A gas leak monitoring terminal and system

Abstract

This invention belongs to the field of gas leak monitoring, specifically relating to a gas leak monitoring terminal and system. The monitoring terminal features a special design capable of promptly detecting damage and malfunctions. It includes a linked level for vibration / displacement warnings and upward / downward extension probes, a camera for recording environmental conditions, monitoring terminal equipment issues, and the maintenance process, and indicator lights for on-site observation of terminal equipment malfunctions. These features ensure the normal monitoring status of the terminal and improve the reliability of monitoring results. Furthermore, the monitoring system, through the cooperation of a cloud platform and the terminal, enables the setting and modification of terminal parameters via both on-site configuration using an infrared receiver and remote configuration via a communication module. It also allows for the detection, fault diagnosis, and corresponding alarms for various parameters characterizing the operating conditions of gas valve wells and valve chambers, ensuring effective monitoring.

Description

Technical Field

[0001] This invention belongs to the field of gas leak monitoring, specifically relating to a gas leak monitoring terminal and system. Background Technology

[0002] Gas valve wells and chambers are important components of gas transmission and distribution networks, forming a confined, enclosed space. Leak monitoring of valve wells and chambers is a crucial part of the gas industry's information-based safety construction. Due to the enclosed, dark, and damp environment of valve wells and chambers, which is highly corrosive to pipeline components, the risk and hazards of gas leaks are significant. Methods relying on manual inspections or monitoring based on upstream and downstream flow differences suffer from high manpower requirements, heavy workload, inaccurate monitoring, low timeliness, and inconsistent monitoring cycles.

[0003] Existing terminal equipment and systems for monitoring gas leaks primarily rely on sensors to collect real-time environmental data and issue alarms when data anomalies occur, thus enabling leak monitoring of valve wells and chambers. However, the environmental conditions in gas valve wells and chambers can be quite complex under actual operating conditions, and the gas leak monitoring terminals themselves are easily affected by the environment. Furthermore, due to the relatively remote and enclosed locations of valve wells and chambers, damage caused by human intervention or other external forces is difficult to detect in a timely manner. Such damage can affect normal data monitoring, potentially leading to discontinuous or inaccurate data and unreliable monitoring results. Summary of the Invention

[0004] The purpose of this invention is to provide a gas leak monitoring terminal and system to solve the problem in the prior art that it is difficult to detect the damage to the monitoring terminal in a timely manner, resulting in unreliable monitoring results.

[0005] To achieve the above objectives, the present invention provides a gas leak monitoring terminal, including a housing, a main board, and a data acquisition module connected to the main board, and further including an upward extension probe and a downward extension probe; the main board includes a communication module, a data acquisition and processing module, and a control module;

[0006] The acquisition module includes a combustible gas sensor, a first level, and a second level.

[0007] The first level is located on the upper side inside or outside the housing, with an upward extension probe extending to the top manhole cover. It is used to detect vibration or displacement at the upper end of the intelligent gas leak monitoring terminal and issue corresponding alarms, and also to monitor the opening and closing of the manhole cover. The second level is located on the lower side inside or outside the housing, with a downward extension probe extending to the bottom pipe. It is used to detect vibration or displacement at the lower end of the intelligent gas leak monitoring terminal and issue corresponding alarms.

[0008] The gas leak monitoring terminal of the present invention includes a level that is linked to provide vibration / deviation warnings and upward and downward extension probes. Therefore, it can promptly detect and warn of potential damage to the monitoring terminal, ensuring that damaged monitoring terminals can be maintained in a timely manner and improving the reliability of monitoring results.

[0009] Furthermore, a camera is mounted on the housing to record the passage of people or objects, as well as to record equipment malfunctions and abnormal environmental conditions; the camera activates when any of the following conditions are met:

[0010] 1) The water level exceeded the set threshold for the downward extension probe;

[0011] 2) Any level's offset angle exceeds the set angle threshold;

[0012] 3) It should be activated proactively when personnel enter for maintenance.

[0013] This camera can record the environment, monitor terminal equipment problems and maintenance processes in a timely manner, and can indirectly reflect the possible causes of failures in the monitoring terminal.

[0014] Furthermore, the motherboard also includes indicator lights, which are located on the outer surface of the housing and controlled by the control module to check the device status; when the device malfunctions, the indicator lights are controlled to change.

[0015] The indicator lights allow for a direct and intuitive observation of equipment malfunctions at the monitoring terminal. This method of directly indicating malfunctions is simple and clear, making it easy to detect equipment failures in the relatively dim working environment of gas leak monitoring terminals.

[0016] Furthermore, to monitor indoor water accumulation, the acquisition module also includes a liquid level sensor, which is connected to the data acquisition and processing module of the motherboard and is used to send the acquired liquid level monitoring data to the data acquisition and processing module of the motherboard.

[0017] Furthermore, to facilitate on-site parameter setting of the motherboard, the motherboard also includes an infrared receiver; the infrared receiver is used to receive parameter configuration signals from the infrared remote control; the control module is also used to demodulate the parameter configuration signals and set on-site parameters of the motherboard.

[0018] Furthermore, the upward extension probe and the downward extension probe are retractable probes.

[0019] Furthermore, to improve the monitoring terminal's ability to receive information, an extension antenna is connected inside the upward extension probe, and the extension antenna is used to enhance the communication signal of the monitoring terminal.

[0020] Furthermore, the motherboard also includes a human-machine interaction module, which is communicatively connected to the infrared receiver and the control module. The human-machine interaction module is used to display the configuration options corresponding to the infrared receiver and the control module, thereby enabling on-site human-machine interaction.

[0021] Furthermore, the communication module is also used to transmit the parameter configuration commands of the cloud system platform to the control module for remote parameter setting of the motherboard.

[0022] The present invention also provides a gas leak monitoring system, including a cloud system platform and a gas leak monitoring terminal;

[0023] The cloud system platform is used to send cloud platform parameter configuration commands to the gas leak monitoring terminal, control the gas leak monitoring terminal to remotely set parameters, and also to receive combustible gas concentration monitoring data and liquid level monitoring data obtained by the gas leak monitoring terminal and compare them with the corresponding set alarm thresholds, and respectively issue alarms for excessively high gas concentration and excessively high liquid level.

[0024] The gas leak monitoring terminal is the gas leak monitoring terminal described above.

[0025] In this system, the terminal and the cloud platform can communicate bidirectionally. The terminal can not only upload monitoring data collected by the terminal to the cloud for alarm purposes, but also receive parameter configuration commands from the cloud platform. These commands are transmitted to the microcontroller via the communication module, and after signal processing, the terminal parameters are modified. Simultaneously, the gas leak monitoring terminal can also independently implement corresponding alarm functions using its own control module.

[0026] In the gas leak monitoring system of the present invention, the gas leak monitoring terminal can achieve the same beneficial effects as the gas leak monitoring terminal described above. Moreover, the entire system can set and change the terminal parameters through two methods: on-site configuration via infrared receiver and remote configuration via communication module. It can also detect, diagnose, and alarm for various parameters characterizing the working conditions of gas valve wells and valve chambers, thereby improving the monitoring effect. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the front structure of the motherboard in an embodiment of the gas leak monitoring terminal of the present invention;

[0028] Figure 2 This is a schematic diagram of the back structure of the motherboard in an embodiment of the gas leak monitoring terminal of the present invention;

[0029] Figure 3 This is the overall external structure of the gas leak monitoring terminal in the embodiment of the present invention;

[0030] Figure 4This is a schematic diagram showing the positions of the upward and downward extension probes of the gas leak monitoring terminal in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram illustrating the actual connection method of the upward and downward extension probes of the gas leak monitoring terminal in an embodiment of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0033] Example of a gas leak monitoring terminal:

[0034] This embodiment provides a technical solution for a gas leak monitoring terminal, which includes a housing, a motherboard, and a data acquisition module connected to the motherboard, as well as an upward extension probe and a downward extension probe.

[0035] Reference Figure 1 and Figure 2 ,in Figure 1 This is a schematic diagram of the front of the motherboard (here, "front" refers to the side facing the same direction as the outer side of the casing). Figure 2 This is a schematic diagram of the back of the motherboard (the back refers to the side facing the same direction as the inner side of the casing).

[0036] The motherboard mainly includes a communication module, a data acquisition and processing module, and a control module (the data acquisition and processing module is not shown in the figure but is integrated within the motherboard). The communication module can immediately upload the monitoring data acquired by the motherboard to the cloud system platform when the monitored data exceeds the corresponding set alarm threshold. It can also transmit parameter configuration commands from the cloud system platform to the control module of the motherboard for remote parameter setting. The communication module adopts both NB-IoT and CAT.1 IoT communication technologies, supporting two communication frequency bands and 2G and 4G communication signal modes. Compared with the single-signal method of similar products on the market, it has better communication stability and monitoring data continuity. In this embodiment, the control module uses a CPU microcontroller, and the communication module is also implemented through this microcontroller; in other embodiments, other controllers that can be used as CPUs can also be used.

[0037] In this embodiment, the data acquisition and processing module can also be used to periodically acquire data according to a set acquisition cycle and periodically upload data to the cloud system platform according to a set upload cycle.

[0038] In this embodiment, the motherboard also includes an infrared receiver for receiving parameter configuration signals from the infrared remote control. The infrared remote control can be manually controlled at the gas leak monitoring terminal's working site. Correspondingly, the control module can also be used to demodulate the parameter configuration signals and set parameters on the motherboard on-site. The motherboard can also be equipped with a human-machine interface module. In this embodiment, the human-machine interface module is an LCD screen. Through the infrared remote control, infrared receiver, and control module, combined with the LCD screen's option display function, on-site human-machine interaction can be achieved, thereby enabling parameter settings such as zero-point calibration, sensitivity calibration, and high / low limit alarm values.

[0039] The motherboard also includes indicator lights, which are located on the outer surface of the housing and controlled by the control module to view the device status. When a device malfunctions, the indicator lights change accordingly. In this embodiment, to ensure more comprehensive indication functions, the motherboard can include three types of indicator lights: green, red, and yellow. These indicator lights are all located outside the housing and controlled by the control module to view alarm conditions and / or device status. Typically, high-brightness LEDs are used for the indicator lights, with status indications as follows: green - normal, red - environmental alarm, and yellow - device malfunction. For example, when the gas concentration or liquid level is below a set alarm threshold, the green light illuminates; when the gas concentration or liquid level is greater than or equal to the set alarm threshold, the red light illuminates; and when the device experiences malfunctions such as low battery voltage, communication interruption, or sensor disconnection or damage, the yellow light illuminates. By observing the indicator lights, especially the yellow light indicating device status, the current environment and device status can be visually observed at the terminal. Furthermore, the method of directly indicating malfunctions through indicator lights is simple and clear, facilitating the detection of device malfunctions in the relatively dim working environment of the gas leak monitoring terminal. In other embodiments, the device status can also be indicated by other indicator light changes, as long as the indicator light status can clearly distinguish between normal and fault conditions, such as the indicator light changing from solid to flashing or from solid to off when the device is faulty.

[0040] The data acquisition module typically includes a combustible gas sensor for detecting combustible gas concentration. To prevent indoor water accumulation, the module also includes a liquid level sensor, which is connected to the motherboard's data acquisition and processing module to send the collected liquid level monitoring data to the motherboard's data acquisition and processing module. Both the combustible gas sensor and the liquid level sensor can be ultra-low power infrared sensors or CXH-3 ultra-low power sensors, offering low power consumption, resistance to silicon and hydrogen sulfide poisoning, and higher accuracy and reliability. The sensor module is replaceable in real-time for easy maintenance. Both the combustible gas sensor and the liquid level sensor are connected to the motherboard's data acquisition and processing module, respectively sending the collected combustible gas concentration monitoring data and liquid level monitoring data to the motherboard's data acquisition and processing module. When the monitored data exceeds the corresponding set alarm threshold, the motherboard immediately uploads the monitoring data to the cloud system platform via the communication module.

[0041] The data acquisition module also includes a first level and a second level. The first level is located on the upper side inside the housing, with an upward-extending probe extending to the top manhole cover. This probe is used to detect vibration or displacement at the upper end of the intelligent gas leak monitoring terminal and trigger corresponding alarms. The second level is located on the lower side inside or outside the housing, with a downward-extending probe extending to the bottom pipe. This probe is used to detect vibration or displacement at the lower end of the intelligent gas leak monitoring terminal and trigger corresponding alarms. Vibration is a discontinuous signal, and the values ​​of the two levels are inconsistent. Displacement is a continuous signal, and the values ​​of the two levels are consistent. Based on these different signal characteristics, the system distinguishes between vibration and displacement conditions. Figure 4 and Figure 5 As shown, the upper contact point on the upward extension probe of the first level instrument contacts the manhole cover and is linked to the ground. If there is any damage to the hardened ground near the terminal, the level instrument will vibrate violently and continuously. If the vibration exceeds a certain time, a construction damage warning will be issued. The specific method of monitoring the opening and closing of the manhole cover through the first level instrument is as follows: after the manhole cover presses down on the upper probe, the top probe of the first level instrument changes its tilt angle (i.e., offset), which is set to the initial position; after the manhole cover is moved away, the tilt angle of the upper probe of the first level instrument changes again, which is the changed position, and it is determined that the manhole cover is open; when the probe returns to the initial position, it is determined that the manhole cover is closed; if the first level instrument changes continuously, such as the tilt angle of the probe changing repeatedly between the initial position and the changed position, it is also determined to be a construction damage warning.

[0042] The lower contact point on the downward-extending probe corresponding to the second level instrument contacts the bottom pipe of the well. Similar to the first level instrument, it determines lower-end vibration or displacement, triggering a pipe damage or high-flow warning. In this embodiment, the level instrument is integrated into the electronic board within the housing. When vibration occurs, the level instrument transmits a signal to the control module (microcontroller). The microcontroller's internal program judges the signal and transmits the result to the platform, or the microcontroller directly transmits the signal to the platform. The platform alarms when the vibration exceeds a set frequency or time threshold. In other embodiments, an alarm can be triggered immediately upon detecting vibration. The aforementioned level instrument, linked to the monitoring position and capable of vibration / displacement warning, along with the upward and downward extending probes, can promptly detect and warn of potential damage to the monitoring terminal, ensuring timely maintenance of any damaged monitoring terminal and improving the reliability of monitoring results. The two independent level instruments, combined with the upward and downward extending probes, meet the national standards for explosion-proof registration and certification, such as Ex ib IIC T4 Gb. In other embodiments, the level instrument can be replaced with an external vibration module and a top displacement module, but this lacks overall integration and requires additional explosion-proof sensors.

[0043] The upward-extending probe can also be equipped with an extension antenna, which can enhance the communication signal of the IoT card in the monitoring terminal, thereby effectively increasing the signal reception capability of the monitoring terminal. The acquisition module also includes a liquid level sensor, and the downward-extending probe is a metal housing, inside which the liquid level sensor is connected. In this embodiment, as shown... Figure 4 and Figure 5 As shown, a liquid level sensor is mounted on a downward extension probe. A movable float is located at the set position of the lower screw of the liquid level sensor. In this embodiment, the movable float is set at 80% of the height of the downward extension probe from bottom to top. When the liquid level rises, the float moves, and the liquid level sensor issues a liquid level warning signal, indicating that the water level is about to submerge the equipment. This is used to monitor and warn of water accumulation in the well, thereby protecting the equipment. In a preferred embodiment, both the upward and downward extension probes are retractable probes. Retractable probes allow the product to be designed with explosion-proof features in mind, and since the conditions of gas valve wells are not uniform, retractable probes can be adapted to different scenarios.

[0044] The monitoring terminal's housing can be made of sealed carbon steel with an overall IP67 waterproof design, suitable for humid and water-prone underground environments. The battery, control module, communication module, data acquisition and processing module circuits and related components are all located inside the housing, preventing the terminal's internal electronic components and wiring from being affected by the underground environment. A 360° camera can be installed on the housing to record the passage of personnel or objects, as well as equipment malfunctions and environmental anomalies; this camera activates when any of the following conditions are met:

[0045] 1) The water level has exceeded the set percentage threshold for the downward extension probe; In this embodiment, the camera can be activated when the liquid level sensor of the downward extension probe issues a liquid level warning signal, i.e., the set percentage threshold is 80%.

[0046] 2) Any level's offset angle is greater than the set angle threshold; In this embodiment, the camera is activated when the level determines that the manhole cover is open;

[0047] 3) It is activated when personnel enter for maintenance, and is used to record the operation process and for project management.

[0048] This camera can record the environment, monitor terminal equipment problems and maintenance processes in a timely manner, and can indirectly reflect the possible causes of failures in the monitoring terminal. Therefore, the data recorded by the camera can also be used for equipment failure or environmental anomaly analysis.

[0049] Figure 3 The diagram shows the overall external structure of a gas leak monitoring terminal. The terminal consists of a housing, motherboard, battery (not shown in the diagram), antenna, two probes, a 360° camera, a combustible gas sensor (i.e., a leak sensor), and a liquid level sensor. Only the corresponding interfaces of the antenna and liquid level sensor are shown. Figure 1-3 In addition to the above, the motherboard mainly integrates: a control module (i.e., a microcontroller), a communication module, an infrared receiver, a magnetic rod sensor, a data acquisition and processing module, a liquid level sensor interface, a combustible gas sensor (i.e., a leak sensor), a battery interface, an LCD screen, and LED lights, etc. The magnetic rod sensor is used to monitor the open / closed state of the equipment enclosure, which refers to the housing of this monitoring terminal. When the housing is open, the feedback circuit corresponding to the magnetic rod sensor is in an open state; when the housing is closed, the feedback circuit is in a closed state, thereby determining whether the housing is open or closed. In other embodiments, the motherboard may also include a power conversion module, an infrared sensor interface, and a RS-485 communication port.

[0050] Example of a gas leak detection system:

[0051] This embodiment proposes a technical solution for a gas leak monitoring system, which includes a cloud system platform and a gas leak monitoring terminal.

[0052] Among them, the cloud system platform is used to send cloud platform parameter configuration commands to the gas leak monitoring terminal, control the gas leak monitoring terminal to remotely set parameters, and also to receive combustible gas concentration monitoring data and liquid level monitoring data obtained by the gas leak monitoring terminal and compare them with the corresponding set alarm thresholds, and respectively judge and alarm for excessive gas concentration value and excessive liquid level value.

[0053] The specific composition and functions of the gas leak monitoring terminal have been described in detail in the above embodiments of the gas leak monitoring terminal, and will not be repeated here.

[0054] The gas leak monitoring terminal can achieve two-way communication with the cloud platform. The terminal can not only upload monitoring data but also receive parameter configuration commands from the cloud platform. These commands are transmitted to the microcontroller via the communication module, and after signal processing, terminal parameters can be remotely changed / configured. The gas leak monitoring terminal supports remote configuration of parameters such as device transmission frequency and alarm thresholds via the cloud system platform, greatly facilitating equipment maintenance and management.

[0055] In other embodiments, the gas leak monitoring terminal can upload more types of on-site detection data to the cloud system platform, including terminal battery power information, and can also receive data from other monitoring systems and provide data to other monitoring systems. Through a centralized cloud system platform, multi-region, multi-system centralized management is achieved, offering advantages in centralized dispatch, saving manpower costs, and improving emergency response efficiency. The terminal can be configured to collect data periodically and upload data according to the upload cycle. When the concentration of combustible gas, liquid level, etc., reaches the set warning value, the collecting terminal immediately reports the data, and the cloud system platform's computer immediately generates a pop-up window and voice alarm, and can push the alarm to the corresponding APP on the cloud system platform. The cloud system platform employs hierarchical monitoring and authorized management, ensuring high security.

[0056] The gas leak monitoring terminal and system of this invention are characterized by a special design that enables timely detection of terminal damage and malfunctions, as well as the interaction between the cloud system platform and the terminal. The terminal includes a linked level for monitoring terminal vibration / deviation early warning and upward / downward extension probes, a camera for timely recording of the environment, monitoring terminal equipment problems and maintenance processes, and indicator lights for on-site observation of terminal equipment malfunctions. These features ensure the normal detection status of the monitoring terminal from multiple aspects, improving the reliability of monitoring results. The cooperation between the cloud system platform and the terminal enables the setting and modification of terminal parameters through both on-site configuration via infrared receiver and remote configuration via communication module. It also enables the detection, fault diagnosis, and corresponding alarms for various parameters characterizing the operating conditions of gas valve wells and valve chambers, ensuring monitoring effectiveness.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A gas leak monitoring terminal, comprising a housing, a main board, and a data acquisition module connected to the main board, characterized in that, It also includes upward extension probes and downward extension probes; the motherboard includes a communication module, a data acquisition and processing module, and a control module; The acquisition module includes a combustible gas sensor, a first level, and a second level. The first level is located on the upper inner or outer side of the housing, with an upward-extending probe extending to the top manhole cover. It is used to detect vibration or displacement at the upper end of the intelligent gas leak monitoring terminal and issue corresponding alarms, as well as to monitor the opening and closing of the manhole cover. The second level is located on the lower inner or outer side of the housing, with a downward-extending probe extending to the bottom pipe. It is used to detect vibration or displacement at the lower end of the intelligent gas leak monitoring terminal and issue corresponding alarms. Vibration is indicated by an intermittent signal, and the values ​​of the upper and lower levels are inconsistent. Displacement is indicated by a continuous signal, and the values ​​of the upper and lower levels are consistent. Based on these different signal characteristics, vibration and displacement conditions are distinguished. The upper contact point on the upward-extending probe is used to contact the manhole cover and is linked with the ground. If the vibration of the first level exceeds a certain time, a construction damage warning will be issued. If the tilt angle of the upper contact point on the upward extension probe changes repeatedly between the initial position and the changed position, it is also judged as a construction damage warning. The initial position and the changed position refer to the change in the inclination angle of the upper contact point after the manhole cover presses down on it and after the manhole cover is removed.

2. The gas leak monitoring terminal according to claim 1, characterized in that, A camera is mounted on the housing to record the passage of people or objects, and also to record equipment malfunctions and abnormal environmental conditions; the camera activates when any of the following conditions are met: 1) The water level exceeded the set threshold for the downward extension probe; 2) Any level's offset angle exceeds the set angle threshold; 3) It should be activated proactively when personnel enter for maintenance.

3. The gas leak monitoring terminal according to claim 1, characterized in that, The motherboard also includes indicator lights, which are located on the outer surface of the housing and controlled by the control module to check the device status; when the device malfunctions, the indicator lights are controlled to change.

4. The gas leak monitoring terminal according to any one of claims 1-3, characterized in that, The acquisition module also includes a liquid level sensor, which is connected to the data acquisition and processing module of the motherboard and is used to send the acquired liquid level monitoring data to the data acquisition and processing module of the motherboard.

5. The gas leak monitoring terminal according to any one of claims 1-3, characterized in that, The motherboard also includes an infrared receiver; the infrared receiver is used to receive parameter configuration signals from the infrared remote control; the control module is also used to demodulate the parameter configuration signals and set the parameters of the motherboard on-site.

6. The gas leak monitoring terminal according to any one of claims 1-3, characterized in that, The upward and downward extension probes are retractable probes.

7. The gas leak monitoring terminal according to any one of claims 1-3, characterized in that, An extension antenna is connected inside the upward extension probe, and the extension antenna is used to enhance the communication signal of the monitoring terminal.

8. The gas leak monitoring terminal according to claim 5, characterized in that, The motherboard also includes a human-machine interaction module, which is communicatively connected to the infrared receiver and the control module. The human-machine interaction module is used to display the configuration options corresponding to the infrared receiver and the control module, so as to realize on-site human-machine interaction.

9. The gas leak monitoring terminal according to any one of claims 1-3, characterized in that, The communication module is also used to transmit parameter configuration commands from the cloud system platform to the control module for remote parameter setting of the motherboard.

10. A gas leak detection system, characterized in that, This includes cloud system platforms and gas leak monitoring terminals; The cloud system platform is used to send parameter configuration commands to the gas leak monitoring terminal, control the gas leak monitoring terminal to remotely set parameters, and also to receive combustible gas concentration monitoring data and liquid level monitoring data obtained by the gas leak monitoring terminal and compare them with the corresponding set alarm thresholds, and respectively issue alarms for excessively high gas concentration and excessively high liquid level. The gas leak monitoring terminal is the gas leak monitoring terminal described in any one of claims 1-9.

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