AOCH Downhole Combustible Gas (Methane) Concentration Remote Measurement Terminal
- Product description
- Technical specifications
- Product portfolio
-
- AOCH Downhole Combustible Gas (Methane) Concentration Remote Measurement Terminal
Measurement principle
This underground telemetry product integrates an explosion-proof laser methane sensor and supports self-powered wireless transmission. Its core sensor operates on the principle of laser‑based spectral absorption: a laser emits light at the characteristic methane absorption wavelength of 1653.7 nm, and methane molecules absorb this light, causing a reduction in optical intensity. A detector converts the attenuated optical signal into an electrical signal, and methane concentration is calculated using the Beer–Lambert law. The sensor offers high sensitivity, strong anti‑interference performance, and excellent stability, making it well suited for underground methane monitoring. When paired with a telemetry terminal, it provides an efficient and reliable solution for underground gas monitoring, ideal for hazardous methane‑rich environments.
This product can be used standalone or integrated with other AO-series downhole instruments, such as downhole telemetry devices for water level, flow rate, and water quality, enabling multi-parameter composite measurements. Please note: when integrated with other products, the battery life of the original device will be reduced.
Key Features
Monochromatic light generated by a DFB semiconductor laser (wavelength: 1653.7 nm, corresponding to the methane absorption peak);
The concentration range for methane explosions (the explosive limits) is expressed in vol% (volume percent).
Based on a predefined algorithm—such as second-harmonic detection—and in conjunction with the attenuation level, the methane concentration is calculated.
High sensitivity: capable of detecting concentrations at the ppm level, with accuracy superior to that of conventional catalytic combustion sensors.
The sensor is of the diffusion type.
During installation, ensure the sensor end is mounted vertically downward inside the manhole, at the lower section. For underground‑mounted dedicated antennas, when there is no signal on the top cover, they can be installed underground to provide seamless transmission.
Battery replacement is convenient, reducing O&M costs.
Compact in size, wall-mounted, and does not detract from the urban landscape.
Supports remote OTA;
All parameters support remote configuration.
Awards: Multiple patents and software copyrights.
◆ Application scenarios
In urban underground methane monitoring, this solution meets the demand for long-term, real-time surveillance in confined environments such as underground utility networks, sewer manholes, and gas pipelines. Equipped with a built-in long-life battery, it can sustain continuous monitoring for several years, while leveraging low-power wireless technology to transmit methane concentration data to a management platform. When concentrations exceed 5%–15% of the explosive limit, it issues immediate alerts, supporting rapid emergency response. Additionally, it can integrate sensors for water level, water quality, and other parameters, enabling multi‑parameter composite monitoring of “methane concentration plus environmental factors.” This intelligent, unmanned approach enhances the efficiency of municipal pipeline safety management, reduces risks associated with manual inspections, and is well suited for hazard prevention in municipal utilities, gas distribution, environmental protection, and related sectors.
Technical Specifications
Concentration range
0.08~20.00% Vol (volume concentration) Concentration resolution 0.01%Vol Basic error
±0.006%Vol (in the 0.08–1.00%Vol range), true value ±6% (in the 1.00–20.00%Vol range), Response time
Cold-start time: 14 seconds; single operating cycle: 20 seconds. Repeatability
Less than 2% Sensor power supply
6~26 VDC, typical value: 12 VDC, 16 mA Sensor signal
MODBUS.RTU-RS485 Material
Telemetry host: stainless steel; sensors: stainless steel + aluminum alloy Operating temperature
-10~70℃ Battery
Built-in lithium‑ion battery, non‑rechargeable, 133 Ah / 3.6 V DC, with a self‑discharge rate of no more than 5% per year; Refresh
Factory default: Measure once every 10 minutes and upload once; configurable. NB-IoT battery life
Under the 10-minute test-and-transfer operating condition: 4 years; under the 15-minute test-and-transfer operating condition: 6 years. 4G.cat1 battery life
Under the 10-minute test-and-transfer operating condition: 4 years; under the 15-minute test-and-transfer operating condition: 6 years. Wireless breakpoint resumption
When the base station signal is interrupted, data is automatically saved and, once the wireless signal is restored, the timestamped data is resent. Bluetooth (optional) BLE low power, version 5.1; range in open space: 150 meters; sensitivity: -90 dBm; transmit power: +6 dBm; standby current: 50 µA; battery life reduction: -2%
Message
Related Products
There is currently no relevant data available, please add it in the background!
HOW CAN WE HELP ?
Get In Touch With Us!
Contact Us
Address：
No.36, Longhui Road, Wujin National Hi-Tech Industrial Development Zone, Jiangsu Province, China
Address：
Building 5 and 11, Fuzhou IoT Industrial Park,
No. 12 Xingye West Road, Mawei District, Fuzhou City
Tel：
+86-13055728858
Email:
aotai03@fjautec.com Mr. Zhou
aotai01@fjautec.com Mr. Liao
aotai02@fjautec.com Mr. Zhang
aotai04@fjautec.com Mr. Chen
Email:
autec@163.com
Copyright © 2025 Fujian AUTEC Factory Automation Equipment Co., Ltd., All Rights Reserved.