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Small rectangular plastic sensor with potentiometer and M8 connector

Sick

Sick WTB4S-3P2161 Photoelectric Sensor PNP

SKU CH-NZDT-M3J5T

Miniature photoelectric sensor with background suppression detects objects from 4 mm to 180 mm using a visible red PinPoint LED and provides a PNP light-switching output up to 100 mA at 1,000 Hz

  • Miniature 12.2 mm x 41.8 mm x 17.3 mm housing fits tight spaces
  • Background suppression detects objects reliably at 10 mm to 180 mm range
  • Visible red PinPoint LED gives precise Ø 6.5 mm spot at 150 mm distance
  • PNP switching output handles 100 mA at 1,000 Hz frequency
  • IP67 and IP66 rated for harsh environments from –40 °C to +60 °C

Miniature Photoelectric Sensor

The Sick WTB4S-3P2161 is a rectangular proximity sensor that uses visible red PinPoint LED light to detect objects at 10 mm to 180 mm. It operates on 10 V DC to 30 V DC and provides a PNP light-switching output with a 100 mA maximum current. The ABS housing measures 12.2 mm by 41.8 mm by 17.3 mm and carries IP67 and IP66 enclosure ratings.

Upgrade from Basic Diffuse Sensors

Background suppression ignores objects beyond the set range, so reflective backgrounds no longer cause false triggers. The potentiometer with five turns lets you set the exact cut-off point, and the 0.5 ms response time supports fast production lines. The jump is worth it when a standard diffuse sensor cannot distinguish the target from a shiny or close background.

Suited for Tight Machine Frames

The M8 3-pin connector and 30 g weight simplify installation on compact equipment, while the –40 °C to +60 °C operating range handles cold storage and hot processes alike. Buyers who need longer sensing distances, analogue output, or a different mounting footprint should look at other sensor families.

How it compares

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

Price $74.99
Cheaper than about 65% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameSick
Model nameSICK WTB4S-3P2161

Questions about this item

What size M8 connector and how many pins does the WTB4S-3P2161 need?

The sensor uses a standard M8 3-pin connector for power and the PNP switching output.

Which adjustment do I turn to set the background suppression distance?

Turn the 5-turn potentiometer on the housing; clockwise increases the sensing range up to 180 mm.

How often should I clean the PMMA optics on this sensor?

Wipe the PMMA lens with a soft, dry cloth whenever dust or oil builds up; the IP67 housing tolerates occasional wash-down.

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