The Omron E3FB-RP112M is a retroreflective photoelectric sensor from the E3FB series, sized in the familiar M18 threaded cylindrical body and delivering a 4 m sensing range with Mirror Surface Rejection (MSR). MSR filters out false reflections from shiny or mirror-like objects, so the sensor sees real targets instead of its own reflection bouncing back. That is the key reason to pick this variant over a standard retroreflective sensor: it handles polished metal, glossy packaging, or chrome surfaces without needing a polarizing filter add-on. Rated for 10-30 V DC supply, PNP output sinking up to 100 mA. Response time is fast at 0.5 ms, which keeps up with high-speed product flow on a conveyor. Sensing distance has a minimum of 100 mm and maximum 4 m; minimum object size is 7 mm diameter opaque. The switching mode is selectable between light-on and dark-on via wiring or connection, so you can choose either normally-open or normally-closed behavior without a separate selector. The 2 m pre-wired cable with bare wires simplifies connection to a PLC input module or a terminal block. No connector to source separately, just strip and terminate.
Common on packaging lines, material handling, and food & beverage equipment where the IP67/IP69K rating means it survives high-pressure washdowns. The brass body is tough for industrial environments. Mounts in a standard M18 threaded hole or bracket; overall dimensions are 18 mm diameter by 44 mm length. The straight face means the emitter and receiver point directly forward, so aim it like a flashlight at the reflector.