The OSI-RE-SS is actually a reflector- sort linear optical beam smoke detector created to function being a ingredient of hearth alarm techniques. The beam operates primarily on the theory of light obscuration utilising an Infra-Pink beam. Beam smoke detectors may be a crucial part of the properly-intended computerized fireplace alarm https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/