Bulletin 871

The Allen-Bradley Bulletin 871 inductive proximity sensor family is a broad line of non-contact presence-detection devices covering tubular, flat-pack, ring, cylinder, and specialty form factors for industrial automation applications. The catalog number encodes critical selection data: the second letter identifies the form factor — C for nickel-brass tubular, T for stainless-steel tubular, TM for short-barrel stainless, F for flat-pack, and D for cylinder, among others — while the leading suffix letter designates electrical class (A/C for AC 2-wire, N for M-series DC). A numeric digit indicates nominal sensing distance in millimeters (2, 5, 8, 10, 15, 22, or higher), followed by N or P for NPN sinking or PNP sourcing output on DC models, a barrel-diameter code (12, 18, or 30 mm), and a trailing connection suffix such as -A2 (2 m PVC cable), -D4 (M12 micro QD), or -N3 (3-pin mini QD). Representative in-stock models include the 871C-A10C30-A2 (10 mm sensing, 30 mm plastic barrel, AC 2-wire, 2 m cable), the 871TM-BX22-H2 (short stainless barrel), and the 871TM-B10N30-A15 (10 mm sensing, 30 mm stainless barrel). Consult the Bulletin 871 Proximity Sensor Technical Data (PROX-TD001) for complete ratings and selection guidance.