The OSI-RE-SS is really a reflector- variety linear optical beam smoke detector built to work as a component of fire alarm methods. The beam operates primarily on the principle of light obscuration utilising an Infra-Crimson beam. Close/span> You can't obtain this webpage as this products just isn't out there inside https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/