Overview
The Allen-Bradley 871TM-BH5N18-N3 is a rugged inductive proximity sensor built for extreme industrial conditions. Part of Rockwell Automation’s Bulletin 871TM line, this Series A sensor detects metallic objects without physical contact, making it ideal for automation control systems operating in corrosive, high-impact, or abrasive environments. The stainless steel construction with full epoxy encapsulation ensures long-term reliability where standard sensors fail.
Key Features
- 18mm diameter tubular housing with stainless steel construction
- Full mechanical seals and epoxy encapsulation for harsh-environment performance
- 5mm sensing distance for accurate metallic object detection
- 2-wire AC/DC operation (20–250V), PLC-compatible output
- Normally open output with Mini QD connector for quick installation
- Shielded design for reliable operation in electrically noisy environments
- UL, CE, C-TICK, and KC certified for global compliance
Technical Specifications
This sensor combines durability with precision sensing in demanding industrial settings. The 5mm sensing distance ensures reliable detection in confined spaces, while the AC/DC voltage flexibility supports integration into existing control systems.
Typical Applications
- Metal part detection and presence sensing in manufacturing
- Machine guard safety interlocks
- Bottle or container positioning on production lines
- Conveyor belt object counting and jam detection
- Food, beverage, and pharmaceutical processing equipment
- Aggressive chemical environments requiring corrosion resistance
Compatibility & Replacements
Compatible With
- Allen-Bradley PLCs (CompactLogix, ControlLogix, MicroLogix)
- All industrial control systems accepting 2-wire AC/DC sensors
- EtherNet/IP and DeviceNet networks via appropriate gateways
- Standard 24 VDC and 120/240 VAC industrial power supplies
Replaces / Drop-In Replacement For
- Previous Series versions of 871TM-BH5N18 (verify connector compatibility)
- Generic stainless steel 18mm inductive sensors with 5mm range (verify voltage and output specs)
Works With
- Studio 5000 and RSLogix 5000 programming environments
- Allen-Bradley COMPAX motion controllers
- 2-wire AC/DC sensing circuits and relay logic
- Standard industrial 24 VDC and 120/240 VAC control circuits
