Electrode monitoring system

Details Electrode monitoring system Electrode monitoring system

1988-05-13

1989-04-04

Envall, Jr., Roy N.

Industrial electric heating furnaces

Glass furnace device

Joule effect heating

C03B 5027

Patent

active

048192481

ABSTRACT:
An apparatus and method for making electrical resistance measurements of individual powered electrodes within a glass heating furnace is disclosed. The powered electrodes are energized in pairs with electrical power supplied at a relatively low frequency, causing electrical currents flow between the pairs of powered electrodes through a pool of molten glass so as to generate heat therein. A single reference electrode is also provided within the furnace. Each of the powered electrodes is sequentially paired with the reference electrode to permit voltage and current measurements to be made. To accomplish such measurements, a relatively small high frequency electrical signal is supplied to the powered electrode, in addition to the relatively low frequency heating power supplied thereto. As a result, a measurement current flows between the selected powered electrode and the reference electrode. By selecting the high frequency measurement signal to be unrelated as a harmonic to the low frequency heating power, the effect of the heating power electrical signals on the measurement electrical signal can be greatly reduced. A current feedback circuit is provided to maintain a constant value for the high frequency measurement signal.

REFERENCES:
patent: 3176215 (1965-03-01), Kusko
patent: 3585267 (1971-06-01), Obersby
patent: 3634588 (1972-01-01), Steitz et al.
patent: 3984611 (1976-10-01), Varrasso
patent: 4063027 (1977-12-01), Varrasso et al.
patent: 4107446 (1978-08-01), Pieper
patent: 4293730 (1981-10-01), Myers

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