The OSI-RE-SS is a reflector- sort linear optical beam smoke detector meant to operate like a element of hearth alarm programs. The beam operates totally on the theory of sunshine obscuration utilising an Infra-Crimson beam. Close/span> You can not accessibility this site as this item is not really obtainable in https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/