Liquid properties effects on Coriolis and thermal mass flow meters at very low flow rates

H. Bissig, M. Tschannen, M de Huu

Abstract

Calibration of flow devices are important in several areas of pharmaceutical, flow chemistry and health care applications where volumetric dosage or delivery at given flow rates are crucial for the process. Although most of the flow devices are measuring flow rates of process-oriented liquids their calibrations are often performed with water as calibration liquid. It is recommended to perform the calibrations of the flow devices with processoriented liquids as the liquid itself might influence the performance of the flow devices. Therefore, METAS has developed facilities with METAS flow generators to address the issue of measuring with process-oriented liquids for flow rates from 400 ml/min down to 50 nl/min with uncertainties from 0.07 % to 0.9 %.<BR /> The effects of liquids with different viscosities and thermal properties on the measurement accuracy of Coriolis and thermal mass flow meters have been investigated at these very low flow rates. Calibrations with water and several reference oils with traceable viscosity were performed to study the viscosity effect on the flow meter performance and the dependency on the thermal properties for the thermal mass flow meter. The results will be discussed in this paper.

Download

IMEKO-TC9-2019-003.pdf

DOI

-

IMEKO TC

TC9 - Flow Measurement

Back to the proceedings