The OSI-RE-SS is really a reflector- variety linear optical beam smoke detector meant to operate like a part of fireplace alarm units. The beam operates primarily on the principle of light obscuration utilising an Infra-Crimson beam. Close/span> You can not accessibility this page as this merchandise isn't out there within https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/