Patent ID: 6288638
Filing Date: 2001-09-11
Classification: G01K,G08B

Abstract:
A heat detector comprising:a control unit for comparing a detector voltage to a reference voltage and generating an alarm signal based on the magnitude of the detector voltage relative to the magnitude of the reference voltage, the control unit including a detector input terminal that receives the detector voltage;a temperature sensing component coupled to the detector input terminal, the resistance of the temperature sensing component being responsive to changes in temperature;a supply resistance coupled to the detector input terminal to form an upper leg of a voltage divider, a bottom leg of the voltage divider including the temperature sensing component, wherein the voltage divider generates the detector voltage and the detector voltage varies based upon the resistance of the temperature sensing component; anda testing circuit positioned in the upper leg of the voltage divider between the supply resistance and a voltage source, the testing circuit being operable to modify the detector voltage to simulate a change in temperature to test the heat detector.