ISO 6142-2:2024 气体分析 校准用混合气体的制备 第2部分：II类混合气体的称量法

标准编号：ISO 6142-2:2024

中文名称：气体分析 校准用混合气体的制备 第2部分：II类混合气体的称量法

英文名称：Gas analysis — Preparation of calibration gas mixtures — Part 2: Gravimetric method for Class II mixtures

发布日期：2024-02

标准范围

本文件描述了II类校准气体混合物的静态重量制备，并描述了计算与每种成分的量分数相关的测量不确定度的方法。除了ISO 6142-1中提到的测量不确定度的所有因素外，本文件还考虑了未经单独验证的II类混合物的验证过程产生的不确定度，就像I类混合物的情况一样。本文件扩展了ISO 6142-1中描述的不确定度评估，以包括批生产和验证过程的影响。它为如何推导代表特定类别混合物的不确定性预算提供了指导。本文件包括在单一工艺中分批生产多于一种混合物的方法。本文件仅适用于气态或完全汽化组分的混合物，其可以以气态或液态引入钢瓶。本文件涵盖二元和多组分气体混合物。本文件仅限于大于或等于100的非反应性分子/组分？微摩尔/摩尔。本文件不包括相互反应或与常见混合物污染物（如水蒸气或氧气）反应或以吸收或吸附形式与钢瓶和阀门的内表面反应的部件。

This document describes the static gravimetric preparation of Class II calibration gas mixtures and describes a method for calculating the measurement uncertainty associated with the amount fraction of each component. In addition to all of the contributions to the measurement uncertainty mentioned in ISO 6142-1, this document also considers the uncertainty resulting from the validation process for Class II mixtures that are not individually verified, as is the case for Class I mixtures.

This document extends the uncertainty evaluation described in ISO 6142-1 to include the effects of batch production and the verification process. It provides guidance on how to derive an uncertainty budget that is representative of a particular category of mixtures.

Methods for the batch production of more than one mixture in a single process are included in this document.

This document is only applicable to mixtures of gaseous or totally vaporized components, which can be introduced into the cylinder in the gaseous or liquid state. Both binary and multi-component gas mixtures are covered by this document.

This document is limited to non-reactive molecules/components that are greater than or equal to an amount fraction of 100 μmol/mol. This document excludes components that react with each other, or with common mixture contaminants such as water vapour or oxygen or react with the inner surface of the cylinder and valve in the form of absorption or adsorption.

标准预览图