Honeywell XNX XNX-UTAV-NHCB1 – MPD catalytic 0–100 %LEL, mV, UL, Aluminium, 3/4" NPT
XNX-UTAV-NHCB1 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), 4–20 mA HART only (no option board), local HART port on the transmitter. 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-NHCB1, 316SS XNX-UTSV-NHCB1, other approval XNX-AMAV-NHCB1. XNX-UTAV-NHCB1 · XNX-UTSV-NHCB1 · XNX-AMAV-NHCB1
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 | N |
| N / H | Local HART port N=no; H=yes | H |
| CB1 | MPD catalytic 0–100 %LEL | CB1 |
Same sensor, swap enclosure/approval: aluminium XNX-UTAV-NHCB1, 316SS XNX-UTSV-NHCB1, other approval XNX-AMAV-NHCB1.
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 | 4–20 mA HART only (no option board) |
| Local HART | local HART port on the transmitter |
| 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-NHCB1 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-NHCB1 | LEL | 0–100 %LEL | HART | 316SS |
| XNX-AMAV-NHCB1 | LEL | 0–100 %LEL | HART | Aluminium |
| XNX-UTAV-NHIV1 | CH₄ | 0–100 %LEL | HART | Aluminium |
| XNX-UTAV-NHIF1 | C₃H₈ | 0–100 %LEL | HART | Aluminium |
| XNX-UTAV-NHIC1 | CO₂ | 0–5 %v/v | HART | Aluminium |
| XNX-UTAV-NHNNN | body | — | HART | Aluminium |
| XNX-UTAV-RHCB1 | LEL | 0–100 %LEL | Relays | Aluminium |
Installation and wiring
Wall-mount XNX-UTAV-NHCB1 (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-NHCB1. Land XNX-UTAV-NHCB1 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-NHCB1 lid stay non-intrusive. Keep silicones off the XNX-UTAV-NHCB1 pellistor; light hydrocarbons high, heavy vapours low.
FAQ
- Install?
- Torque, entries and earthing per the manual.
- Will silicone vapours kill the XNX-UTAV-NHCB1 pellistor?
- Yes. Silicones and chlorinated solvents poison the MPD catalytic bead on XNX-UTAV-NHCB1. Specify IV1/IF1 infrared if those contaminants are routine.
- Which sensors?
- CAT/IR/EC etc. via personality/sensor configuration digits.
- Why is XNX-UTAV-NHCB1 NPT instead of M25?
- XNX-UTAV-NHCB1 is the UL/cUL body and ships 3/4" NPT. Do not tap M25 on this lid—order ATEX sibling XNX-AMAV-NHCB1 if metric glands are mandatory.
- Documents?
- Manual links on SKU/hub pages.
Documents
Honeywell XNX datasheet / manual · On-site XNX selection matrix
Availability and enquiry
Availability: Not in stock — orders accepted; lead time approx. 16 weeks. Quote full P/N XNX-UTAV-NHCB1, gas/range and approval.