Self diagnostic heat detector

Details Self diagnostic heat detector Self diagnostic heat detector

G - Physics

08

B

G08B 29/00 (2006.01) G01K 15/00 (2006.01) G08B 17/06 (2006.01) G08B 29/14 (2006.01)

Patent

CA 2206969

The present invention relates to an electronic heat detector having a self diagnostic mode. The heat detector is able to test the operation of a thermistor utilized for the temperature indicator of the heat detector. The thermistor is tested by applying electrical energy to the thermistor at a sufficient level for sufficient time to cause a measurable increase in the temperature of the thermistor. This level of increase of temperature of the thermistor is measured against an acceptable range for proper operation of the heat detector. The present invention also relates to a method for determining whether a heat detector is operating within acceptable limits, the heat detector utilizing a thermistor for temperature indication by the heat detector. The method comprises applying electrical energy to the thermistor at a sufficient level for sufficient time to cause a measurable increase in the temperature of the thermistor, and comparing the increase in temperature of the thermistor against an acceptable range for proper operation of the heat detector.

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