Dual priority temperature control

Details Dual priority temperature control Dual priority temperature control

1977-06-24

1979-02-06

Goldberg, Elliot A.

Electric heating

Heating devices

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

219497, 307 41, 307 38, 219492, H05B 302

Patent

active

041386078

ABSTRACT:
A temperature control system controls operation of two heaters, such as the solution heater and dryer heater of a photographic processor. First and second temperature detectors sense temperature and provide first and second detector signals, which are compared with first and second reference ramp signals by first and second comparators. The comparators produce first and second inhibit signals, which prevent power from being supplied to the first and second heaters, respectively. A priority circuit prevents power from being supplied to the second heater if the first heater is receiving power.

REFERENCES:
patent: 3426259 (1969-02-01), Ziehm
patent: 3768545 (1973-10-01), Wills
patent: 3795817 (1974-03-01), Chambaut
patent: 3842243 (1974-10-01), Gregory

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