SICK WTB26I-24861421A00 Photoelectric sensors. SICK WTB26I-24861421A00 is a photoelectric sensors in the W26 family. SICK identifies this exact configuration as manufacturer article 1126768. The official technical record specifies Functional principle: Photoelectric proximity sensor; Functional principle detail: Background suppression; Sensing range min.: 30 mm; Sensing range max.: 3,000 mm; Adjustable switching threshold for background suppression: 180 mm ... 3,000 mm; Reference object: Object with 90% remission factor (complies with standard white according to DIN 5033). The linked SICK data sheet is specific to WTB26I-24861421A00.