SICK GRSE18-P2442 Photoelectric sensors. SICK GRSE18-P2442 is a photoelectric sensors in the GR18 family. SICK identifies this exact configuration as manufacturer article 1066573. The official technical record specifies Functional principle: Through-beam photoelectric sensor; Dimensions (W x H x D): 18 mm x 18 mm x 73.5 mm; Housing design (light emission): Cylindrical; Thread diameter (housing): M18 x 1; Optical axis: Axial; Sensing range max.: 0 m ... 15 m. The linked SICK data sheet is specific to GRSE18-P2442.