ASTM E 908 - 98. Standard Practice for Calibrating Gaseous Reference Leaks

American Society for Testing and Materials (ASTM). 1998, 6 pages.
This practice covers procedures for calibrating leak artifacts of a specified gas, that may be used for determining the response of leak detectors, or in other situations where a known small flow of gas is required. The purpose of this practice is to establish calibration without reference to other
calibrated leaks in as straightforward a manner as possible using the likeliest available equipment. While the uncertainties associated with these procedures will most likely be greater
than those obtained via traceable calibration chains (on the order of 10 %), these procedures allow independent means of establishing or verifying the leakage rate from leak artifacts of
questionable history, or when traceable leak artifacts are not available