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