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The SICK WTB4 Series (part of the elite W4, W4-3, and upgraded W4F miniature sensor portfolios) represents the global standard for photoelectric proximity sensors with advanced background suppression (BGS). Unlike standard diffuse sensors that can be fooled by changing background textures, shiny metallic panel linings, or operator clothing, the WTB4 focuses strictly on the exact distance threshold set by the user. Packed into a space-saving rectangular housing, it detects dark, glossy, multi-coloured, or small objects with absolute reliability.
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Key Specifications (WTB4-3P2161 Baseline Profile)
| Feature | Detail |
|---|---|
| Manufacturer Series | SICK AG (Germany) — W4 / W4-3 Product Range |
| Sensing Principle | Photoelectric Proximity Sensor with Background Suppression (BGS) |
| Sensing Distance Range | 4 mm to 150 mm max (Reliable window: 15 mm to 150 mm) |
| Light Source Type | High-precision Visible Red PinPoint LED (650 nm wavelength) |
| Light Spot Footprint | Approximately Ø 7 mm at a distance of 50 mm |
| Supply Input Voltage | 10 to 30 VDC (Includes reverse-polarity and ripple protection) |
| Output Current Max | 100 mA maximum load capability |
| Switching Frequency | Up to 1,000 Hz processing cycles |
| Response Signal Speed | Less than 500 μs latency transit time |
| Mechanical Dimensions | Ultra-compact block: 16 mm (W) x 39.5 mm (H) x 12 mm (D) |
| Enclosure Ingress Sealing | Rated to dual IP66 and IP67 standards |
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