SICK WTB4FP-2216D250A00 Photoelectric sensors. SICK WTB4FP-2216D250A00 is a photoelectric sensors in the W4 family. SICK identifies this exact configuration as manufacturer article 1120899. The official technical record specifies Functional principle: Photoelectric proximity sensor; Functional principle detail: Background suppression, MultiSwitch, NarrowBeam, distance value; Sensing range min.: 4 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 WTB4FP-2216D250A00.