Method and apparatus for measuring crucible level of molten meta

Details Method and apparatus for measuring crucible level of molten meta Method and apparatus for measuring crucible level of molten meta

1981-10-13

1984-05-01

Envall, Jr., Roy N.

Industrial electric heating furnaces

Induction furnace device

For furnace regulating

73149, 73290R, H05B 504

Patent

active

044465629

ABSTRACT:
Improved and simplified measurement of the level of molten metal in a crucible heated by an induction coil utilizes a variable frequency power supply for the induction coil. Power supply frequency is changed to maintain the power provided to the coil substantially constant, independent of variations of power factor in the coil circuit. Detection of the frequency of power supplied to the induction coil provides an indication of the changes in power factor of the coil due to changes in the level of molten metal surrounded by the coil, and thus of the level of the molten metal.

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