SICK WTB4-3F2161 Potentiometer

The SICK WTB4-3F2161 is a compact W4 family photoelectric sensor with background suppression (BGS) that detects small objects against cluttered backgrounds. It covers a sensing range from 4 to 150 mm with a switching distance of 15 to 150 mm and uses a visible red LED light source at 650 nm, producing a spot about 7 mm in diameter at 50 mm distance. Adjustment is via a 5-turn potentiometer, enabling precise threshold tuning for varying part sizes and reflectivity. An integrated yellow LED indicates the presence of the detected beam, while a green LED shows the supply voltage is active; mounting is via a threaded M3 hole and a standard electrical connection. The sensor is tested with targets featuring diffuse white reflectivity up to 90% (DIN 5033), making it suitable for detecting small parts on conveyors, in repetitive assembly tasks, or on packaging lines where background interference would otherwise cause misreads. The WTB4-3F2161 carries the 1028107 part number and is designed for the W4-series line of compact, background-suppressed photoelectric sensors, delivering reliable presence sensing in tight spaces.