The OSI-RE-SS can be a reflector- sort linear optical beam smoke detector made to work being a element of fireplace alarm techniques. The beam operates primarily on the theory of light obscuration utilising an Infra-Purple beam. OSI-R-SS can be a four-wire conventional reflector-variety linear optical beam smoke detector to be https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/