Product Introduction and Purpose
The SICK WTB4-3P3161F20 is a photoelectric proximity sensor designed for reliable object detection, even in challenging industrial environments. This sensor is part of SICK’s miniature W4 family, which is known for its compact housing and excellent background suppression. It is especially suited for tight-space applications on packaging machines, assembly lines, and robotics.
🔹 Industry Context – Why the SICK WTB4-3P3161F20 Stands Out
In industrial automation, ensuring precise object detection is crucial for reducing downtime and improving productivity. The SICK WTB4-3P3161F20 is engineered with SICK’s cutting-edge PinPoint LED technology, offering a bright, sharply defined light spot that enhances detection accuracy on various materials and surfaces. This makes it a preferred choice for manufacturers aiming to boost sensor reliability and reduce false triggers.
🔹 Performance and Quality
With a sensing range of up to 120 mm, the WTB4-3P3161F20 performs with remarkable precision. It integrates background suppression to avoid detection of unwanted objects or reflections beyond the set switching distance. The rugged IP67-rated housing ensures durability in demanding conditions, including exposure to dust and moisture. This sensor supports fast response times and stable operation even with glossy or dark targets.
🔹 Key Features and Design Benefits – SICK WTB4-3P3161F20
Compact miniature housing ideal for limited-space installations
Advanced background suppression for accurate object detection
Bright, highly visible PinPoint LED for precise alignment
Easy installation with standard M8 connector
Reliable switching behavior regardless of object color or surface
Durable polybutylene terephthalate (PBT) housing
IO-Link compatible for smart diagnostics and parameter setting
🔹 Certifications, Compliance, and Compatibility
The SICK WTB4-3P3161F20 complies with CE standards and is RoHS compliant. Its compatibility with IO-Link makes it suitable for Industry 4.0 environments, supporting advanced diagnostics and remote configuration through industrial networks.
📊 Technical Specifications
| Parameter | Value |
|---|---|
| Sensing Range | 30 mm … 120 mm (adjustable) |
| Light Source | PinPoint LED, red light |
| Supply Voltage | 10–30 V DC |
| Switching Output | PNP, Light switching |
| Connection Type | M8 connector, 4-pin |
| Output Function | Normally Open (NO) |
| Housing Material | Plastic (PBT) |
| Operating Temperature | –25 °C to +55 °C |
| Protection Class | IP67 |
| Response Time | <1 ms |
| Adjustment | Teach-in (pushbutton/manual) |
| Dimensions | ~32 x 12 x 20 mm (HxWxD) |
🔧 Product Attributes
Brand: SICK
Model Number: WTB4-3P3161F20
Sensor Type: Photoelectric proximity sensor
Output Type: PNP
Technology: Background suppression
Light Source: Red LED (PinPoint)
Connection Type: M8, 4-pin connector
Housing Material: PBT plastic
Protection Rating: IP67
Mounting: Through-hole or bracket mount
Compliance: CE, RoHS
Interface: IO-Link




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