Fixed gas detection digital sensor system

Abstract

The utility model discloses a fixed gas detection digital sensor system which comprises a probe main board, a first sensor board and a second sensor, wherein the first sensor board and the second sensor are electrically connected with corresponding ends of the probe main board; the probe mainboard comprises an LDO power supply unit, a control unit, a storage unit and a temperature compensation unit; the corresponding end of the control unit is electrically connected with the corresponding ends of the LDO power supply unit, the storage unit and the temperature compensation unit. The first sensor plate comprises a reference voltage unit, a first ADC acquisition unit, a first operational amplification unit and an electrochemical sensor; the second sensor board comprises a second LDO power supply unit, a second ADC acquisition unit, a second operational amplification unit and a gas sensor. The modularized design of the sensor board and the probe mainboard allows the sensor to be replaced and upgraded quickly so as to adapt to different detection requirements, and the flexibility and expansibility of the system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detection, in particular to a fixed gas detection digital sensor system. Background Art

[0002] A gas detector is an instrument tool for detecting gas leakage concentration. It can be divided into fixed gas detectors and handheld gas detectors according to the method of use. It can be divided into single gas detectors and multi-gas detectors according to the number of detectable gases. It can be divided into infrared gas detectors, thermal magnetic gas detectors, electrochemical gas detectors, semiconductor gas detectors, ultraviolet gas detectors, etc. according to the principle of the gas sensor.

[0003] During normal use, gas detectors need to be calibrated regularly with standard concentration gases, and sensors need to be maintained and replaced after their lifespan. Portable detectors can conveniently complete these operations in the test area, but fixed gas detectors are troublesome to perform calibration and maintenance operations when the site is in a hazardous area due to the particularity of the installation environment. In the commonly used fixed gas detectors on the market, the sensor's signal amplification circuit and ADC acquisition are integrated with the circuit board of the entire machine, and the calibrated sensitivity parameters are also stored in the host's memory chip. Later calibration work and maintenance replacement need to be carried out in conjunction with the entire machine, which is not convenient for on-site calibration and maintenance replacement. A lot of time needs to be spent on disassembly and installation of the instrument. Moreover, during maintenance, the lack of detection equipment will also cause blind spots in the detection of flammable, explosive, toxic and harmful gases on site, posing a safety hazard to people's lives and property. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model provides a fixed gas detection digital sensor system.

[0005] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0006] The utility model provides a fixed gas detection digital sensor system, comprising: a probe mainboard, a sensor board 1 and a sensor 2 electrically connected to corresponding ends of the probe mainboard;

[0007] The probe mainboard includes an LDO power supply unit, a control unit, a storage unit, and a temperature compensation unit; the corresponding ends of the control unit are electrically connected to the corresponding ends of the LDO power supply unit, the storage unit, and the temperature compensation unit respectively;

[0008] The sensor board 1 includes a reference voltage unit, an ADC acquisition unit 1, an operational amplifier unit 1, and an electrochemical sensor; the corresponding end of the reference voltage unit is electrically connected to the ADC acquisition unit 1, the operational amplifier unit 1, and the electrochemical sensor in sequence;

[0009] The second sensor board includes a second LDO power supply unit, a second ADC acquisition unit, a second operational amplifier unit, and a gas sensor; the corresponding end of the second LDO power supply unit is electrically connected to the corresponding end of the gas sensor, and the corresponding end of the second ADC acquisition unit is electrically connected to the corresponding end of the gas sensor via the second operational amplifier unit.

[0010] Preferably, the probe mainboard further includes a probe mainboard interface, a sensor board data interface 1, a sensor board power interface 2, and a current limiting resistor R1; the corresponding ends of the LDO power supply unit are electrically connected to the first end of the current limiting resistor R1 and the corresponding end of the sensor board power interface 2, respectively, and the second end of the current limiting resistor R1 is electrically connected to the corresponding ends of the probe mainboard interface and the sensor board power interface 2, respectively; the corresponding end of the control unit is also electrically connected to the corresponding end of the sensor board data interface 1.

[0011] Preferably, the control unit includes a microprocessor chip MCU, and the model of the MCU chip is GD32F310F8P6;

[0012] The LDO power supply unit includes an LDO power supply chip U1, and a corresponding end of the LDO power supply chip U1 is electrically connected to a corresponding end of a microprocessor chip MCU; the model of the LDO power supply chip U1 is S-1112B33.

[0013] Preferably, the storage unit includes a storage chip U3, and the corresponding end of the storage chip U3 is electrically connected to the corresponding end of the microprocessor chip MCU; the model of the storage chip U3 is BL24C08;

[0014] The temperature compensation unit includes an NTC thermistor, and a corresponding end of the NTC thermistor is electrically connected to a corresponding end of the microprocessor chip MCU.

[0015] Preferably, the sensor board 1 further includes a sensor board data interface 3 and a sensor board power interface 4;

[0016] The sensor board 2 also includes a sensor board data interface 5 and a sensor board power interface 6;

[0017] The corresponding end of the sensor board data interface 3 is electrically connected to the corresponding end of the sensor board data interface 1, the sensor board data interface 5, and the ADC acquisition unit 1 respectively;

[0018] The corresponding end of the sensor board power interface 4 is electrically connected to the corresponding ends of the sensor board power interface 2, the sensor board power interface 6, and the reference voltage unit respectively.

[0019] Preferably, the second sensor board further includes a current limiting resistor R2, an isolation resistor R3, an isolation resistor R4, an isolation resistor R5, and an isolation resistor R6; the sixth sensor board power interface is electrically connected to the second LDO power supply unit via the current limiting resistor R2; the corresponding ends of the sixth sensor board power interface are also electrically connected to the corresponding ends of the second ADC acquisition unit and the second operational amplifier unit respectively; the corresponding ends of the second ADC acquisition unit are electrically connected to the corresponding ends of the gas sensor via the isolation resistor R3 and the isolation resistor R4 respectively;

[0020] The corresponding end of the sensor board data interface five is also electrically connected to the corresponding end of the ADC acquisition unit two; the corresponding end of the sensor board data interface five is also electrically connected to the corresponding end of the gas sensor through the isolation resistor R5 and the isolation resistor R6 respectively.

[0021] Preferably, the operational amplifier unit 1 includes an operational amplifier chip U4, and the model of the operational amplifier chip U4 is AD8607;

[0022] The ADC acquisition unit 1 includes an ADC acquisition chip U5, and the model of the ADC acquisition chip U5 is ADS1100.

[0023] Preferably, the reference voltage unit includes a reference voltage chip U6 , the model of which is REF3302, and is used to provide a stable reference voltage of 1.25V for the operational amplifier chip U4 and the ADC acquisition chip U5 .

[0024] Preferably, the second operational amplifier unit includes an operational amplifier chip U7, and the model of the operational amplifier chip U7 is AD8607;

[0025] The ADC acquisition unit 2 includes an ADC acquisition chip U8, the model of which is ADS1100;

[0026] The LDO power supply unit 2 includes an LDO power supply chip U9, the model of which is S-1172B33, and is used to provide a stable 3.3V power supply for the gas sensor.

[0027] Preferably, the gas sensor includes an IR sensor, an EX sensor, or a PID sensor.

[0028] The technical solution of the present invention has the following beneficial effects:

[0029] Modular design: The modular design of the sensor board and probe main board allows for quick replacement and upgrade of sensors to adapt to different detection needs, improving the flexibility and scalability of the system.

[0030] Fast calibration and maintenance: A standard 5-pin connector allows for quick installation and removal of the sensor in hazardous areas, ensuring continuous monitoring of the environment. The digital sensor is independently calibrated using the host computer software, and calibration parameters are stored in an internal independent memory chip, eliminating the need for host computer testing and calibration, simplifying on-site operation.

[0031] Multi-gas detection capability: One probe motherboard can be adapted to multiple sensor circuits, such as the electrochemical three-electrode gas sensor board, which can detect CO, H2S, SO2, H2, O2, NO, NO2, NH3 and other electrochemical sensors. It can also be adapted to sensor boards with different detection principles such as IR / PID / EX, and can detect CH4, VOC, CO2 and other diversified gases, covering a wide range of detection gases.

[0032] High precision and stability: The use of current limiting resistors and isolation resistors improves the safety and anti-interference ability of the circuit, ensures the stability and accuracy of the sensor output signal, and thus ensures the high precision and reliability of gas detection.

[0033] Low power design: The use of low-power LDO power supply unit and microprocessor MCU reduces the energy consumption of the entire system and is suitable for long-term continuous operation.

[0034] Intrinsically safe and explosion-proof: The digital sensor complies with the IECex IIC Ia T6 Ga international certification standard and is suitable for use in Zone 0, Zone 1, and Zone 2 locations in factories with explosive gas mixtures of levels IIA, IIB, and IIC, and temperature groups T1-T6, ensuring safety in hazardous environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is the control block diagram of the utility model. DETAILED DESCRIPTION

[0036] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0039] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0041] Reference Figure 1 The utility model provides a fixed gas detection digital sensor system, comprising: a probe main board 100, a sensor board 1 200 and a sensor 2 300 electrically connected to corresponding ends of the probe main board 100;

[0042] The probe mainboard includes an LDO power supply unit 102, a control unit 101, a storage unit 103, and a temperature compensation unit 104; the corresponding end of the control unit 102 is electrically connected to the corresponding end of the LDO power supply unit 102, the storage unit 103, and the temperature compensation unit 104 respectively;

[0043] The sensor board 1 200 includes a reference voltage unit 201, an ADC acquisition unit 1 202, an operational amplifier unit 1 203, and an electrochemical sensor 204; corresponding ends of the reference voltage unit 201 are electrically connected to the ADC acquisition unit 1 202, the operational amplifier unit 1 203, and the electrochemical sensor 204 in sequence;

[0044] The electrochemical sensor 204 can detect gases such as CO, H2S, SO2, H2, O2, NO, NO2, NH3, etc., wherein the electrochemical sensor is used to convert toxic and harmful gases leaked into the air into current signals through internal redox reactions, and the magnitude of this current value is proportional to the gas concentration.

[0045] The second sensor board 300 includes a second LDO power supply unit 301, a second ADC acquisition unit 302, a second operational amplifier unit 303, and a gas sensor 304. The corresponding end of the second LDO power supply unit 301 is electrically connected to the corresponding end of the gas sensor 304, and the corresponding end of the second ADC acquisition unit 302 is electrically connected to the corresponding end of the gas sensor 304 via the second operational amplifier unit 303.

[0046] The gas sensor 304 includes an IR sensor, an EX sensor, and a PID sensor, and is compatible with IR infrared principle, PID ionization principle, and EX catalytic principle sensors to achieve measurement of multiple gases. It can detect CH4, VOC, CO2 and other diversified gases, and has a wide range of gas detection coverage.

[0047] Furthermore, the probe mainboard also includes a probe mainboard interface 105, a sensor board data interface 106, a sensor board power interface 2 107, and a current-limiting resistor R1. The corresponding ends of the LDO power supply unit 102 are electrically connected to the first end of the current-limiting resistor R1 and the corresponding end of the sensor board power interface 2 107, respectively. The second end of the current-limiting resistor R1 is electrically connected to the corresponding ends of the probe mainboard interface 105 and the sensor board power interface 2 107, respectively. The corresponding end of the control unit 101 is also electrically connected to the corresponding end of the sensor board data interface 1 106. In this embodiment, the probe mainboard interface 105 is a standard 5P pin input interface, including serial communication and power input, and communicates with the fixed gas detector host. The probe mainboard interface 105 exchanges data with the fixed gas detector host via serial communication. This communication method allows the host to receive data from the sensor in real time, such as gas concentration measurement values ​​and sensor status information, thereby enabling monitoring and analysis of ambient gas concentration. The mainboard interface 105 is also responsible for providing the necessary power for the probe mainboard and the sensor board connected to it. Through the electrical connection with the LDO power supply unit 102, it ensures stable power supply for the entire circuit. The setting of the current-limiting resistor R1 plays a protective role in the circuit. It limits the current passing through the power interface 107 to prevent damage to sensitive components in the circuit, such as sensors and microprocessors MCU, due to excessive current. The electrical connection between the sensor board data interface 106 and the control unit 101 enables the control unit to receive data collected by the sensors, perform corresponding processing, and send the processed data to the host through the mainboard interface 105.

[0048] Furthermore, the control unit 101 includes a microprocessor chip MCU, the model of which is GD32F310F8P6; the control unit 101 is a 32-bit microprocessor chip MCU of a digital sensor, which realizes low-power temperature acquisition, ADC communication, data storage, serial port communication, etc.

[0049] The LDO power supply unit 102 includes an LDO power supply chip U1, and the corresponding end of the LDO power supply chip U1 is electrically connected to the corresponding end of the microprocessor chip MCU; the model of the LDO power supply chip U1 is S-1112B33, which provides a stable low-voltage DC power supply to the probe mainboard to ensure the normal operation of other components in the circuit.

[0050] The storage unit 103 includes a memory chip U3, the corresponding end of which is electrically connected to the corresponding end of the microprocessor chip MCU; the memory chip U3 is a BL24C08 chip that stores factory-set parameters and gas calibration values ​​for quick access and use when needed;

[0051] The temperature compensation unit 104 includes an NTC thermistor, which collects the ambient temperature of the sensor through the MCU to achieve compensation values ​​for changes in sensor sensitivity at different temperatures. The corresponding end of the NTC thermistor is electrically connected to the corresponding end of the microprocessor chip MCU.

[0052] Furthermore, the sensor board 1 200 also includes a sensor board data interface 3 205 and a sensor board power interface 4 206; the sensor board 2 300 also includes a sensor board data interface 5 305 and a sensor board power interface 6 306; the corresponding ends of the sensor board data interface 3 205 are respectively electrically connected to the corresponding ends of the sensor board data interface 1 106, the sensor board data interface 5 305, and the ADC acquisition unit 1 202; the corresponding ends of the sensor board power interface 4 206 are respectively electrically connected to the corresponding ends of the sensor board power interface 2 107, the sensor board power interface 6 306, and the reference voltage unit 201; in this embodiment, the sensor board data interface 1 106 and the sensor board power interface 2 107 are 5P pin headers, and the sensor board data interface 3 205, the sensor board power interface 4 206, the sensor board data interface 5 305, and the sensor board power interface 6 306 are 5P female headers, thereby realizing fast and reliable connection between the probe main board 100 and different sensor boards (sensor board 1 200 and sensor board 2 300).

[0053] Furthermore, the sensor board 2 300 also includes a current-limiting resistor R2, an isolation resistor R3, an isolation resistor R4, an isolation resistor R5, and an isolation resistor R6; the sensor board power interface 6 306 is electrically connected to the LDO power supply unit 2 301 via the current-limiting resistor R2; the corresponding end of the sensor board power interface 6 306 is also electrically connected to the corresponding end of the ADC acquisition unit 2 302 and the corresponding end of the operational amplifier unit 2 303; the corresponding end of the ADC acquisition unit 2 302 is electrically connected to the corresponding end of the gas sensor 304 via the isolation resistor R3 and the isolation resistor R4; the corresponding end of the sensor board data interface 5 305 is also electrically connected to the corresponding end of the ADC acquisition unit 2 302; the corresponding end of the sensor board data interface 5 305 is also electrically connected to the corresponding end of the gas sensor 304 via the isolation resistor R5 and the isolation resistor R6. In this embodiment, current-limiting resistor R2 is used to limit the current flowing through sensor board power interface 6 306 , protecting subsequent circuit components, such as ADC acquisition unit 2 302 , operational amplifier unit 2 303 , and gas sensor 304 , from damage caused by excessive current. Isolation resistors (R3-R6) are used to provide electrical isolation within the circuit, reducing mutual interference between different circuit components and ensuring signal purity and accuracy. This is crucial for improving the measurement accuracy and stability of gas sensor 304 . Sensor board power interface 6 306 serves as a power distribution point, distributing the stable power provided by LDO power unit 2 301 to ADC acquisition unit 2 302 , operational amplifier unit 2 303 , and gas sensor 304 , ensuring their proper operation. Operational amplifier unit 2 303 is used to amplify the output signal of gas sensor 304 to improve the signal strength and quality, making it more suitable for the input requirements of ADC acquisition unit 2 302. ADC acquisition unit 2 302 is responsible for converting the analog signal generated by gas sensor 304 into a digital signal so that the control unit can perform further processing and analysis. Gas sensor 304 is responsible for detecting the presence and concentration of specific gases and converting this information into electrical signals. The use of isolation resistors ensures the stability and accuracy of the sensor output signal.

[0054] Furthermore, the operational amplifier unit 1 203 includes an operational amplifier chip U4, model AD8607. This low-power precision operational amplifier and surrounding resistors and capacitors form a constant potential circuit and an IV transimpedance amplifier circuit. The constant potential circuit maintains the equal potential between the working electrode and reference electrode of the SE1 electrochemical sensor 204. The IV transimpedance amplifier circuit converts the sensor's current signal into a voltage proportional to the gas concentration. The ADC acquisition unit 1 202 includes an ADC acquisition chip U5, model ADS1100. The ADS1100 is a 16-bit, high-resolution, precision ADC that accurately converts the voltage signal amplified by the operational amplifier chip U4 AD8607 into a digital signal. The reference voltage unit 201 includes a reference voltage chip U6, model REF3302, which provides a stable reference voltage of 1.25V for the operational amplifier chip U4 and the ADC acquisition chip U5.

[0055] Furthermore, the operational amplifier unit 2 303 includes an operational amplifier chip U7, and the model of the operational amplifier chip U7 is AD8607;

[0056] The ADC acquisition unit 2 302 includes an ADC acquisition chip U8, the model of which is ADS1100. The ADC acquisition chip U8 ADS1100 is a 16-bit high-resolution precision ADC, which accurately converts the voltage signal amplified by the operational amplifier chip U7 AD8607 into a digital signal.

[0057] The LDO power supply unit 2 301 includes an LDO power supply chip U9, the model of which is S-1172B33, and is used to provide a stable 3.3V power supply for the gas sensor.

[0058] The working principle of the fixed gas detector intrinsically safe explosion-proof digital sensor of the present invention is based on modular design. By using the probe main board in conjunction with different types of sensor boards, it can achieve detection and data transmission of multiple gases. The following is a detailed description of the working principle:

[0059] The probe mainboard provides a stable low-voltage DC power supply for the entire system through an LDO power supply unit (such as S-1112B33). The power is distributed to various components such as the probe mainboard interface 105, the control unit 101, the storage unit 103, and the temperature compensation unit 104 through a current-limiting resistor (such as R1), ensuring stable operation of the circuit and providing overcurrent protection.

[0060] Signal acquisition: The gas sensor (such as an electrochemical sensor, an IR sensor, a PID sensor, or an EX sensor) on the sensor board (such as sensor board one 200 or sensor board two 300) first detects the gas composition and concentration in the environment and converts this information into an electrical signal.

[0061] Signal processing: The electrical signal output by the sensor is amplified by an operational amplifier (such as the AD8607) to improve signal strength and quality. The amplified signal is then transmitted to an ADC (such as the ADS1100) for further conversion from analog to digital.

[0062] Data transmission and control: Digital signals are transmitted via the sensor board data interface to the control unit (e.g., GD32F310F8P6 microprocessor MCU) on the probe mainboard 100. The control unit is responsible for processing the data, including preliminary data analysis, storage in an internal storage unit (e.g., BL24C08 memory chip), and transmission of the data to the fixed gas detector host via the probe mainboard interface (e.g., a standard 5P pin input interface).

[0063] Temperature compensation: The NTC thermistor on the probe motherboard detects ambient temperature and provides this information to the control unit. The control unit 101 compensates the sensor's output signal based on this temperature information to eliminate the effects of temperature changes on gas detection results.

[0064] Communication and Calibration: The probe's mainboard interface 105 supports serial communication with a fixed gas detector host, allowing the host to remotely calibrate and configure the sensor. Calibration parameters are stored in an internal memory unit, ensuring the sensor's accuracy and reliability under varying temperatures and operating conditions.

[0065] Through the above working principle, the fixed gas detector of the present invention can accurately detect and measure the gas concentration in the environment, and transmit the data to the control system or display device, thereby realizing real-time monitoring of gas safety in industrial production and environmental monitoring.

[0066] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A fixed gas detection digital sensor system, characterized in that: include: A probe main board, a sensor board 1 and a sensor 2 electrically connected to corresponding ends of the probe main board; The probe mainboard includes an LDO power supply unit, a control unit, a storage unit, and a temperature compensation unit; the corresponding ends of the control unit are electrically connected to the corresponding ends of the LDO power supply unit, the storage unit, and the temperature compensation unit respectively; The sensor board 1 includes a reference voltage unit, an ADC acquisition unit 1, an operational amplifier unit 1, and an electrochemical sensor; the corresponding end of the reference voltage unit is electrically connected to the ADC acquisition unit 1, the operational amplifier unit 1, and the electrochemical sensor in sequence; The second sensor board includes a second LDO power supply unit, a second ADC acquisition unit, a second operational amplifier unit, and a gas sensor; the corresponding end of the second LDO power supply unit is electrically connected to the corresponding end of the gas sensor, and the corresponding end of the second ADC acquisition unit is electrically connected to the corresponding end of the gas sensor via the second operational amplifier unit.

2. The fixed gas detection digital sensor system according to claim 1, characterized in that: The probe mainboard also includes a probe mainboard interface, a sensor board data interface 1, a sensor board power interface 2, and a current limiting resistor R1; the corresponding ends of the LDO power supply unit are electrically connected to the first end of the current limiting resistor R1 and the corresponding end of the sensor board power interface 2, respectively, and the second end of the current limiting resistor R1 is electrically connected to the corresponding ends of the probe mainboard interface and the sensor board power interface 2, respectively; the corresponding end of the control unit is also electrically connected to the corresponding end of the sensor board data interface 1.

3. The fixed gas detection digital sensor system according to claim 2, characterized in that: The control unit includes a microprocessor chip MCU, the model of the MCU chip is GD32F310F8P6; The LDO power supply unit includes an LDO power supply chip U1, and a corresponding end of the LDO power supply chip U1 is electrically connected to a corresponding end of a microprocessor chip MCU; the model of the LDO power supply chip U1 is S-1112B33.

4. The fixed gas detection digital sensor system according to claim 3, characterized in that: The storage unit includes a storage chip U3, the corresponding end of the storage chip U3 is electrically connected to the corresponding end of the microprocessor chip MCU; the model of the storage chip U3 is BL24C08; The temperature compensation unit includes an NTC thermistor, and a corresponding end of the NTC thermistor is electrically connected to a corresponding end of the microprocessor chip MCU.

5. The fixed gas detection digital sensor system according to claim 1, characterized in that: The sensor board 1 also includes a sensor board data interface 3 and a sensor board power interface 4; The sensor board 2 also includes a sensor board data interface 5 and a sensor board power interface 6; The corresponding end of the sensor board data interface 3 is electrically connected to the corresponding end of the sensor board data interface 1, the sensor board data interface 5, and the ADC acquisition unit 1 respectively; The corresponding end of the sensor board power interface 4 is electrically connected to the corresponding ends of the sensor board power interface 2, the sensor board power interface 6, and the reference voltage unit respectively.

6. The fixed gas detection digital sensor system according to claim 5, characterized in that: The second sensor board also includes a current limiting resistor R2, an isolation resistor R3, an isolation resistor R4, an isolation resistor R5, and an isolation resistor R6; the sixth sensor board power interface is electrically connected to the second LDO power supply unit via the current limiting resistor R2; the corresponding end of the sixth sensor board power interface is also electrically connected to the corresponding end of the second ADC acquisition unit and the corresponding end of the second operational amplifier unit; the corresponding end of the second ADC acquisition unit is electrically connected to the corresponding end of the gas sensor via the isolation resistor R3 and the isolation resistor R4; The corresponding end of the sensor board data interface five is also electrically connected to the corresponding end of the ADC acquisition unit two; the corresponding end of the sensor board data interface five is also electrically connected to the corresponding end of the gas sensor through the isolation resistor R5 and the isolation resistor R6 respectively.

7. The fixed gas detection digital sensor system according to claim 5, characterized in that: The operational amplifier unit 1 includes an operational amplifier chip U4, the model of which is AD8607; The ADC acquisition unit 1 includes an ADC acquisition chip U5, and the model of the ADC acquisition chip U5 is ADS1100.

8. The fixed gas detection digital sensor system according to claim 7, characterized in that: The reference voltage unit includes a reference voltage chip U6 , the model of which is REF3302, and is used to provide a stable reference voltage of 1.25V for the operational amplifier chip U4 and the ADC acquisition chip U5 .

9. The fixed gas detection digital sensor system according to claim 6, characterized in that: The operational amplifier unit 2 includes an operational amplifier chip U7, the model of which is AD8607; The ADC acquisition unit 2 includes an ADC acquisition chip U8, the model of which is ADS1100; The LDO power supply unit 2 includes an LDO power supply chip U9, the model of which is S-1172B33, and is used to provide a stable 3.3V power supply for the gas sensor.

10. The fixed gas detection digital sensor system according to claim 9, characterized in that: The gas sensors include IR sensors, EX sensors, and PID sensors.

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