Excitation system for electromagnetic flowmeter
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United States of America Patent
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-
Mar 18, 1980
Grant Date -
N/A
app pub date -
Aug 21, 1978
filing date -
Aug 24, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A technique for exciting the electromagnet of a magnetic flowmeter in which a fluid to be metered is conducted through a flow tube having detecting electrodes, the fluid intercepting a magnetic field established by the electromagnet to induce a signal in the electrodes indicative of flow in a high flow-rate range as well as in a low flow-rate range. In this technique, derived from the electrode signal is a control signal whose frequency is a function of the velocity of the fluid passing through the tube, the excitation current supplied to the electromagnet being governed by the control signal so that it has a frequency which is higher in the high flow-rate range and lower in the low flow-rate range.
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