REDUCING THE UNCERTAINTY OF A GRAVIMETRIC PRIMARY STANDARD

Thomas Kegel, William Johansen

Abstract

CEESI operates a gravimetric primary standard for high pressure compressible flow measurement. A program is underway to reduce the uncertainty. A knife edged balance requires human position observation; an optical sensor will provide an electronic indication. A set of ball valves transfer the flow source from a start-up supply to the gravimetric pressure vessel. The upgrade will include monitoring pressure and temperature transients while the valves reposition. A series of "trapped volumes" contain fluid that is not included in the direct mass determination, but flows through the test section. Improved volume, pressure and temperature measurements are being implemented.

Keywords

primary standard, gravimetric, high-pressure, optical sensor

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IMEKO-TC9-2013-023.pdf

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IMEKO TC

TC9 - Flow Measurement

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