XPA-HT-11170-APO Xpander Heat Detector (A1R)XPA HT 11170 APO Xpander Heat Detector (A1R) The XPander Heat Detector utilises an open web casing which allows air to flow freely across a thermistor which measures the air temperature every 2 seconds. Its microprocessor uses algorithms to determine how fast the temperature is increasing and thus be detected at an earlier stage than with a static detector. A rate of rise detector is generally preferred to a static heat detector, unless sharp
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