SICK GTB6-F7431V Photoelectric sensors. SICK GTB6-F7431V is a photoelectric sensors in the G6 family. SICK identifies this exact configuration as manufacturer article 1094259. The official technical record specifies Functional principle: Photoelectric proximity sensor; Functional principle detail: Background suppression; Sensing range max.: 5 mm ... 400 mm 1); Sensing range: 50 mm ... 220 mm; Light source: PinPoint LED 2); Type of light: Visible red light. The linked SICK data sheet is specific to GTB6-F7431V.