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Small rectangular plastic sensor with red LED and 2 m cable

Sick

Sick WTB8-N1111 Photoelectric Proximity Sensor NPN

SKU CH-4P8M-CMTE9

Detects objects 20 mm to 100 mm away using visible red light with background suppression and NPN output

  • Photoelectric proximity sensor with background suppression for precise detection
  • Sensing range from 20 mm up to 100 mm using visible red LED
  • NPN output with selectable light or dark switching via rotary switch
  • IP67 rated plastic housing withstands dust and water ingress
  • Operates reliably from –25 °C to +55 °C ambient temperature

Industrial proximity sensor

The SICK WTB8-N1111 is a rectangular photoelectric proximity sensor designed for industrial automation tasks. It uses visible red LED light with background suppression to detect objects at distances between 20 mm and 100 mm. The NPN switching output suits standard PLC input modules.

Sensing range and output limits

The sensor operates on a 10 V DC to 30 V DC supply with a maximum ripple of 10 %. Output current is capped at 100 mA and the switching frequency reaches 1,000 Hz. Response time is 0.5 ms and the light spot measures 6 mm at the maximum 100 mm distance.

Installation notes and common issues

A stainless steel mounting bracket is supplied for quick installation on 11 mm wide profiles. The 2 m PVC cable uses a three-wire connection. The IP67 enclosure rating protects against dust and temporary immersion, while the operating temperature spans –25 °C to +55 °C.

How it compares

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

Price $175.99
Pricier than about 74% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameSICK
Model nameSICK WTB8-N1111

Questions about this item

Should I pick the 5 mm minimum or the 20 mm minimum sensing range for my setup?

The sensor detects from 5 mm to 100 mm maximum range, while the specified sensing range is 20 mm to 100 mm. Choose based on your required detection distance.

How does the 1000 Hz switching frequency affect real-world detection speed?

A 1000 Hz switching frequency means the sensor can change state up to 1000 times per second, with a response time of 0.5 ms for fast object detection.

What does the NPN output with 10 V to 30 V DC supply mean for my wiring?

The NPN output switches the load to ground, operating on 10 V DC to 30 V DC with a maximum output current of 100 mA and signal voltage below 1.8 V.

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