T: +86-577-59970799
E: wpt0125978@163.com
E: wpt0125978@163.com
No.17 Binhai 3rd Road, Yongxing Street, Longwan District, Wenzhou City, Zhejiang Province
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WEIDU
Natural gas is characterized by its flammability, explosiveness, and propensity to disperse. With gas pipelines distributed throughout cities, any leakage can easily lead to explosions. In particular, the large number of valve pits poses significant leakage risks and safety hazards. Manual inspections are often inefficient and untimely, making it essential to implement intelligent, IoT-based real-time monitoring for valve pits to enhance their safety.
The Underground Well Chamber Combustible Gas Monitoring Device (hereinafter referred to as the monitoring device) is independently developed by our company for monitoring gas leakage in underground well chambers. By utilizing various sensors to detect data such as gas concentration and pipeline pressure in valve pits, and combining with IoT technologies such as 4G/5G or NB-IoT, the device transmits 24-hour monitoring data from valve pits to an IoT monitoring platform. It provides real-time alerts and notifications in case of abnormalities, replacing traditional periodic manual inspections. This enables timely awareness of potential hazards, improves pipeline network safety management, and reduces labor costs.
This product complies with the standards GB/T 3836.1-2021 "Explosive Atmospheres – Part 1: General Requirements for Equipment"and GB/T 3836.4-2021" Explosive Atmospheres – Part 4: Equipment Protection by Intrinsic Safety 'i'". It carries the explosion-proof marking Ex ia IIB T4 Ga and is suitable for Zone 0, Zone 1, and Zone 2 areas containing explosive gas mixtures of groups IIA to IIB and temperature classes T1 to T4. The product has passed inspections by the National Center for Quality Supervision and Testing of Explosion-Proof Electrical Products and has obtained the explosion-proof certification.
Integrated with 4G/5G or NB-IoT wireless communication IoT modules, it enables seamless data interaction with remote IoT meter reading systems or gas pipeline SCADA systems, without communication distance limitations.
It periodically initiates connections to the server, allowing flexible configuration of sampling cycles and upload intervals. Using short connections, the device quickly enters sleep mode after each data exchange with the server, conserving power.
Monitoring data is uploaded via IoT based on timers, alarms, or manual triggers. Parameters such as pressure, temperature, concentration, power level, displacement, water level, and battery voltage are packaged and uploaded at adjustable intervals ranging from 1 minute to 24 hours. Real-time alarm notifications are provided, establishing a foundation for big data analysis of pipeline network operations.
With ultra-low power consumption design, the lithium battery can operate for up to 3 years under conditions of a 20-minute concentration sampling cycle, a 10-second pressure sampling cycle, and data reporting every 12 hours.
The device periodically detects combustible gas concentration. When an abnormal increase is detected (reaching the primary alarm threshold), it switches to rapid mode for real-time concentration monitoring. During this mode, the concentration sensor remains active, providing users with immediate data in exceptional situations for timely hazard awareness.
Equipped with a low-power pressure sensor, the device continuously monitors pipeline pressure, regularly logs pressure data, and uploads it to the system. This provides extensive pressure data to support safe pipeline operation and gas dispatch decisions.
Users can set alarm thresholds for pressure and temperature. When values exceed these thresholds, alarm information is immediately transmitted via IoT, ensuring timely alerts for pipeline safety.
A manhole cover detection travel switch is included to monitor the status of the cover in real time, reporting any changes in its open or closed state promptly.
A liquid level sensor is integrated to detect over-limit conditions. When the liquid level rises to a predefined height, a liquid level alarm is reported.
The device incorporates a Beidou positioning module. If displacement is detected, a displacement alarm is reported immediately.
It also supports remote firmware upgrades via IoT.
Example: WD-DG-KNY-A indicates a product equipped with manhole cover movement monitoring, liquid level monitoring, and pressure monitoring functions.
No. | Name | Parameters |
1 | Power Supply | Powered by 3.6 V Lithium Battery (ER34615-3) |
2 | Gas Measurement | CH4 |
3 | Concentration Sensor | Laser Methane Sensor |
4 | Methane Detection | Response time: ≤1 s |
5 | Detection Accuracy | Detection Accuracy ≤0.1% LEL |
6 | Detection Range | 0 ~ 100%LEL |
7 | Basic Error | ≤±3%LEL |
8 | Operating Temperature | -30 °C ~ +60 °C |
9 | Operating Humidity | 0% ~ 100% RH (non-condensing) |
10 | Explosion-proof Rating | Ex ia IIB T4 Ga |
11 | Protection Rating | IP68 (submersible in water up to 1 m/h) |
12 | Concentration Acquisition Cycle | Adjustable from 1 minute to 24 hours (default: 30 minutes), with real-time alarm notifications. |
13 | Pressure Acquisition Cycle | Adjustable from 5 seconds to 18 hours, default 20 seconds. |
14 | Display | LCD display |
15 | Pressure Range | 0-10 MPa selectable |
| 16 | Battery Service Life | Concentration sampling interval: 30 minutes; Pressure sampling interval: 20 seconds (default); Data upload frequency: every 12 hours; Battery service life: 5 years (may vary depending on actual usage conditions). |
① Monitoring Device ② Methane Sensor ③ Pressure Sensor ④ Antenna ⑤ LCD Display ⑥ Manhole Cover Limit Switch ⑦ Touch Key ⑧ Liquid Level Float Switch
6.1 Button Operation
The monitoring device uses touch-sensitive buttons. Pressing these buttons allows you to scroll through screens to display corresponding content. Meanwhile, a long press on different display interfaces triggers the device's corresponding functions.
Functions | Operating Instructions |
Button-triggered Reporting | On screens other than the Monitoring Device ID and Device Time interfaces, a long-press of the key initiates active reporting by the monitoring device. |
Enable Bluetooth | Press and hold the button on the monitor number interface to activate Bluetooth communication. |
Enter Fast Detection Mode | Press and hold the time interface to enter Rapid Concentration Detection Mode (if the device is in Sleep Mode, it will exit Sleep Mode simultaneously). The mode will automatically exit after 5 minutes. |
6.2 LCD Display
Key Presses | Display | Description | Key Presses | Display | Description |
1 |
| Display Gas Concentration Value | 7/8 |
| Display the first and last 5 digits of the device number |
2 |
| Display Pipeline Pressure Value (can show absolute or gauge pressure as configured, unit configurable as KPa or MPa) | 9 |
| Software version |
3 |
| Display Pipeline Temperature Value | Long- press Key 1 |
| On a non-device number interface, long-press the button to initiate a manual upload once. |
4 |
| Display Atmospheric Pressure Value | Long- press Key 2 |
| On the device number interface, long-press the button to enable Bluetooth communication. |
5 |
| Display Device Date | Long- press Key 3 |
| On the time interface, long-press the button to enter rapid concentration detection mode and exit sleep mode. The rapid concentration detection mode will automatically exit after 5 minutes. |
6 |
| Display Device Time | / |
6.3 Display Legend
Symbol | Description |
| If the pressure interface displays this symbol, it indicates that the current pressure reading is absolute pressure; otherwise, it is gauge pressure. |
| The IoT module indicator shows that it is connecting to the network. |
| Network connected. |
| The Bluetooth icon indicates that Bluetooth is enabled. |
| Battery Level Indicator. |
| Indicates that the device is in a fault state. |
| Indicates an alarm condition on the current device. |
Parameters can be configured via the mobile APP or remote server. Caution: When configuring via mobile phone, ensure environmental safety to prevent potential hazardous incidents.
No. | Parameter | Description | ||
1 | Upload Cycle | Upload Type | Month | indicates the frequency of uploads in days within a monthly cycle |
Day | indicates the frequency of uploads in hours within a daily cycle | |||
Hour | indicates the frequency of uploads in minutes within an hourly cycle | |||
Upload Interval | Upload at configured intervals based on the upload method. | |||
2 | IP Address | Set the IP address and port number of the remote server | ||
3 | Pressure Upload Type | Set gauge pressure or absolute pressure for data upload | ||
4 | Pressure Display Type | Set gauge pressure or absolute pressure for display | ||
5 | Pressure Display Unit | Set display unit as kPa or MPa | ||
6 | Pressure Acquisition Interval | Set interval from 1 to 65,535 seconds (default: 20 seconds) | ||
7 | High Pressure Alarm | Set pressure upper alarm threshold (unit: kPa) | ||
8 | Low Pressure Alarm | Set pressure lower alarm threshold (unit: kPa) | ||
9 | High Temperature Alarm | Set temperature upper alarm threshold | ||
10 | Low Temperature Alarm | Set temperature lower alarm threshold | ||
11 | Record Storage Interval | Set historical data freeze storage interval (minimum: 1 minute) and upload after packaging | ||
12 | Level 1 Leak Alarm | Set primary concentration alarm threshold (default: 10%) | ||
13 | Level 2 Leak Alarm | Set secondary concentration alarm threshold (default: 30%) | ||
14 | Concentration Detection Interval | Set CH₄ concentration detection interval (default: 30 minutes) | ||
15 | Rapid Detection Mode | Enable rapid detection mode under special circumstances for real-time CH₄ concentration monitoring within the set duration | ||
8.1 Overall Dimensions
8.2 Product Installation
Valve underground operations must first be strictly implemented in accordance with the user's valve chamber safe operating procedures. System management and installation/maintenance personnel shall receive professional training and qualification. Installation and maintenance personnel must possess knowledge of explosion-proof safety and shall operate in compliance with maintenance regulations and safe operating procedures. Before installation, a work plan for valve underground operations shall be submitted to the superior department for approval. Operations may only proceed after the application is approved. Prior to installation, an installation team shall be established with a minimum of 3 members per team.
Upon arriving at the installation site, first set up protective measures such as traffic cones.
Before entering the valve well, open the cover for ventilation and test the gas concentration inside in the following order: oxygen, combustible gas, and toxic/harmful gases. Entry is permitted only after the tests meet the required standards.
During installation operations inside the valve well, continuously monitor the levels of oxygen, combustible gas, and toxic/harmful gases. A dedicated supervisor must be present, and operators should work in shifts.
Operators shall use safety protection equipment and personal protective equipment correctly and maintain effective communication with the supervisor.
Operators must wear protective gear and fasten their safety harness before entering the well.
The monitoring device is set to sleep mode upon shipment. Activate the device before installation by touching the button and holding it on the time interface to exit sleep mode.
Select a firm and flat area on the underground well wall, as close to the well opening as possible (no more than 30 cm from the opening).
First, secure the mounting bracket to the back of the monitoring device using four M4*8 cross- recessed flat head screws. Then, drill a hole at the selected wall location with a Φ12 mm drill bit to a depth of at least 50 mm. Insert an M8 metal expansion bolt into the hole. Finally, align the hole on the mounting bracket with the plastic expansion plug and secure it to the well wall using one M8 nut.
Near the monitoring device head and close to the road surface, drill a hole and insert the antenna. Secure it with two 6 mm diameter plastic expansion tubes.
Install the pressure sensor (optional) at the pipeline pressure tap. After installation, check thoroughly for any gas leaks.
First, attach the well cover travel switch to the travel switch bracket using four 4*18 cross-recessed flat head screws. Then, fix the bracket to the well wall using two 6 mm diameter plastic expansion tubes. Ensure the gap faces upward and aligns level with the well cover.
The installation diagram is shown below:
After the monitoring device is installed and secured, verify that it is functioning properly.
Upon completion of the installation, the operator shall remove all equipment and tools from the valve chamber. The supervisor shall conduct a headcount and inventory to ensure no personnel or equipment remain inside the valve chamber before closing the chamber cover. After cleaning the site, remove thearea cordoning measures and evacuate the work zone.
8.3 Installation Precautions
Users shall observe the following precautions during installation: The installation, use, and maintenance of the monitoring device must also comply with the relevant provisions of the national standards listed below:
GB/T 3836.13-2021 Explosive atmospheres – Part 13: Equipment repair, overhaul, reclamation, and modification
GB/T 3836.15-2017 Explosive atmospheres – Part 15: Design, selection, and installation of electrical installations
GB/T3836.16-2017 Explosive atmospheres – Part 16: Inspection and maintenance of electricalinstallations
GB 50257-2014 Code for construction and acceptance of electrical installation engineering inexplosive and fire hazardous atmospheres
◆ Prevent the device from coming into contact with corrosive or overheated media.
◆ Before installation, ensure that the actual pipeline pressure falls within the pressure sensor's measurement range.
◆ When used in flammable gas environments, do not replace components or modify the structure, as this may compromise explosion-proof performance.
◆ Unauthorized disassembly or modification of the instrument is strictly prohibited.
◆ If battery replacement is required, use only the specified battery manufacturer and model. In hazardous locations, confirm safety conditions before opening the battery compartment. Replace batteries only in well-ventilated areas with no gas leakage, using the same battery model provided by our company.
◆ When used in flammable or explosive environments such as those containing combustible gases, installation must comply with GB/T 3836.15-2017 "Explosive atmospheres – Part 15: Design, selection and erection of electrical installations." The explosion-proof marking is Ex ia IIB T4 Ga.
◆ Warning Label: Potential electrostatic hazard. To avoid ignition risks caused by electrostatic discharge during normal use, maintenance, or cleaning, do not touch or wipe the device when used in explosive atmospheres. If wiping or contact is necessary, perform the operation in a well- ventilated area with no gas leakage. Use a damp cloth to clean the housing, and avoid using a dry cloth.
One-Year Warranty (During the warranty period, the"Three Guarantees"policy applies). Lifetime Maintenance (Coverage for the entire service life of the IoT valve well gas monitoring device.)
Avoid severe impact during transportation and handling. The product must be transported and stored in its original packaging and placed on a support structure. It should be stored in an area free from vibration, impact, and rain, in a clean and dry environment. The ambient temperature should be between -30 °C and +60 °C, with relative humidity not exceeding 90%. The air must not contain corrosive or harmful substances.
Before opening the package, please check the integrity of the external packaging. Verify the contents and accompanying documents against the packing list to ensure completeness.
Accompanying Documents
Packing List
User Manual
Certificate of Complianc
