SICK GL6-P0111S91 Photoelectric sensors. SICK GL6-P0111S91 is a photoelectric sensors in the G6 family. SICK identifies this exact configuration as manufacturer article 1101834. The official technical record specifies Functional principle: Photoelectric retro-reflective sensor; Functional principle detail: With minimum distance to reflector (dual lens system); Sensing range max.: 0.01 m ... 5 m 1); Sensing range: 0.01 m ... 4 m; Polarisation filter: Yes; Light source: LED 2). The linked SICK data sheet is specific to GL6-P0111S91.