Sick WL12-3P2431 Small Photoelectric Sensors

SICK’s vast range of WL12-3P2431 Small 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 Sick WL12-3P2431 Small Photoelectric Sensors is used in many automation applications around the world.


  • 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


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) Rectangular
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°
Wavelength 640 nm
Adjustment Potentiometer, 5 turns

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


Supply voltage 10 V DC … 30 V DC 1)
Ripple ≤ 5 Vpp 2)
Power consumption 30 mA 3)
Switching output PNP
Output function Complementary
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 III
Weight + 120 g
Polarisation filter
Housing material Metal
Optics material Plastic, PMMA
Enclosure rating IP66
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 light/dark ratio 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

For more info and price please contact


Rudy Wiratama

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