Allen-Bradley 875CP-D20NP30-A2 Capacitive Proximity Sensor

The Allen-Bradley 875CP-D20NP30-A2 Capacitive Proximity Sensor is a 30 mm‑diameter, threaded cylindrical switch with a plastic face and plastic barrel, delivering a 5–20 mm nominal sensing range for dielectric targets in automation environments, and it uses a 3‑wire DC connection with a PNP normally‑open output. The device is unshielded and ships with a PVC cable, and the sensing distance can be adjusted via a twenty‑turn potentiometer located on the rear of the housing to tailor response for different target sizes and mounting distances. In typical applications, it detects non‑metallic materials such as plastics and other dielectric substances behind containers or within packaging lines, where metal sensors would be impractical, and its compact plastic construction helps minimize interference in tight spaces. As part of Rockwell Automation's 875CP family, this model combines reliable capacitive sensing with a DC 3‑wire interface, making it suitable for integration into standard PLC I/O networks.