What the device is
The XU5M18MB230 is a Telemecanique XU5-series diffuse (proximity) photoelectric sensor in an 18 mm tubular barrel, supplied under the Square D brand label. It is a 2-wire device terminated with a 2 m cable, with an overall body length of 82 mm and an IP67 sealed enclosure, so it mounts directly into standard M18 through-holes on a machine frame or bracket without further housings. The optical chain uses a PMMA lens behind a nickel-plated brass body with PVR insulation, which is the standard construction for washdown-adjacent conveyor and packaging lines.
Compliance and identification
The device carries UL, CSA, and CE approvals, with an IP67 enclosure rating for dust and water-jet exposure. The part is marked RoHS compliant; a Proposition 65 warning applies in California because the insulation system uses phthalate-based plasticizers (DINP, DIDP), which is a labelling requirement rather than a use restriction.
Sourcing posture
The XU5M18MB230 carries a current lifecycle stage and is specified into the BOM as a maintainable spare for existing XU5 diffuse installations. For replacements on running equipment, the exact order code is the right call — the 2-wire 24–240 VAC/VDC signature is shared across the XU5M18 family, but sensing distance and barrel options vary, so a generic 'M18 diffuse' cross is not a safe swap. Send quantity and required delivery window for an RFQ — supply is quoted to order against the specific order code rather than off the shelf.