气体分析. 采用比较法测定基于单点和两点校准的混合气体组成

[中文适用范围]： 本文件提供了以下方法：——使用一种或两种校准气体混合物对仪器进行校准，——确定气体样品的组成，——评估气体样品组成的不确定性与其所用校准气体组成的不确定性和测量过程的贡献有关。本文件规定了利用不同测量校准设计时的要求和接受标准，并限定了使用的校准气体混合物数量（即最少数量）。本文所述的方法适用于表示为物质的量分数的情况，但也可应用于其他组成量（例如质量分数、体积分数或浓度）。 [外文原描述]： ISO 12963:2017 provides methods for - calibrating an instrument with one or two calibration gas mixtures, - determining the composition of a gas sample, and - evaluating the uncertainty of the composition of the gas sample in relation to the uncertainty of the composition of the calibration gases used and the contribution of the measurement process. ISO 12963:2017 sets requirements to, and acceptance criteria for, the utilization of different measurement calibration designs with a limited (i.e. minimum) number of calibration gas mixtures used in calibration. The methods in this document are described for amount-of-substance fractions, but are also applicable for other composition quantities (such as mass fractions, volume fractions or concentrations).