Sick UK 1041411 W12-3 rectangular photoelectric proximity sensor with metal housing. The WTB12-3P2431 sensor features PNP output type and light/dark switching mode. Reliable object due to superior ASIC (application-specific integrated circuit) technology and immunity to optical interference factors from the industrial environment. PinPoint LED technology provides a bright, small and precise light spot that enables quick and easy sensor alignment. PinPoint LED technology provides a bright, small and precise light spot that enables quick and easy sensor alignment. Wide range of products enclosed in a rugged metal housing enables application flexibility in a broad range of industrial environments. This sensor offer many advantages over conventional optical sensors due to their reliable object detection and monitoring capabilities. Whether in packaging, pharmaceutical, or the food and beverage industries, the W12 family provides a solution for any application.