Method for determining and/or monitoring a process variable of a medium, and corresponding apparatus
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United States of America Patent
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May 14, 2013
Grant Date -
Jun 24, 2010
app pub date -
Feb 13, 2008
filing date -
Feb 20, 2007
priority date (Note) -
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Abstract
A method for determining and/or monitoring a process variable of a medium, wherein a mechanically oscillatable unit is supplied with an exciter signal wherein a received signal coming from the mechanically oscillatable unit is received, and wherein the exciter signal is produced in such a manner, that a phase difference between the exciter signal and the received signal equals a predeterminable phase value. A criterion for judging the determining of the phase difference between the exciter signal and the received signal, or a signal dependent on the exciter signal or on the received signal, is established; in the case, in which the criterion for judging the determining of the phase difference is fulfilled, tuning of the phase difference is closed-loop controlled; and, in the alternative case, tuning of the phase difference is open-loop controlled. An apparatus associated with the method is also disclosed.
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