An 18 mm unshielded inductive sensor from Omron's E2B series, the E2B-M18KN16-WP-C1 2M provides a normally open NPN output when a ferrous target enters its 16 mm sensing field. The unshielded construction gives a longer sensing range than a shielded equivalent of the same diameter — 16 mm for this M18 body. The NPN output pulls the output line low when the target is detected; confirm that the downstream load or PLC input is configured for sinking logic.
Housing is cylindrical brass with an M18 metric thread, short body length. The 2 m PVC cable exits axially; plan cable routing inside the panel or junction box accordingly.