SICK GL6L-P1211 Photoelectric sensors. SICK GL6L-P1211 is a photoelectric sensors in the G6 family. SICK identifies this exact configuration as manufacturer article 1109689. The official technical record specifies Functional principle: Photoelectric retro-reflective sensor; Sensing range min.: 0.08 m; Sensing range max.: 12 m; Maximum distance range from reflector to sensor (operating reserve 1): 0.08 m ... 12 m; Recommended distance range from reflector to sensor (operating reserve 2): 0.08 m ... 10 m; Reference reflector: Reflector P250F. The linked SICK data sheet is specific to GL6L-P1211.