Electromagnetic flowmeter of the residual magnetism type
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United States of America Patent
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Jul 22, 1986
Grant Date -
N/A
app pub date -
Apr 12, 1985
filing date -
May 16, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electromagnetic flowmeter has identical exciting coils coupled to portions which exhibit residual magnetism. A control circuit delivers short durations of current to each coil such that the current polarity in each coil determines the polarity of the magnetic flux across the conduit due to each residual magnetic portion. Four states of magnetic flux are repeatedly produced, zero, of one polarity, zero and of the other polarity. Flow note is determined by the difference between sampled voltages in a zero state and a directly succeeding state to eliminate noise components.
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