The OSI-RE-SS is really a reflector- sort linear optical beam smoke detector intended to run being a element of hearth alarm methods. The beam operates primarily on the basic principle of light obscuration utilising an Infra-Purple beam. OSI-R-SS is actually a 4-wire conventional reflector-kind linear optical beam smoke detector to https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/