Gas analysis. Preparation of calibration gas mixtures using dynamic methods - Critical flow orifices1 Scope This document specifies a method for the dynamic preparation of calibration gas mixtures containing at least two gases (usually one of them is a complementary gas) from pure gases or gas pre mixtures using critical flow orifices systems. The method applies principally to the preparation of mixtures of non reactive gases that do not react with any of the materials forming the gas circuit inside the critical flow orifices system or auxiliary

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