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Rectangular plastic sensor housing with M12 connector and potentiometer adjustment

Sick

Sick WTB27-3P2421 Photoelectric Proximity Sensor PNP

SKU CH-EZCJ-X35EN

Photoelectric proximity sensor with background suppression detects objects from 30 mm to 1,600 mm using 880 nm infrared LED and provides PNP complementary output

  • Background suppression enables precise detection up to 1,600 mm
  • Infrared LED with 880 nm wavelength suits industrial environments
  • PNP complementary output supports light and dark switching modes
  • IP69K enclosure rating withstands high-pressure washdown
  • Wide operating temperature from –40 °C to +60 °C

Industrial Photoelectric Proximity Sensor

The SICK WTB27-3P2421 is a rectangular photoelectric proximity sensor that uses background suppression to detect objects reliably. It operates on a 10 V DC to 30 V DC supply and draws 55 mA. The PNP complementary output switches at up to 350 Hz with a 1.5 ms response time. A 4-pin M12 male connector provides the electrical interface for automation systems.

Sensing Range and Infrared Performance

The sensor detects targets from 30 mm to 1,600 mm with a defined sensing range of 100 mm to 1,600 mm. An 880 nm infrared LED produces a 25 mm light spot at 800 mm distance. Potentiometer adjustment sets the switching threshold. The IP69K enclosure rating protects the ABS housing and PMMA optics against high-pressure wash-down and dust ingress.

Output Capacity and Environmental Limits

The PNP output delivers a maximum of 100 mA with a signal voltage of approximately supply minus 2.5 V for HIGH and 0 V for LOW. Circuit protection covers supply polarity, short-circuit and inductive load conditions. Operating temperature spans –40 °C to +60 °C while storage extends to +75 °C. The unit weighs 100 g and carries UL file numbers NRKH.E181493 and NRKH7.E181493.

How it compares

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Price $180.99
Pricier than about 75% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameSICK
Model nameSICK WTB27-3P2421

Questions about this item

What sensing range should I expect from the WTB27-3P2421 in my application?

The sensor detects from 100 mm up to 1,600 mm with background suppression, using an 880 nm infrared LED that produces a 25 mm spot at 800 mm distance.

How fast can the PNP complementary output switch in a real machine?

The output switches at up to 350 Hz with a 1.5 ms response time, delivering 100 mA maximum current and a signal voltage of supply minus 2.5 V for HIGH and 0 V for LOW.

What does the M12 4-pin connection cap in practice?

The M12 4-pin male connector carries the 10–30 V DC supply, the PNP complementary light/dark switching outputs, and circuit protection A, B and C within an IP69K-rated ABS housing.

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