REDUCING THE UNCERTAINTY OF A GRAVIMETRIC PRIMARY STANDARD

• 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
• Download:

  IMEKO-TC9-2013-023.pdf
• DOI:

  _unreg_tc9-2013.023

Event details: