SICK VS/VE18-4P3940 Through-beam photoelectric sensor. SICK VS/VE18-4P3940 is a archive in the V18 family. SICK identifies this exact configuration as manufacturer article 6013803. The official technical record specifies Functional principle: Through-beam photoelectric sensor; Dimensions (W x H x D): 18 mm x 18 mm x 75 mm; Housing design (light emission): Cylindrical; Housing length: 75 mm; Thread diameter (housing): M18 x 1; Optical axis: Radial. The linked SICK data sheet is specific to VS/VE18-4P3940.