SICK GSE2F-F5121 Photoelectric sensors. SICK GSE2F-F5121 is a photoelectric sensors in the G2 family. SICK identifies this exact configuration as manufacturer article 1095453. The official technical record specifies Functional principle: Through-beam photoelectric sensor; Dimensions (W x H x D): 10 mm x 27 mm x 3.5 mm; Housing design (light emission): Rectangular; Minimum detectable object (MDO): 0.5 mm; Sensing range max.: 0 mm ... 200 mm; Sensing range: 0 mm ... 150 mm. The linked SICK data sheet is specific to GSE2F-F5121.