Overview
The Allen-Bradley 872C-G12N18-R3 inductive proximity sensor is a compact, industrial-grade sensing device designed for metal detection in confined spaces. Part of the WorldProx sensor family, this 872C-G12N18-R3 unit offers a 12 mm sensing range in a compact 18 mm barrel form factor, making it suitable for applications where space is at a premium.
Key Features
- Non-shielded design — Provides extended sensing range and stable operation in typical industrial environments
- 2-wire AC operation — Simplifies wiring and reduces component count versus 3-wire sensors
- Normally open (NO) output — Standard switching configuration for machine control and alarm circuits
- Micro quick-disconnect connector — Enables fast plug-and-play installation and field replacement
- Nickel-plated brass body — Corrosion-resistant construction suitable for wet and wash-down environments
- Industrial certifications — UL, CUL, and KC approved for North American deployment
Technical Specifications
- Operating Voltage: 20 to 250 VAC
- Output Current: 300 mA maximum
- Sensing Distance: 12 mm
- Barrel Diameter: 18 mm
- Barrel Type: Standard (unshielded, extended)
- Output Configuration: Normally Open (NO)
- Connection Type: Micro Quick-Disconnect (AC)
- Material: Nickel-plated brass
- Detection Type: Inductive (ferrous and non-ferrous metals)
- Certifications: UL, CUL, KC
- Weight: 0.17 lbs
- UPC: 612598753888
Typical Applications
The 872C-G12N18-R3 is well-suited for:
- Machine tool automation — Part presence detection, workpiece positioning
- Conveyor systems — Product counting, jam detection, speed sensing
- Assembly lines — Cylinder position feedback, gate/door position monitoring
- Packaging equipment — Bottle/container presence, orientation verification
- Hydraulic/pneumatic circuits — Rod position sensing, actuator stroke verification
- Material handling — Pallet detection, load verification
Compatibility & Replacements
Compatible With
- Allen-Bradley ControlLogix and CompactLogix PLCs (via discrete analog I/O modules)
- Rockwell Automation compact I/O terminals and distributed I/O nodes
- Industrial control systems requiring 20–250 VAC proximity input sensing
- Pneumatic and hydraulic control circuits (as position feedback sensor)
- Standard 24 VDC machine control relays and solenoid drivers
- EtherNet/IP gateway modules with discrete I/O support
Replaces / Drop-In Replacement For
- 872C-G12N18-R3 (OEM direct replacement)
- Verify specific mechanical and electrical compatibility with your system integrator before ordering alternate models
Works With
- Control platforms: Allen-Bradley Studio 5000, RSLogix 500, FactoryTalk systems
- Communication protocols: Discrete hardwired I/O; integrates with EtherNet/IP via I/O modules
- Connector standards: Micro QD (quick-disconnect) AC-rated connectors
- Industrial automation software: FactoryTalk View, TwinCAT, and legacy Allen-Bradley platforms supporting discrete analog sensors
