Overview
The Sick WT12L-2B550 photoelectric diffuse sensor delivers reliable background-suppressed detection for material handling, packaging, and industrial automation systems. Part number 1017904, this compact unit combines red laser sensing technology with robust M12 connectivity, making it a practical replacement for worn or failed proximity detection in existing installations.
Key Features
- Diffuse mode with background suppression (BGS) for consistent detection through minor contamination
- Adjustable potentiometer for sensing range fine-tuning and sensitivity control
- Dual output configuration: switchable PNP or NPN logic to match controller requirements
- Visible red laser (650 nm) for easy target alignment and focus verification
- IP67/IP69K sealed housing resistant to water, dust, and industrial washdown environments
- Compact rectangular profile (15 × 49 × 41.5 mm) fits tight mounting spaces
Technical Specifications
- Supply Voltage: 10–30 VDC (< 5 Vpp ripple)
- Output Current: 100 mA maximum at safe output
- Input Current: 55 mA typical (no load)
- Sensing Range: 30–200 mm (diffuse mode, 18% reflection standard)
- Reaction Time: 0.2 ms
- Switching Frequency: 2500 Hz
- Light Source: Laser, red unpolarized, 650 nm wavelength
- Switching Modes: Light switching or dark switching (via pin connection)
- Connector: M12 male, 5-pin coded connector
- Housing: Metal body with plastic (PMMA) optical window
- Dimensions: 15 mm (W) × 49 mm (H) × 41.5 mm (D)
- Weight: 130 g
- IP Rating: IP67 / IP69K
- Operating Temperature: −25 °C to +75 °C
- Average Service Life: 50,000 hours at +25 °C
Typical Applications
- Box and parcel detection on conveyor lines
- Sheet and film counting in print and packaging machinery
- Level sensing in bins and hoppers
- Part presence verification on assembly lines
- Material edge detection for web-fed processes
- Washdown-resistant machine guarding and interlocks
Compatibility & Replacements
Compatible With
- Allen-Bradley CompactLogix and ControlLogix I/O modules accepting 10-30 VDC digital inputs
- Siemens S7-1200 and S7-1500 controllers with 24 VDC input cards
- Mitsubishi FX and Q-series PLCs with discrete DC input terminals
- Omron CP and NX-series controllers supporting 12-24 VDC sensors
- ABB AC500 and PM600 controllers with analog/digital input modules
- Standard industrial 24 VDC power distribution panels and relay logic systems
Replaces / Drop-In Replacement For
- Sick WT12L-2B550A01 (variant with alternate connector coding)
- Other Sick W12 series diffuse sensors with M12 connection and 100 mA output rating
- Generic 30-200 mm diffuse laser proximity sensors requiring M12 M-code or similar industrial connector compatibility
Works With
- EtherNet/IP scanners and PROFINET-compatible I/O hubs via Industrial Ethernet gateways
- SICK S3000 remote I/O nodes and SICK safety controllers
- Studio 5000 Logix Designer (Allen-Bradley) discrete digital input modules
- TIA Portal (Siemens) sensor configuration and monitoring tools
- Standard 24 VDC industrial power supplies and regulated PSU circuits
- M12 female receptacles and Y-splitter connectors for multi-sensor branching
