Redundant level measuring system
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United States of America Patent
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Jan 31, 2017
Grant Date -
Feb 16, 2012
app pub date -
Aug 10, 2011
filing date -
Aug 10, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A redundant level measuring system comprises a chamber for fluidic coupling to a process vessel whereby material level in the vessel equalizes with material level in the chamber. A float including a magnet in the chamber rises and falls with material level in the chamber. A magnet actuated visual indicator is mounted to the chamber for indicating level of the magnet in the chamber. A measurement instrument includes an antenna and a measurement circuit. The instrument is mounted atop the chamber with the antenna extending downwardly into the chamber. The measurement circuit measures time of flight of a through air signal representing level of the material in the chamber. A shield in the chamber isolates the float from the antenna.
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