Overview
The Allen-Bradley 871TM-B8N18-N3 is a tubular inductive proximity sensor built for industrial automation applications in demanding environments. This 2-wire AC/DC model features stainless steel construction and a non-shielded design with 8 mm sensing distance, making it ideal for metal detection tasks in corrosive, high-moisture, or impact-prone settings.
Key Features
- Tubular stainless steel housing resists impact, abrasion, and corrosion
- 18 mm barrel diameter with compact footprint for tight installations
- 8 mm sensing distance for precision object detection
- Normally open (N.O.) output for standard PLC/relay logic
- Full mechanical seals and epoxy encapsulation for harsh environment durability
- Mini QD (Quick Disconnect) connector for fast field replacement
Technical Specifications
- Construction: Tubular, stainless steel, metal face
- Diameter: 18 mm
- Sensing Distance: 8 mm (non-shielded)
- Input Voltage: 20–250 V AC/DC, 2-wire
- Output: Normally open (N.O.)
- Connection: Mini QD (Quick Disconnect)
- Shielding: Unshielded
- Series: 871TM (Series A)
Typical Applications
- Metal detection and part counting on manufacturing lines
- Proximity switching in food processing and beverage bottling
- Level sensing in chemical or pharmaceutical environments
- Position feedback for automated assembly and packaging machinery
- Harsh-environment monitoring where standard sensors fail
Compatibility & Replacements
Compatible With
- Allen-Bradley CompactLogix, ControlLogix, and MicroLogix PLC controllers
- RSLogix 500 and Studio 5000 programming environments
- Standard 24 VDC industrial control systems with dry contact inputs
- Any AC/DC relay or PLC module accepting 2-wire proximity sensor input
Replaces / Drop-In Replacement For
- Allen-Bradley 871TM-B5N18-N3 (upgrade with different sensing distance)
- Allen-Bradley 871TM-BH8N18-N3 (shielded variant)
- Other OEM 18 mm stainless inductive proximity sensors with 8 mm range
Works With
- RSLogix 5000 and Studio 5000 automation software
- Allen-Bradley firmware versions compatible with 871TM series sensors
- Dry-contact input modules and standard digital I/O channels
- 24 VDC auxiliary control circuits and safety relay logic
