Method and devices use in flow measurement
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United States of America Patent
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-
Aug 3, 1999
Grant Date -
N/A
app pub date -
Nov 13, 1997
filing date -
May 22, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In flow measurement, a measurement signal essentially representing the instantaneous flow rate is determined with the aid of a flow transducer (2) in a flowmeter (1). In order to check whether the flowmeter measures correctly or not, the noise in the measurement signal from the transducer (2) is analyzed. To be more specific, one or more distribution values for the measurement signal are determined and compared with predetermined reference values that have been determined for operating conditions for which the flow transducer is intended. If this comparison reveals that the existing operating conditions differ from those for which the flowmeter is intended, a frequency spectrum for the measurement signal may be determined and compared with reference spectra that have been determined for various known operating conditions, thereby to identify the existing operating conditions. If these are identified, the function of the flowmeter may be corrected on line with the aid of predetermined correction data.
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