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Title: Aspects Of Traceability And Comparisons In Flow Measurement
Author: Rainer Engel, Bodo Mickan
Source: 2009 International Symposium on Fluid Flow Measurement
Year Published: 2009
Abstract: Key comparisons, in general, are necessary to prove and assure the measurement uncertainty entries in the CMC (calibration and measurement capabilities) data base held at the Bureau International des Poids et Mesures (BIPM). Due to the physical character of the measurands of fluid flow, the units of those cannot be directly transferred or traced back. Therefore, an element-by-element approach of traceability is applied. The measuring quantity that is implicitly transferring the flow units is the meter factor of the so-called transfer flowmeter that is utilized for comparison or traceability purposes. But, as fluid-flow and meter-installation effects reveal impacts on meter readings, flow comparison measurement data may, occasionally, be affected by several systematic effects. Those systematic effects can exceed in their results those that originate from general statistical processes and effects which are generally part of any measurement process. In those cases comparisons would result in inconsistent data sets among the participating laboratories. Thus, in flow unit traceability or comparison measurements, flowmeters with highly stable metering properties must be applied, whose meter factors have been qualified in a characterizing test process so that systematic factors of influence may be compensated for by applying correction factors.

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