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Upgrade and Requalification of an Ultra-low Flow, Low Uncertainty Gas Leak Measurement System

Abstract: The Accumulate Dump System (ADS) at Sandia National Laboratories is a high accuracy system designed to measure the volume flow rate of gas leak artifacts using fundamental quantities. One major advantage of this system is that it can measure the flow rate of any gas species across several orders of magnitude (10−10 to 10−15 mol / s). This system determines the leak rate by comparing a known molar quantity of gas to that collected from the unknown over a measured period of time. The known molar quantity is prepared by filling a known volume to a measured pressure at a specified temperature. Corrections are made for impurity of the gas, background signal, and equipment sensitivity. The ADS was brought online in the 1980's and used a magnetic sector to compare the ion currents of the two molar quantities. The ADS has been updated to now use a commercially purchased quadrupole system. Several components have been replaced allowing the system to be completely automated. This led to several advantages but unfortunately increased the overall uncertainty of the system. The theory behind the leak rate calculation with the associated uncertainties will be discussed, as well as leak rate measurement results of a 3-Mass species leak artifact.