SICK WTB4-3P3162S04 Photoelectric Proximity Switch

The SICK WTB4-3P3162S04 is a compact photoelectric proximity sensor from SICK’s WTB4 family that uses background suppression for reliable detection of small parts on conveyors, packaging lines, and tight-spot applications. It offers an adjustable sensing range from 4 to 150 mm, with a preset 60 mm option to simplify setup, and uses a PinPoint LED delivering visible red light at 650 nm with a light spot about 7 mm in diameter at 50 mm distance. Its supply is 10–30 V DC and it provides a PNP output for sourcing detection signals, with adjustment available via a single teach‑in button. The unit is rated IP67/IP66 for rugged industrial environments and is designed for high-contrast detection of objects with various surface finishes, including surfaces with up to 90% remission. The data sheet indicates a long service life, with an MTTFd (DC, average) of about 1,365 years, and highlights that background suppression helps avoid false positives from indirect reflections. Typical applications include small-part verification on packaging lines, electronics assembly, and other automated processes where precise detection of small objects against textured or cluttered backgrounds is required, benefiting operations that demand fast, reliable switching with minimal misdetection.