SICK WL4SLG-3F2234 Photoelectric retro-reflective sensor. SICK WL4SLG-3F2234 is a archive in the W4 family. SICK identifies this exact configuration as manufacturer article 1058244. 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 ... 4.5 m 1) 2); Sensing range: 0 m ... 2 m 1) 2); Polarisation filter: Yes; Light source: Laser 3). The linked SICK data sheet is specific to WL4SLG-3F2234.