The OSI-RE-SS is really a reflector- variety linear optical beam smoke detector built to work to be a component of fire alarm methods. The beam operates primarily on the principle of light obscuration utilising an Infra-Crimson beam. OSI-R-SS is really a four-wire conventional reflector-form linear optical beam smoke detector to https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/