SICK GL6G-P4211 Photoelectric sensors. SICK GL6G-P4211 is a photoelectric sensors in the G6 family. SICK identifies this exact configuration as manufacturer article 1059632. 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.: 0.03 m ... 6 m 1); Sensing range: 0.07 m ... 5 m 1); Polarisation filter: Yes; Light source: PinPoint LED 2). The linked SICK data sheet is specific to GL6G-P4211.