The OSI-RE-SS can be a reflector- variety linear optical beam smoke detector created to operate for a element of fireplace alarm techniques. The beam operates totally on the theory of sunshine obscuration utilising an Infra-Crimson beam. Optical beam smoke detectors are uniquely suited to guarding properties with massive open parts https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/