Sick WL12-3P2431 Small Photoelectric Sensors

SICK's vast range of photoelectric sensors offers precise optics and advanced technology, creating market-leading solutions with sensor intelligence. By using the latest SIRIC® and LED technologies, these sensors offer the highest level of operational reliability regardless of any interference factors. Additional sensor information can be used to simplify modern production processes.

This extensive range of photoelectric sensors is used in many automation applications around the world.

Feature :

  • Sensing range max.: 0 m ... 7 m
  • Sensor principle: Photoelectric retro-reflective sensor
  • Detection principle: Autocollimation
  • Switching output: PNP
  • Connection type: Male connector M12, 4-pin
  • Adjustment: Potentiometer, 5 turns

Specification :

Sensor/ detection principle

Photoelectric retro-reflective sensor, autocollimation

Dimensions (W x H x D)

15.6 mm x 48.5 mm x 42 mm

Housing design (light emission)


Sensing range max.

0 m ... 7 m 1)

Sensing range

0 m ... 5 m 1)

Type of light

Visible red light

Light source

LED 2)

Light spot size (distance)

Ø 100 mm (3 m)

Angle of dispersion

Approx. 1.5°


640 nm


Potentiometer, 5 turns

Reflector PL80A.
2) Average service life: 100,000 h at TU = +25 °C.

Mechanical/electronics :

Supply voltage

10 V DC ... 30 V DC 1)


≤ 5 Vpp 2)

Power consumption

30 mA 3)

Switching output


Output function


Switching mode

Light/dark switching

Signal voltage PNP HIGH/LOW

> Uv - 2,5 V / ca. 0 V

Output current Imax.

100 mA

Response time

≤ 330 μs 4)

Switching frequency

1,500 Hz 5)

Connection type

Male connector M12, 4-pin

Circuit protection

A 6)
C 7)
D 8)

Protection class



+ 120 g

Polarisation filter

Housing material


Optics material

Plastic, PMMA

Enclosure rating


Items supplied

2 x clamps incl. screws

Ambient operating temperature

–40 °C ... +60 °C

Ambient storage temperature

–40 °C ... +75 °C

UL File No.

NRKH.E181493 & NRKH7.E181493

1) Limit values when operated in a short-circuit protected network: max. 8 A.
2) May not exceed or fall below Uv tolerances.
3) Without load.
4) Signal transit time with resistive load.
5) With a light/dark ratio of 1:1.
6) A = VS connections reverse-polarity protected.
7) C = interference suppression.
8) D = outputs overcurrent and short-circuit protected.

Download Datasheet: Sick WL12-3P2431 Photoelectric Sensors

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