UNCERTAINTY ESTIMATION OF A LIQUID FLOW STANDARD SYSTEM WITH SMALL FLOW RATES

Sejong Chun, Byung-Ro Yoon, Hae-Man Choi

Abstract

A liquid flow standard system has been used to calibrate liquid volume of a fuel-oil flow meter at small flow rates between 50 L/h and 700 L/h. However, the system has not been used to calibrate volume flow rate because the system runs at the standing-start-and-finish mode. To calibrate the volume flow rate of the fuel-oil flow meter, a flow diverter was installed and its performance was estimated in terms of measurement uncertainty. Diversion timing errors were corrected by linear curve fitting between measured and corrected elapsed time. Uncertainty contributions of the diversion timing errors amounted more than 60 % of the total uncertainty levels. The expanded uncertainty of volume flow rate was estimated to be more than 0.55 % in (50 ~ 700) L/h (<i>k</i> = 2.26) when the collected weight of liquid was about 10 kg. The expanded uncertainty became larger as the collected liquid weight was reduced.

Keywords

uncertainty, liquid, small flow rates, calibration

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IMEKO-TC9-2013-015.pdf

DOI

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IMEKO TC

TC9 - Flow Measurement

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