Allen-Bradley 871D-BW2N524-N3 Cylinder Position Sensor

The Allen-Bradley 871D-BW2N524-N3 is an inductive, in-port cylinder position sensor designed for hydraulic or pneumatic cylinders. This 2-wire AC/DC sensor operates over a wide supply range (20–250 V) and provides a normally open output when a piston is within its 2 mm nominal sensing distance. It features a 52.4 mm probe length for deep port access and a shielded construction to minimize EMI, with a 3-pin AC Mini Quick Disconnect connection for straightforward field wiring. Ideal for end-of-stroke position sensing, it delivers reliable feedback for automated sequencing and safety interlocks in cylinder-focused automation setups. The unit’s compact form and rugged design make it well-suited for retrofit installs and tight-space installations where precise cylinder position information is required.