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The JA-63S-100 detector combines an optical smoke sensor with a heat sensor. Both sensors digitally processed their outgoing signals, resulting in higher immunity against false alarms. The optical sensor works with a light diffusion principle and is very sensitive to the presence of large particles that are characteristic of dense smoke. In contrast, the sensor is less sensitive to small particles that are typical of bright burning fires. In particular, the smoke sensor is not capable of detecting the by-products of neatly burning liquids, such as alcohols. This shortage is compensated by the built-in heat sensor. This sensor gives a slower response compared to the smoke sensor, but is much better at responding to fires with fast rising heat that produces only a little smoke.