Allen-Bradley 871C-D1NP8-D4 Inductive Proximity Sensor

The Allen-Bradley 871C-D1NP8-D4 is an inductive proximity sensor that detects metallic objects without contact, offering reliable position sensing in industrial environments such as conveyor systems, packaging machinery, and automated assembly equipment. As part of the 871C Series, it provides an 8 mm sensing distance with a PNP, normally open (3-wire DC typical) output and operates on 10–30 V DC, with connections available as M8 or micro quick-disconnect depending on model. The cylindrical threaded housing supports flush or non-flush mounting (model dependent) and carries industrial-grade IP-rated protection for use in dusty, oily, and vibratory conditions. Typical applications include automated production lines and material handling where non-contact metal detection is critical, and common replacements include Allen-Bradley 872C-D3NP8-D4, 872C-M8NP18-D4, and 871TM-DH5NP18-D4 proximity sensors.