SICK WSE9L-3N2237 Photoelectric sensors. SICK WSE9L-3N2237 is a photoelectric sensors in the W9 family. SICK identifies this exact configuration as manufacturer article 1058179. The official technical record specifies Functional principle: Through-beam photoelectric sensor; Dimensions (W x H x D): 12.2 mm x 49.8 mm x 23.6 mm; Housing design (light emission): Rectangular; Mounting hole: M3; Sensing range max.: 0 m ... 60 m; Sensing range: 0 m ... 50 m. The linked SICK data sheet is specific to WSE9L-3N2237.