Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1989-09-20
1992-01-14
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
G01F 160
Patent
active
050799576
ABSTRACT:
A magnetic flowmeter generates an alternating potential representing flow. A controlled current excites the flowmeter with first and second amplitudes of current. A correction output represents the first and second amplitudes. A circuit connected to the correction output and the alternating potential oscillates at a frequency representing the alternating potential corrected for variation of the first and second amplitudes. Frequencies of the oscillations at first and second amplitudes are measured. An output is calculated as a function of a subtraction of the first and second measured frequencies such that the effect of offset is reduced.
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Rosemount Inc.
Ruehl Charles A.
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