SICK WT24-2B420 Photoelectric sensors. SICK WT24-2B420 is a photoelectric sensors in the W24 family. SICK identifies this exact configuration as manufacturer article 1017885. The official technical record specifies Functional principle: Photoelectric proximity sensor; Functional principle detail: Background suppression; Dimensions (W x H x D): 27 mm x 87.5 mm x 65 mm; Housing design (light emission): Rectangular; Sensing range max.: 100 mm ... 2,500 mm 1); Sensing range: 100 mm ... 2,500 mm 1). The linked SICK data sheet is specific to WT24-2B420.