Displacement servo gauge
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United States of America Patent
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May 7, 1991
Grant Date -
N/A
app pub date -
Jun 16, 1989
filing date -
Jun 16, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A level gauge is used on a tank containing a liquid. The gauge utilizes a displacer suspended on a support wire or tape which is wound on a storage wheel. The storage wheel is balanced by a counterweight. Any change in liquid level results in an imbalance which causes a servo motor to energize and rotate the wheel to bring the counterweight and displacer back into balance. The change in level is determined by counting the steps of motor operation. The changes in level are determined using the relationship between length and steps of motor operation. The level gauge is operable to continually correct calculation to compensate for changes in wire length per turn of the spool.
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