The OSI-RE-SS is often a reflector- variety linear optical beam smoke detector created to operate for a element of hearth alarm programs. The beam operates primarily on the theory of light obscuration utilising an Infra-Red beam. OSI-R-SS is actually a 4-wire conventional reflector-type linear optical beam smoke detector to be https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/