Optical beam smoke detectors are specially appropriate for defending structures with significant open spaces for example warehouses, atriums etcetera. OSI-R-SS is really a four-wire conventional reflector-sort linear optical beam smoke detector to be used in hearth alarm units. The beam operates primarily on the basic principle of light obscuration using https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/