Honeywell XNX XNX-UTSV-MHCB1 – MPD catalytic 0–100 %LEL, mV, UL, 316SS, 3/4" NPT
XNX-UTSV-MHCB1 is a factory-configured Honeywell XNX gas detector: mV personality, MPD catalytic bead 0–100 %LEL, UL / cUL, 4 × 3/4" NPT, 316 stainless steel, Modbus RTU + 4–20 mA HART, 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-MHCB1, 316SS XNX-UTSV-MHCB1, other approval XNX-AMSV-MHCB1. XNX-UTAV-MHCB1 · XNX-UTSV-MHCB1 · XNX-AMSV-MHCB1
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 | S |
| 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 | M |
| 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-MHCB1, 316SS XNX-UTSV-MHCB1, other approval XNX-AMSV-MHCB1.
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 | Modbus RTU + 4–20 mA HART |
| Local HART | local HART port on the transmitter |
| Supply | 16–32 VDC (24 VDC nominal) |
| Enclosure | 316 stainless steel |
| Entries | 4 × 3/4" NPT |
| Display | Backlit LCD, magnetic-wand menus |
| Ingress | IP66 |
| Approvals | UL / cUL |
| Temperature | −40~+65 ℃ |
| Mass | approx. 5.0 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-UTSV-MHCB1 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-UTAV-MHCB1 | LEL | 0–100 %LEL | Modbus | Aluminium |
| XNX-AMSV-MHCB1 | LEL | 0–100 %LEL | Modbus | 316SS |
| XNX-UTSV-MHIV1 | CH₄ | 0–100 %LEL | Modbus | 316SS |
| XNX-UTSV-MHIF1 | C₃H₈ | 0–100 %LEL | Modbus | 316SS |
| XNX-UTSV-MHIC1 | CO₂ | 0–5 %v/v | Modbus | 316SS |
| XNX-UTSV-MHNNN | body | — | Modbus | 316SS |
| XNX-UTSV-NHCB1 | LEL | 0–100 %LEL | HART | 316SS |
Installation and wiring
Wall-mount XNX-UTSV-MHCB1 (316 stainless steel, approx. 5.0 kg) on a rigid stand sized for that mass. This SKU uses 4 × 3/4" NPT entries—glands must match; do not retap XNX-UTSV-MHCB1. Land XNX-UTSV-MHCB1 4–20 mA HART per the loop drawing; relays/Modbus/FFB exist only on the matching option board. Magnetic-wand menus on the XNX-UTSV-MHCB1 lid stay non-intrusive. Keep silicones off the XNX-UTSV-MHCB1 pellistor; light hydrocarbons high, heavy vapours low.
FAQ
- Will silicone vapours kill the XNX-UTSV-MHCB1 pellistor?
- Yes. Silicones and chlorinated solvents poison the MPD catalytic bead on XNX-UTSV-MHCB1. Specify IV1/IF1 infrared if those contaminants are routine.
- What bump-test gas should I use on XNX-UTSV-MHCB1?
- Use the target hydrocarbon at 50 %LEL. Methane-only test gas will under-state response if the process is petrol vapour.
- Why is XNX-UTSV-MHCB1 316SS instead of aluminium?
- XNX-UTSV-MHCB1 is the marine/sour-service body (~5 kg). Inland dry rooms can take aluminium sibling XNX-UTAV-MHCB1 and save mass on the bracket.
- Why is XNX-UTSV-MHCB1 NPT instead of M25?
- XNX-UTSV-MHCB1 is the UL/cUL body and ships 3/4" NPT. Do not tap M25 on this lid—order ATEX sibling XNX-AMSV-MHCB1 if metric glands are mandatory.
- Can I retrofit Foundation Fieldbus on XNX-UTSV-MHCB1 after it ships?
- No. XNX-UTSV-MHCB1 is the Modbus RTU option board. FFB is a different sales option (XNX-UTSV-FHCB1), not a jumper on this lid.
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-MHCB1 or UL XNX-UTSV-MHCB1 rather than a dead SKU.