BS EN ISO 6145-7-2010 气体分析.动态容量法制备校准气体混合物.热式质量流量控制器

标准号：BS EN ISO 6145-7-2010
中文标准名称：气体分析.动态容量法制备校准气体混合物.热式质量流量控制器
英文标准名称：Gas analysis. Preparation of calibration gas mixtures using dynamic volumetric methods. Thermal mass-flow controllers
标准类型：G86
发布日期：2009/4/30 12:00:00
实施日期：2009/4/30 12:00:00
中国标准分类号：G86
国际标准分类号：71.040.40
引用标准：ISO 6143;ISO 6145-1-2003;ISO 7504
适用范围：This part of ISO 6145 is one of a series of International Standards dealing with dynamic volumetric methodsused for the preparation of calibration gas mixtures. This part specifies a method for continuous production ofcalibration gas mixtures, containing two or more components, from pure gases or other gas mixtures by use ofcommercially available thermal mass-flow controllers.If this method is employed for the preparation of calibration gas mixtures, the optimum performance is asfollows: the relative expanded uncertainty of measurement, U, obtained by multiplying the combined standarduncertainty by a coverage factor k = 2, is not greater than 2 %.If pre-mixed gases are used instead of pure gases, mole fractions below 10