The OSI-RE-SS is often a reflector- variety linear optical beam smoke detector intended to function as a ingredient of hearth alarm techniques. The beam operates primarily on the basic principle of sunshine obscuration utilising an Infra-Red beam. OSI-R-SS is often a 4-wire conventional reflector-kind linear optical beam smoke detector to https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/