SICK WTB12-3N2431 Photoelectric Sensor

SICK WTB12-3N2431 is a compact 12 mm cylindrical photoelectric sensor in the W12 family that uses background suppression to reliably detect parts across a 20 to 350 mm sensing range with a visible red LED at 640 nm. It operates from 10 to 30 V DC and provides a 3-wire NPN (open-collector) output via a 4-pin M12 connector, with sensitivity tuned by a 5-turn potentiometer. The device ships with BEF-KH-W12 mounting clamps and is specified for targets with about 90% remission (DIN 5033), enabling consistent operation on standard industrial surfaces. The WTB12-3N2431’s compact 12 mm body and the red 640 nm emission support reliable sensing in tight spaces on conveyors, packaging lines, and inline automation tasks, including presence/absence checks, label verification, and edge detection. Background suppression helps ignore backdrops and clutter behind the target, reducing false triggers in busy production environments. Designed for industrial use, this sensor integrates with typical control systems via 3-wire NPN wiring and M12 connectivity.