Honeywell XNX XNX-AMSV-NHCB1 – MPD catalytic 0–100 %LEL, mV, ATEX, 316SS, M25
XNX-AMSV-NHCB1 is a factory-configured Honeywell XNX gas detector: mV personality, MPD catalytic bead 0–100 %LEL, ATEX / IECEx (INMETRO on selected MPD SKUs), 4 × M25, 316 stainless steel, 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-AMAV-NHCB1, 316SS XNX-AMSV-NHCB1, other approval XNX-UTSV-NHCB1. XNX-AMAV-NHCB1 · XNX-AMSV-NHCB1 · XNX-UTSV-NHCB1
Part-number decode
| Segment | Meaning | This SKU |
|---|---|---|
| XNX | Honeywell XNX universal transmitter | XNX |
| A / U | Approval A=ATEX/IECEx; U=UL/cUL | A |
| M / T | Entry M=M25; T=3/4" NPT | M |
| 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 | 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-AMAV-NHCB1, 316SS XNX-AMSV-NHCB1, other approval XNX-UTSV-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 | 316 stainless steel |
| Entries | 4 × M25 |
| Display | Backlit LCD, magnetic-wand menus |
| Ingress | IP66 |
| Approvals | ATEX / IECEx (INMETRO on selected MPD SKUs) |
| 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-AMSV-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-AMAV-NHCB1 | LEL | 0–100 %LEL | HART | Aluminium |
| XNX-UTSV-NHCB1 | LEL | 0–100 %LEL | HART | 316SS |
| XNX-AMSV-NHIV1 | CH₄ | 0–100 %LEL | HART | 316SS |
| XNX-AMSV-NHIF1 | C₃H₈ | 0–100 %LEL | HART | 316SS |
| XNX-AMSV-NHIC1 | CO₂ | 0–5 %v/v | HART | 316SS |
| XNX-AMSV-NHNNN | body | — | HART | 316SS |
| XNX-AMSV-RHCB1 | LEL | 0–100 %LEL | Relays | 316SS |
Installation and wiring
Wall-mount XNX-AMSV-NHCB1 (316 stainless steel, approx. 5.0 kg) on a rigid stand sized for that mass. This SKU uses 4 × M25 entries—glands must match; do not retap XNX-AMSV-NHCB1. Land XNX-AMSV-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-AMSV-NHCB1 lid stay non-intrusive. Keep silicones off the XNX-AMSV-NHCB1 pellistor; light hydrocarbons high, heavy vapours low.
FAQ
- Will silicone vapours kill the XNX-AMSV-NHCB1 pellistor?
- Yes. Silicones and chlorinated solvents poison the MPD catalytic bead on XNX-AMSV-NHCB1. Specify IV1/IF1 infrared if those contaminants are routine.
- What bump-test gas should I use on XNX-AMSV-NHCB1?
- Use the target hydrocarbon at 50 %LEL. Methane-only test gas will under-state response if the process is petrol vapour.
- Why is XNX-AMSV-NHCB1 316SS instead of aluminium?
- XNX-AMSV-NHCB1 is the marine/sour-service body (~5 kg). Inland dry rooms can take aluminium sibling XNX-AMAV-NHCB1 and save mass on the bracket.
- Can I convert XNX-AMSV-NHCB1 from ATEX M25 to NPT in the field?
- No. XNX-AMSV-NHCB1 flameproof entries are machined M25. North-American NPT is UL sibling XNX-UTSV-NHCB1, not an adaptor on this ATEX body.
- Does XNX-AMSV-NHCB1 include alarm relays?
- No. XNX-AMSV-NHCB1 is 4–20 mA HART only. Local trip contacts need option-R sibling XNX-AMSV-RHCB1; plant-bus needs Modbus XNX-AMSV-MHCB1 or Foundation Fieldbus XNX-AMSV-FHCB1.
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-AMSV-NHCB1 or UL XNX-UTSV-NHCB1 rather than a dead SKU.