Optoelectronic sensors, proximity switches, frame light barriers, fork light barriers, yarn breakage detectors, light barriers, photoelectric switches, thru-beam sensors, retro-reflective sensors, diffuse sensors, laser barriers, distance control sensors, fibre-optic cables, fibre-optic amplifiers, light curtains, reflectors, ultrasonic sensors, ultrasonic barriers, inductive ringsensors, inductive proximity switches, capacitive proximity switches, cylinder switches, reed switches, safety light curtains, flow meters, air flow meters, metal separators, metal detectors, ring detectors