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Title: Reducing The Uncertainty Of A Gravimetric Primary Standard
Author: Thomas Kegel William Johansen
Source: Flomeko 2013
Year Published: 2013
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.

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