Overview
The Sick WT18-3P420S32 is a photoelectric proximity sensor from Sick’s W18-3 series, designed for dependable object detection under challenging industrial conditions. The WT18-3P420S32 features a 50–1000 mm sensing range, PNP output, no adjustment, and M12 4-pin male connector. These sensors are immune to ambient light, background reflections and light absorbing objects, making them a reliable sensor solution.
Key Features
- Background suppression photoelectric proximity sensor with rectangular housing design
- Infrared LED light source at 870 nm wavelength with 30 mm light spot size at 600 mm distance
- IP67 enclosure rating, operating temperature range –40 °C to +60 °C, response time < 700 µs
- M12 4-pin male connector with PNP output and ≤ 100 mA maximum output current
- Fixed range model with no potentiometer adjustment required
- Lightweight plastic ABS housing with PMMA optics and 40 g weight
Technical Specifications
Detailed sensor specifications include infrared detection technology optimized for industrial automation, motion control, and inspection applications where background suppression and ambient light immunity are critical.
Typical Applications
- Parts counting and detection on assembly lines
- Box and package detection on conveyor systems
- Quality control inspection and sorting
- Presence/absence detection in manufacturing automation
- Edge and level detection in industrial processes
- Position sensing in robotic and motion control systems
Compatibility & Replacements
Compatible With
- Industrial PLC and automation systems supporting 10–30 V DC supply voltage
- Rockwell Automation ControlLogix and CompactLogix discrete input modules
- Siemens S7-1200, S7-1500, and analog input cards accepting PNP sensor signals
- Mitsubishi FX and Q-series PLCs with standard digital input cards
- Omron and Schneider Electric controllers with 24 V DC discrete input capacity
- Standard industrial control systems requiring M12 A-coded connectors
Replaces / Drop-In Replacement For
- Sick WT18-3P420S22 (alternative with adjustable potentiometer)
- Sick WT18-3P420S25 (alternative with 10–850 mm range variant)
- Generic photoelectric sensors in the W18-3 family with equivalent M12 connector and PNP interface
Works With
- M12 A-coded 4-pin connectors and standard industrial sensor cabling
- DC 10–30 V power supplies
- PNP switching logic interfaces in digital I/O modules
- IO-Link communication (compatible sensors in W18-3 series available)
- Standard industrial automation networks and control protocols supporting discrete inputs
