QUANTIFYING IMPACTS ON THE MEASUREMENT UNCERTAINTY IN FLOW CALIBRATION ARISING FROM DYNAMIC FLOW EFFECTS

Rainer Engel, Hans-Joachim Baade

Abstract

Traceability of the measurement units in fluid flow metering, as the state-of-the-art approach, is practiced as a so-called element-by-element method which relies upon the idealistic assumption that the measurement process in a flow calibration facility can be run under exact steady-state conditions, i.e. absolutely no fluctuations of the flow quantities are assumed to occur during the flow measurement process. Practical experiences, combined with a model-based analytical view of the measurement process in a flow standard, have revealed that dynamic impacts on the measurement uncertainty due to flow rate fluctuations have to be taken into account, in addition to the steady-state traceability chain.

Keywords

liquid flow calibration, fluctuation of process parameters, measurement uncertainty analysis, traceability in fluid flow, element-by-element chain of traceability, dynamic system behavior

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IMEKO-TC9-2013-014.pdf

DOI

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IMEKO TC

TC9 - Flow Measurement

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