Optical beam smoke detectors are especially appropriate for shielding properties with big open Areas which include warehouses, atriums etc. OSI-R-SS is usually a four-wire conventional reflector-variety linear optical beam smoke detector to be used in hearth alarm units. The beam operates primarily on the basic principle of light obscuration employing https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/