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Title: Improvements Of The Dynamic Gravimetric Flow Standard Dgfs() Below 0.2 mgs- 1 N2 (10 Sccm)
Author: J. Barbe C. Rombouts
Source: Flomeko 2016
Year Published: 2016
Abstract: In 2011, Laboratoire National de Metrologie et dEssais ( LNE ) installed a primary gas flow standard (dGFS) based on the dynamic gravimetric method. The dGFS developed by Fluke Calibration - Phoenix (FCP) was initially designed to calibrate molbloc laminar flow elements in the range from 0.2 mgs - 1 to 200 mgs - 1 of nitrogen (10 sccm to 10 slm) with a manufacturers expanded uncertainty ( k 2) on the order of 0. 06% of reading (variant with mass depleted). An LNE uncertainty analysis of the dGFS components using the GUM approach has given an expanded uncertainty ( k 2) on the reference mass flowrate of ( 0.06 % of reading + 3 10 - 4 mgs - 1 ) in this flow range. This uncertainty has been validated through different international comparisons using commercial transfer standards such as molbloc LFEs or portable volumetric devices.