SICK WL4S-3E2132V Photoelectric sensors. SICK WL4S-3E2132V is a photoelectric sensors in the W4 family. SICK identifies this exact configuration as manufacturer article 1046435. The official technical record specifies Functional principle: Photoelectric retro-reflective sensor; Functional principle detail: Without reflector minimum distance (autocollimation/coaxial optics); Sensing range max.: 0 m ... 5 m 1); Sensing range: 0 m ... 3 m 1); Polarisation filter: Yes; Light source: PinPoint LED 2). The linked SICK data sheet is specific to WL4S-3E2132V.