The OSI-RE-SS can be a reflector- sort linear optical beam smoke detector designed to work like a component of fireplace alarm units. The beam operates totally on the basic principle of sunshine obscuration utilising an Infra-Crimson beam. Near/span> You can not access this webpage as this products isn't offered in https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/