SICK IQ12-04NPSKR8SS12 Inductive proximity sensors. SICK IQ12-04NPSKR8SS12 is a inductive proximity sensors in the IQB family. SICK identifies this exact configuration as manufacturer article 1121409. The official technical record specifies Housing: Rectangular; Dimensions (W x H x D): 12 mm x 40 mm x 26 mm; Sensing range S n: 4 mm; Safe sensing range S a: 3.24 mm; Installation type: Non-flush; Switching frequency: 2,000 Hz. The linked SICK data sheet is specific to IQ12-04NPSKR8SS12.