The Omron E3G-L31 is a diffuse-reflective photoelectric switch sensor with a sensing range of 50 to 200 mm. It uses an NPN output and operates on 10 to 30 VDC. The housing is stainless steel and PBT, rated IP67, with a pre-wired cable connection.
The 50 to 200 mm diffuse-reflective range means the sensor detects objects by the light reflected from the target itself — no separate reflector or receiver needed. The NPN output (sinking) is common in PLC input cards that expect a current-sinking signal; verify your controller's input type before wiring. The IP67 rating allows the sensor to be mounted in washdown areas or dusty environments without an additional enclosure. The pre-wired cable saves installation time but means the cable length is fixed — plan your conduit or cable routing accordingly.