标准号：ISO 6145-6-2003
实施状态：作废
中文名称：气体分析.动态容量法制备校准用混合气体.第6部分:临界声孔
英文名称：Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 6: Critical orifices
发布日期：2003-05
被替代标准：ISO 6145-6-2017
代替标准：ISO 6145-6-1986;ISO/DIS 6145-6-2001
采用标准：DIN EN ISO 6145-6-2008,IDT;DIN EN ISO 6145-6-2008,IDT;BS EN ISO 6145-6-2003,IDT;GB/T 5275.6-2014,IDT;EN ISO 6145-6-2008,IDT;prEN ISO 6145-6-2008,IDT;NF X20-205-6-2008,IDT;SN EN ISO 6145-6-2008,IDT;OENORM EN ISO 6145-6-2008,IDT;OENORM EN ISO 6145-6-2008,IDT;PN-EN ISO 6145-6-2008,IDT;SS-EN ISO 6145-6-2008,IDT;UNE-EN ISO 6145-6-2008,IDT;UNE-ISO 6145-6-2006,IDT;KS I ISO 6145-6-2010,IDT;KS I ISO 6145-6-2015,IDT;DS/EN ISO 6145-6-2008,IDT;UNI EN ISO 6145-6-2009-2009,IDT;STN EN ISO 6145-6-2009,IDT;CSN EN ISO 6145-6-2009,IDT;DS/EN ISO 6145-6-2008,IDT;NEN-EN-ISO 6145-6-2008 en-2008,IDT;NEN-ISO 6145-6-2003 en-2003,IDT
起草单位：ISO/TC 158
标准简介：This part of ISO 6145 specifies a method for the continuous production of calibration gas mixtures, containing two or more components, from pure gases or other gas mixtures by use of critical orifice systems. By selection of appropriate combinations of orifices and with the use of pure gases, the volume fraction of the calibration component in the calibration gas mixture can be varied by a factor of 10<up4>. Additionally, it can be changed by a factor of 10<up2> by changing the initial pressures in the orifice systems. The uncertainty of the method depends mainly upon the flow calibration method and the variations in temperature and outlet pressure. The relative expanded uncertainty in the volume fraction obtainable for a binary mixture (at a coverage factor of 2) is 3 %.
If pre-mixed gases are used instead of pure gases, much lower volume fractions can be obtained (see Annex A). The mass flow rates or volume flow rates, from which the mass or volume fractions are determined, can be calculated and can be independently measured by a suitable method given in ISO 6145-1.
The merits of the method are that multi-component mixtures can be prepared as readily as binary mixtures if the appropriate number of orifices is utilized, and that a large quantity of calibration gas mixture can be prepared on a continuous basis. The range of flow rates can be from several millilitres per minute to approximately 10 l/min.
Although particularly applicable to preparation of gas mixtures at barometric pressure, the method also provides a means of preparation of calibration gas mixtures at pressures above barometric pressure.
Annex B gives practical hints on the use of the method.
文件格式：PDF
文件大小：351.54KB
文件页数：18
（以上信息更新时间为：2019-11-23）
ISO 6145-6-2003 气体分析.动态容量法制备校准用混合气体.第6部分_临界声孔.pdf
(351.54 KB)
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