The OSI-RE-SS is actually a reflector- sort linear optical beam smoke detector designed to work to be a part of fireplace alarm methods. The beam operates totally on the theory of sunshine obscuration utilising an Infra-Crimson beam. OSI-R-SS is usually a 4-wire conventional reflector-variety linear optical beam smoke detector for https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/