular motherboard (4) includes a voltage conversion circuit, a microprocessor, a communication circuit, a gas detection module communication interface circuit, a remote control receiving circuit, an audible and visual alarm circuit, and a display circuit. The microprocessor is interconnected with the communication circuit and the gas detection module communication interface circuit, and is also connected to the voltage conversion circuit, remote control receiving circuit, display circuit and audible and visual alarm circuit.

6. A carbon monoxide sensor resistant to interference from multiple gases according to claim 5, characterized in that: The sound and light alarm circuit is connected to the light lamp and the buzzer cavity (5) in the lamp base assembly (8), controlling the light lamp to perform intermittent light alarm and controlling the buzzer cavity (5) to perform intermittent sound alarm.

7. A carbon monoxide sensor resistant to interference from multiple gases according to claim 5, characterized in that: The carbon monoxide / hydrogen sulfide dual-gas detection module is interconnected with the communication interface circuit of the gas detection module; the nitrogen oxide detection module is interconnected with the communication interface circuit of the gas detection module.

8. A carbon monoxide sensor resistant to interference from multiple gases according to claim 1, characterized in that: In step S1, the nitrogen oxide compensation start-up value range is: The strong interference threshold range is: The gas detection response time range of the nitrogen oxide detection module is: .

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