Capacitive type electromagnetic flowmeter
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United States of America Patent
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-
Sep 4, 1990
Grant Date -
N/A
app pub date -
Aug 30, 1989
filing date -
Aug 31, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electromagnetic flowmeter in whose primary the fluid to be metered is conducted through a flow tube to intercept a composite magnetic field to induce therein a voltage which is picked up by capacitive metering electrodes. The composite field is formed by a low-frequency comparison field having a long period on which is superimposed a high-frequency switching field having a short period. The voltage from the capacitive electrodes is fed by way of a high pass filter to the input amplifier of a secondary whose amplified output is analyzed to provide separate components, one originating from the comparison field and the other from the switched field. An output signal is produced in accordance with the time phasing of these components, after compensating for the signal loss experienced in the filter by the comparison field component by means of a compensation voltage derived from the switched field component.
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