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- Honeywell
- 2104B2131
- Mid-Range Receiver
- USA
- 353 × 417 × 300 mm
- 7 kg
- Xiamen, China
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Product Overview
The Honeywell 2104B2131 Medium-Range Receiver is an ATEX-certified open-path infrared (IR) gas detection receiver used in Honeywell Searchline Excel gas detection systems. It works in combination with a matching transmitter to form a complete gas monitoring path for detecting flammable hydrocarbon gas clouds over medium distances.
It is designed for hazardous industrial environments such as refineries, offshore platforms, and petrochemical plants where wide-area gas monitoring is required.
Technical Specifications
| Item | Details |
|---|---|
| Manufacturer | Honeywell Analytics |
| Model | 2104B2131 |
| Product Type | Medium-Range Open-Path IR Gas Receiver |
| System | Searchline Excel |
| Certification | ATEX / IECEx (hazardous area approved) |
| Dimensions | 353 × 417 × 300 mm |
| Weight | 7 kg |
| Detection Range | Medium (approx. 40–120 m) |
| Measurement Type | Infrared absorption (open-path) |
| Output Signals | 4–20 mA + RS485 Modbus |
| Power Supply | 18–32 V DC |
| Operating Temperature | -40 °C to +65 °C |
| Enclosure | Industrial corrosion-resistant housing |
Function Description
The 2104B2131 receiver is used to detect and quantify flammable gas concentrations by analyzing an infrared beam sent from a paired transmitter.
Its key functions include:
- Receiving infrared signals from the transmitter
- Measuring beam attenuation caused by hydrocarbon gases
- Calculating gas concentration over a long optical path
- Sending alarm and measurement data to safety systems
- Supporting fire & gas (F&G) and ESD system integration
It does not control equipment directly; it provides measurement input for safety decision systems.
Working Principle
The module operates using open-path infrared absorption detection:
- A transmitter emits a stable IR beam across an open area
- The receiver continuously measures beam intensity
- Gas clouds absorb specific infrared wavelengths
- The received signal is reduced in proportion to gas concentration
- The system calculates concentration over the full path
- Output signals are sent to safety controllers
This enables detection of large-area gas leaks in real time.
System Role
Within Honeywell gas detection architecture, the 2104B2131 performs:
- Medium-range open-path gas monitoring
- Continuous hydrocarbon gas detection
- Early warning for hazardous gas leaks
- Integration with fire & gas safety systems
- Triggering ESD (Emergency Shutdown) responses
It is part of the primary detection layer of industrial safety systems.
Industrial Applications
The Honeywell 2104B2131 is used in:
- Oil and gas refineries
- Offshore drilling platforms
- Petrochemical plants
- LNG facilities
- Storage tank farms
- Pipeline corridors
- Process plants in ATEX hazardous zones
Installation and Integration
- Installed in a paired configuration with a transmitter
- Requires precise line-of-sight alignment
- Mounted on stable industrial structures or towers
- Integrated into fire & gas (F&G) systems
- Connected via 4–20 mA or RS485 Modbus
- Commissioned by certified safety engineers
- Requires periodic calibration and alignment checks
Compatible System Components
- Honeywell Searchline Excel transmitters (short/medium/long range)
- Fire & Gas control panels
- Safety instrumented systems (SIS / FSC / PLC safety systems)
- ATEX-rated junction boxes and mounting kits
- Alarm and shutdown systems (ESD systems)
- Engineering configuration and diagnostic tools
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| 2104B2131 | Medium-range receiver | Open-path IR gas detection | Large industrial areas |
| 2104B2111 | Short-range receiver | Compact detection path | Small hazardous zones |
| 2104B2081 | Medium-range transmitter system | Paired gas detection unit | Wide-area monitoring |
| Point gas detectors | Single-point sensors | Local leak detection | Confined spaces |
| Laser gas detection systems | Advanced optical detection | High precision monitoring | Offshore / critical facilities |
Key Advantages
- ATEX-certified for hazardous environments
- Reliable medium-range open-path detection
- Fast response to hydrocarbon gas clouds
- Strong performance in harsh weather conditions
- Low maintenance compared to point detectors
- Seamless integration with safety systems
- Suitable for continuous 24/7 monitoring
Technical FAQs
Q1: What is the main function of the 2104B2131?
It receives infrared signals and measures gas concentration across an open path.
Q2: Does it work alone?
No. It must be paired with a compatible transmitter.
Q3: What gases can it detect?
It detects hydrocarbon gases such as methane, propane, butane, and similar flammables.
Q4: Where is it used?
It is used in oil & gas, petrochemical, offshore, and other hazardous industrial environments.
Conclusion
The Honeywell 2104B2131 Medium-Range Receiver is a key component in Honeywell Searchline Excel gas detection systems. It provides reliable infrared-based monitoring of flammable gas clouds over medium distances, enabling early detection and safety responses in high-risk industrial environments.
It is widely used in oil, gas, petrochemical, and offshore industries where large-area gas monitoring is critical for operational safety.