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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Catalog Number | 2104B2131 |
| Product Type | Medium Range Receiver (Searchline Excel) |
| Detection Technology | Open-path infrared |
| Path Length | Medium range: 40–120 m (130–390 ft) |
| Measurement Range | 0 to 5 LEL·m |
| Calibrated Gases | Methane, Ethylene (also supports Ethane, Propane, Butane, Pentane, Propylene, Ethanol, Methanol) |
| Recommended Alarm Setpoints | Low: 1.0 LEL·m; High: 3.0 LEL·m |
| Response Time (T90) | < 3 seconds (normal conditions) |
| Power Supply | 18–32 V DC |
| Power Consumption | Max approx. 10–13 W |
| Operating Temperature | –40 to +65 °C (–40 to +149 °F) |
| Humidity | 0–99 % RH non-condensing |
| Pressure | 91.5–105.5 kPa (non-compensated) |
| Hazardous Area Rating | Ex d IIC T6 / Ex II 2 G (ATEX/IECEx) |
| Weight, Approx. | 7 kg |
| Warm-up Time | < 5 min operational; < 1 hour fully stabilized |
4. Product Introduction
The Honeywell 2104B2131 is the medium-range receiver unit for the Searchline Excel open-path infrared gas detection system. It works with a matching transmitter to monitor a continuous beam path of 40–120 meters for combustible gases, primarily methane and ethylene.
The unit provides fast response (T90 under 3 seconds), high reliability in outdoor or hazardous locations, and is certified for use in Zone 1 / Division 1 equivalent environments. It is typically installed in oil & gas, petrochemical, and other facilities where open-path monitoring of large areas is required. The receiver outputs standard signals for connection to a control system or fire & gas panel.
2104B2131
2104B2131
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No power / no status | Supply voltage missing or out of range | ❌ Low | Measure 18–32 V DC at receiver terminals | Verify external power supply first |
| Beam not established | Misalignment or obstruction | ✅ High | Check optical path clear and transmitter/receiver aligned | Re-align using manufacturer alignment tools |
| High false alarms | Dirt on optics or environmental interference | ✅ High | Inspect and clean windows; check weather conditions | Clean optics; verify path is free of steam/dust |
| Slow or no response to gas | Calibration drift or wrong gas type | ✅ Medium | Confirm calibrated gas matches application | Perform functional test with test gas if available |
| Communication / signal loss | Wiring or output configuration error | ✅ Medium | Check analog/digital output wiring and scaling | Verify connection to control system |
| Unit overheating or fault LED | Exceeded ambient temperature or internal fault | ✅ Low | Confirm ambient within –40 to +65 °C | Improve ventilation or replace unit |
If the detector still does not function correctly after these checks, record the exact fault indications, path length, and environmental conditions, then contact technical support with photos of the installation.
6. Frequently Asked Questions (FAQ)
Q: What is the detection range of the 2104B2131?
A: It is a medium-range receiver designed for open-path lengths of 40–120 meters (approximately 130–390 feet).
Q: Which gases is it calibrated for?
A: Primarily methane and ethylene. The Searchline Excel platform also supports additional hydrocarbons including ethane, propane, butane, pentane, propylene, ethanol, and methanol.
Q: What power supply does it need?
A: A regulated 18–32 V DC supply. Maximum power draw is approximately 10–13 W.
Q: Is this unit suitable for hazardous areas?
A: Yes. It carries Ex d IIC and ATEX/IECEx certifications for use in Zone 1 / equivalent hazardous locations when installed according to the certificate.
Q: Does the 2104B2131 include the transmitter?
A: No. This is the receiver unit only. A matching Searchline Excel transmitter is required to complete the open-path system.
Q: What is the response time?
A: T90 is less than 3 seconds under normal operating conditions.
Q: Is the 2104B2131 still available as new?
A: New and new-surplus units are available through industrial suppliers, although lead times can be extended for factory-new stock.
