GB/T5274This section specifies the method of preparing bottled calibration gas mixtures using the weighing method, and the molar fraction of one or more components of the calibration gas mixture can be traced back to the measured value. This section also specifies the calculation method for the uncertainty of the mole fraction of each component. When calculating this uncertainty, the uncertainty contribution of the following factors needs to be evaluated, including the weighing process, component purity, stability of the mixed gas, and verification of the final mixed gas.

This section is only applicable to the preparation of mixed gases of gaseous or gasifying components,The components can be introduced into the gas cylinder in gaseous or liquid form. This section covers binary or multicomponent gas mixtures(Including natural gas)Preparation of. This section does not include methods for batch preparation of multiple mixed gases in a single process.

To determine the shelf life of the mixed gas(Maximum storage period),This section specifies the methods for stability evaluation,However, this method is not applicable for evaluating the stability of components that react with each other. This section also specifies the requirements for each raw material used in the preparation of mixed gases(Gas or liquid)The method of quantitative analysis and evaluation of impurities in.