SICK VSE18L-4P324 Photoelectric sensors. SICK VSE18L-4P324 is a photoelectric sensors in the V18 family. SICK identifies this exact configuration as manufacturer article 6027931. The official technical record specifies Functional principle: Through-beam photoelectric sensor; Dimensions (W x H x D): 18 mm x 18 mm x 97.7 mm; Housing design (light emission): Cylindrical; Housing length: 97.7 mm; Thread diameter (housing): M18 x 1; Optical axis: Axial. The linked SICK data sheet is specific to VSE18L-4P324.