The Omron E2BM18KN16WPB12MOMI is an M18 inductive proximity sensor from the E2B series, offering a 16 mm sensing distance in a non-flush mount configuration. It switches PNP normally open (NO) at up to 400 Hz, making it a solid choice for detecting ferrous targets through a non-metallic window or at a standoff. The 10-30 VDC supply range and 200 mA load current cover standard 24 VDC control circuits without extra conditioning.
The 16 mm sensing distance is the key number: it's the maximum rated detection range for a mild steel target, and it's achieved only with non-flush mounting (the sensor face extends past the surrounding metal). That means you need clearance around the barrel — about 3× the diameter (54 mm) of free space in the mounting surface to avoid derating the range. The brass nickel-plated barrel and IP67 rating let it handle washdown and coolant splash on machine tools or conveyor lines, though the pre-wired cable (2 m, typically) means you're committing to a fixed lead length rather than a quick-disconnect connector.