Multi-sensor access concentration and temperature measurement system and calibration method thereof

Abstract

The invention discloses a multi-sensor access concentration and temperature measurement system and a calibration method thereof. The system comprises small split type sensors, customized data lines, a circuit board module, a data acquisition instrument and a computer. The gas sensor data acquisition device provided by the invention is miniaturized, low in cost, easy to install, multi-channel and low in interference, can realize multi-point synchronous monitoring and flexible signal acquisition and control, and is suitable for complex industrial environments and scientific research experiments, so that the measurement precision and efficiency are effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas concentration and temperature measurement, and in particular relates to a concentration and temperature measurement system with multiple sensors connected thereto and a calibration method thereof. Background Art

[0002] In industrial production (such as chemical processing, oil and gas transportation and storage) and scientific research (such as gas diffusion research), accurate monitoring of gas concentration and temperature data at multiple locations is crucial for ensuring production safety, improving efficiency, and obtaining reliable experimental results. Existing gas sensors often utilize an integrated package design. This design provides a certain degree of stability and reliability, meeting the monitoring needs of fixed locations to a certain extent. Furthermore, existing data acquisition devices can only achieve basic acquisition of gas concentration and temperature signals, and through simple processing, transmit the data to terminal equipment for analysis and recording.

[0003] However, the existing technology has many shortcomings. Integrated packaged sensors are large in size, and the installation and maintenance process is complicated and costly. They are only suitable for installation in fixed positions, making it difficult to achieve flexible layout and unable to meet the needs of use in small spaces. This type of sensor has a large interference with the flow field and is difficult to meet the requirements of high-precision measurement. In addition, due to cost constraints, the number of acquisition channels of existing data acquisition devices is small, which limits the ability of simultaneous multi-point monitoring and cannot meet some high-demand scientific research and industrial measurement needs. Non-packaged sensors require secondary design to meet the corresponding usage requirements, which undoubtedly increases the cost of use and the difficulty of development. Summary of the Invention

[0004] To solve the above technical problems, the present invention proposes a concentration and temperature measurement system with multi-sensor access and develops a miniaturized, low-cost, easy-to-install, multi-channel, low-interference gas sensor data acquisition device. The system can realize multi-point synchronous monitoring and flexible signal acquisition and control, and is suitable for complex industrial environments and scientific research experiments, thereby effectively improving measurement accuracy and efficiency.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a concentration and temperature measurement system with multiple sensors connected, comprising:

[0006] A small, split sensor comprising a probe and a base, wherein the probe is used to collect raw signals of gas concentration and temperature, and the base is used to mount the probe and provide wiring for the probe;

[0007] A customized data cable is used to connect the sensor base and the circuit board module to achieve signal transmission;

[0008] The circuit board module includes two modules: an adapter board and a main board. The adapter board is a transition interface device between the sensor and the main board, and has multiple channels connecting the sensor and the main board for transmitting the original signal to the main board. The main board is used to power the sensor and output signals, and has a multi-channel design that can simultaneously connect multiple groups of sensors.

[0009] A data acquisition instrument having multiple channels for acquiring voltage signals from various channels of the circuit board module and synchronously transmitting the voltage signals to the data acquisition instrument;

[0010] The computer, serving as the data processing and analysis terminal of the entire system, is used to read the measurement data output by the data acquisition instrument in real time and to process, store and visualize the measurement data.

[0011] Preferably, the base is divided into a probe connection module and a data line connection module;

[0012] The probe connection module is provided with a pin socket on the top for inserting the probe signal pin, and a pin and a boss are provided on the bottom for connecting to the matching data line connection module;

[0013] The data line connection module is provided with a groove and a pin socket on the top and pins on the bottom for connecting the data line.

[0014] Preferably, the data cable connection module is designed into two types: one has mounting platforms symmetrically provided on both sides, and the mounting platforms are provided with round holes, and the sensors are fixed in different positions by inserting screws and bolts into the round holes; the other has no mounting platform and is used in narrow spaces, and can be directly extended into the area to be tested.

[0015] Preferably, the mainboard is equipped with replaceable resistors, which can be replaced according to different types of sensors and measurement conditions to adjust the output voltage signal of the mainboard.

[0016] Preferably, a signal modulation and preliminary processing circuit is also designed inside the circuit board module to transmit the voltage signal output by the sensor to the data acquisition instrument.

[0017] In a second aspect, the present invention further provides a calibration method for a concentration and temperature measurement system with multiple sensors connected, comprising the following steps:

[0018] Prepare standard gas and select standard gas with known concentration consistent with the gas to be measured;

[0019] Connecting the measurement system, sequentially connecting the components of the measurement system according to claim 1 to ensure stable signal connections between the components;

[0020] Inject standard gas, introduce standard gas of different concentrations into the sensing area of ​​the sensor probe through special injection equipment;

[0021] Measure and record the voltage signal. When standard gas of different concentrations flows into the sensor, the voltage signal output by the sensor probe is recorded in real time.

[0022] A calibration curve is established, and the relationship curve between the voltage signal and the concentration is obtained based on the voltage signal recorded under different concentrations of standard gas.

[0023] Preferably, the concentration of the standard gas should match the concentration range of the location to be measured.

[0024] Preferably, in the step of injecting the standard gas, the flow rate and flow velocity of the standard gas are controlled.

[0025] Preferably, in the step of establishing a calibration curve, a conversion relationship between the voltage signal and the concentration is obtained by polynomial fitting.

[0026] Preferably, the method further comprises periodic calibration, and the sensor is calibrated or calibrated regularly to meet the measurement accuracy.

[0027] Compared with the prior art, the present invention has the following advantages and technical effects:

[0028] The present invention provides a concentration and temperature measurement system with multi-sensor access, comprising: a small, split sensor, including a probe and a base, the probe being used to collect original signals of gas concentration and temperature, the base being used to install the probe and provide wiring for the probe; a customized data cable being used to connect the sensor base and a circuit board module to achieve signal transmission; the circuit board module comprising two modules, an adapter board and a main board; the adapter board being a transition interface device between the sensor and the main board, being provided with multiple channels, connecting the sensor and the main board, and being used to transmit the original signal to the main board; the main board being used to power the sensor and output signals, having a multi-channel design, and being capable of simultaneously accessing multiple groups of sensors; a data acquisition instrument having multiple channels, being used to collect voltage signals from each channel of the circuit board module, and synchronously transmitting the voltage signals to the data acquisition instrument; a computer, serving as a data processing and analysis terminal for the entire system, being used to read the measurement data output by the data acquisition instrument in real time, and to process, store and visualize the measurement data.

[0029] The sensor base in this invention adopts a miniaturized and modular design for use with small-volume sensors. The small, split sensor base design not only facilitates installation and removal, but also allows for flexible deployment in space-constrained environments and effectively reduces interference with the flow field.

[0030] The present invention adopts a multi-channel synchronous acquisition circuit board design. The circuit board module includes two modules: an adapter board and a main board. The adapter board can connect to multiple sensors and can be integrated with the main board as one, or it can be made separately to achieve flexible deployment; the main board has a multi-channel design and can simultaneously connect to and process multiple sensor signals to achieve synchronous measurement of multi-point concentration and temperature, thereby improving data acquisition efficiency and monitoring coverage.

[0031] In this invention, the power supply status of each channel can be independently controlled, allowing users to enable or disable specific channels based on actual measurement needs and conditions. This design optimizes the system's power consumption and data acquisition strategy, increasing the flexibility and adaptability of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0033] Figure 1 This is a diagram of a concentration and temperature measurement system according to an embodiment of the present invention;

[0034] Figure 2 is an overall schematic diagram of a sensor according to an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of a sensor base probe connection module according to an embodiment of the present invention;

[0036] Figure 4 This is a front view of the sensor base probe connection module according to an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of a sensor base data cable connection module according to an embodiment of the present invention;

[0038] Figure 6 This is a front view of the sensor base data cable connection module according to an embodiment of the present invention;

[0039] Figure 7 This is a diagram showing the specific locations of the signal pins of the sensor according to an embodiment of the present invention;

[0040] Figure 8 This is a channel diagram of an adapter board connected to a sensor A according to an embodiment of the present invention;

[0041] Figure 9 This is a diagram of a mainboard channel connected to a sensor A according to an embodiment of the present invention;

[0042] Figure 10 This is a mainboard circuit diagram of an embodiment of the present invention;

[0043] Figure 11This is a four-wire RTD wiring diagram of a data acquisition instrument according to an embodiment of the present invention;

[0044] Figure 12 A diagram of voltage signals collected by various sensors according to an embodiment of the present invention;

[0045] Figure 13 A concentration signal diagram converted from voltage signals collected by various sensors according to an embodiment of the present invention;

[0046] Among them, 1. Probe; 2. Probe signal pin; 3. Probe connection module; 4. Data cable connection module; 5. Boss; 6. Pin socket; 7. Pin; 8. Mounting platform; 9. Round hole; 10. Groove; 11. Pin socket; 12. Base pin. DETAILED DESCRIPTION

[0047] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0048] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0049] Example 1

[0050] This embodiment provides a concentration and temperature measurement system with multiple sensors connected. The measurement system is used in scientific research experiments to measure the concentration distribution of hydrogen storage systems in fuel cell vehicles after accidental leakage. Considering that hydrogen is a flammable gas with a low lower flammable limit, it is very dangerous to conduct hydrogen leakage experiments in the laboratory. Therefore, helium, which has similar physical properties to hydrogen, is used instead of hydrogen for leakage experiments. The measurement system is as follows: Figure 1 As shown, the sensors are arranged on the ground. The measurement system includes:

[0051] A small, split sensor comprising a probe and a base, wherein the probe is used to collect raw signals of gas concentration and temperature, and the base is used to mount the probe and provide wiring for the probe;

[0052] Furthermore, as an innovative implementation method, the base is divided into a probe connection module and a data line connection module;

[0053] The probe connection module is provided with a pin socket on the top for inserting the probe signal pin, and a pin and a boss are provided on the bottom for connecting to the matching data line connection module;

[0054] The data line connection module is provided with a groove and a pin socket on the top and pins on the bottom for connecting the data line.

[0055] Specifically, a small, split sensor, each sensor consists of two modular components: a probe 1 and a base, and the base is composed of a probe connection module 3 and a data line connection module 4. Figure 2 shown.

[0056] Probe 1 is a key component for sensing the measured environment. It is responsible for collecting the original signals of gas concentration and temperature. It uses a small thermal conductivity sensor and a micro thermal conductivity meter equipped with a PT100 thermal resistor. It can measure the concentration and temperature of gases such as hydrogen, helium, and carbon dioxide. The probe has a diameter of only 8mm and has little interference with the flow field.

[0057] As an innovative implementation method, the base provides signal connection support for the probe 1, and adopts a new structure with small size and compact structure to match the sensor probe. The probe connection module 3 is provided with a pin socket 6 on the top for inserting the probe signal pin 2, and a pin 7 and a boss 5 are provided on the bottom for connecting to the data cable connection module 4. The data cable connection module 4 is provided with a groove 10 and a pin socket 11 on the top, and a base pin 12 on the bottom for connecting the data cable. The data cable is inserted into the base pin 12 to achieve the connection between the data cable and the data cable connection module. The data cable connection module is designed into two types. One has mounting platforms 8 symmetrically on both sides, and the mounting platform is provided with a circular hole 9. The sensor is fixed in different positions by inserting a screw bolt into the circular hole. It is easy to load and unload, and is designed for places with relatively open space; the other does not have a mounting platform, and is used in a small space and is directly inserted. As Figure 3-6 shown.

[0058] The measurement scene of this example is a relatively open space scene, so a data line connection module with a mounting platform is selected. The sensor of this embodiment has a total of 10 signal pins, and the specific location of each signal pin is as follows Figure 7 shown.

[0059] A customized data cable is used to connect the sensor base and the circuit board module to achieve signal transmission.

[0060] Specifically, as an innovative implementation, a data cable connects the sensor base and circuit board module, providing signal transmission. Customized data cables can be designed with one male and one female, dual female, or dual male connectors. Flexible cable lengths are available, allowing for different cable specifications to be selected based on the required distance between measurement points, ensuring connection stability and flexibility during system installation.

[0061] This example is a scientific research experiment, and the sensor parameters can be monitored in the laboratory, so a shorter length specification can be selected for the data cable.

[0062] The circuit board module includes two modules: an adapter board and a main board. The adapter board is a transition interface device between the sensor and the main board, and is provided with multiple channels to connect the sensor and the main board for transmitting the original signal to the main board. The main board is used to power the sensor and output signals, and has a multi-channel design that can connect multiple groups of sensors at the same time.

[0063] Furthermore, the circuit board module is an integrated module of an adapter board and a main board. The adapter board and main board can be separated into two independent circuit boards or integrated on the same circuit board. In this embodiment, the adapter board and main board are two independent circuit boards. The female connector of the data cable is inserted into the pins of the circuit board module, and the collected signal is transmitted from the circuit board module to the data acquisition instrument via the data cable.

[0064] Specifically, the adapter board is a transition interface device between the sensor and the main board, and is provided with multiple channels to connect the sensor and the main board and transmit the sensor signal to the main board.

[0065] In this embodiment, there are 6 groups of channels on a single adapter board. One group of channels is connected to one sensor, which can realize the synchronous measurement of 6 sensors. Figure 8 This is a channel diagram of the adapter board of this embodiment.

[0066] As an innovative implementation, the mainboard converts concentration and temperature signals collected by the sensors into voltage signals when powered on. Its multi-channel design allows simultaneous access to multiple sensor signals. This multi-channel structure enables multi-point synchronous data collection, significantly improving monitoring efficiency and data timeliness. Each channel can independently control power supply, allowing users to enable or disable individual channels based on actual needs. This allows for flexible adjustment of power consumption and system performance while meeting monitoring requirements.

[0067] As an innovative implementation method, the mainboard is equipped with replaceable resistors, which are replaced according to different types of sensors and measurement conditions, thereby adjusting the output voltage signal of the mainboard.

[0068] As an innovative implementation method, a signal modulation and preliminary processing circuit is also designed inside the circuit board module to ensure that the voltage signal output by the sensor can be stably and accurately transmitted to the back-end data acquisition instrument.

[0069] Figure 9 The following is the circuit diagram of a motherboard connected to sensor A. The motherboard has 12 channels, with each pair of channels connected to a sensor. Channel 1 receives temperature signals, and channel 2 receives concentration signals. Resistor R1 in channel 1 is 0Ω, and resistor R2 in channel 2 is selected based on the sensor model. In this example, resistor R2 is 2000Ω. After the motherboard is powered on by an external power supply, each channel can be enabled or disabled by controlling its on / off switch.

[0070] In this example, sensor A is first connected to the corresponding position a of the adapter board of the circuit board module through a data line. The connection correspondence between sensor A and the pin at the corresponding position a of the adapter board is as follows: Figure 8 As shown, the mainboard is connected via a data cable. After the external power supply is connected to the circuit board module system and powered on, the first and second channels are activated to power sensor A. In terms of signal connection, the sensor's signal pin P04 is connected to the left end of PT1 of the first channel of the mainboard, the signal pin P05 is connected to the right end of PT1, the signal pin P03 is connected to the left end of RH1, and the signal pin P06 is connected to the right end of RH1 to output the temperature signal; at the same time, the sensor A's signal pin P09 is connected to the left end of PT2 of the second channel of the mainboard, the signal pin P02 is connected to the right end of PT2, the signal pin P08 is connected to the left end of RH2 of the second channel of the mainboard, and the signal pin P07 is connected to the right end of RH2 to output the concentration signal. Other sensors are also connected to the remaining channels of the mainboard in the same way. The mainboard circuit diagram is shown in Figure 10 shown.

[0071] The data acquisition instrument has multiple channels, which collects the voltage signals from each channel of the circuit board module and transmits the signals synchronously to the data acquisition instrument. The circuit board module and the data acquisition instrument are connected as RTD four-wire system, such as Figure 11 shown.

[0072] The computer, as the data processing and analysis terminal of the entire system, can read the measurement data output by the data acquisition instrument in real time and process, store and visualize the data through specific software.

[0073] The beneficial effects of this embodiment are:

[0074] The sensor base of this embodiment adopts a miniaturized and modular design for use with small-volume sensors. The small, split sensor base design not only facilitates installation and removal, but also allows for flexible deployment in space-constrained environments and effectively reduces interference with the flow field.

[0075] This embodiment adopts a multi-channel synchronous acquisition circuit board design. The circuit board module includes two modules: an adapter board and a main board. The adapter board can connect to multiple sensors and can be integrated with the main board as one, or it can be manufactured separately for flexible deployment. The main board has a multi-channel design and can simultaneously connect to and process multiple sensor signals to achieve synchronous measurement of multi-point concentration and temperature, thereby improving data acquisition efficiency and monitoring coverage.

[0076] In this embodiment, the power supply status of each channel can be independently controlled, allowing users to enable or disable specific channels based on actual measurement needs and conditions. This design optimizes system power consumption and data acquisition strategies, increasing the flexibility and adaptability of the overall system.

[0077] This embodiment features replaceable resistors on the motherboard. Users can select the appropriate resistor based on different sensor types and measurement conditions to adjust the motherboard's output voltage signal. This flexible resistor replacement mechanism allows the motherboard to adapt to a variety of sensors, enhancing system compatibility and adaptability while also improving measurement accuracy and reliability.

[0078] The mainboard of this embodiment integrates signal modulation and preliminary processing circuits to ensure that the voltage signal output by the sensor can be stably and accurately transmitted to the data acquisition instrument, avoiding signal loss and interference, and improving the stability and data quality of the entire system.

[0079] Example 2

[0080] This embodiment provides a calibration method for a concentration and temperature measurement system with multiple sensors connected, including:

[0081] Prepare standard gas and select standard gas with known concentration consistent with the gas to be measured;

[0082] Connecting the measurement system, sequentially connecting the components of the measurement system according to claim 1 to ensure stable signal connections between the components;

[0083] Inject standard gas, introduce standard gas of different concentrations into the sensing area of ​​the sensor probe through special injection equipment;

[0084] Measure and record the voltage signal. When standard gas of different concentrations flows into the sensor, the voltage signal output by the sensor probe is recorded in real time.

[0085] A calibration curve is established, and the relationship curve between the voltage signal and the concentration is obtained based on the voltage signal recorded under different concentrations of standard gas.

[0086] Specifically, before the experiment in Example 1 begins, the sensor needs to be calibrated to convert the sensor voltage signal into concentration data. The specific calibration operation steps include:

[0087] S1. Prepare standard gas.

[0088] Through theoretical calculation and the distance from the leak point, it is determined that sensor B has the highest concentration, around 70%-90%, and the concentrations of the other sensors are lower, below 30%. Therefore, three groups of standard helium with concentrations of 10%, 60% and 100% are selected for sensor B, and three groups of standard helium with concentrations of 10%, 30% and 100% are selected for calibration of the other sensors.

[0089] S2. Connect the measurement system.

[0090] Connect the measurement system in the order of the components in Example 1 to ensure stable signal connections between the components.

[0091] S3. Inject standard gas.

[0092] Standard gases of varying concentrations are introduced into the sensor probe's sensing area via dedicated injection equipment. To ensure calibration accuracy, the gas flow rate and injection stability must be strictly controlled.

[0093] S4. Measure and record the voltage signal.

[0094] When standard gases of different concentrations flow into the sensor, the voltage signal output by the sensor probe is recorded in real time. The sensor converts the gas concentration information into a corresponding voltage signal, which is then collected and stored by the data acquisition instrument and computer.

[0095] S5. Establish a calibration curve.

[0096] Based on the voltage signals recorded under different concentrations of standard gas, a relationship curve between voltage signal and concentration (calibration curve) is obtained. The establishment of the calibration curve can convert the voltage signal output by the sensor into the actual gas concentration value.

[0097] The voltage signals of each sensor when the leakage flow rate is 10 NLPM are as follows: Figure 12 As shown, after calibration, the calibration curves of the 6 sensors used in this embodiment are shown in Table 1.

[0098] Table 1

[0099] Sensor number Calibration curve polynomial fitting A <h2 style=";text-align:left;direction:ltr"><![CDATA[y=0.11x <h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> -8.25x+149.08<h2 style=";text-align:left;direction:ltr"><!-- 6 --> ]]><h2 style=";text-align:left;direction:ltr"> B <![CDATA[y=0.10x 2 -8.04x+148.05]]> C <h2 style=";text-align:left;direction:ltr"><![CDATA[y=0.09x <h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> -7.75x+146.68]]><h2 style=";text-align:left;direction:ltr"> D <![CDATA[y=0.10x 2 -8.15x+150.38]]> E <![CDATA[y=0.10x 2 -7.89x+147.59]]> F <![CDATA[y=0.10x 2 -7.97x+148.06]]>

[0100] Where x is the collected voltage signal (in V), and y is the mole fraction.

[0101] The voltage signal is converted into a concentration signal through the calibration curve. The result is as follows Figure 13 shown.

[0102] S6. Regular calibration.

[0103] Since the sensor may be affected by factors such as the operating environment and time, it is recommended to calibrate or verify it regularly to ensure that the measurement accuracy is not affected. Regular calibration can be performed by using standard gas and repeating the above steps.

[0104] For temperature measurement, the sensor used in this embodiment integrates a standard thermal resistor (such as PT100), and the circuit board module is connected to the data acquisition instrument (such as Figure 11 As shown in the figure, the temperature value can be directly obtained from the relevant channel of the data acquisition instrument, so there is no need for separate calibration, only regular calibration is required.

[0105] This embodiment, for concentration measurement, first predicts the approximate concentration range at the location to be measured based on theoretical models or numerical simulations. Calibration is then performed using a standard gas that matches this concentration range. After collecting voltage signals corresponding to standard gases of varying concentrations, a polynomial fit is used to derive a calibration equation, ensuring the accuracy of the measurement results.

[0106] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A multi-sensor access concentration and temperature measurement system, characterized in that: include: A small, split sensor comprising a probe and a base, wherein the probe is used to collect raw signals of gas concentration and temperature, and the base is used to mount the probe and provide wiring for the probe; A customized data cable is used to connect the sensor base and the circuit board module to achieve signal transmission; The circuit board module includes two modules: an adapter board and a main board. The adapter board is a transition interface device between the sensor and the main board, and has multiple channels connecting the sensor and the main board for transmitting the original signal to the main board. The main board is used to power the sensor and output signals, and has a multi-channel design that can simultaneously connect multiple groups of sensors. A data acquisition instrument having multiple channels for acquiring voltage signals from various channels of the circuit board module and synchronously transmitting the voltage signals to the data acquisition instrument; The computer, serving as the data processing and analysis terminal of the entire system, is used to read the measurement data output by the data acquisition instrument in real time and to process, store and visualize the measurement data.

2. The system according to claim 1, wherein: The base is divided into a probe connection module and a data line connection module; The probe connection module is provided with a pin socket on the top for inserting the probe signal pin, and a pin and a boss are provided on the bottom for connecting to the matching data line connection module; The data line connection module is provided with a groove and a pin socket on the top and pins on the bottom for connecting the data line.

3. The system according to claim 1, wherein: The data line connection module is designed into two types: one has mounting platforms symmetrically on both sides, and the mounting platforms are provided with round holes, and the sensors are fixed in different positions by inserting screws and bolts into the round holes; the other does not have a mounting platform and is used in small spaces, and can be directly extended into the area to be measured.

4. The system according to claim 1, wherein: The mainboard is equipped with replaceable resistors, which can be replaced according to different types of sensors and measurement conditions to adjust the output voltage signal of the mainboard.

5. The system according to claim 1, wherein: The circuit board module is also designed with a signal modulation and preliminary processing circuit to transmit the voltage signal output by the sensor to the data acquisition instrument.

6. A calibration method for a concentration and temperature measurement system with multiple sensors connected, characterized in that: The following steps are involved: Prepare standard gas and select standard gas with known concentration consistent with the gas to be measured; Connecting the measurement system, sequentially connecting the components of the measurement system according to claim 1 to ensure stable signal connections between the components; Inject standard gas, introduce standard gas of different concentrations into the sensing area of ​​the sensor probe through special injection equipment; Measure and record the voltage signal. When standard gas of different concentrations flows into the sensor, the voltage signal output by the sensor probe is recorded in real time. A calibration curve is established, and the relationship curve between the voltage signal and the concentration is obtained based on the voltage signal recorded under different concentrations of standard gas.

7. The calibration method according to claim 6, characterized in that: The concentration of the standard gas should match the concentration range of the location to be measured.

8. The calibration method according to claim 6, characterized in that: In the step of injecting the standard gas, the flow rate and flow velocity of the standard gas are controlled.

9. The calibration method according to claim 6, characterized in that: In the step of establishing the calibration curve, a conversion relationship between the voltage signal and the concentration is obtained by polynomial fitting.

10. The calibration method according to claim 6, characterized in that: It also includes regular calibration, which involves calibrating or checking the sensor regularly to ensure measurement accuracy.

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