Honeywell Sensepoint XCD SPXCDASMCX – Fixed CO Detector (0-300ppm, Electrochemical (Surecell™), ATEX, 316SS, M20)
SPXCDASMCX is the Sensepoint XCD carbon monoxide variant, 0–300 ppm electrochemical default, 316 stainless steel, 2 × M20, ATEX / IECEx / GB. Use it on boiler rooms, enclosed car parks and furnace galleries where CO is near-neutral buoyancy and a wall-mounted 4–20 mA point is safer than a clip-on badge.
Same gas, swap enclosure/approval: aluminium SPXCDALMCX, 316SS SPXCDASMCX, UL SPXCDULNCX. SPXCDALMCX · SPXCDASMCX · SPXCDULNCX
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 |
| CX | Gas carbon monoxide, Electrochemical (Surecell™) | CX |
Same gas, swap enclosure/approval: aluminium SPXCDALMCX, 316SS SPXCDASMCX, UL SPXCDULNCX.
Technical specifications
| Target gas | CO / carbon monoxide |
|---|---|
| Principle | Electrochemical (Surecell™) |
| Default range | 0-300ppm |
| User FSD window | 100-1000ppm |
| Resolution | 100ppm |
| 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
CO mixes through the occupied layer instead of pooling on the floor. Electrochemical Surecell™ is chosen for ppm resolution and cross-interference control versus catalytic beads that only see flammability. Mount at breathing height (1.5–1.8 m) on the downwind wall of the boiler or parking deck; a floor mount will under-read a stratified plume.
Sensor and replaceable parts
OEM cartridge SPXCDXSCXSS. Calibration cap S3KCAL. Collecting cone follows buoyancy—see installation. Pipe/duct kits: SPXCDMTBR / SPXCDDMK.
Typical applications
Specify this SKU for boiler houses, tunnel plant rooms, sinter galleries and enclosed loading docks. A fixed XCD point gives a hard-wired trip to the ventilation starter and a local tri-colour display; a portable only records the minute you walked past.
Selection contrast
| P/N | Gas | Range | Principle |
|---|---|---|---|
| SPXCDASMCX | CO | 0-300ppm | EChem |
| SPXCDASMHX | H₂S | 0-50ppm | EChem |
| SPXCDASMO1 | O₂ | 0-25.0%Vol | EChem |
| SPXCDASMG1 | H₂ | 0-1000ppm | EChem |
| SPXCDALMCX | CO | 0-300ppm | EChem |
| SPXCDULNCX | CO | 0-300ppm | EChem |
Installation and wiring
Wall-mount SPXCDASMCX (carbon monoxide, 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 SPXCDASMCX. Land SPXCDASMCX 4–20 mA as three-wire and set Modbus address from the menu only. Magnetic wand calibration on the SPXCDASMCX lid stays non-intrusive. On SPXCDASMCX hold CO at breathing height on the downwind wall.
FAQ
- SPXCDASMCX: Is the 0–300 ppm CO range field-adjustable?
- SPXCDASMCX — Yes, the user FSD window is 100–1000 ppm in 100 ppm steps. Leave 300 ppm for occupied rooms; lift FSD only if a process vent can exceed that.
- SPXCDASMCX: Will hydrogen interfere with the CO cell?
- SPXCDASMCX — Short H₂ transients can read as CO. If the room also handles hydrogen, add a dedicated G1 point rather than relying on this CX cell alone.
- What weight penalty does 316SS add on SPXCDASMCX?
- SPXCDASMCX is ~6.8 lb versus ~4.4 lb for aluminium sibling SPXCDALMCX. The extra mass buys chloride resistance for this carbon monoxide point; keep M8 wall bolts at the stamped size.
- Can I convert SPXCDASMCX from ATEX M20 to NPT in the field?
- No. SPXCDASMCX flameproof entries are machined M20. North-American NPT is UL sibling SPXCDULNCX, not an adaptor on this ATEX carbon monoxide body.
- Can I retrofit Modbus on SPXCDASMCX after it ships?
- Modbus RTU on SPXCDASMCX is a transmitter sales option, not a jumper on the carbon monoxide 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 SPXCDASMCX or UL SPXCDULNCX rather than a dead SKU.