The Siemens 3RG7641-0GA00 is a SIMATIC PXO220 M18S retro-reflective sensor with polarized optics, straight body, and a 3m sensing range. It runs on 10-30V DC, outputs NPN dark-on at 150mA, and comes with a 2m PUR cable (3x0.34mm²). The M18x52 threaded barrel and IP67 rating make it a direct swap for existing M18 mounts in washdown zones or dusty conveyor lines.
Polarized retro-reflective optics reject false triggers from shiny targets — critical on packaging lines with film or metal. The 3m range covers most conveyor and pallet-detection spans. NPN dark-on output means the load is energized when the beam is broken; verify your PLC input card sinks NPN before wiring. The 2m PUR cable is oil- and abrasion-resistant, good for drag chains or flexing cable trays.