标准编号：ISO 6142-1:2015
中文名称：气体分析 校准用混合气体的制备 第1部分：I类混合气体的称量法
英文名称：Gas analysis — Preparation of calibration gas mixtures — Part 1: Gravimetric method for Class I mixtures
发布日期：2015-08
标准范围
This part of ISO 6142 specifies a gravimetric method for the preparation of calibration gas mixturesin cylinders with traceable values for the amount-of-substance fraction (amount fraction) of one ormore components. This part of ISO 6142 describes a method for calculating the uncertainty associatedwith the amount fraction of each component. This uncertainty calculation requires the evaluation ofthe contributions to the uncertainty due to factors including the weighing process, the purity of thecomponents, the stability of the mixture, and the verification of the final mixture.This part of ISO 6142 is only applicable to mixtures of gaseous or totally vaporized components, whichmay be introduced into the cylinder in the gaseous or liquid state. Both binary and multi-component gasmixtures (including natural-gas type mixtures) are covered by this part of ISO 6142. Methods for thebatch production of more than one mixture in a single process are not included in this part of ISO 6142.This part of ISO 6142 requires estimation of the stability of the mixture for its intended life time(maximum storage life), but it is not for use with components that react with each other unintentionally.This part of ISO 6142 also requires the impurities in each parent gas or liquid used in the preparation ofthe mixture to be assessed and quantified.
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