The OSI-RE-SS is often a reflector- style linear optical beam smoke detector made to function being a ingredient of fireplace alarm systems. The beam operates primarily on the principle of light obscuration utilising an Infra-Crimson beam. OSI-R-SS can be a 4-wire conventional reflector-type linear optical beam smoke detector to be https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/