Gas concentration detection sensor and detection method thereof

Abstract

The present invention provides a gas concentration detection sensor and a detection method thereof, which relates to the field of sensor technology, and includes a main positioning seal, a shell body, an analysis and measurement cell, a circuit board module and a microporous filter plate, wherein the outer wall at the lower end of the main positioning seal is threadedly sealed with the inner wall at the upper end of the shell body, the analysis and measurement cell is located between the main positioning seal and the shell body, the microporous filter plate is arranged at the lower interior of the shell body, the circuit board module is located inside the main positioning seal at the upper end of the analysis and measurement cell, and a signal cable sealing port is provided at the upper end of the main positioning seal. The present invention can significantly improve the accuracy and stability of measurement through the cooperation of a reference electrode and a sensor signal balancer, wherein the reference electrode provides a stable reference potential, and the signal balancer ensures the accuracy of the measurement signal by eliminating interference and drift.

Description

Technical Field

[0001] The present invention relates to the field of sensor technology, and in particular to a gas concentration detection sensor and a detection method thereof. Background Art

[0002] Gas concentration detection sensors are used to monitor and measure gas concentrations and are widely used in environmental monitoring, industrial safety, air quality control and medical fields. According to different detection principles and application requirements, the types and functions of gas concentration sensors are also different. The types of gas concentration sensors usually include electrochemical gas sensors, infrared gas sensors, catalytic combustion gas sensors, semiconductor gas sensors, optical gas sensors, laser gas sensors, etc.

[0003] Among them, the electrochemical gas sensor uses electrochemical reaction, the gas reacts with the electrodes inside the sensor to generate a current or voltage signal, which is proportional to the gas concentration;

[0004] For example, the gas concentration detection sensor of "CN111896476B" belongs to the field of gas sensors. The gas concentration detection sensor includes an air chamber component, a light source and a lens component, a microphone, an opening and closing component and a circuit board. A microphone is installed on the top of the air chamber component. The air chamber component, the light source and the lens component, the microphone and the opening and closing component are installed on the circuit board. The air chamber component has a concave lens wall with a concave lens structure. The opening and closing component has an air chamber door plate, a spring and an electromagnet. The spring and the electromagnet generate a pulling force to make the air chamber door plate reciprocate, so that the air chamber component generates and cancels a closed air chamber. It can avoid the air flow turbulence generated when the gas of an ordinary gas sensor is pumped in, reduce the noise caused by air flow turbulence, and improve the measurement accuracy; it can form a full light zone in the closed air chamber, improve the utilization rate of light energy, and can increase the active number of air molecules in the closed air chamber, thereby increasing the intensity of the sound signal generated by the photoacoustic effect;

[0005] However, existing traditional electrochemical gas sensors are easily affected by changes in environmental conditions such as temperature and humidity, which leads to unstable measurement results and affects accuracy. At the same time, traditional sensors have slow gas diffusion and flow speeds, long measurement response times, and cannot respond to changes in gas concentration in a timely manner. Summary of the invention

[0006] The purpose of the present invention is to solve the problem in the prior art that the traditional electrochemical gas sensor is easily disturbed by changes in environmental conditions such as temperature and humidity, resulting in unstable measurement results and affecting the accuracy.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a gas concentration detection sensor, comprising a main positioning seal, a shell body, an analysis and measurement cell, a circuit board module and a microporous filter plate, wherein the outer wall at the lower end of the main positioning seal is threadedly sealed with the inner wall at the upper end of the shell body, the analysis and measurement cell is located between the main positioning seal and the shell body, the microporous filter plate is arranged at the lower part of the shell body, the circuit board module is located inside the main positioning seal at the upper end of the analysis and measurement cell, and a signal cable sealing port is provided at the upper end of the main positioning seal;

[0008] A reference cell and a measuring cell are respectively provided inside the analysis and measurement cell; the lower end of the measuring cell is connected to the outside of the shell body through a microporous filter plate; a filtered gas flow cell is provided between the lower end of the measuring cell and the microporous filter plate; a sensor signal balancer is provided on the circuit board module; a sensor signal common end interface is provided on the sensor signal balancer; a reference sensor bracket and a sensor bracket are respectively interference-fitted at the upper ends of the reference cell and the measurement cell; a sensor positive electrode and a sensor negative electrode are provided on the sensor bracket; and a reference sensor positive electrode and a reference sensor negative electrode are provided on the reference sensor bracket.

[0009] As a preferred embodiment, the outer wall of the sensor positive electrode and the outer wall of the sensor negative electrode are respectively provided with a sensor positive electrode insulation layer and a sensor negative electrode insulation layer, the sensor bracket is provided with two holes, the outer walls of the sensor positive electrode insulation layer and the sensor negative electrode insulation layer are respectively assembled and connected with the holes on the sensor bracket, the sensor positive electrode insulation layer is composed of PFA polytetrafluoroethylene, and its specification is φ2, which is connected to the sensor bracket through an interference fit, and is used for the insulation of the sensor positive electrode, the sensor negative electrode insulation layer is composed of PFA polytetrafluoroethylene, and its specification is φ2, which is connected to the sensor bracket through an interference fit, and is used for the insulation of the sensor negative electrode.

[0010] As a preferred embodiment, the outer wall of the positive electrode of the reference sensor and the outer wall of the negative electrode of the reference sensor are respectively provided with a positive electrode insulation layer of the reference sensor and a negative electrode insulation layer of the reference sensor. Two holes are provided on the reference sensor bracket. The outer walls of the positive electrode insulation layer of the reference sensor and the negative electrode insulation layer of the reference sensor are respectively assembled and connected with the holes on the reference sensor bracket. The positive electrode insulation layer of the reference sensor is composed of PFA polytetrafluoroethylene, and its specification is φ2. It is connected to the sensor bracket by an interference fit and is used for the insulation of the positive electrode of the reference sensor. The negative electrode insulation layer of the reference sensor is composed of PFA polytetrafluoroethylene, and its specification is φ2. It is connected to the sensor bracket by an interference fit and is used for the insulation of the negative electrode of the reference sensor.

[0011] As a preferred embodiment, the negative electrode of the sensor is connected to the negative electrode insulating layer of the sensor by an interference fit, which is used for connecting the negative electrode of the sensor. The positive electrode of the sensor is connected to the positive electrode insulating layer of the sensor by an interference fit, which is used for connecting the positive electrode of the sensor. The negative electrode of the sensor is composed of copper, tin, and silicon, and its specification is φ1. The positive electrode of the sensor is composed of copper, tin, and silicon, and its specification is φ1.

[0012] As a preferred embodiment, the negative electrode of the reference sensor is connected to the insulating layer of the negative electrode of the reference sensor by means of an interference fit, which is used for connecting the negative electrode of the reference sensor. The positive electrode of the reference sensor is connected to the insulating layer of the positive electrode of the reference sensor by means of an interference fit, which is used for connecting the positive electrode of the reference sensor. The negative electrode of the reference sensor is composed of copper, tin, and silicon, and its specification is φ1. The positive electrode of the reference sensor is composed of copper, tin, and silicon, and its specification is φ1.

[0013] As a preferred embodiment, the circuit board module is provided with a sensor signal positive interface, a sensor negative electrode conversion interface, and a sensor positive interface. The sensor signal positive interface is connected to the circuit board module by a pressing manner, and is used for connecting the signal cable. The sensor negative electrode conversion interface is provided with two and is connected to the circuit board module by a pressing manner, and is used for the conversion of the sensor negative circuit. The sensor positive interface is connected to the circuit board module by a pressing manner, and is used for the connection of the sensor positive circuit. The sensor signal positive interface is composed of copper and tin, and its specification is φ1. The sensor negative electrode conversion interface is composed of copper and tin, and its specification is φ1. The sensor positive interface is composed of copper and tin, and its specification is φ1.

[0014] As a preferred embodiment, the sensor signal common end interface is connected to the circuit board module by pressing, and is used for connecting the common terminal of the sensor. The sensor signal balancer is connected to the circuit board module by soldering, and is used for signal filtering and balancing. The sensor signal balancer is composed of copper, tin, and silicon, and its specification is 1:1. The sensor signal common end interface is composed of copper and tin, and its specification is φ1.

[0015] As a preferred embodiment, the reference cell is connected to the analysis and measurement cell by an interference fit, and is used for reference compensation of the analysis and measurement results. The measurement cell is connected to the analysis and measurement cell by an interference fit, and is used to measure the concentration of the medium gas. The reference cell is composed of 316SS stainless steel, and its specification is φ8. The measurement cell is composed of 316SS stainless steel, and its specification is φ8.

[0016] As a preferred embodiment, the filtered gas circulation pool is composed of a closed chamber and is connected to a microporous filter plate by a form-locking method for the circulation of medium gas. A gas circulation pool is provided at the center position below the shell body. The gas circulation pool is connected to a main positioning seal by a thread for the transmission and circulation of gas medium. The specification of the filtered gas circulation pool is φ25. The gas circulation pool is composed of 316SS stainless steel, and its specification is φ19.

[0017] The present invention also provides a detection method of a gas concentration detection sensor, comprising the following steps:

[0018] Step S1, providing a stable power supply for the gas concentration detection sensor to ensure that the voltage and current meet the specification requirements;

[0019] Step S2, exposing the gas concentration detection sensor to the gas to be detected, the gas is collected from the gas flow pool, filtered through the microporous filter plate, enters the filtered gas flow pool, and flows into the measurement pool;

[0020] Step S3, the gas undergoes an electrochemical reaction with the sensor electrodes, and the sensor generates an electrical signal proportional to the gas concentration. The electrochemical reaction generates current or voltage changes between the sensor electrodes, and these changes are converted into electrical signals by the sensor circuit;

[0021] Step S4, connecting the signal outputs of the sensor and the reference sensor to the input end of the sensor signal balancer, the sensor signal balancer processes the sensor signal, converts the processed signal into a standardized signal and performs data processing to calculate the gas concentration;

[0022] Compared with the prior art, the advantages and positive effects of the present invention are:

[0023] 1. The present invention can significantly improve the accuracy and stability of measurement through the cooperation of the reference electrode and the sensor signal balancer, wherein the reference electrode provides a stable reference potential, and the signal balancer ensures the accuracy of the measurement signal by eliminating interference and drift.

[0024] 2. The present invention optimizes the gas flow path and the sensor bracket structure design, and a filtered gas flow pool is arranged between the microporous filter plate and the measuring pool, which can increase the volume of gas that can be accommodated in the analysis and measurement pool, accelerate the gas circulation and detection process, and improve the measurement response speed.

[0025] 3. The present invention improves the anti-electromagnetic interference capability and signal stability through a multi-layer insulation structure and a variety of materials (PFA insulation layer, epoxy resin circuit protection), and can still provide reliable data in various industrial environments or harsh conditions. It uses high-strength 316SS stainless steel material to form the outer shell and internal key components, which has the characteristics of corrosion resistance, high temperature resistance and pressure resistance.

[0026] 4. The present invention uses a microporous filter plate to filter the gas medium, ensuring that the sensor only contacts the target gas, reducing the influence of other impurities or particles on the measurement results, and improving the measurement accuracy and durability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A three-dimensional diagram of a gas concentration detection sensor and a detection method thereof provided by the present invention;

[0028] Figure 2 A schematic diagram of a gas concentration detection sensor and a detection method thereof provided by the present invention in a state where the main positioning seal is separated from the housing body;

[0029] Figure 3 A schematic diagram of the internal structure of a gas concentration detection sensor and a detection method thereof provided by the present invention;

[0030] Figure 4 A schematic diagram of the internal structure of an analytical measurement cell of a gas concentration detection sensor and a detection method thereof provided by the present invention.

[0031] Legend:

[0032] 1. Main positioning seal; 2. Shell body; 3. Analysis and measurement cell; 4. Circuit board module; 5. Microporous filter plate; 6. Signal cable seal; 7. Reference cell; 8. Measuring cell; 9. Sensor signal balancer; 10. Sensor signal common terminal interface; 11. Sensor bracket; 12. Reference sensor bracket; 13. Sensor positive electrode; 14. Sensor negative electrode; 15. Sensor positive electrode insulation layer; 16. Sensor negative electrode insulation layer; 17. Sensor signal positive electrode interface; 18. Sensor negative electrode adapter interface; 19. Sensor positive electrode interface; 20. Filtered gas circulation cell; 21. Gas circulation cell; 22. Reference sensor negative electrode; 23. Reference sensor positive electrode; 24. Reference sensor positive electrode insulation layer; 25. Reference sensor negative electrode insulation layer. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-4 The present invention provides a technical solution: a gas concentration detection sensor, comprising a main positioning seal 1, a shell body 2, an analysis and measurement cell 3, a circuit board module 4 and a microporous filter plate 5, wherein the outer wall at the lower end of the main positioning seal 1 is threadedly sealed with the inner wall at the upper end of the shell body 2, the analysis and measurement cell 3 is located between the main positioning seal 1 and the shell body 2, the microporous filter plate 5 is arranged at the lower part of the shell body 2, the circuit board module 4 is located inside the main positioning seal 1 at the upper end of the analysis and measurement cell 3, and a signal cable sealing port 6 is opened at the upper end of the main positioning seal 1;

[0035] A reference cell 7 and a measuring cell 8 are respectively provided inside the analysis and measurement cell 3. The lower end of the measuring cell 8 is connected to the outside of the housing body 2 through a microporous filter plate 5. A filtered gas circulation cell 20 is provided between the lower end of the measuring cell 8 and the microporous filter plate 5. A sensor signal balancer 9 is provided on the circuit board module 4. A sensor signal common end interface 10 is provided on the sensor signal balancer 9. A sensor bracket 11 and a reference sensor bracket 12 are respectively interference-fitted at the upper ends of the reference cell 7 and the measuring cell 8. A sensor positive electrode 13 and a sensor negative electrode 14 are provided on the sensor bracket 11. A reference sensor positive electrode 23 and a reference sensor negative electrode 22 are provided on the reference sensor bracket 12. The sensor bracket 11 is composed of 316SS stainless steel with a specification of φ10 for supporting the sensor. The reference sensor bracket 12 is composed of 316SS stainless steel with a specification of φ10 for supporting the reference sensor. The circuit board module 4 is composed of epoxy resin with a specification of φ25. It is connected to the analysis and measurement cell 3 by a form-position locking method for measuring the sensor. The signal of the measurement value is processed, the main positioning seal 1 is composed of 316SS stainless steel, and its specification is 1:1, which is used for positioning and sealing the entire mechanism. The shell body 2 is located at the outermost of the device and is composed of 316SS stainless steel. Its specification is 1:1. The analysis and measurement pool 3, the circuit board module 4, and the microporous filter plate 5 are fixed inside it for protection, limiting and sealing of the entire mechanism. The analysis and measurement pool 3 is composed of 316SS stainless steel, and its specification is φ30. It is connected to the shell body 2 and the main positioning seal 1 by a step-type positioning method, and is used for accurate instrument measurement of the gas medium and the sensor conduction. The microporous filter plate 5 is composed of sintered 316SS stainless steel, and its specification is φ25. It is connected to the analysis and measurement pool 3 by a shape-position positioning method, and is used for filtering the gas medium. The signal cable sealing port 6 is located in the main positioning seal 1, and is composed of 316SS stainless steel. Its specification is φ14. It is connected to the shell body 2 by a thread, and is used for positioning and sealing the entire mechanism.

[0036] like Figure 1-4 As shown, the outer wall of the sensor positive electrode 13 and the outer wall of the sensor negative electrode 14 are respectively provided with a sensor positive electrode insulating layer 15 and a sensor negative electrode insulating layer 16. Two holes are provided on the sensor bracket 11. The outer walls of the sensor positive electrode insulating layer 15 and the sensor negative electrode insulating layer 16 are respectively assembled and connected with the holes on the sensor bracket 11. The sensor positive electrode insulating layer 15 is composed of PFA polytetrafluoroethylene, and its specification is φ2. It is connected to the sensor bracket 11 through an interference fit and is used for insulating the sensor positive electrode 13. The sensor negative electrode insulating layer 16 is composed of PFA polytetrafluoroethylene, and its specification is φ2. It is connected to the sensor bracket 11 through an interference fit and is used for insulating the sensor negative electrode 14.

[0037] like Figure 1-4As shown, the outer wall of the reference sensor positive electrode 23 and the outer wall of the reference sensor negative electrode 22 are respectively provided with a reference sensor positive electrode insulating layer 24 and a reference sensor negative electrode insulating layer 16. Two holes are provided on the reference sensor bracket 12. The outer walls of the reference sensor positive electrode insulating layer 24 and the reference sensor negative electrode insulating layer 16 are respectively assembled and connected with the holes on the reference sensor bracket 12. The reference sensor positive electrode insulating layer 24 is composed of PFA polytetrafluoroethylene, and its specification is φ2. It is connected to the sensor bracket 11 through an interference fit and is used for insulating the reference sensor positive electrode 23. The reference sensor negative electrode insulating layer 16 is composed of PFA polytetrafluoroethylene, and its specification is φ2. It is connected to the sensor bracket 11 through an interference fit and is used for insulating the reference sensor negative electrode 22.

[0038] like Figure 1-4 As shown, the sensor negative electrode 14 is connected to the sensor negative electrode insulating layer 16 by interference fit, which is used for connecting the sensor negative electrode. The sensor positive electrode 13 is connected to the sensor positive electrode insulating layer 15 by interference fit, which is used for connecting the sensor positive electrode. The sensor negative electrode 14 is composed of copper, tin, and silicon, and its specification is φ1. The sensor positive electrode 13 is composed of copper, tin, and silicon, and its specification is φ1.

[0039] like Figure 1-4 As shown, the negative electrode 22 of the reference sensor is connected to the negative electrode insulating layer 16 of the reference sensor by means of interference fit, which is used for the connection of the negative electrode 22 of the reference sensor. The positive electrode 23 of the reference sensor is connected to the positive electrode insulating layer 24 of the reference sensor by means of interference fit, which is used for the connection of the positive electrode 23 of the reference sensor. The negative electrode 22 of the reference sensor is composed of copper, tin, and silicon, and its specification is φ1. The positive electrode 23 of the reference sensor is composed of copper, tin, and silicon, and its specification is φ1.

[0040] like Figure 1-4 As shown, the circuit board module 4 is provided with a sensor signal positive electrode interface 17, a sensor negative electrode conversion interface 18, and a sensor positive electrode interface 19. The sensor signal positive electrode interface 17 is connected to the circuit board module 4 by a pressing method and is used for connecting the signal cable. Two sensor negative electrode conversion interfaces 18 are provided and are connected to the circuit board module 4 by a pressing method and are used for switching the sensor negative electrode circuit. The sensor positive electrode interface 19 is connected to the circuit board module 4 by a pressing method and is used for connecting the sensor positive electrode circuit. The sensor signal positive electrode interface 17 is composed of copper and tin, and its specification is φ1. The sensor negative electrode conversion interface 18 is composed of copper and tin, and its specification is φ1. The sensor positive electrode interface 19 is composed of copper and tin, and its specification is φ1.

[0041] like Figure 1-4As shown, the sensor signal common end interface 10 is connected to the circuit board module 4 by pressing, and is used for connecting the common terminal of the sensor. The sensor signal balancer 9 is connected to the circuit board module 4 by soldering, and is used for signal filtering and balancing. The sensor signal balancer 9 is composed of copper, tin, and silicon, and its specification is 1:1. The sensor signal common end interface 10 is composed of copper and tin, and its specification is φ1.

[0042] like Figure 1-4 As shown, the reference cell 7 is connected to the analysis and measurement cell 3 by means of interference fit, and is used for reference compensation of the analysis and measurement results. The measurement cell 8 is connected to the analysis and measurement cell 3 by means of interference fit, and is used for measuring the medium gas concentration. The reference cell 7 is composed of 316SS stainless steel, and its specification is φ8. The measurement cell 8 is composed of 316SS stainless steel, and its specification is φ8.

[0043] like Figure 1-4 As shown, the filtered gas circulation pool 20 is composed of a closed chamber and is connected to the microporous filter plate 5 by a shape-position locking method, which is used for the circulation of medium gas. A gas circulation pool 21 is provided at the center position below the shell body 2. The gas circulation pool 21 is connected to the main positioning seal 1 through a thread, which is used for the transmission and circulation of gas medium. The specification of the filtered gas circulation pool 20 is φ25, and the gas circulation pool 21 is composed of 316SS stainless steel, and its specification is φ19.

[0044] It is worth mentioning that φ is the outer diameter size, and the unit is mm. For example, if the specification of the sensor signal common terminal interface 10 is φ1, it means that the outer diameter size of the sensor signal common terminal interface 10 is 1 mm.

[0045] Working principle:

[0046] Step S1, providing a stable power supply for the gas concentration detection sensor to ensure that the voltage and current meet the specification requirements;

[0047] Step S2, exposing the gas concentration detection sensor to the gas to be detected, the gas is collected from the gas flow pool 21, filtered through the microporous filter plate 5, enters the filtered gas flow pool 20, and flows into the measurement pool 8;

[0048] Step S3, the gas undergoes an electrochemical reaction with the sensor electrodes, and the sensor generates an electrical signal proportional to the gas concentration. The electrochemical reaction generates current or voltage changes between the sensor electrodes, and these changes are converted into electrical signals by the sensor circuit;

[0049] Step S4, connecting the signal outputs of the sensor and the reference sensor to the input end of the sensor signal balancer 9, the sensor signal balancer 9 will process the sensor signal, convert the processed signal into a standardized signal and perform data processing to calculate the gas concentration.

[0050] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A gas concentration detection sensor, characterized in that: The invention comprises a main positioning seal (1), a shell body (2), an analysis and measurement cell (3), a circuit board module (4) and a microporous filter plate (5), wherein the outer wall of the lower end of the main positioning seal (1) is threadedly sealed with the inner wall of the upper end of the shell body (2), the analysis and measurement cell (3) is located between the main positioning seal (1) and the shell body (2), the microporous filter plate (5) is arranged at the lower part of the shell body (2), the circuit board module (4) is located inside the main positioning seal (1) at the upper end of the analysis and measurement cell (3), and a signal cable sealing opening (6) is provided at the upper end of the main positioning seal (1); The analysis and measurement cell (3) is provided with a reference cell (7) and a measurement cell (8) respectively. The lower end of the measurement cell (8) is connected to the outside of the housing body (2) through a microporous filter plate (5). A filtered gas flow cell (20) is provided between the lower end of the measurement cell (8) and the microporous filter plate (5). The circuit board module (4) is provided with a sensor signal balancer (9). The sensor signal balancer (9) is provided with a sensor signal common end interface (10). The upper ends of the reference cell (7) and the measurement cell (8) are respectively interference-fitted with a reference sensor bracket (12) and a sensor bracket (11). The sensor bracket (11) is provided with a sensor positive electrode (13) and a sensor negative electrode (14). The reference sensor bracket (12) is provided with a reference sensor positive electrode (23) and a reference sensor negative electrode (22). The sensing signal common end interface (10) is connected to the circuit board module (4) by means of compression, and is used for connecting the common terminal of the sensor; the sensing signal balancer (9) is connected to the circuit board module (4) by means of soldering, and is used for signal filtering and balancing; the reference cell (7) is connected to the analysis and measurement cell (3) by means of interference fit, and is used for reference compensation of analysis and measurement results; the measurement cell (8) is connected to the analysis and measurement cell (3) by means of interference fit, and is used for measuring the concentration of medium gas.

2. The gas concentration detection sensor according to claim 1, characterized in that: The outer wall of the sensor positive electrode (13) and the outer wall of the sensor negative electrode (14) are respectively covered with a sensor positive electrode insulation layer (15) and a sensor negative electrode insulation layer (16); the sensor bracket (11) is provided with two holes; the outer walls of the sensor positive electrode insulation layer (15) and the sensor negative electrode insulation layer (16) are respectively assembled and connected with the holes on the sensor bracket (11).

3. The gas concentration detection sensor according to claim 1, characterized in that: The outer wall of the reference sensor positive electrode (23) and the outer wall of the reference sensor negative electrode (22) are respectively covered with a reference sensor positive electrode insulation layer (24) and a reference sensor negative electrode insulation layer (25); the reference sensor bracket (12) is provided with two holes; the outer walls of the reference sensor positive electrode insulation layer (24) and the reference sensor negative electrode insulation layer (25) are respectively assembled and connected with the holes on the reference sensor bracket (12).

4. The gas concentration detection sensor according to claim 2, characterized in that: The sensor negative electrode (14) is connected to the sensor negative electrode insulating layer (16) by means of interference fit, and is used for connecting the sensor negative electrode. The sensor positive electrode (13) is connected to the sensor positive electrode insulating layer (15) by means of interference fit, and is used for connecting the sensor positive electrode (13).

5. The gas concentration detection sensor according to claim 3, characterized in that: The reference sensor negative electrode (22) is connected to the reference sensor negative electrode insulating layer (25) by means of interference fit, and is used for connecting the reference sensor negative electrode (22); the reference sensor positive electrode (23) is connected to the reference sensor positive electrode insulating layer (24) by means of interference fit, and is used for connecting the reference sensor positive electrode (23).

6. The gas concentration detection sensor according to claim 1, characterized in that: The circuit board module (4) is provided with a sensor signal positive electrode interface (17), a sensor negative electrode switching interface (18), and a sensor positive electrode interface (19); the sensor signal positive electrode interface (17) is connected to the circuit board module (4) by a pressing method and is used for connecting a signal cable; two sensor negative electrode switching interfaces (18) are provided and are connected to the circuit board module (4) by a pressing method and are used for switching the sensor negative electrode (14) circuit; the sensor positive electrode interface (19) is connected to the circuit board module (4) by a pressing method and is used for connecting the sensor positive electrode (13) circuit.

7. The gas concentration detection sensor according to claim 1, characterized in that: The filtered gas circulation pool (20) is composed of a closed chamber and is connected to the microporous filter plate (5) by a form-locking method, and is used for the circulation of medium gas. A gas circulation pool (21) is provided at the center position below the shell body (2). The gas circulation pool (21) is connected to the main positioning seal (1) by a thread, and is used for the transmission and circulation of gas medium.

8. A detection method for a gas concentration detection sensor, characterized in that: The gas concentration detection sensor according to claim 7 is used, comprising the following steps: Step S1, providing a stable power supply for the gas concentration detection sensor to ensure that the voltage and current meet the specification requirements; Step S2, exposing the gas concentration detection sensor to the gas to be detected, the gas is collected from the gas flow pool (21), filtered through the microporous filter plate (5), enters the filtered gas flow pool (20), and flows into the measurement pool (8); Step S3, the gas undergoes an electrochemical reaction with the sensor electrodes, and the sensor generates an electrical signal proportional to the gas concentration. The electrochemical reaction generates current or voltage changes between the sensor electrodes, and these changes are converted into electrical signals by the sensor circuit; Step S4, connecting the signal outputs of the sensor and the reference sensor to the input end of the sensor signal balancer (9), the sensor signal balancer (9) will process the sensor signal, convert the processed signal into a standardized signal and perform data processing to calculate the gas concentration.

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