NIST–IMGC comparison of gas flows below one litre per minute

Publisher Website
Google Scholar
Abstract
We compared the IMGC and NIST standards for small gas flows at the IMGC. The IMGC standard is a recently developed primary flow meter that extracts a large piston out of a temperature-controlled chamber. Controlling the piston's speed holds the pressure in the chamber constant. The NIST standard is a recently developed transfer standard that was calibrated against two primary standards at NIST. The first NIST primary extracts a large piston out of an oil-filled chamber in which a metal bellows is suspended. Controlling the piston's speed holds the pressure in the bellows constant. The second NIST primary is a static gravimetry method. The results include 49 nitrogen flow rates from 0.22 µmol s−1 to 770 µmol s−1 (1 µmol s−1 = 1.3448 cm3 min−1 of an ideal gas at the 'standard' conditions of 0 ûC and 101 325 Pa). For all but one of the comparisons, the agreement between IMGC and NIST is better than 0.06%.

This publication has 0 references indexed in Scilit: