Molten-metal liquid level sensor

Details Molten-metal liquid level sensor Molten-metal liquid level sensor

1981-12-04

1984-01-31

Envall, Jr., Roy N.

Industrial electric heating furnaces

Electron beam furnace device

Vaporizing furnace

H01J 37305

Patent

active

044294018

ABSTRACT:
A level sensor for measurement of the level of molten metal in an electron beam evaporator which operates to sense directly the position of the point or line source of evaporant by detection of radiation such as light emitted therefrom. Compensation is provided for variations in electron beam deflecting magnetic field to avoid interpreting lateral movement of the point or line source from field variations as level changes. Compensation is also provided in the detection circuit for variations in detected light intensity that would otherwise provide an erroneous indication of level change. Detection of further conditions that produce unreliable level sensing and system inhibition in response thereto is provided as a safety feature.

REFERENCES:
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patent: 3519332 (1970-07-01), Kaiser
patent: 3531185 (1970-09-01), Buchsbaum
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patent: 3589797 (1971-06-01), Miller
patent: 3606523 (1971-09-01), Taylor et al.
patent: 4140393 (1979-02-01), Cetas
patent: 4262160 (1981-04-01), McKoon et al.

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