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Technical specifications for 2104B2111 RX SHORT
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Manufacturer:Honeywell
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Product Category:General Automation
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Spare Part Number:2104B2111 RX SHORT
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Weight:3.5 kg
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Tariff Code:8537101190
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Product family:Searchline Excel open-path infrared gas detector
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Receiver order code:2104B2111; standard short-range ATEX receiver
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Optical path:5–40 m with matching short-range transmitter
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Measuring range:0–5 LEL.m; path-integrated gas measurement
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Nominal supply:24 V DC
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Receiver terminal voltage:18–32 V DC
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Receiver power consumption:8 W maximum
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Gas signal:4–20 mA
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Service interface:RS485 for SHC1 handheld interrogator
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System response:T90 less than 3 seconds
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Operational warm-up:Less than 5 minutes
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Full stabilization:Less than 1 hour
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Fault output:0 mA
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Inhibit output:2 mA
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Beam-block output:2.5 mA
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Low-signal output:3 mA
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Overrange output:21 mA
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Enclosure material:316 stainless steel
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Ingress protection:IP66 / IP67
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Operating temperature:-40 to +65 °C
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Storage temperature:-40 to +65 °C
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Humidity:0–99% RH, noncondensing
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Optical window:Controlled heater
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Power and signal wires:Red +24 V; black 0 V; white 4–20 mA
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RS485 wires:Orange A; blue B
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Protective earth wire:Green/yellow
Information
Overview
Downloads
Applications / Compatibility
Product Precautions
- Honeywell 2104B2111 RX SHORT receives the modulated infrared beam from the paired Searchline Excel transmitter and converts path-integrated hydrocarbon absorption into an analog gas signal for the control system.
Receiver: Standard short-range ATEX version
Optical path: 5–40 m with matching transmitter
Measurement: 0–5 LEL.m
Optical path: 5–40 m with matching transmitter
Measurement: 0–5 LEL.m
The receiver compares infrared sample and reference channels to distinguish gas absorption from common optical attenuation. This architecture measures gas concentration integrated along the beam; a LEL.m value must be interpreted with the installed path and gas calibration rather than as a point-detector percentage.
Power, analog output and service communications enter through separate identified conductors. The receiver operates from 18–32 V DC at its terminals and provides 4–20 mA measurement plus distinct fault, inhibit and optical-status levels. RS485 supports alignment, initialization, diagnostics and functional checks through the SHC1 interrogator.
A heated optical window, stainless-steel enclosure and IP66/IP67 protection support outdoor service when the equipment is installed correctly. Stable supports and an unobstructed beam are essential: commissioning includes optical alignment, electronic optimization and initialization, followed by gas-response and control-system checks.
Power, analog output and service communications enter through separate identified conductors. The receiver operates from 18–32 V DC at its terminals and provides 4–20 mA measurement plus distinct fault, inhibit and optical-status levels. RS485 supports alignment, initialization, diagnostics and functional checks through the SHC1 interrogator.
A heated optical window, stainless-steel enclosure and IP66/IP67 protection support outdoor service when the equipment is installed correctly. Stable supports and an unobstructed beam are essential: commissioning includes optical alignment, electronic optimization and initialization, followed by gas-response and control-system checks.
Detector platform reference: Honeywell Searchline Excel. Match the transmitter, path length and gas calibration before commissioning.
Technical downloads for Honeywell 2104B2111 RX SHORT: a manufacturer technical excerpt and an Apter Power installation and commissioning guide.
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Honeywell 2104B2111 RX SHORT technical reference
Original manufacturer excerpt - PDF, 9 pages. Receiver identity, operating principle, power supply, commissioning and specifications. -
Honeywell 2104B2111 RX SHORT installation guide
Prepared by Apter Power - PDF, 4 pages. Identity checks, installation, configuration, commissioning and maintenance handover.
The technical reference preserves selected manufacturer pages. The installation guide is compiled by Apter Power for preparation and review; apply the original operating procedures and site controls during work.
Optical system integration: Use the receiver with a matching short-range Searchline Excel transmitter and a control input configured for the documented analog signal and status levels.
Application assessment: The arrangements below describe installation contexts. Review gas hazards, beam placement and the site alarm strategy with the responsible engineer.
Application assessment: The arrangements below describe installation contexts. Review gas hazards, beam placement and the site alarm strategy with the responsible engineer.
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Open-path gas monitoring
Monitor a clear line of sight where a hydrocarbon gas cloud may intersect the beam. Select the optical path to suit the site hazard assessment. -
Perimeter and process-area coverage
Position stable transmitter and receiver supports around the protected process area, keeping routine access and moving obstructions clear of the beam. -
Analog control-system integration
Use the 4–20 mA channel for gas measurement and recognize fault, inhibit, low-signal and beam-block outputs separately from gas alarms. -
Installed receiver maintenance
Retain the original path, paired transmitter and gas-calibration record when planning a receiver exchange; repeat alignment and functional acceptance.
Install and commission Honeywell 2104B2111 RX SHORT using qualified personnel and the applicable hazardous-area instructions. Control alarms and shutdowns before optical tests or maintenance.
Protect the hazardous-area boundary
Do not open the enclosure in an explosive atmosphere. Use approved glands, termination equipment and installation practices for the actual unit certification.
Preserve the optical path
Keep the beam free of permanent or moving obstructions. Mount both ends on stable supports and avoid alignment during heavy rain or fog.
Check terminal voltage
Measure the supply at the receiver under load. Cable voltage drop must leave 18–32 V DC at the terminals, with the required earth connection.
Align and initialize
Use the correct telescope and SHC1 procedure to optimize both optical and electronic alignment. Do not look at the sun through the alignment telescope.
Clean without damaging optics
Use clean water and a soft cloth; avoid solvents and abrasive materials. Apply the approved inhibit procedure and recheck the clear-path zero afterward.
Prove the whole alarm path
Select the correct test filter for the unit configuration. Confirm the receiver output and control-system response before removing maintenance inhibits.
Alternative Names
2104B2111 RX SHORT
Honeywell 2104B2111 RX SHORT
Technical notes
Measurement boundary: LEL.m expresses gas concentration integrated over the optical path. It does not directly represent a point concentration.
Commissioning: Receiver, transmitter, gas calibration and path length must agree with the installed-system record; alignment and initialization precede release.
Technical reference: Honeywell Searchline Excel Infrared Gas Detectors Technical Handbook, 2104M0506, MAN0530 Issue 12 (10/12). The 2104B2111 entry identifies the short-range ATEX receiver.
FAQ View All FAQ
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What does 2104B2111 RX SHORT measure?With a matching transmitter, the Searchline Excel system measures hydrocarbon gas integrated along the optical beam over 0–5 LEL.m. This is a path-integrated reading, not a point-detector gas percentage.
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What optical distance applies to 2104B2111 RX SHORT?The short-range arrangement covers 5–40 m with the corresponding short-range transmitter. Confirm the measured installation distance during alignment and initialization.
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What voltage must reach 2104B2111 RX SHORT under load?The receiver requires 18–32 V DC at its terminals, nominally 24 V DC, with a maximum operating consumption of 8 W. Allow for voltage drop in the installed cable.
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How does 2104B2111 RX SHORT report a blocked beam?The normal beam-block output is 2.5 mA, subject to configured timing. If the signal is lost after a gas level above the internal threshold, the detector can hold the previous gas reading instead; assess the actual configuration.
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What is the RS485 connection on 2104B2111 RX SHORT used for?The orange A and blue B conductors provide the service interface for the SHC1 handheld interrogator. The interface supports alignment, commissioning, functional tests and diagnostics.
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Why must 2104B2111 RX SHORT be initialized after alignment?Optical alignment alone does not establish the commissioned state. Complete electronic optimization and the handbook initialization procedure so the receiver accepts the path configuration and valid operating signal.
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How long does 2104B2111 RX SHORT take to warm up?The handbook specifies less than 5 minutes to become operational and less than 1 hour for full stabilization. Plan zero and acceptance checks around the stabilized condition.
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How should the optical window of 2104B2111 RX SHORT be cleaned?Use clean water and a soft cloth, without solvents or abrasives. Control alarm consequences with the approved inhibit procedure, restore a clear gas-free path, and check zero and normal operation before release.
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