Temperature controller having a controller breakage detector

Details Temperature controller having a controller breakage detector Temperature controller having a controller breakage detector

1990-06-29

1992-02-04

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219497, 219508, 219492, 361 90, H05B 102

Patent

active

050862120

ABSTRACT:
A temperature controller wherein breakage of a thermistor whose resistance decreases with increase in temperature of a member to be heated is detected by watching whether a voltage dependent upon the resistance of the thermistor is increased or not after a predetermined period of time. A heater for heating the member is turned off when the breakage of the thermistor is detected.

REFERENCES:
patent: 3878358 (1975-04-01), Barton et al.
patent: 4031352 (1977-06-01), Oosterberg
patent: 4736091 (1988-04-01), Moe
patent: 4926025 (1990-05-01), Wilhelm
patent: 4943706 (1990-07-01), Lyall et al.

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