Remote maintenance control circuit, device and method for a gas detector

Abstract

The application discloses a kind of remote maintenance control circuit, device and method of gas detector, a kind of remote maintenance control circuit of gas detector includes main control module, gas detection module, signal amplification module, alarm module, communication module and communication switch control module;The gas detection module is electrically connected with the signal amplification module, the signal amplification module is electrically connected with the Zhu Kui module, the main control module is electrically connected with the communication switch control module, the communication switch control module is electrically connected with the communication module;The alarm module is electrically connected with the main control module.The application can improve the accuracy and effectiveness of the gas detector detection work, reduce the influence of artificial misoperation on detector.

Description

Technical Field

[0001] This invention relates to the field of fire protection technology, and in particular to a remote maintenance control circuit, device and method for a gas detector. Background Technology

[0002] According to relevant regulations, gas detectors must be maintained and calibrated at least once a year to ensure that the detector's detection function is in a stable state. The most stringent requirement is once every three months, unless the gas detectors meet the maintenance-free standard. However, industrial gas detectors do not meet this requirement.

[0003] During maintenance and calibration, existing gas detectors are generally operated via infrared. However, some manufacturers may not have infrared functionality in their detectors in order to save costs, making it impossible to complete maintenance on-site. They need to send the detectors back to the original manufacturer or replace them with new ones, which is undoubtedly a waste of resources.

[0004] During on-site maintenance, if the accuracy of the standard gas concentration during calibration is not taken into account, or if erroneous operation occurs, this will affect the sensitivity of the detector, which in turn will affect the detector's most important function, resulting in late alarms, early alarms, or even no alarms at all.

[0005] In existing technologies, the common practice for on-site maintenance involves maintenance personnel preparing a standard gas and triggering the detector for zeroing, calibration, and adjustment using an infrared function. Multiple different commands require repeated input via an infrared remote control. Furthermore, to prevent customer misoperation, a password is often set on-site, and personnel must carry the gas cylinder and calibration cover to calibrate the detector. The entire maintenance process is cumbersome and significantly increases the possibility of human error. In addition, the gas itself in the standard cylinder carries inherent precision errors, leading to calibration deviations. Therefore, developing a reliable gas detector maintenance method is a pressing issue for those skilled in the art. Summary of the Invention

[0006] The purpose of this application is to provide a remote maintenance control circuit, device, and method for a gas detector. In this solution, operation via a local APP reduces the complex command input steps of infrared remote control, greatly improving maintenance efficiency. At the same time, this application can compensate for the drift sensitivity of the gas detector, thereby improving the accuracy of the gas detector's detection work.

[0007] To solve the above-mentioned technical problems, this application provides a remote maintenance control circuit for a gas detector, including a main control module, a gas detection module, a signal amplification module, an alarm module, a communication module, and a communication switch control module; The gas detection module is electrically connected to the signal amplification module, the signal amplification module is electrically connected to the main control module, the main control module is electrically connected to the communication switch control module, and the communication switch control module is electrically connected to the communication module; the alarm module is electrically connected to the main control module. The main control module is used to periodically control the gas detection module to activate the gas detection function; the gas detection module is used to periodically acquire the sample value of the gas to be detected. The signal amplification module is used to amplify the sampled value of the gas to be detected; the communication module is used to realize wireless data transmission between the main control module and the cloud platform, and upload the sampled value of the detected gas and the preset calibration standard value to the cloud platform; The communication switch control module is used to control the on / off enable control of the communication function between the gas detector and the cloud platform; the cloud platform is used to acquire the periodic sample value of the gas to be detected; if the sample value of the gas to be detected is greater than the preset alarm threshold, the alarm module is controlled to output an alarm; if the sample value of the gas to be detected is less than the preset calibration standard value, the gas detector is determined to be in a fault state. The cloud platform determines the drift sensitivity of the gas detector based on the periodic sampling values ​​of the gas to be detected and the preset calibration standard value; if the drift sensitivity of the gas detector is less than the preset sensitivity threshold, a compensation value is sent to compensate for the drift sensitivity of the gas detector.

[0008] Preferably, the signal amplification module includes a first signal amplification unit, a second signal amplification unit, and a third signal amplification unit; The first signal amplification unit is electrically connected to the gas detection module, the second signal amplification unit and the input power supply respectively. The second signal amplification unit is electrically connected to the gas detection module. The third signal amplification unit is electrically connected to the first signal amplification unit, the second signal amplification unit and the main control module respectively.

[0009] Preferably, the communication switch control module includes a first communication switch control unit and a second communication switch control unit; The first communication switch control unit is electrically connected to the input power supply, the transmitting unit of the communication module, and the main control module, respectively. The second communication switch control unit is electrically connected to the input power supply, the receiving unit of the communication module, and the main control module, respectively.

[0010] Preferably, the first communication switch control unit includes a first transistor, a first resistor, and a second resistor; The base of the first transistor is electrically connected to the first end of the first resistor and the first end of the second resistor, respectively. The second end of the first resistor is electrically connected to the input power supply. The second end of the second resistor is electrically connected to the emitter of the first transistor and the transmitting unit of the communication module, respectively. The collector of the first transistor is electrically connected to the main control module.

[0011] Preferably, the second communication switch control unit includes a second transistor, a third resistor, and a fourth resistor; The base of the second transistor is electrically connected to the first end of the third resistor and the input power supply, respectively. The second end of the third resistor is electrically connected to the emitter of the second transistor, the main control module and the first end of the fourth resistor, respectively. The second end of the fourth resistor is electrically connected to the collector of the second transistor, the input power supply and the receiving unit of the communication module, respectively.

[0012] To address the aforementioned technical problems, this application provides a remote maintenance control device for a gas detector, including the aforementioned remote maintenance control circuit for a gas detector.

[0013] To address the aforementioned technical problems, this application provides a remote maintenance control method for a gas detector, applied to a remote maintenance control circuit for the aforementioned gas detector. The control method includes: The gas detection module is periodically controlled to activate the gas detection function and acquire the sample value of the gas to be detected; The sampled values ​​of the gas to be detected are amplified; Communicates with the cloud platform to transmit wireless data; The sampled values ​​of the detected gas and the preset calibration standard values ​​are uploaded to the cloud platform; The system acquires periodic sample values ​​of the gas to be detected. If the sample value of the gas to be detected is greater than a preset alarm threshold, the system controls the alarm module to output an alarm. If the sampled value of the gas to be detected is less than the preset calibration standard value, the gas detector is determined to be in a faulty state. The drift sensitivity of the gas detector is determined based on the periodic sampling values ​​of the gas to be detected and the preset calibration standard values. If the drift sensitivity of the gas detector is less than a preset sensitivity threshold, a compensation value is sent to compensate for the drift sensitivity of the gas detector.

[0014] Preferably, the step of issuing a compensation value to compensate for the drift sensitivity of the gas detector if the drift sensitivity of the gas detector is less than a preset sensitivity threshold includes: The cloud platform is controlled to periodically send cloud platform sensitivity compensation commands to the gas detector; The gas detector is controlled to parse the sensitivity compensation command of the cloud platform; Compare the current sensitivity value of the gas detector with its historical sensitivity value; If the current sensitivity value of the gas detector is within the preset compensation range; This allows the zeroing value to be written to achieve sensitivity compensation for the drift sensitivity of the gas detector.

[0015] Preferably, the step of issuing a compensation value to compensate for the drift sensitivity of the gas detector if the drift sensitivity of the gas detector is less than a preset sensitivity threshold further includes: If the current sensitivity value of the gas detector is not within the preset compensation range; Then, the value of zeroing the calibration is not allowed to be written, and the command execution result is reported to the cloud platform.

[0016] Preferably, the step of controlling the gas detector to parse the cloud platform sensitivity compensation command includes: The cloud platform sensitivity compensation command includes historical sampling data, sensitivity threshold, and the adoption slope of the gas sampling value to be detected.

[0017] This invention discloses a remote maintenance control circuit and device for a gas detector, which has the following beneficial effects. The remote maintenance control circuit for a gas detector includes: a main control module, a gas detection module, a signal amplification module, an alarm module, a communication module, and a communication switch control module. The gas detection module is electrically connected to the signal amplification module, the signal amplification module is electrically connected to the main control module, the main control module is electrically connected to the communication switch control module, and the communication switch control module is electrically connected to the communication module. The alarm module is electrically connected to the main control module. In this application, operation via a near-end APP reduces the complex command input steps of infrared remote control, greatly improving maintenance efficiency. Simultaneously, this application can compensate for the drift sensitivity of the gas detector, improving the accuracy of the gas detector's detection operation. Therefore, this invention can improve the accuracy and effectiveness of gas detector calibration and reduce the impact of human error on the detector. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort: Figure 1 This is a schematic diagram of the structure of a remote maintenance control circuit for a gas detector according to a preferred embodiment of the present invention; Figure 2 This is a circuit diagram of the signal amplification module of a remote maintenance control circuit for a gas detector according to a preferred embodiment of the present invention. Figure 3 This is a circuit diagram of the communication switch control module of a remote maintenance control circuit for a gas detector according to a preferred embodiment of the present invention. Figure 4 This is a flowchart of a remote maintenance control method for a gas detector according to a preferred embodiment of the present invention; Figure 5 This is a statistical chart of the %LEL-ADC corresponding values ​​of a gas detector in a remote maintenance control method for a gas detector according to a preferred embodiment of the present invention. Figure 6 This is a flowchart of a preferred embodiment of the present invention, in which a compensation value is sent to compensate for the drift sensitivity of the gas detector if the drift sensitivity of the gas detector is less than a preset sensitivity threshold. Detailed Implementation

[0019] The core of this application is to provide a remote maintenance control circuit, device, and method for a gas detector. In this solution, operation via a local APP reduces the complex command input steps of infrared remote control, greatly improving maintenance efficiency. At the same time, this application can compensate for the drift sensitivity of the gas detector, improving the accuracy of the gas detector's detection work.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] Please see Figure 1 , Figure 1 The schematic diagram of a remote maintenance control circuit for a gas detector provided in this application includes a main control module 1, a gas detection module 2, a signal amplification module 3, an alarm module 4, a communication module 5, and a communication switch control module 6; Gas detection module 2 is electrically connected to signal amplification module 3; signal amplification module 3 is electrically connected to main control module 1; main control module 1 is electrically connected to communication switch control module 6; communication switch control module 6 is electrically connected to communication module 5; alarm module 4 is electrically connected to main control module 1. In existing technologies, the general practice for on-site maintenance involves maintenance personnel preparing a standard gas and triggering the detector for zeroing, calibration, and adjustment using an infrared function. Multiple different commands require repeated input via an infrared remote control. Furthermore, to prevent customer misoperation, a password is often set on-site, and personnel must carry the gas cylinder and calibration cover to calibrate the detector. The entire maintenance process is cumbersome and significantly increases the possibility of human error. In addition, during on-site maintenance, the gas itself in the standard cylinder contains inherent precision errors, leading to calibration deviations.

[0022] To address the aforementioned shortcomings, this application improves the accuracy and effectiveness of gas detector calibration through the cooperation of the main control module 1, gas detection module 2, signal amplification module 3, alarm module 4, communication module 5, and communication switch control module 6.

[0023] Specifically, in this embodiment, the main control module 1 is used to periodically control the gas detection module 2 to activate the gas detection function; the gas detection module 2 is used to periodically acquire the sample value of the gas to be detected. The signal amplification module 3 is used to amplify the sampled values ​​of the gas to be detected; the communication module 5 is used to realize wireless data transmission between the main control module 1 and the cloud platform, and upload the sampled values ​​of the detected gas and the preset calibration standard values ​​to the cloud platform. The communication switch control module 6 is used to control the on / off enable control of the communication function between the gas detector and the cloud platform; the cloud platform is used to acquire periodic gas sampling values ​​to be detected. If the gas sampling value to be detected is greater than the preset alarm threshold, the alarm module 4 is controlled to output an alarm; if the gas sampling value to be detected is less than the preset calibration standard value, the gas detector is determined to be in a fault state. The cloud platform determines the drift sensitivity of the gas detector based on the periodic sampling values ​​of the gas to be detected and the preset calibration standard values; if the drift sensitivity of the gas detector is less than the preset sensitivity threshold, a compensation value is sent to compensate for the drift sensitivity of the gas detector.

[0024] Specifically, during the production process, gas detectors are calibrated using standard gases to set their alarm thresholds and zero-point values. According to national standards, industrial gas detectors must have a detection range of 3%LEL-100%LEL. LEL stands for Lower Explosive Limit, and the LEL varies for each gas being detected. For example, a standard methane gas with a volume fraction of 0.5% has a guaranteed lower limit of 10%LEL.

[0025] The gas detector's sensor exhibits excellent linearity; that is, within the full range of 3-100% LEL, the ADC value of the detection output is essentially a straight line. Accurate detection across the entire range can be achieved by calibrating several standard points. However, gas detectors naturally experience some drift during long-term operation, and the sensitivity error increases with the range even over a wide measurement range due to this drift. This is the fundamental reason why periodic on-site maintenance is necessary.

[0026] The drift of a gas detector accumulates over a long period, manifesting as changes in the ADC sampling value under clean air over time. Due to the limited memory space of the gas detector's controller, it is impossible to store ADC values ​​accumulated over extended periods.

[0027] Specifically, in this embodiment, the gas detector is equipped with wireless communication functionality, which allows it to report the periodic sampling ADC value and the calibrated standard point to the cloud platform. By comparing the periodic sampling ADC value through big data statistics on the cloud platform, it can be confirmed whether the gas detector itself has drifted. Since the gas detector is in clean air most of the time, the point obtained by the platform after statistical analysis of the periodic sampling ADC value is also used as the zero point after compensation.

[0028] Specifically, in this embodiment, the drift sensitivity of the gas detector is determined by statistically analyzing the ADC sampling values ​​reported by the gas detector through the cloud platform. If the drift sensitivity slope of the gas detector is less than the preset sensitivity threshold, the gas detector can be automatically compensated by issuing a specific instruction. The compensation value is calculated by the platform and then issued. Alternatively, the relevant maintenance personnel can be notified through the cloud platform to make adjustments.

[0029] In summary, this invention provides a remote maintenance control circuit for a gas detector. This circuit includes a main control module 1, a gas detection module 2, a signal amplification module 3, an alarm module 4, a communication module 5, and a communication switch control module 6. The gas detection module 2 is electrically connected to the signal amplification module 3, the signal amplification module 3 is electrically connected to the main control module, the main control module 1 is electrically connected to the communication switch control module 6, and the communication switch control module 6 is electrically connected to the communication module 5. The alarm module 4 is electrically connected to the main control module 1. In this application, operation via a near-end APP reduces the complex command input steps of infrared remote control, greatly improving maintenance efficiency. Simultaneously, this application can compensate for the drift sensitivity of the gas detector, improving the accuracy of the gas detector's detection operation. Therefore, this invention can improve the accuracy and effectiveness of gas detector calibration and reduce the impact of human error on the detector.

[0030] Based on the above embodiments: Please refer to Figure 2 , Figure 2 The circuit diagram of a signal amplification module provided in this application.

[0031] In a preferred embodiment, the signal amplification module 3 includes a first signal amplification unit 31, a second signal amplification unit 32, and a third signal amplification unit 33; The first signal amplification unit 31 is electrically connected to the gas detection module 2, the second signal amplification unit 32 and the input power supply respectively. The second signal amplification unit 32 is electrically connected to the gas detection module 2. The third signal amplification unit 33 is electrically connected to the first signal amplification unit 31, the second signal amplification unit 32 and the main control module 1 respectively.

[0032] Specifically, in this embodiment, S1 is a gas detector. When a corresponding detection gas is detected in the environment, the built-in resistance of S1 changes, thereby causing the output voltage Vout obtained by voltage division to change accordingly. After being amplified by the operational amplifier circuit composed of the first signal amplification unit 31, the second signal amplification unit 32, and the third signal amplification unit 33, the main control module 1 obtains the sampled ADC value of AD_Out.

[0033] Please refer to Figure 3 , Figure 3 The circuit diagram of a signal switch control module provided in this application.

[0034] In a preferred embodiment, the communication switch control module 6 includes a first communication switch control unit 61 and a second communication switch control unit 62; The first communication switch control unit 61 is electrically connected to the input power supply, the transmitting unit of the communication module 5, and the main control module 1, respectively. The second communication switch control unit 62 is electrically connected to the input power supply, the receiving unit of the communication module 5, and the main control module 1, respectively.

[0035] In a preferred embodiment, the first communication switch control unit includes a first transistor Q9, a first resistor R46, and a second resistor R48; The base of the first transistor Q9 is electrically connected to the first end of the first resistor R46 and the first end of the second resistor R48, respectively. The second end of the first resistor R46 is electrically connected to the input power supply. The second end of the second resistor R48 is electrically connected to the emitter of the first transistor Q9 and the transmitter unit of the communication module 5, respectively. The collector of the first transistor Q9 is electrically connected to the main control module 1.

[0036] In a preferred embodiment, the second communication switch control unit includes a second transistor Q10, a third resistor R63, and a fourth resistor R64; The base of the second transistor Q10 is electrically connected to the first end of the third resistor R63 and the input power supply. The second end of the third resistor R63 is electrically connected to the emitter of the second transistor Q10, the main control module 1 and the first end of the fourth resistor R64. The second end of the fourth resistor R64 is electrically connected to the collector of the second transistor Q10, the input power supply and the receiving unit of the communication module 5.

[0037] Specifically, in this embodiment, the periodically sampled ADC values ​​are sent to the cloud platform via wireless communication, and the monitoring status of the gas detector is also sent to the cloud platform. If a gas leak is detected locally, a remote alarm is triggered.

[0038] Specifically, in this embodiment, the main control module 1 achieves serial communication with the communication module by matching the logic levels of the first transistor Q9 and the second transistor Q10. When the communication module performs a series of operations such as networking, accessing the platform, and sending data, it uses AT commands.

[0039] This application also provides a remote maintenance control device for a gas detector, including a remote maintenance control circuit for the gas detector.

[0040] Please refer to Figure 4 , Figure 4 A flowchart of a remote maintenance control method for a gas detector provided in this application.

[0041] Please see Figure 5 , Figure 5 A statistical chart of the %LEL-ADC values ​​of a gas detector provided in this application.

[0042] This application also provides a remote maintenance control method for a gas detector, applied to a remote maintenance control circuit for a gas detector, the control method including: S1. Periodically control the gas detection module 2 to activate the gas detection function and obtain the sample value of the gas to be detected; S2. Amplify the sampled values ​​of the gas to be detected; S3. Communicates with the cloud platform to perform wireless data transmission; S4. Upload the detected gas sampling values ​​and the preset calibration standard values ​​to the cloud platform; S5. Obtain periodic gas sampling values. If the gas sampling value is greater than the preset alarm threshold, control the alarm module 4 to output an alarm. S6. If the sampled value of the gas to be detected is less than the preset calibration standard value, the gas detector is determined to be in a fault state. S7. Determine the drift sensitivity of the gas detector based on the periodic sampling values ​​of the gas to be detected and the preset calibration standard values. S8. If the drift sensitivity of the gas detector is less than the preset sensitivity threshold, a compensation value is sent to compensate for the drift sensitivity of the gas detector.

[0043] Please refer to Figure 5 , Figure 5 A flowchart of a remote maintenance control method for a gas detector provided in this application.

[0044] In a preferred embodiment, if the drift sensitivity of the gas detector is less than a preset sensitivity threshold, then issuing a compensation value to compensate for the drift sensitivity of the gas detector includes: S81. Control the cloud platform to periodically send cloud platform sensitivity compensation commands to the gas detector. S82, control the gas detector to parse the cloud platform sensitivity compensation command; S83. Compare the current sensitivity value of the gas detector with the historical sensitivity value; S84. If the current sensitivity value of the gas detector is within the preset compensation range; S85 allows the zeroing value to be written to achieve sensitivity compensation for the drift sensitivity of the gas detector.

[0045] In a preferred embodiment, if the drift sensitivity of the gas detector is less than a preset sensitivity threshold, the process of issuing a compensation value to compensate for the drift sensitivity of the gas detector further includes: S86. If the current sensitivity value of the gas detector is not within the preset compensation range; S87 then disallows the writing of the calibration zeroing value and reports the command execution result to the cloud platform.

[0046] In a preferred embodiment, controlling the gas detector to parse the cloud platform sensitivity compensation command includes: The cloud platform sensitivity compensation command includes historical sampling data, sensitivity thresholds, and the adoption slope of the gas sampling values ​​to be detected.

[0047] Specifically, gas detectors require calibration using standard gases during production. For example, if the gas detector is immersed in 0.5% methane gas (by volume), its current sampled value becomes the ADC value for that 0.5% methane gas, and the alarm threshold for the same 0.5% methane gas also becomes the gas detector's alarm threshold. Similarly, if 99% nitrogen gas is introduced as a reference point during production, the gas detector will not undergo any chemical reaction with the inert gas, and its current ADC sampled value becomes the zero-point value. During use, if the main control module 1 periodically samples the ADC value and it exceeds the calibrated alarm threshold, the gas detector will be considered in an alarm state; if it is less than the calibrated zero-point ADC value, the gas detector will be considered in a fault state.

[0048] Specifically, for example, when calibrating the zero point value of the gas detector, the ADC sampling value after amplification by the signal amplification module 3 is 300; when calibrating to 50% LEL, the ADC sampling value is 1300; then the ADC sampling accuracy corresponding to a gas concentration of x% LEL is: (1300-300) / 50=20. 20 represents the detection accuracy of the gas detector, which is the slope. Therefore, this application can obtain the ADC value range for each concentration % LEL, i.e., the ADC value range corresponding to 25% LEL is [800, 820), and the range corresponding to 10% LEL is [500, 520). If the alarm threshold is 25% LEL, then when the current ADC sampling value is greater than 820 corresponding to 25% LEL, the gas detector is judged to be in an alarm state. Similarly, when the ADC sampling value is less than zero, or when the margin is less than 200, the gas detector will be judged to be in a fault state.

[0049] Specifically, in this embodiment, the drift of the gas detector manifests as a change in the gas detector's performance over time. That is, in a clean environment, the current sampled ADC value is 300. After two weeks of continuous operation, the sampled ADC value under the same conditions may stabilize at 350. In this case, the accuracy, i.e., the slope, has changed to (1300-350) / 50=19, and the ADC range corresponding to each concentration %LEL will also change accordingly. Please refer to [link / reference]. Figure 5 , Figure 5 This is a %LEL-ADC statistical chart for gas detectors. After two weeks of continuous operation of multiple devices, the mean value of the zero point fluctuated between 250 and 350, and the mean value of 50%LEL was between 1100 and 1350.

[0050] Specifically, considering the characteristics of gas detectors, the sensors of these detectors utilize catalytic combustion. When they encounter the gas being measured, the gas-sensitive material reacts with the catalyst. Since the catalyst is consumable, these sensors require lifespan compensation and maintenance. In clean gas, no reaction occurs, and the catalyst is not consumed. However, in air, some gases may react with the catalyst. Therefore, under constant environmental conditions, the rate of change of sensor drift per unit time is relatively fixed.

[0051] Specifically, based on the example above, the calibrated zero-point ADC value is 300, and the calibrated alarm 50% LEL ADC value is 1300. Therefore, the ADC range corresponding to 25% LEL is [800, 820]. During normal use, non-portable gas detectors operate in the same location, and under normal conditions without gas leakage, the detected ADC value should be relatively stable. The detector periodically reports the current sampled ADC value to the cloud platform via wireless function. The cloud platform statistically analyzes these periodic sampled values. When the difference between two consecutive ADC values ​​reported to the cloud platform exceeds 20 ADC samples, it corresponds to 1% LEL and is not included in the compensation value calculation. Assume that after two weeks of operation, the current ADC value statistically recorded on the platform changes from the initial 300 to 320. Based on the data from the sensor's %LEL-ADC statistics, the rate of change is (320-300) / (350-250)=0.2. Therefore, the compensated ADC value corresponding to 50%LEL is 1300+(1350-1100)*0.2=1350.

[0052] Specifically, in this embodiment, the cloud platform sends a compensation command to the gas detector every half month. Upon receiving the command from the cloud platform and confirming its correctness, the detector reassigns the ADC value to 50%LEL. Simultaneously, the gas detector uploads the results to ensure successful interaction between the detector and the cloud platform. If the gas detector does not detect any gas leak within the half-month period covered by the cloud platform, and the periodically reported gas concentration %LEL is not 0, this statistical period is invalid, and no compensation command is issued until the next statistical period begins.

[0053] For a description of the remote maintenance control circuit for a gas detector provided in this application, please refer to the above embodiments; further details will not be repeated here.

[0054] It should be noted that, in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0055] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A remote maintenance control circuit for a gas detector, characterized in that, It includes a main control module, a gas detection module, a signal amplification module, an alarm module, a communication module, and a communication switch control module; The gas detection module is electrically connected to the signal amplification module, the signal amplification module is electrically connected to the main control module, the main control module is electrically connected to the communication switch control module, and the communication switch control module is electrically connected to the communication module; the alarm module is electrically connected to the main control module. The main control module is used to periodically control the gas detection module to activate the gas detection function; the gas detection module is used to periodically acquire the sample value of the gas to be detected. The signal amplification module is used to amplify the sampled value of the gas to be detected; the communication module is used to realize wireless data transmission between the main control module and the cloud platform, and upload the sampled value of the detected gas and the preset calibration standard value to the cloud platform; The communication switch control module is used to control the on / off enable control of the communication function between the gas detector and the cloud platform; the cloud platform is used to acquire the periodic sample value of the gas to be detected; if the sample value of the gas to be detected is greater than the preset alarm threshold, the alarm module is controlled to output an alarm; if the sample value of the gas to be detected is less than the preset calibration standard value, the gas detector is determined to be in a fault state. The cloud platform determines the drift sensitivity of the gas detector based on the periodic sampling values ​​of the gas to be detected and the preset calibration standard value; if the drift sensitivity of the gas detector is less than the preset sensitivity threshold, a compensation value is sent to compensate for the drift sensitivity of the gas detector. The signal amplification module includes a first signal amplification unit, a second signal amplification unit, and a third signal amplification unit; The first signal amplification unit is electrically connected to the gas detection module, the second signal amplification unit, and the input power supply, respectively. The second signal amplification unit is electrically connected to the gas detection module, and the third signal amplification unit is electrically connected to the first signal amplification unit, the second signal amplification unit, and the main control module, respectively. The communication switch control module includes a first communication switch control unit and a second communication switch control unit; The first communication switch control unit is electrically connected to the input power supply, the transmitting unit of the communication module, and the main control module, respectively. The second communication switch control unit is electrically connected to the input power supply, the receiving unit of the communication module, and the main control module, respectively.

2. The remote maintenance control circuit for a gas detector according to claim 1, characterized in that, The first communication switch control unit includes a first transistor, a first resistor, and a second resistor; The base of the first transistor is electrically connected to the first end of the first resistor and the first end of the second resistor, respectively. The second end of the first resistor is electrically connected to the input power supply. The second end of the second resistor is electrically connected to the emitter of the first transistor and the transmitting unit of the communication module, respectively. The collector of the first transistor is electrically connected to the main control module.

3. The remote maintenance control circuit for a gas detector according to claim 1, characterized in that, The second communication switch control unit includes a second transistor, a third resistor, and a fourth resistor; The base of the second transistor is electrically connected to the first end of the third resistor and the input power supply, respectively. The second end of the third resistor is electrically connected to the emitter of the second transistor, the main control module and the first end of the fourth resistor, respectively. The second end of the fourth resistor is electrically connected to the collector of the second transistor, the input power supply and the receiving unit of the communication module, respectively.

4. A remote maintenance control device for a gas detector, characterized in that, The remote maintenance control circuit for a gas detector as described in any one of claims 1 to 3 is included.

5. A remote maintenance control method for a gas detector, characterized in that, The remote maintenance control circuit applied to a gas detector according to any one of claims 1 to 4, the control method comprising: The gas detection module is periodically controlled to activate the gas detection function and acquire the sample value of the gas to be detected; The sampled values ​​of the gas to be detected are amplified; Communicates with the cloud platform to transmit wireless data; The sampled values ​​of the detected gas and the preset calibration standard values ​​are uploaded to the cloud platform; The system acquires periodic sample values ​​of the gas to be detected. If the sample value of the gas to be detected is greater than a preset alarm threshold, the system controls the alarm module to output an alarm. If the sampled value of the gas to be detected is less than the preset calibration standard value, the gas detector is determined to be in a faulty state. The drift sensitivity of the gas detector is determined based on the periodic sampling values ​​of the gas to be detected and the preset calibration standard values. If the drift sensitivity of the gas detector is less than a preset sensitivity threshold, a compensation value is sent to compensate for the drift sensitivity of the gas detector.

6. The remote maintenance control method for a gas detector according to claim 5, characterized in that, The step of issuing a compensation value to compensate for the drift sensitivity of the gas detector if the drift sensitivity is less than a preset sensitivity threshold includes: The cloud platform is controlled to periodically send cloud platform sensitivity compensation commands to the gas detector; The gas detector is controlled to parse the sensitivity compensation command of the cloud platform; Compare the current sensitivity value of the gas detector with its historical sensitivity value; If the current sensitivity value of the gas detector is within the preset compensation range; This allows the zeroing value to be written to achieve sensitivity compensation for the drift sensitivity of the gas detector.

7. The remote maintenance control method for a gas detector according to claim 6, characterized in that, The step of issuing a compensation value to compensate for the drift sensitivity of the gas detector if the drift sensitivity of the gas detector is less than a preset sensitivity threshold also includes: If the current sensitivity value of the gas detector is not within the preset compensation range; Then, the value of zeroing the calibration is not allowed to be written, and the command execution result is reported to the cloud platform.

8. The remote maintenance control method for a gas detector according to claim 5, characterized in that, The process of controlling the gas detector to parse the cloud platform sensitivity compensation command includes: The cloud platform sensitivity compensation command includes historical sampling data, sensitivity threshold, and the adoption slope of the gas sampling value to be detected.

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