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Title: Laboratory Versus In Situ Proving Of Liquid Ultrasonic Meters
Author: Terry Cousins
Source: 2017 International School of Hydrocarbon Measurement
Year Published: 2017
Abstract: Unfortunately all meters are fundamentally non-linear in their basic form. This means that unless the meter is characterized in some way to account for this non-linearity the meter when it arrives on site the proving must take into account this non-linearity if the meter is going to encounter any flow changes. In particular changes in Reynolds number will cause calibration change, but proving on site and correcting for Reynolds number is an arduous and often impossible task. These meters have to be linearized, whether it is by modifying the fluid mechanics as in the case of the turbine meter, for exam ple, or by a correction deter mined by the physics using software, as with a USM. The corrections are often very sensitive to operational conditions, in particular viscosity changes and so it is essential that the meters are characterized in the way that is not fragile when the meter is installed. Proving will obviously help with site variations, but it is essential that the initial data fit, linearization is carried out under controlled conditions. To achieve this the base calibration facility must have a good uncertainty, good range of viscosity to achieve the required Reynolds number range and a good pedigree, such as ISO 17025.

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