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The JA-151ST consists of two independent detectors - an optical smoke detector and a heat detector. The optical smoke detector works on the principle of scattered light. It is very sensitive to large dust particles that are present in dense smoke. It is less sensitive to smaller particles generated by the combustion of liquids such as alcohol. Therefore, the fire detector also includes a built-in heat detector, which responds more slowly, but is better able to detect a fire that generates only a small amount of smoke.