SICK WTF4FD-22162220A00 Photoelectric sensors. SICK WTF4FD-22162220A00 is a photoelectric sensors in the W4 family. SICK identifies this exact configuration as manufacturer article 1109266. The official technical record specifies Functional principle: Photoelectric proximity sensor; Functional principle detail: Foreground suppression; Sensing range min.: 0 mm; Sensing range max.: 100 mm; Adjustable switching threshold for background suppression: 15 mm ... 100 mm; Reference object: Object with 90% remission factor (complies with standard white according to DIN 5033). The linked SICK data sheet is specific to WTF4FD-22162220A00.