Flow meter with magnetoresistive sensors and method of measuring flow
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United States of America Patent
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Oct 31, 2006
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N/A
app pub date -
Mar 22, 2005
filing date -
Mar 22, 2005
priority date (Note) -
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Abstract
A variable area flow meter has a magnet carried by a piston which is moved to a position representing fluid flow. An array of magnetoresistive bridge sensors adjacent the path of magnet movement senses the magnet position. The bridges are unbalanced by the magnet field. The analog unbalance signals are read and processed in digital form to develop a flow signal. The flow meter circuits are powered from a 4 20 MA current loop or a remote power supply. Each bridge sensor is powered only when the bridge unbalance signal is being read, to minimize the power requirement.
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