The OSI-RE-SS is actually a reflector- sort linear optical beam smoke detector created to operate as being a component of hearth alarm units. The beam operates primarily on the principle of sunshine obscuration utilising an Infra-Crimson beam. Optical beam smoke detectors are uniquely suited to preserving structures with big open https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/