Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | 2104B2071 |
| Manufacturer | Honeywell |
| Product Family | Searchline Excel |
| Device Type | Open-path IR gas detector transmitter |
| Transmitter Configuration | Short Range |
| Nominal Path Length | 5–40 m |
| Approx. Imperial Range | 15–130 ft |
| Detection Principle | Infrared open-path gas detection |
| Certification Variant | CENELEC / ATEX |
| Enclosure Material | 316 stainless steel |
| Supply Voltage | 18–32 VDC |
| Power Consumption | 3.5 / 5.0 W maximum |
| Warm-Up | <5 min operational; <1 h fully stabilized |
| Misalignment Tolerance | ±0.5° |
| Vibration | 2–60 Hz, 1 mm maximum peak-to-peak amplitude |
| EMC | EN 50270:1999 |
| Hazardous-Area Rating | EExd IIC T5 |
| Certified Ambient Temperature | −40 to +65°C |
| Weight with Mounting Bracket | Approx. 3.5 kg |
| Conduit | Included with specified 2104B2071 configuration |
Honeywell’s Searchline Excel handbook identifies 2104B2071 specifically as the Short Range Open-Path Transmitter for the CENELEC configuration. Honeywell’s documentation also distinguishes it from 2104B2081 and 2104B2091, which are the medium- and long-range transmitter variants.
Product Introduction
The Honeywell 2104B2071 is a Searchline Excel short-range open-path infrared transmitter designed for continuous flammable-gas detection across an open optical path. Unlike a point gas detector, it monitors gas absorption along the space between the transmitter and receiver, making the architecture suitable for applications where a gas cloud could develop across a defined area rather than directly at a single sensing point. Honeywell specifies this version for a 5–40 m detection path.
The 2104B2071 is the ATEX/CENELEC short-range transmitter configuration and is supplied with conduit as part of the specified assembly. The transmitter uses an explosion-protected 316 stainless-steel enclosure and is documented for EExd IIC T5, with a certified ambient range of −40 to +65°C.
HONEYWELL 2104B2071
Engineering Pain Point
The common field mistake is treating the 2104B2071 as a complete gas detection system by itself. It is the transmitter half of a Searchline Excel open-path arrangement. A compatible receiver, correctly established optical path, alignment, wiring, and control-system interface are required for the detection system to operate correctly. Honeywell’s parts matrix separately identifies short-, medium-, and long-range receivers, confirming that the transmitter and receiver are distinct system components.
Typical Applications
- Flammable-gas monitoring around process plants, hydrocarbon facilities, and other hazardous areas.
- Open-area monitoring where a gas cloud may cross a defined 5–40 m optical path.
- Continuous hydrocarbon-gas detection using Searchline Excel infrared technology.
- Existing Searchline Excel installations requiring replacement of an ATEX short-range transmitter.
Technical Pitfalls to Avoid
- Do not confuse the transmitter with the receiver. Honeywell identifies 2104B2071 as the short-range transmitter; 2104B2111 and 2104B2112 are separate short-range receiver variants for current-source and current-sink configurations.
- Verify the detection distance. The short-range transmitter is intended for a 5–40 m path. Medium- and long-range transmitters use different part numbers: 2104B2081 and 2104B2091 respectively.
- Match the certification variant. 2104B2071 is the CENELEC/ATEX configuration. Honeywell lists separate UL and CSA/FM part numbers for the same short-range transmitter family.
- Do not substitute a receiver for the transmitter. The Searchline Excel architecture depends on the optical relationship between the two units. A correct-looking housing with the wrong functional role will not solve a transmitter fault.
- Check alignment after replacement. Honeywell specifies approximately ±0.5° misalignment tolerance for the short-range system. Mechanical installation, vibration, mounting rigidity, and optical alignment therefore matter during commissioning.
- Respect the hazardous-area temperature limit. The documented ATEX rating is EExd IIC T5, −40 to +65°C. Do not substitute a broader ambient-temperature claim from another Searchline Excel variant.
- Check the complete part number before procurement. Honeywell uses different suffixes for transmitter range and certification. The difference between 2104B2071, 2104B3001, and 2104B3201 is not cosmetic; these represent different certification configurations.
Related Products
- Honeywell 2104B2081 — Searchline Excel medium-range transmitter for approximately 40–120 m paths; not a direct replacement for the 2104B2071 short-range unit.
- Honeywell 2104B2091 — Searchline Excel long-range transmitter for approximately 120–200 m paths; different optical range.
- Honeywell 2104B2111 — Short-range receiver, ATEX, current-source configuration; functions as the receiving unit rather than the transmitter.
- Honeywell 2104B2112 — Short-range receiver, ATEX, current-sink configuration; verify control-system signal architecture before selection.
- Honeywell 2104B2131 — Medium-range receiver, ATEX, current-source configuration.
- Honeywell 2104B2132 — Medium-range receiver, ATEX, current-sink configuration.
- Honeywell 2104B2151 — Long-range receiver, ATEX, current-source configuration.
- Honeywell 2104B2152 — Long-range receiver, ATEX, current-sink configuration.
- Honeywell 2104B2321 — Short-range alignment telescope used with Searchline Excel installations; it is an alignment accessory rather than a detector.
- Honeywell 2104B2301 — Short-range mounting bracket and isolation kit for Searchline Excel installations.
Procurement Note
For Honeywell 2104B2071, specify the complete identifier and configuration:
2104B2071 → Searchline Excel → Short-Range Transmitter → ATEX/CENELEC → 5–40 m
Before replacement, verify the receiver part number, optical path length, certification jurisdiction, hazardous-area classification, transmitter/receiver wiring arrangement, mounting hardware, and alignment condition.
Honeywell’s current technical handbook explicitly retains 2104B2071 in the Searchline Excel spare-parts matrix as the Short Range Transmitter Incl Conduit ATEX. That makes the complete part number more useful for procurement than a generic description such as “Searchline Excel transmitter.”
