SICK GL2S-N2311 Photoelectric sensors. SICK GL2S-N2311 is a photoelectric sensors in the G2 family. SICK identifies this exact configuration as manufacturer article 1067404. The official technical record specifies Functional principle: Photoelectric retro-reflective sensor; Functional principle detail: With minimum distance to reflector (dual lens system); Dimensions (W x H x D): 7.7 mm x 21.8 mm x 13.5 mm; Housing design (light emission): Rectangular; Sensing range max.: 0.02 m ... 3 m 1); Sensing range: 0.03 m ... 2.5 m 1). The linked SICK data sheet is specific to GL2S-N2311.