ISO 6145-6:2017 气体分析 标定用混合气体的制备 动态容量法 第6部分：临界流孔

标准编号：ISO 6145-6:2017

中文名称：气体分析 标定用混合气体的制备 动态容量法 第6部分：临界流孔

英文名称：Gas analysis — Preparation of calibration gas mixtures using dynamic methods — Part 6: Critical flow orifices

发布日期：2017-07

标准范围

This document specifies a method for the dynamic preparation of calibration gas mixtures containing at least two gases (usually one of them is a complementary gas) from pure gases or gas pre-mixtures using critical flow orifices systems.
The method applies principally to the preparation of mixtures of non-reactive gases that do not react with any of the materials forming the gas circuit inside the critical flow orifices system or auxiliary equipment. It has the merit of allowing multi-component mixtures to be prepared as readily as binary mixtures if an appropriate number of critical flow orifices are used. 4 By selecting appropriate combinations of critical flow orifices, a dilution ratio of 1 × 10 is achievable.
Although it is more particularly applicable to the preparation of gas mixtures at atmospheric pressure, the method also offers the possibility of preparing calibration gas mixtures at pressures greater than atmospheric. The upstream pressure will need to be at least two times higher than downstream pressure.
The range of flow rates covered by this document extends from 1 ml/min to 10 l/min.

标准预览图