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Small rectangular plastic sensor with red LED and M8 connector

Sick

Sick WTB4-3F2161 Miniature Photoelectric Sensor PNP

SKU CH-EF0X-TQASC

Miniature photoelectric sensor with background suppression detects small objects at 15 to 150 mm using a visible red PinPoint LED and PNP dark-switching output

  • Compact 16 x 39.5 x 12 mm housing fits tight spaces
  • PinPoint LED at 650 nm detects small objects to 150 mm
  • PNP dark-switching output responds in under 0.5 ms
  • IP67 and IP66 ratings withstand harsh environments
  • Operates from –40 °C to +60 °C on 10–30 V DC

Miniature Photoelectric Sensor for Precision

The Sick WTB4-3F2161 is a compact photoelectric proximity sensor that uses background suppression to detect small objects. Its rectangular housing measures 16 mm by 39.5 mm by 12 mm and weighs 30 g. The unit operates on 10 V DC to 30 V DC supply voltage and provides a PNP dark-switching output with a maximum current of 100 mA.

Simple M8 Connector Installation

Connection is made via a standard M8 3-pin connector that plugs directly into compatible cable assemblies. Sensitivity is set using a 5-turn potentiometer for fine-tuning the detection point. The IP67 and IP66 enclosure ratings protect against dust and water ingress, while built-in circuit protection guards against supply and output wiring errors.

150 mm Maximum Sensing Range

The sensor emits visible red light at 650 nm from a PinPoint LED, producing a 7 mm light spot at 50 mm distance. It reliably detects targets from 15 mm up to 150 mm with a response time under 0.5 ms and a 1,000 Hz switching frequency. This range determines suitability for close-range automation and small-part detection tasks.

Highlights

  • Compact 16 x 39.5 x 12 mm housing fits tight spaces
  • PinPoint LED at 650 nm detects small objects to 150 mm
  • PNP dark-switching output responds in under 0.5 ms
  • IP67 and IP66 ratings withstand harsh environments
  • Operates from –40 °C to +60 °C on 10–30 V DC

Specifications

BrandSICK
ModelSICK WTB4-3F2161

Questions about this item

How do I confirm the WTB4-3F2161 sensor is operating correctly after installation?

Align the visible red PinPoint LED spot on the target at 50 mm distance; the dark-switching PNP output should change state cleanly when the object enters the 15 mm to 150 mm sensing range.

What comes in the box with the WTB4-3F2161 and what must I source separately?

The sensor housing includes the M8 3-pin connector; you will need to supply a compatible M8 cable and a 10 V DC to 30 V DC power source.

Which sensing-range version of the WTB4-3F2161 should I select for detecting small parts at close distance?

This model provides a fixed 15 mm to 150 mm range with background suppression, suited for small-object detection at short distances.

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