The OSI-RE-SS is often a reflector- style linear optical beam smoke detector designed to operate as being a element of fire alarm techniques. The beam operates primarily on the principle of light obscuration utilising an Infra-Red beam. OSI-R-SS is often a 4-wire conventional reflector-type linear optical beam smoke detector to https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/