Honeywell Searchline Excel R2104B3123 – Receiver, Long range 120–200 m (65–650 ft), UL, 4–20 mA sink
R2104B3123 is a Honeywell Searchline Excel infrared open-path flammable gas detector SKU (Receiver, Long range 120–200 m (65–650 ft), 4–20 mA sink, UL) for ethylene over 0–5 LEL·m. Match the transmitter/receiver pair on the purchase order; do not substitute Searchline Excel Plus/Edge SLXL- codes.
Siblings: output 2104B3121, approval 2104B2152, path 2104B3101.
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Part-number decode
| Segment | Meaning | This SKU |
|---|---|---|
| Family | Searchline Excel IR open path | legacy |
| Type | System / alignment / accessory / spare | Receiver |
| Path | SR 5–40 m / MR 40–120 m / LR 120–200 m | Long range 120–200 m (65–650 ft) |
| Output | 4–20 mA source or sink, optional Modbus/HART | 4–20 mA sink |
| Approval | ATEX/IECEx, UL, CSA/FM, INMETRO, CU-TR | UL |
| Gas | Hydrocarbon or ethylene curve | Ethylene |
| Enclosure | 316 stainless steel | 316SS |
| Handheld | Alignment kit includes HHI | — |
Technical specifications
| Category | legacy / Receiver |
|---|---|
| Description | Searchline Excel, receiver, Long range 120–200 m (65–650 ft), 4–20 mA sink, UL (LONG RANGE RECEIVER SINK UL ETHYLENE) |
| Gas | Ethylene |
| Path length | Long range 120–200 m (65–650 ft) |
| Range | 0–5 LEL·m |
| Output | 4–20 mA sink |
| Approvals | UL |
| Enclosure | 316 不锈钢 |
| Principle | Open-path IR (xenon flash + solid-state detector) |
| Response | T90 < 3 s |
| Ingress | IP66/IP67 |
Why this part number
Order R2104B3123 when the path length, source/sink loop and approval must be locked together: Searchline Excel, receiver, Long range 120–200 m (65–650 ft), 4–20 mA sink, UL (LONG RANGE RECEIVER SINK UL ETHYLENE). Open-path IR covers vapour clouds that point detectors miss; T90 is under 3 s with xenon-flash solar immunity. If this SKU is short, jump to 2104B3121 (output) or 2104B2152 (approval).
Spares and mates
R2104B3123 is Searchline Excel Receiver. The open-path system is 316SS Tx+Rx, 0–5 LEL·m. Matrix: product-9020. Do not substitute Sensepoint XCD cartridges, XNX personalities or Excel Plus/Edge.
Typical applications
R2104B3123 is sized for offshore decks, FPSO process areas, tank-farm bunds, compressor halls and pipe racks. Keep the beam clear after alignment; dual-band filters handle fog/rain without software masking.
Selection contrast
| P/N | Type | Path | Cert | Output |
|---|---|---|---|---|
| 2104B3121 | Receiver | LR | UL | 4–20 mA source |
| 2104B2152 | Receiver | LR | ATEX | 4–20 mA sink |
| 2104B3101 | Receiver | SR | UL | 4–20 mA source |
| 2104B2111 | Receiver | SR | CE | see description |
| 2104B2112 | Receiver | SR | ATEX | 4–20 mA sink |
| 2104B2113 | Receiver | — | — | see description |
| 2104B2132 | Receiver | MR | ATEX | see description |
Installation and service
Align R2104B3123 with the rifle-scope kit until the Tx/Rx optical axis is locked (±0.5°). Path is Long range 120–200 m (65–650 ft); mount on a rigid structure and keep the beam clear. Power is 18–32 VDC. Land 4–20 mA on the fire-and-gas matrix; Modbus uses DVC100(m) MKII or DX100(m). Window heaters are a standard option for severe weather.
FAQ
- Is R2104B3123 a point IR head?
- No. R2104B3123 is Searchline Excel open-path IR with a separate transmitter and receiver. Point IR is Searchpoint Optima Plus.
- Can I rescale R2104B3123 to 0–100 %LEL?
- Open-path range is 0–5 LEL·m (alarms typically 1.0 / 3.0 LEL·m). Cross-duct is a different 0–100 %LEL SKU family.
- Can I flip source/sink in the field?
- No. This SKU is 4–20 mA sink. Order 2104B3121 for the other loop polarity.
- Can I mix SR lamps with LR receivers?
- No. R2104B3123 is Long range 120–200 m (65–650 ft). Change span with 2104B3101; medium/long-range lamps draw more power.
- Is R2104B3123 Excel Plus or Edge?
- No. Plus/Edge uses SLXL- codes. This family is Searchline Excel IR (02104-N / 2104B).
- Can I retap the approval?
- No. R2104B3123 is UL. Other approvals are sibling 2104B2152.
Documents
Searchline Excel IR datasheet · Chinese specification · On-site part-number matrix
Availability and enquiry
Stock is lot-based. If R2104B3123 is out, jump to 2104B3121 / 2104B2152.