Frederick A Long

US Patent:

44477430, May 8, 1984

Filed:

Apr 28, 1982

Appl. No.:

6/372861

Inventors:

Vern E. Bean - Frederick MD
Frederick G. Long - Ijamsville MD

Assignee:

The United States of America as represented by the United States
Department of Energy - Washington DC

International Classification:

G01F 2312

US Classification:

307118

Abstract:

A liquid level monitor for tracking the level of a coal slurry in a high-pressure vessel including a toroidal-shaped float with magnetically permeable bands thereon disposed within the vessel, two pairs of magnetic field generators and detectors disposed outside the vessel adjacent the top and bottom thereof and magnetically coupled to the magnetically permeable bands on the float, and signal processing circuitry for combining signals from the top and bottom detectors for generating a monotonically increasing analog control signal which is a function of liquid level. The control signal may be utilized to operate high-pressure control valves associated with processes in which the high-pressure vessel is used.