The OSI-RE-SS is often a reflector- type linear optical beam smoke detector created to run for a ingredient of fire alarm methods. The beam operates primarily on the theory of sunshine obscuration utilising an Infra-Purple beam. OSI-R-SS is really a 4-wire conventional reflector-style linear optical beam smoke detector to be https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/