350800-01-180 is a core model of the Bently Nevada 350800 series, serving as an intrinsically safe hazardous gas detection sensor, suitable for high-risk industrial scenarios such as petrochemical, power, metallurgy and other industries. It detects target gas concentrations via dedicated sensing elements and outputs a standard 4–20mA signal to connect to the 3500 monitoring frame, enabling continuous monitoring, multi-level alarms and system interlock. It meets ATEX, IECEx and other explosion-proof certification requirements to ensure operational safety in hazardous areas.
Core Technical Parameters
- Detection Principle: Catalytic combustion (combustible gases) / Electrochemical (toxic gases)
- Explosion-proof Grade: Ex ia IIC T4 (Intrinsically Safe)
- Ingress Protection: IP65 (dustproof and waterproof)
- Operating Temperature: -20°C ～ +50°C
- Power Supply: 24V DC compatible with 3500 system
- Output Signal: 4–20mA (2-wire)
- Response Time: ≤30 seconds (T90)
- Accuracy: ±5% FS
- Alarm Mode: Two-stage threshold alarm (triggers sound-light / remote alarm via 3500 system)
Functions & Applications
Core Functions
- Continuously monitors concentrations of combustible gases (methane, propane, etc.) or toxic gases (H₂S, CO, etc.)
- Uploads real-time data to the 3500 monitoring system, supporting historical recording and trend analysis
- Programmable multi-level alarm thresholds; triggers system protection actions (e.g., cutting off gas supply, activating fans) when exceeding limits
- Self-diagnosis of sensor faults to reduce maintenance risks
Typical Applications
- Oil refineries, natural gas processing plants, LNG terminals
- Thermal / gas-fired power plants, chemical reaction zones, storage tank areas
- Underground coal mines, metallurgical plants, pharmaceutical plants and other enclosed / semi-enclosed spaces at risk of gas leakage
Recommended Bently Models
The 350800 series is classified by gas type, installation method and certification level, with main models as follows:
- 350800-01-180: Basic type, universal for combustible / toxic gases, intrinsically safe, standard installation
- 350800-02-180: Enhanced type, high sensitivity, suitable for low-concentration gas monitoring
- 350800-01-200: High-temperature type, operating temperature -40°C ～ +60°C, suitable for extreme working conditions
- 350800-03-180: Multi-gas composite detection type, monitors 2–3 target gases simultaneously
- 350800-01-180-EX: Dual ATEX / IECEx certification, compliant with EU / international explosion-proof standards
- 350800-01-180-CN: Domestic explosion-proof certification (Ex ia IIC T4), suitable for the Chinese market
System Compatibility
- Fully compatible with Bently Nevada 3500 series monitoring frames (3500/05, 3500/15, 3500/20, etc.)
- Supports cooperative operation with vibration, displacement and temperature monitoring modules of the 3500 system to build an integrated equipment safety monitoring network
- Can be connected to DCS, PLC and other host systems via communication modules of the 3500 system (e.g., 3500/22M)
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