SICK WL12G-3B2531S37 Photoelectric Sensor 2 m

SICK WL12G-3B2531S37 is a compact retro-reflective photoelectric sensor in the WL12G family that uses autocollimation/coaxial optics for reliable detection of targets up to 2 m away with a defined working window of 0–0.5 m. It emits a visible red light at 640 nm and integrates polarization filters to improve sensing stability on reflective or translucent surfaces, especially when used with the PL80A reflector for detecting transparent objects. The sensor is powered from 10–30 V DC and provides NPN/PNP outputs via a 5‑pin M12 connector, with an 11‑turn potentiometer for sensitivity adjustment. Status indication includes a yellow LED for the received beam, a green LED for power/teach‑in, and a blue LED for the second teach‑in function, controlled by a single teach‑in button. With a 2 m cable length, the WL12G-3B2531S37 aligns with common WL12G configurations and supports long-term automation use, including a long service life—about 100,000 hours at +25 °C—and an MTTF of 823 years. The part is cataloged as 1044111, confirming its identity as the 2 m variant of SICK’s WL12G series suitable for compact mounting on conveyors, packaging lines, and other space‑constrained sensing tasks.