Optical beam smoke detectors are especially appropriate for shielding properties with large open spaces for example warehouses, atriums etcetera. OSI-R-SS is often a 4-wire conventional reflector-variety linear optical beam smoke detector for use in hearth alarm systems. The beam operates totally on the basic principle of light obscuration employing an https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/