Sick WL12-3P2431 Small Photoelectric Sensors

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.


  • 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 principlePhotoelectric 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 range0 m ... 5 m 1)
Type of lightVisible red light
Light sourceLED 2)
Light spot size (distance)Ø 100 mm (3 m)
Angle of dispersionApprox. 1.5°
Wavelength640 nm
AdjustmentPotentiometer, 5 turns

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


Supply voltage10 V DC ... 30 V DC 1)
Ripple≤ 5 Vpp 2)
Power consumption30 mA 3)
Switching outputPNP
Output functionComplementary
Switching modeLight/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 frequency1,500 Hz 5)
Connection typeMale connector M12, 4-pin
Circuit protectionA 6)
C 7)
D 8)
Protection classIII
Weight+ 120 g
Polarisation filter
Housing materialMetal
Optics materialPlastic, PMMA
Enclosure ratingIP66
Items supplied2 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

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