The OSI-RE-SS is actually a reflector- kind linear optical beam smoke detector built to function for a element of hearth alarm systems. The beam operates totally on the basic principle of light obscuration utilising an Infra-Pink beam. OSI-R-SS is often a 4-wire conventional reflector-variety linear optical beam smoke detector for https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/