Allen-Bradley 871T-L4B12 Inductive Proximity Sensor

The Allen-Bradley 871T-L4B12 Inductive Proximity Sensor is a 3-wire DC device designed for rugged non-contact metal detection in industrial automation. Encased in a stainless-steel barrel with a plastic face, this 12 mm diameter, unshielded sensor features a 4 mm sensing distance and a normally open, PNP source output, making it compatible with common NO input wiring in Rockwell Automation systems. It operates on a 10–30 V DC supply and uses a PVC cable-style lead for straightforward wiring in standard installations, supporting reliable switching in conveyors, presses, and other machinery where metal presence needs to be detected without direct contact. The compact tubular form factor and durable construction enable mounting in tight spaces while delivering consistent performance across typical industrial environments.