The Fixed Single Gas Detector is a reliable industrial gas monitoring device designed for continuous detection of combustible gases, toxic gases, or oxygen concentration in hazardous environments.
Equipped with advanced gas sensing technology, the detector offers fast response, high accuracy, and stable performance. It supports 4–20mA analog signal output and RS485 communication (Modbus RTU), allowing seamless integration with gas alarm controllers, PLC systems, or computer monitoring software for real-time monitoring and data management.
The device is widely used in industries such as petroleum, chemical processing, natural gas, metallurgy, power generation, environmental monitoring, and industrial safety systems.
Key Features
Explosion-proof, lightning-proof, anti-static, and reverse polarity protection design
Strong resistance to EMI / EMC electromagnetic interference
Surge and pulse current protection
Complies with GB15322.1-2019 and GB3868.2-2000 standards
Certified with CPA measuring instrument approval and explosion-proof certification
Standard three-wire 4–20mA signal output
Supports RS485 bus communication (Modbus RTU protocol)
Two relay output contacts available
Optional voltage signal output
Supports PC connection for real-time monitoring, data storage, analysis, and printing
Automatic zero tracking calibration to prevent sensor drift
Supports OEM and ODM customization
Detection Method
Standard: Diffusion type sampling
Optional: Pipeline type / Flow-through type / Pump suction type
Detectable Gases
The detector can be configured to detect various gases, including but not limited to:
Combustible gases (Ex)
Methane (CH₄)
Propane (C₃H₈)
Carbon Monoxide (CO)
Hydrogen Sulfide (H₂S)
Oxygen (O₂)
Optional infrared gas detection technology is available.
More than 500 gases can be configured upon request.
Technical Specifications
| Parameter | Specification |
| Target Gas | Single gas |
| Detection Range | 0–100%LEL, 100%Vol (customizable ranges available) |
| Resolution | 0.1%LEL, 0.01%Vol |
| Typical Accuracy | ±3% F.S |
| Sampling Method | Diffusion type; optional pipeline, flow-through, or pump suction |
| Display | Standard |
| Power Supply | DC 24V |
| Max Power Consumption | Standard |
| Operating Temperature | Typical: -20°C to +55°C |
| Extreme Temperature | -40°C to +70°C |
| Humidity | 10–95% RH |
| Data Storage | Not available |
| Printing | Not supported |
| Signal Output | RS485 (Modbus RTU), 4–20mA (three-wire) |
| Alarm Method | Audible & visual alarm; 1–2 relay outputs |
| Wireless Transmission | Not supported |
| Protection Rating | IP65 |
| Dimensions | 230×180×60 mm or 230×230×60 mm (with alarm light) |
| Weight | 1.2 kg (without alarm light), 1.4 kg (with alarm light) |
Standard Accessories
User Manual
Certificate of Conformity
Warranty Card
Packaging Box
Optional Accessories
Integrated audible & visual alarm
Split-type audible & visual alarm
24V DC regulated power supply
PC monitoring accessories:
Host computer software
RS485 / RS232 converter
USB / RS232 conversion cable
TCP/IP converter
Applications
Petroleum and petrochemical plants
Natural gas distribution systems
Chemical production facilities
Metallurgy and energy industries
Environmental monitoring systems
Industrial safety monitoring
Warehouses and confined space gas detection
