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- 2104B2111
- Short-Range Receiver ATEX Power Supply
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- 140 × 150 × 152 mm
- 0.7 kg
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Product Overview
The Honeywell 2104B2111 Short-Range Receiver is an ATEX-certified receiver unit used in Honeywell Searchline Excel open-path infrared gas detection systems. It works together with a matching transmitter to form a complete gas detection path for monitoring flammable gas concentrations in hazardous environments.
This receiver is responsible for detecting infrared beam attenuation caused by gas presence and converting it into measurable safety signals for control systems.
Technical Specifications
| Item | Details |
|---|---|
| Manufacturer | Honeywell Analytics |
| Model | 2104B2111 |
| Product Type | Short-Range Open-Path IR Gas Receiver |
| System | Searchline Excel |
| Certification | ATEX / IECEx (hazardous area approved) |
| Dimensions | 140 × 150 × 152 mm |
| Weight | 0.7 kg |
| Detection Range | Short range (approx. 5–40 m) |
| Measurement Output | 4–20 mA + RS485 Modbus |
| Power Supply | 18–32 V DC |
| Operating Temperature | -40 °C to +65 °C |
| Protection Class | Industrial hazardous area enclosure |
| Function Role | Infrared signal reception and gas concentration calculation |
Function Description
The 2104B2111 receiver is used to measure gas concentration by analyzing infrared beam changes from a paired transmitter.
Its main functions include:
- Receiving infrared signals from the transmitter
- Detecting attenuation caused by hydrocarbon gas clouds
- Calculating gas concentration along the optical path
- Sending analog and digital output signals to control systems
- Supporting alarm and safety shutdown decisions
It does not initiate control actions; it provides measurement data for safety systems.
Working Principle
The module operates using open-path infrared absorption detection:
- A transmitter emits a stable infrared beam
- The receiver continuously measures beam intensity
- If flammable gas is present, it absorbs specific IR wavelengths
- The receiver detects reduced signal strength
- Gas concentration is calculated over the beam path
- Output signals are sent to fire & gas or SIS systems
This enables fast detection of gas leaks across open areas.
System Role
Within Honeywell gas detection systems, the 2104B2111 performs:
- Infrared beam reception and analysis
- Gas concentration measurement (open-path detection)
- Integration with fire & gas control systems
- Alarm triggering for ESD (emergency shutdown) systems
- Continuous hazardous area monitoring
It is part of the primary sensing layer in industrial safety systems.
Industrial Applications
The Honeywell 2104B2111 is widely used in:
- Oil and gas refineries
- Offshore platforms
- Petrochemical plants
- LNG facilities
- Storage tank farms
- Pipeline monitoring zones
- Hazardous ATEX-classified environments
Installation and Integration
- Installed opposite a matching transmitter (line-of-sight alignment required)
- Mounted on stable structures or dedicated brackets
- Integrated into fire & gas (F&G) systems
- Connected via 4–20 mA or RS485 Modbus
- Requires precise optical alignment and calibration
- Commissioned by certified safety engineers
Compatible System Components
- Honeywell Searchline Excel transmitters (short/medium/long range)
- Fire & Gas (F&G) control panels
- Safety instrumented systems (SIS / FSC / PLC safety systems)
- ATEX junction boxes and mounting kits
- Alarm and shutdown systems (ESD)
- Engineering diagnostic and calibration tools
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| 2104B2111 | Short-range receiver | Open-path IR detection | Small hazardous zones |
| 2104B2081 | Medium-range transmitter/receiver system | Extended coverage | Large industrial areas |
| 2104B2071 | Short-range transmitter | Paired detection unit | Compact installations |
| Point IR gas detectors | Single-point sensors | Local detection | Confined spaces |
| Laser gas detectors | Advanced optical systems | High precision monitoring | Offshore and refinery systems |
Key Advantages
- ATEX-certified for hazardous environments
- Fast response to flammable gas presence
- Reliable open-path detection over short distances
- Minimal maintenance compared to point detectors
- Strong integration with safety shutdown systems
- High stability in harsh industrial conditions
- Suitable for continuous 24/7 monitoring
Technical FAQs
Q1: What is the main function of the 2104B2111?
It receives infrared signals and calculates gas concentration in an open-path system.
Q2: Does it work alone?
No. It must be paired with a compatible transmitter.
Q3: What gases does it detect?
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 2104B2111 Short-Range Receiver is a critical component of Honeywell Searchline Excel gas detection systems. It provides reliable infrared-based detection of flammable gases over short distances, supporting early warning and emergency shutdown actions in hazardous environments.
It is widely deployed in high-risk industries where fast and accurate gas detection is essential for operational safety.