SICK ZTB18-APZ4B1D02 Photoelectric sensors. SICK ZTB18-APZ4B1D02 is a photoelectric sensors in the Z18 Simple Sense family. SICK identifies this exact configuration as manufacturer article 1100590. The official technical record specifies Functional principle: Photoelectric proximity sensor; Functional principle detail: Background suppression; Dimensions (W x H x D): 13.6 mm x 34.8 mm x 23 mm; Housing design (light emission): Hybrid; Thread diameter (housing): M18; Mounting system type: M18, head/side (24.1 … 25.4 mm). The linked SICK data sheet is specific to ZTB18-APZ4B1D02.