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there are 3 detectors i can only think of 2 off the top of my head, there is a continuous fire wire which detects mainly heat and sets off the sensor if there is a break in the wire caused by melting,, so u may get a false fire indication from a hot start, there is also an infra-red detector which is more accurate as it can be used to detect actual flames,, the third detector is much like the continuos fire wire and only detects heat so again is not as accurate as the infra red.

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