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Small rectangular plastic sensor with red LED and short M8 cable

Sick

SICK WTB4-3P3161 Miniature Photoelectric Sensor PNP

SKU CH-WQVC-X68GD

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

  • Miniature 16 x 39.5 x 12 mm housing fits tight spaces
  • Background suppression detects small objects reliably at 15-150 mm
  • PinPoint LED gives visible 650 nm red spot Ø 7 mm at 50 mm
  • PNP output switches at 1,000 Hz with < 0.5 ms response
  • IP67/IP66 rated, works from –40 °C to +60 °C

Miniature Photoelectric Sensor PNP

The SICK WTB4-3P3161 is a background-suppression photoelectric proximity sensor built for detecting small objects in tight machine spaces. It operates on 10 V DC to 30 V DC and provides a PNP light-switching output suitable for industrial automation tasks.

Rectangular ABS housing with IP66 and IP67 ratings

The rectangular plastic housing measures 16 mm by 39.5 mm by 12 mm and weighs 30 g. A 100 mm PVC cable terminates in a 3-pin M8 connector, allowing quick installation while the enclosure resists dust and temporary immersion in harsh environments.

Visible red PinPoint LED with 5-turn potentiometer

The 650 nm light source produces a 7 mm spot at 50 mm distance and covers a sensing range from 15 mm to 150 mm. Response time stays below 0.5 ms at 1,000 Hz switching frequency, limiting use to applications where this speed and range are sufficient.

How it compares

Measured against everything we stock in Electrical Trade Tools & Kits, at today’s prices. Recalculated every night.

Price $281.99
Pricier than about 85% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameSICK
Model nameSICK WTB4-3P3161

Questions about this item

What is the maximum sensing range of the WTB4-3P3161 sensor?

The sensor detects objects up to 150 mm away using background suppression and a visible red PinPoint LED.

What are the housing dimensions and mounting footprint?

The rectangular ABS housing measures 16 mm wide, 39.5 mm high and 12 mm deep, weighing 30 g.

How do I wire the M8 connector and set the sensing distance?

Connect the 3-pin M8 pigtail to a 10–30 V DC supply, then adjust the 5-turn potentiometer while the target is at the desired distance.

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