GSO ISO 6145-7:2013

Gas analysis -- Preparation of calibration gas mixtures using dynamic volumetric methods -- Part 7: Thermal mass-flow controllers


GSO ISO 6145-7:2013 发布历史

GSO ISO 6145-7:2013由GSO 发布于 2013-09-09。

GSO ISO 6145-7:2013在国际标准分类中归属于: 71.040.40 化学分析。

GSO ISO 6145-7:2013 的最新版本是哪一版?

最新版本是 GSO ISO 6145-7:2013

GSO ISO 6145-7:2013的历代版本如下:

 

This part of ISO 6145 is one of a series of International Standards dealing with dynamic volumetric methods used for the preparation of calibration gas mixtures. This part specifies a method for continuous production of calibration gas mixtures, containing two or more components, from pure gases or other gas mixtures by use of commercially available thermal mass-flow controllers. If this method is employed for the preparation of calibration gas mixtures, the optimum performance is as follows: the relative expanded uncertainty of measurement, U, obtained by multiplying the combined standard uncertainty by a coverage factor k = 2, is not greater than 2 %. If pre-mixed gases are used instead of pure gases, mole fractions below 10−6 can be obtained. The measurement of mass flow is not absolute and the flow controller requires independent calibration. The merits of the method are that a large quantity of the gas mixture can be prepared on a continuous basis and that multicomponent mixtures can be prepared as readily as binary mixtures if the appropriate number of thermal mass-flow controllers is utilized. NOTE Gas-blending systems based upon thermal mass-flow controllers, some including the facility of computerization and automatic control, are commercially available.

标准号
GSO ISO 6145-7:2013
发布
2013年
发布单位
GSO
当前最新
GSO ISO 6145-7:2013
 
 

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