SICK WTB12-3P2431 Through-Beam Photoelectric Sensor

The SICK WTB12-3P2431 is a compact W12-series through-beam photoelectric sensor that uses background suppression to detect objects from 20 mm to 350 mm away. It operates on 10–30 V DC and provides a three-wire PNP output with selectable DARK-ON or LIGHT-ON operation, making it straightforward to connect to standard PLC inputs. The emitter uses a 640 nm visible red LED and projects a focused Ø6 mm light spot at 200 mm, with sensing adjusted via a five-turn potentiometer. A yellow status LED indicates the received light beam to aid setup and diagnostics. The package includes two BEF-KH-W12 mounting clamps with screws for quick installation. This sensor is designed for industrial environments, offering long life with an average service life of up to 100,000 hours at 25 °C, and the WTB12-3P2431 variant is specified for reliable presence sensing within its stated range. The device supports both DARK-ON and LIGHT-ON modes, enabling flexible integration on automation lines, conveyors, and packaging applications where compact, non-contact detection is required. Its robust construction and defined optical parameters help ensure consistent performance across varying part colors and surface finishes within the 20–350 mm window. Part number 1041411 corresponds to this exact model, ensuring you’re getting the precise W12-3P2431 configuration from SICK.