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Small rectangular plastic sensor with M8 connector and potentiometer adjustment

Sick

Sick WTB4-3P2161 Miniature Photoelectric Sensor PNP

SKU CH-2EK5-HQS5Z

Miniature photoelectric sensor with background suppression, 15 mm to 150 mm sensing range, visible red PinPoint LED, PNP light-switching output, M8 3-pin connector, IP67 and IP66 rated.

  • Detects small objects with background suppression
  • PinPoint LED gives visible red 650 nm light
  • 10–30 V DC supply with PNP output
  • IP67 and IP66 rated for harsh environments
  • Operates from –40 °C to +60 °C

Sick WTB4-3P2161 Miniature Photoelectric Sensor

The Sick WTB4-3P2161 is a miniature photoelectric proximity sensor designed for industrial automation tasks. It uses background suppression to detect small objects reliably. The PNP switching output suits standard PLC input modules. Its compact rectangular housing fits tight machine spaces.

Practical Limits of 10-30 V DC Supply

The sensor operates only within a 10 V DC to 30 V DC supply range with ripple below 5 Vpp. A 3-pin M8 connector handles power and signal, requiring a matching cordset. Enclosure ratings IP66 and IP67 protect against water jets and temporary immersion. Operating temperature spans –40 °C to +60 °C.

150 mm Maximum Sensing Range

The adjustable sensing range reaches 15 mm to 150 mm using a 5-turn potentiometer. Visible red PinPoint LED produces a 7 mm light spot at 50 mm distance. Background suppression ignores objects beyond the set point. Switching frequency reaches 1,000 Hz with response time under 0.5 ms.

How it compares

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

Price $73.99
Cheaper than about 66% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameSICK
Model nameSICK WTB4-3P2161

Questions about this item

Which sensing range version should I choose for detecting small objects at close distance?

The sensor offers a maximum sensing range of 4 mm to 150 mm and a standard sensing range of 15 mm to 150 mm, both using background suppression for reliable small-object detection.

What does the 1,000 Hz switching frequency mean for my application?

A 1,000 Hz switching frequency allows the sensor to detect up to 1,000 objects per second, suitable for fast processes with a response time under 0.5 ms.

What does the M8 3-pin connector cap in practice?

The M8 3-pin connector carries the 10 V DC to 30 V DC supply and the PNP light-switching output rated at 100 mA maximum current.

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