SICK GTB6L-P1211 Photoelectric sensors. SICK GTB6L-P1211 is a photoelectric sensors in the G6 family. SICK identifies this exact configuration as manufacturer article 1109656. The official technical record specifies Functional principle: Photoelectric proximity sensor; Functional principle detail: Background suppression; Sensing range min.: 10 mm; Sensing range max.: 400 mm; Adjustable switching threshold for background suppression: 30 mm ... 400 mm; Reference object: Object with 90% remission factor (complies with standard white according to DIN 5033). The linked SICK data sheet is specific to GTB6L-P1211.