The OSI-RE-SS is usually a reflector- form linear optical beam smoke detector created to work like a ingredient of fire alarm units. The beam operates primarily on the theory of sunshine obscuration utilising an Infra-Crimson beam. OSI-R-SS is really a four-wire conventional reflector-type linear optical beam smoke detector to be https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/