Overview
The Sick WTR2-N551S06 is a photoelectric proximity sensor engineered for dependable operation in industrial automation and motion control systems. As part of Sick’s ZoneControl family, this sensor combines infrared LED technology with background suppression to eliminate false triggers from ambient light and reflective surfaces. The WTR2-N551S06 delivers consistent, precise detection for material handling, packaging, and assembly applications where reliability is critical.
Key Features
- Infrared LED light source for stable, ambient-light-independent operation
- ZoneControl background suppression technology reduces false triggers
- Potentiometer adjustment for easy range calibration in the field
- PNP switching output for direct integration with industrial controllers
- Compact form factor (18 mm × 99.5 mm × 46 mm) fits tight mounting spaces
- DC supply voltage range supports multiple system architectures
Technical Specifications
- Sensing Range: 300–900 mm (adjustable via potentiometer)
- Light Source: Infrared LED
- Functional Principle: Photoelectric proximity sensor with background suppression
- Switching Output: PNP
- Switching Mode: Dark switching (object detection)
- Supply Voltage: 10–30 V DC
- Current Consumption: Typical 25 mA
- Supply Ripple: <5 Vpp
- Light Spot Size: Ø 40 mm at 900 mm distance
- Dimensions (W × H × D): 18 mm × 99.5 mm × 46 mm
- Weight: Approximately 2.0 lb (0.91 kg)
- LED Service Life: 100,000 hours at +25 °C
Typical Applications
The Sick WTR2-N551S06 is commonly deployed in:
- Material handling and conveyor systems
- Packaging and labeling equipment
- Assembly line automation
- Position detection for pneumatic and hydraulic actuators
- Quality control and counting applications
- Mobile robot and AGV navigation
Compatibility & Replacements
Compatible With
- Industrial PLC controllers with 10–30 V DC input power
- Proportional and servo valve systems
- Automation systems requiring PNP switching logic
- Motion control systems in OEM equipment
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering, as sensor substitution depends on exact mounting, electrical, and optical specifications. Related models in the WTR2 series (such as WTR2-P521S09) share similar form factors and electrical characteristics but may require validation for your specific application.
Works With
- Sick ZoneControl photoelectric sensor software and configuration tools
- Standard PNP input modules on industrial PLCs (Allen-Bradley, Siemens, Mitsubishi, Omron)
- 24 V DC industrial control circuits
- Modular I/O systems with discrete input cards
