GB/T 5275.10-2009

This standard specifies the permeation method for preparing calibration gas mixtures by dynamically controlling the permeation rate of a component through a membrane into a carrier gas stream. It is applied in chemical analysis and environmental monitoring laboratories to generate precise, low-concentration gas standards for calibrating analyzers such as gas chromatographs or air quality monitors. The method is particularly useful for producing reactive or unstable gas mixtures where traditional static preparation methods are impractical.