ISO 6145-8:2005 气体分析 标定用混合气体的制备 动态容量法 第8部分： 扩散的方法

标准编号：ISO 6145-8:2005

中文名称：气体分析 标定用混合气体的制备 动态容量法 第8部分： 扩散的方法

英文名称：Gas analysis — Preparation of calibration gas mixtures using dynamic volumetric methods — Part 8: Diffusion method

发布日期：2005-02

标准范围

This part of ISO 6145 specifies a dynamic method using diffusion for the preparation of calibration gasmixtures containing component mole fractions ranging from 10?9 to 10?3. A relative expanded uncertainty ofmeasurement, U, obtained by multiplying the relative combined standard uncertainty by a coverage factork = 2, of not greater than ± 2 % can be achieved by using this method.By keeping the path between the diffusion source and place of use as short as possible, the method can beapplied for the generation of low-concentration calibration gases of organic components that are liquid at roomtemperature, with boiling points ranging from about 40 °C to 160 °C.This part of ISO 6145 is applicable not only for the generation of calibration gas mixtures of a wide range ofhydrocarbons at ambient and indoor air concentration levels, but also for the generation of low-concentrationgas mixtures of water.

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