The OSI-RE-SS is really a reflector- style linear optical beam smoke detector built to function to be a part of fireplace alarm programs. The beam operates totally on the principle of sunshine obscuration utilising an Infra-Red beam. OSI-R-SS is usually a 4-wire conventional reflector-form linear optical beam smoke detector for https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/