The OSI-RE-SS is often a reflector- variety linear optical beam smoke detector created to operate to be a part of fire alarm units. The beam operates totally on the principle of sunshine obscuration utilising an Infra-Crimson beam. OSI-R-SS is usually a 4-wire conventional reflector-style linear optical beam smoke detector to https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/