Thermal measuring and testing – Thermal calibration system
Patent
1998-06-03
2000-12-19
Bennett, G. Bradley
Thermal measuring and testing
Thermal calibration system
374179, 327512, G01K 1500, G01K 716
Patent
active
061619582
ABSTRACT:
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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Mi Zhexin
Rattman William
Bennett G. Bradley
Digital Security Controls Ltd.
Verbitsky G.
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