SICK GTB2S-E1331 Photoelectric sensors. SICK GTB2S-E1331 is a photoelectric sensors in the G2 family. SICK identifies this exact configuration as manufacturer article 1064354. The official technical record specifies Functional principle: Photoelectric proximity sensor; Functional principle detail: Background suppression; 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.: 1 mm ... 36 mm 1); Sensing range: 5 mm ... 30 mm 2). The linked SICK data sheet is specific to GTB2S-E1331.