1. Product Description

2104B2131 is an ATEX-certified medium-range infrared receiver source unit belonging to Honeywell Searchline Excel open path flammable gas detection system, manufactured by Honeywell Analytics UK. It works paired with a dedicated infrared transmitter to continuously detect hydrocarbon gas leakage across long-distance open areas.

Core Technical Specifications: 1. Detection Medium: All light hydrocarbons (Methane, Propane, Ethane, Ethanol, Methanol and other flammable VOCs) 2. Measuring Range: 0 ~ 5 LEL.m (Lower Explosive Limit per meter) 3. Medium Detection Path Length: 40m ~ 120m (130ft ~ 390ft) 4. Response Speed (T90): Less than 3 seconds under normal clean environmental conditions 5. Power Supply: 18VDC ~ 32VDC, max 10W power consumption 6. Signal Output: 4-20mA analog current signal + RS485 Modbus RTU digital communication 7. Operating Environment: -40°C ~ +65°C working temperature, 0~99%RH non-condensing humidity 8. Mechanical & Protection: 316 stainless steel housing, IP66/IP67 ingress protection rating 9. Safety Certifications: ATEX, IECEx, DNVGL marine hazardous zone approval 10. Weight: Approx. 7kg; Country of Origin: United Kingdom

2. Core Product Functions

• Infrared Beam Absorption Gas Measurement Receives xenon flash infrared light from the matched transmitter, calculates gas concentration by measuring infrared light absorption caused by hydrocarbon molecules along the optical path, providing linear LEL.m measurement data.
• ATEX Intrinsically Safe Hazardous Zone Operation Fully explosion-proof internal circuit and sealed stainless steel enclosure, eliminates ignition spark risks for Class I flammable gas & dust hazardous industrial areas.
• Dual Analog & Digital Signal Transmission Output standard 4-20mA analog signal for direct connection to DCS/PLC; Modbus RS485 digital bus supports multi-drop networking for centralized gas monitoring system.
• Automatic Environmental Compensation Algorithm Built-in temperature, humidity and atmospheric pressure compensation logic to eliminate measurement drift caused by weather and environmental changes.
• Self-Diagnosis & Fault Alarm Function Continuous monitoring of optical lens contamination, beam misalignment, power supply anomaly and internal circuit failure; outputs dedicated fault signal to control system for early maintenance reminder.
• Configurable Multi-Stage Gas Alarm Output Supports adjustable low/high gas concentration alarm thresholds (factory default:1.0 LEL.m low alarm,3.0 LEL.m high alarm) for safety interlock control of ventilation, shut-off valves and emergency shutdown systems.
• Long-Term Stable Optical Performance Anti-corrosion 316 stainless steel housing and sealed optical chamber prevent dust, oil mist and corrosive gas erosion, maintaining consistent measurement accuracy for years with minimal drift.
• Marine Offshore Environment Adaptation Compliant with DNVGL marine certification, resistant to salt spray, vibration and large temperature fluctuations for offshore platform and vessel hazardous compartment deployment.

3. Typical Application Scenarios

• Onshore & Offshore Oil & Gas Platforms Long-distance gas leakage monitoring for drilling decks, crude oil storage tank zones, natural gas compressor stations and pipeline valve manifolds.
• Chemical & Petrochemical Processing Plants Flammable VOC detection in reactor areas, distillation units, fuel loading docks and chemical raw material storage warehouses.
• LNG/LPG Terminals & Tanker Vessels Marine-certified gas detection for liquefied fuel cargo holds, pump rooms and offshore floating storage facilities.
• Power Generation Gas Turbine Stations Natural gas pipeline leakage monitoring around gas turbine fuel supply rooms and auxiliary gas storage areas.
• Wastewater & Biogas Treatment Facilities Methane biogas leakage detection in anaerobic digestion tanks and biogas pipeline distribution areas.
• Mining & Underground Gas Storage Facilities Long-path open area flammable gas monitoring for underground gas caverns and mine ventilation tunnels.
• Industrial Hazardous Zone Retrofit Safety Upgrade Replacement receiver unit for existing Honeywell Searchline Excel medium-range open path gas detection systems.

4. Common Faults & Troubleshooting Solutions

5. Import & Compliance Supporting Documents

1. Customs Documents: Certificate of Origin (COO), Factory Certificate of Conformity (COC), ATEX/IECEx Explosion-Proof Certification, DNV Marine Type Approval Certificate 2. Safety Files: SDS/MSDS for stainless steel housing, optical glass and electronic components 3. Technical Data: Official Searchline Excel datasheet, beam alignment installation drawing, factory gas calibration test report 4. HS Code: 90271000 Infrared Gas Analyzer Detector Equipment 5. Country of Origin: United Kingdom; Gross Weight: ~7kg 6. Lead Time: In stock 3~6 working days; OEM factory original order 12~16 weeks 7. Matching Spare Parts: Optical lens cleaning kit, ATEX sealing gasket set, mounting bracket, Modbus shielded signal cable, anti-vibration shock absorber