The OSI-RE-SS is a reflector- form linear optical beam smoke detector designed to work like a component of hearth alarm techniques. The beam operates primarily on the theory of sunshine obscuration utilising an Infra-Red beam. Optical beam smoke detectors are uniquely suited to guarding buildings with large open up parts https://altbookmark.com/story20198224/how-much-you-need-to-expect-you-ll-pay-for-a-good-conventional-beam-detectors