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Title: Level indicator for pressure vessels

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.
Publication Date:
OSTI Identifier:
6612944
DOE Contract Number:
AI22-80PC30258
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; PRESSURE VESSELS; LEVEL INDICATORS; COAL LIQUEFACTION; CONTAINERS; LIQUEFACTION; MEASURING INSTRUMENTS; THERMOCHEMICAL PROCESSES 010405* -- Coal, Lignite, & Peat-- Hydrogenation & Liquefaction