The Omron E2A-M12LS04-M1-B1 is an inductive proximity sensor in the E2A family, current production, built for reliable metal target detection in tight spaces. M12 threaded barrel, flush-mounted, and rated IP67/IP69K so it handles washdown without second thought. PNP normally-open output at 12-24 VDC is the standard PLC input interface—no signal conditioning needed, just land the M12 connector and go.
4 mm sensing distance is the sweet spot for sensing small ferrous targets through a flush mount—no derating for shielded mounting, which saves panel space. The 0.2 A max operating current covers direct PLC input draw; you don't need an interface relay for a standard digital input. Thread length of 56 mm and overall 70 mm means the sensor protrudes just enough for a jam-nut install on a 12 mm hole. Stainless steel body resists corrosion and impact better than plated brass.