Sick WTRA-P421 Photoelectric Sensor

The SICK WTRA-P421 Photoelectric Sensor with Pneumatic Valve is a zone-control device that combines a background-suppression photoelectric sensor with an integrated 3/2-way pneumatic valve for compact conveyor automation. The part number 1013260 belongs to the WTR1-P421 family and features a 300–900 mm sensing range, infrared LED illumination, and an ABS plastic housing sized 51.5 × 151.4 × 46 mm, weighing about 175 g. It operates on 21.6–27.6 V DC with less than 5 Vpp ripple and provides a PNP switching output in dark-switching mode; the built-in valve is a 3/2-way solenoid driven by a 24 V DC, 1 W coil, and daisy-chaining is supported via a cable with a female M12, 4-pin connector at 1.2 m. The unit offers potentiometer-adjusted sensing and supports up to roughly 30 sensors per zone, making it suitable for zone-control on roller conveyors where precise detection and synchronized actuation are essential.