Optical beam smoke detectors are specially appropriate for protecting properties with massive open Areas including warehouses, atriums etc. OSI-R-SS is really a four-wire conventional reflector-style linear optical beam smoke detector to be used in hearth alarm programs. The beam operates primarily on the principle of sunshine obscuration employing an infrared https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/