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

ISO 6145-8:20 05规定了一种使用扩散的动态方法，用于制备包含组分摩尔分数范围为10-9至10-3的校准气体混合物。使用该方法可以获得不大于±2%的相对扩展测量不确定度U，其通过将相对组合标准不确定度乘以覆盖因子k=2而获得。通过保持扩散源和使用地点之间的路径尽可能短，该方法可应用于产生在室温下为液体、沸点范围为约40℃至160℃的有机组分的低浓度校准气体。ISO 6145-8:20 05不仅适用于在环境和室内空气浓度水平下产生各种碳氢化合物的校准气体混合物，而且也适用于产生低浓度的水的气体混合物。

ISO 6145-8:2005 specifies a dynamic method using diffusion for the preparation of calibration gas mixtures containing component mole fractions ranging from 10^-9 to 10^-3. A relative expanded uncertainty of measurement, U, obtained by multiplying the relative combined standard uncertainty by a coverage factor k = 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 be applied for the generation of low-concentration calibration gases of organic components that are liquid at room temperature, with boiling points ranging from about 40 °C to 160 °C.ISO 6145-8:2005 is applicable not only for the generation of calibration gas mixtures of a wide range of hydrocarbons at ambient and indoor air concentration levels, but also for the generation of low-concentration gas mixtures of water.

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