Development of a gas micro-flow transfer standard

Barbé, J. C.; Boineau, Frédéric; Macé, Tatiana; Otal, Pierre

doi:10.1016/j.flowmeasinst.2014.11.011

Cited by 5 publications

(1 citation statement)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The recently reported primary standards are reaching the low range of 10 cm 3 min −1 (0.2 mg s −1 of nitrogen) by a gravimetric method [2], and 1 cm 3 min −1 [3], 0.05 cm 3 min −1 [1] or even 0.01 cm 3 min −1 [4] by volumetric methods. The problems of suitable transfer standards for these ranges are also in the focus of the metrology community [5][6][7]. The Czech Metrology Institute (CMI) must keep pace with these developments.…”

Section: Introductionmentioning

confidence: 99%

Gravimetric flow standard in the vacuum and hermetic modes

Vičar

Krajicek

Pražák

et al. 2018

Meas. Sci. Technol.

View full text Add to dashboard Cite

The Czech national standard of low gas flow is based on the dynamic gravimetry principle, defining the flow rate as the mass loss of gas from a pressure bottle which is continuously weighed. This weighing is performed in ambient atmosphere, which brings two problems. First, the buoyancy corrections are the main and unavoidable source of uncertainty. Second, condensation of the water vapor on the pressure bottle can occur, due to its cooling below dew point at higher flow rates. A weighing carried out in a hermetically closed atmosphere suppresses the problematic buoyancy effects. A weighing in a vacuum does the same, and also eliminates any danger of water condensation. The paper describes the hermetic and vacuum mode modifications together with the relevant uncertainty analyses.

show abstract