GB/T 5275.9-2014
Gas analysis.Preparation of calibration gas mixtures using dynamic volumetric methods.Part 9:Saturation method (English Version)

Standard No.: GB/T 5275.9-2014
Language: Chinese, Available in English version
Release Date: 2014
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 5275.9-2014

Scope: This part of GB/T 5275 is part of a series of national standards for preparing mixed gases for calibration using the dynamic volume method. This section specifies the method of continuously preparing a mixed gas for calibration using one or more condensable components. Through the synthesis of relative standard uncertainty contributions, the relative expanded uncertainty of this method is no more than 1% (expansion factor k=2). Unlike the rest of the series, the method described in this part does not require precise measurement of flow rate, as there is no flow parameter in the formula for calculating the volume fraction. For gas components that are easy to condense and easily adsorb on the surface of the gas phase, it is difficult to prepare a calibration mixture with accurate and stable concentration using the static method. Moreover, the pressure of this calibration gas mixture cannot be close to the saturated vapor pressure, otherwise condensation will occur. The saturated vapor pressure method can be used to prepare such mixed gases.

GB/T 5275.9-2014 Referenced Document

GB/T 10628-2008 Gas analysis.Comparison methods for determining and checking the composition of calibration gas mixtures
GB/T 14850-2008 Gas analysis.Vocabulary
ISO 16664 Gas analysis - Handling of calibration gases and gas mixtures - Guidelines*， 2017-05-01 Update

2014 GB/T 5275.9-2014 Gas analysis.Preparation of calibration gas mixtures using dynamic volumetric methods.Part 9:Saturation method