SICK WTB9L-3P2261 Through Beam Photoelectric Sensor

The SICK WTB9L-3P2261 Through Beam Photoelectric Sensor is a laser-based, through-beam detector designed for reliable presence and position sensing on industrial lines. With a 650 nm laser light source and a sensing range of 25 to 300 mm, it can detect small parts and gaps with a clean, blocked-beam signal. The laser is Class 1 under IEC 60825-1, and the unit uses a 4-pin PNP output version while operating from a DC supply of 10–30 V; a 5-turn potentiometer provides precise on-site adjustment to suit varying target sizes and conveyor speeds. The yellow LED indicates the status of the received beam, enabling quick diagnostics on the factory floor. Built with a rugged housing rated IP66/IP67/IP69K, the WTB9L-3P2261 is designed for wash-down and harsh environments, and is well-suited to applications such as part presence checking, edge detection, and alignment verification on conveyors, packaging lines, and assembly stations. The model is part of SICK’s W9 family, known for compact form and dependable performance in tight spaces.