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Small rectangular metal sensor housing with red indicator and M12 connector

Sick

Sick WL12-3P2431 Photoelectric Retro-Reflective Sensor PNP

SKU CH-YC7Q-EJS95

Compact retro-reflective photoelectric sensor with 7 m maximum range, PNP complementary output, and IP66/IP67/IP69K metal housing

  • Reliable detection up to 7 m with retro-reflective autocollimation
  • Compact 15.6 mm x 48.5 mm x 42 mm metal housing fits tight spaces
  • Visible red LED at 640 nm with 1.5° dispersion for precise alignment
  • Fast 330 µs response at 1,500 Hz switching frequency
  • IP66 IP67 IP69K enclosure rating withstands harsh environments

Industrial Detection Sensor

The Sick WL12-3P2431 is a compact photoelectric retro-reflective sensor designed for automation engineers and maintenance technicians who need reliable object detection in tight machine spaces. Its rectangular metal housing measures 15.6 mm by 48.5 mm by 42 mm and carries IP66, IP67 and IP69K enclosure ratings for harsh industrial environments.

Sensing And Output Constraints

The sensor operates on 10 V DC to 30 V DC supply voltage with a maximum sensing range of 7 m and a defined sensing range of 5 m using visible red light at 640 nm wavelength. A potentiometer with 5 turns allows adjustment, while the PNP complementary output switches at 1,500 Hz frequency with a 330 µs response time and 100 mA maximum output current.

Upgrade From Basic Proximity Switches

This unit replaces simple inductive or mechanical limit switches when non-contact detection over longer distances is required, especially where dust, water jets or temperature extremes from –40 °C to +60 °C would degrade lesser seals. The M12 4-pin connector and included clamps simplify retrofit installation on existing machinery.

Highlights

  • Reliable detection up to 7 m with retro-reflective autocollimation
  • Compact 15.6 mm x 48.5 mm x 42 mm metal housing fits tight spaces
  • Visible red LED at 640 nm with 1.5° dispersion for precise alignment
  • Fast 330 µs response at 1,500 Hz switching frequency
  • IP66 IP67 IP69K enclosure rating withstands harsh environments

Specifications

BrandSICK
ModelSICK WL12-3P2431

Questions about this item

How do I choose between the potentiometer adjustment and a fixed-range version of the WL12-3P2431?

The WL12-3P2431 includes a 5-turn potentiometer for manual sensitivity tuning, letting you set the exact switching point for your application.

What does the 7 m maximum sensing range mean when the sensor is mounted on a machine?

The sensor detects a reflector up to 7 m away; the rated 5 m range gives a reliable margin for dust, vibration or slight misalignment in daily operation.

What does the M12 4-pin connector cap in terms of signal speed and wiring?

The 4-pin M12 plug carries the PNP complementary output with a 330 µs response time, supporting up to 1 500 Hz switching frequency on a standard DC supply.

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