SICK GTB6-P7441S56 Photoelectric sensors. SICK GTB6-P7441S56 is a photoelectric sensors in the G6 family. SICK identifies this exact configuration as manufacturer article 1077541. The official technical record specifies Functional principle: Photoelectric proximity sensor; Functional principle detail: Background suppression; Sensing range max.: 5 mm ... 500 mm 1); Sensing range: 50 mm ... 450 mm; Light source: LED 2); Type of light: Infrared light. The linked SICK data sheet is specific to GTB6-P7441S56.