Optical sensor, Comet series, polyurethane housing with 18mm diameter and flattened sides for additional mounting comfort, IP67, high vibration and shock resistance. The Comet series includes through-beam sensors, retro-reflective sensors, light sensors: with and without background suppression, simplified installation through: visible scanning beams, optional light or dark switching, short-circuit protection, optical crosstalk protection to closely mounted sensors, adjustable gain factor, optional connection of fiber optic light guides