Allen-Bradley 871TM-B8C18-A2 Inductive Proximity Sensor

Allen-Bradley, a Rockwell Automation brand, 871TM-B8C18-A2 inductive proximity sensor is a non-contact metal-detection device used to sense metallic targets in automated systems. It offers an 8 mm typical sensing range, a 3-wire DC output in normally open configuration (output type can be NPN or PNP depending on variant, commonly NPN NO), and a 4-pin micro Quick-Disconnect connection powered by 10–30 V DC. The 18 mm threaded cylindrical housing is IP67 protected for industrial dust and water exposure, and the unit includes LED indicators for power and output status with a high switching frequency for rapid detection. Typical applications include metal object detection and presence/position feedback in manufacturing automation, conveyor systems, packaging machinery, assembly lines, robotic cells, and material handling equipment; common replacements listed are Allen-Bradley 871TM-B8CP18-A2, Pepperl+Fuchs NBB8-18GM50-E2, and Sick IM18-02BPSZW1.