The OSI-RE-SS is usually a reflector- kind linear optical beam smoke detector made to function as a part of fireplace alarm methods. The beam operates primarily on the theory of light obscuration utilising an Infra-Crimson beam. Near/span> You cannot entry this page as this product or service just isn't out https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/