Honeywell XNX XNX-UTAV-RNCB1 – MPD catalytic 0–100 %LEL, mV, UL, Aluminium, 3/4" NPT
XNX-UTAV-RNCB1 is a factory-configured Honeywell XNX gas detector: mV personality, MPD catalytic bead 0–100 %LEL, UL / cUL, 4 × 3/4" NPT, LM25 aluminium (painted), 3 relays + 4–20 mA HART, no local HART port. Specify it for mixed hydrocarbon LEL points where infrared windows would fog or the stream is not methane/propane-specific.
Same sensor, swap enclosure/approval: aluminium XNX-UTAV-RNCB1, 316SS XNX-UTSV-RNCB1, other approval XNX-AMAV-RNCB1. XNX-UTAV-RNCB1 · XNX-UTSV-RNCB1 · XNX-AMAV-RNCB1
Part-number decode
| Segment | Meaning | This SKU |
|---|---|---|
| XNX | Honeywell XNX universal transmitter | XNX |
| A / U | Approval A=ATEX/IECEx; U=UL/cUL | U |
| M / T | Entry M=M25; T=3/4" NPT | T |
| A / S | Enclosure A=aluminium; S=316SS | A |
| V / I / E | Personality V=mV(MPD); I=IR Optima/Excel; E=EC | V |
| N / R / M / F | Option N=HART only; R=relays; M=Modbus; F=FFB | R |
| N / H | Local HART port N=no; H=yes | N |
| CB1 | MPD catalytic 0–100 %LEL | CB1 |
Same sensor, swap enclosure/approval: aluminium XNX-UTAV-RNCB1, 316SS XNX-UTSV-RNCB1, other approval XNX-AMAV-RNCB1.
Technical specifications
| Category | Transmitter Configured |
|---|---|
| Personality | mV personality (MPD catalytic / MPD IR) |
| Sensor / range | MPD catalytic 0–100 %LEL |
| Target | LEL / flammable gas (catalytic) |
| Principle | MPD catalytic bead |
| Output | 3 relays + 4–20 mA HART |
| Local HART | no local HART port |
| Supply | 16–32 VDC (24 VDC nominal) |
| Enclosure | LM25 aluminium (painted) |
| Entries | 4 × 3/4" NPT |
| Display | Backlit LCD, magnetic-wand menus |
| Ingress | IP66 |
| Approvals | UL / cUL |
| Temperature | −40~+65 ℃ |
| Mass | approx. 2.8 kg |
| Mates with | Honeywell MPD catalytic bead or MPD infrared sensors |
Why this personality / sensor
A poison-resistant MPD pellistor sees combustion heat across a wide hydrocarbon mix, including species an IR filter misses. It needs oxygen and hates silicones. Mount above light-gas releases and below heavy vapours; keep silicone sealants off the sinter.
Personality and replaceable parts
XNX-UTAV-RNCB1 uses the mV personality (MPD catalytic / MPD IR) board and mates with Honeywell MPD catalytic bead or MPD infrared sensors. Factory-fitted with MPD catalytic 0–100 %LEL. Spares live on product-3991. Do not substitute Sensepoint XCD cartridges on XNX.
Typical applications
Pump rooms, filling gantries and compressor packages still standardise on catalytic LEL because the gas slate is mixed. XNX holds 4–20 mA HART into the ESD matrix; magnetic non-intrusive calibration keeps the flameproof lid closed.
Selection contrast
| P/N | Gas | Range | Option | Body |
|---|---|---|---|---|
| XNX-UTSV-RNCB1 | LEL | 0–100 %LEL | Relays | 316SS |
| XNX-AMAV-RNCB1 | LEL | 0–100 %LEL | Relays | Aluminium |
| XNX-UTAV-RNIV1 | CH₄ | 0–100 %LEL | Relays | Aluminium |
| XNX-UTAV-RNIF1 | C₃H₈ | 0–100 %LEL | Relays | Aluminium |
| XNX-UTAV-RNIC1 | CO₂ | 0–5 %v/v | Relays | Aluminium |
| XNX-UTAV-RNNNN | body | — | Relays | Aluminium |
| XNX-UTAV-NNCB1 | LEL | 0–100 %LEL | HART | Aluminium |
Installation and wiring
Wall-mount XNX-UTAV-RNCB1 (LM25 aluminium (painted), approx. 2.8 kg) on a rigid stand sized for that mass. This SKU uses 4 × 3/4" NPT entries—glands must match; do not retap XNX-UTAV-RNCB1. Land XNX-UTAV-RNCB1 4–20 mA HART per the loop drawing; relays/Modbus/FFB exist only on the matching option board. Magnetic-wand menus on the XNX-UTAV-RNCB1 lid stay non-intrusive. Keep silicones off the XNX-UTAV-RNCB1 pellistor; light hydrocarbons high, heavy vapours low.
FAQ
- Will silicone vapours kill the XNX-UTAV-RNCB1 pellistor?
- Yes. Silicones and chlorinated solvents poison the MPD catalytic bead on XNX-UTAV-RNCB1. Specify IV1/IF1 infrared if those contaminants are routine.
- What bump-test gas should I use on XNX-UTAV-RNCB1?
- Use the target hydrocarbon at 50 %LEL. Methane-only test gas will under-state response if the process is petrol vapour.
- When should I swap XNX-UTAV-RNCB1 aluminium for 316SS?
- Use XNX-UTAV-RNCB1 (aluminium, ~2.8 kg) in inland, painted plant. Coastal, splash and sour-water decks should move to stainless sibling XNX-UTSV-RNCB1.
- Why is XNX-UTAV-RNCB1 NPT instead of M25?
- XNX-UTAV-RNCB1 is the UL/cUL body and ships 3/4" NPT. Do not tap M25 on this lid—order ATEX sibling XNX-AMAV-RNCB1 if metric glands are mandatory.
- What do the three relays on XNX-UTAV-RNCB1 do?
- XNX-UTAV-RNCB1 adds three configurable relays on top of 4–20 mA HART—typically A1/A2/fault. It is not Modbus; bus siblings are XNX-UTAV-MNCB1 / XNX-UTAV-FNCB1.
Documents
Honeywell XNX datasheet / manual · On-site XNX selection matrix
Availability and enquiry
Stock is lot-based. If this box is out, jump to 316SS XNX-UTSV-RNCB1 or UL XNX-UTAV-RNCB1 rather than a dead SKU.