Honeywell Sensepoint XCD SPXCDASMG1 – Fixed H₂ Detector (0-1000ppm, Electrochemical (Surecell™), ATEX, 316SS, M20)
SPXCDASMG1 is the Sensepoint XCD hydrogen electrochemical transmitter, fixed 0–1000 ppm, 316 stainless steel, 2 × M20, ATEX / IECEx / GB. It is the ppm-level H₂ leak SKU for battery rooms and electrolyser halls, not a %LEL catalytic detector.
Same gas, swap enclosure/approval: aluminium SPXCDALMG1, 316SS SPXCDASMG1, UL SPXCDULNG1. SPXCDALMG1 · SPXCDASMG1 · SPXCDULNG1
Part-number decode
| Segment | Meaning | This SKU |
|---|---|---|
| SPXCD | Sensepoint XCD series | SPXCD |
| A / U | Approval A=ATEX/IECEx/GB; U=UL | A |
| L / S | Enclosure L=LM25 aluminium; S=316SS | S |
| M / N | Entry M=M20; N=3/4" NPT | M |
| G1 | Gas hydrogen, Electrochemical (Surecell™) | G1 |
Same gas, swap enclosure/approval: aluminium SPXCDALMG1, 316SS SPXCDASMG1, UL SPXCDULNG1.
Technical specifications
| Target gas | H₂ / hydrogen |
|---|---|
| Principle | Electrochemical (Surecell™) |
| Default range | 0-1000ppm |
| User FSD window | Fixed 1000ppm |
| Resolution | n/a |
| Output | 4–20 mA sink/source + optional Modbus RTU |
| Supply | 16–32 VDC (24 VDC nominal) |
| Power | 3.7 W |
| Enclosure | 316 stainless steel |
| Entries | 2 × M20 |
| Display | Tri-colour backlight LCD |
| Relays | 3×5A@250VAC |
| Ingress | IP66 |
| Approvals | ATEX / IECEx / GB |
| Temperature | −40~+65 ℃ |
| Mass | approx. 3.1 kg (6.8 lb) |
Why this principle for this gas
Hydrogen is much lighter than air and jets to the highest ceiling pocket. The G1 Surecell™ is a toxic-range electrochemical cell for early leak detection; it is not a 0–100 %LEL pellistor. Mount at the roof ridge or above the battery racks and fit a collecting cone because H₂ will otherwise bypass a wall sensor.
Sensor and replaceable parts
OEM cartridge SPXCDXSG1SS. Calibration cap S3KCAL. Fit a collecting cone on hydrogen; do not cone a heavier-than-air H₂S head. Pipe/duct kits: SPXCDMTBR / SPXCDDMK.
Typical applications
UPS battery rooms, electrolyser containers and hydrogen tube-trailer bays need a fast ppm trip before the cloud reaches LEL. XCD can sit outside the container with a remote head on the ceiling—again a portable cannot hold that point.
Selection contrast
| P/N | Gas | Range | Principle |
|---|---|---|---|
| SPXCDASMG1 | H₂ | 0-1000ppm | EChem |
| SPXCDASMCX | CO | 0-300ppm | EChem |
| SPXCDASMFX | LEL | 0-100%LEL | Catalytic bead |
| SPXCDASMHX | H₂S | 0-50ppm | EChem |
| SPXCDALMG1 | H₂ | 0-1000ppm | EChem |
| SPXCDULNG1 | H₂ | 0-1000ppm | EChem |
Installation and wiring
Wall-mount SPXCDASMG1 (hydrogen, 316 stainless steel) through the one-piece plate with M8 bolts sized for that mass. This SKU uses 2 × M20 entries: pipe kit SPXCDMTBR covers Ø1.5–3″, duct kit is SPXCDDMK, and glands must match—do not retap SPXCDASMG1. Land SPXCDASMG1 4–20 mA as three-wire and set Modbus address from the menu only. Magnetic wand calibration on the SPXCDASMG1 lid stays non-intrusive. SPXCDASMG1 hydrogen must sit on the ceiling with a collecting cone.
FAQ
- SPXCDASMG1: Is G1 a flammable LEL detector?
- SPXCDASMG1 — No. 0–1000 ppm is a leak range. For 0–100 %LEL hydrogen you need a different sensing principle and SKU family.
- SPXCDASMG1: Do I need a collecting cone?
- SPXCDASMG1 — Yes for hydrogen. Unlike H₂S, H₂ rises; the Honeywell weather/collecting cone is recommended on ceiling mounts.
- What weight penalty does 316SS add on SPXCDASMG1?
- SPXCDASMG1 is ~6.8 lb versus ~4.4 lb for aluminium sibling SPXCDALMG1. The extra mass buys chloride resistance for this hydrogen point; keep M8 wall bolts at the stamped size.
- Can I convert SPXCDASMG1 from ATEX M20 to NPT in the field?
- No. SPXCDASMG1 flameproof entries are machined M20. North-American NPT is UL sibling SPXCDULNG1, not an adaptor on this ATEX hydrogen body.
- Can I retrofit Modbus on SPXCDASMG1 after it ships?
- Modbus RTU on SPXCDASMG1 is a transmitter sales option, not a jumper on the hydrogen lid. Confirm the option before the box leaves; 4–20 mA sink/source is already on this SKU.
Documents
Honeywell Sensepoint XCD datasheet / manual · On-site XCD selection matrix
Availability and enquiry
Stock is lot-based. If this aluminium ATEX box is out, jump to 316SS SPXCDASMG1 or UL SPXCDULNG1 rather than a dead SKU.