International Standard
ISO 6145-9:2009
Gas analysis — Preparation of calibration gas mixtures using dynamic volumetric methods — Part 9: Saturation method
Reference number
ISO 6145-9:2009
Edition 2
2009-10
International Standard
Read sample
ISO 6145-9:2009
45469
Published (Edition 2, 2009)
This standard was last reviewed and confirmed in 2019. Therefore this version remains current.

ISO 6145-9:2009

ISO 6145-9:2009
45469
Language
Format
CHF 96
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Abstract

ISO 6145-9:2009 is one of a series of International Standards dealing with various dynamic volumetric methods used for the preparation of calibration gas mixtures. This part specifies a method for continuous production of calibration gas mixtures containing one or more readily condensable components. 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 ±1 %, can be obtained using this method.

Unlike the methods presented in the other parts of ISO 6145, the method described in this part does not require accurate measurement of flow rates since flow rates do not appear in the equations for calculation of the volume fraction.

Readily condensable gases and vapours commonly become adsorbed on surfaces, and it is therefore difficult to prepare stable calibration gas mixtures of accurately known composition, containing such components, by means of static methods. In addition, these calibration gas mixtures cannot be maintained under a pressure near the saturation limit without the occurrence of condensation. The saturation method can be employed to prepare mixtures of this type.

General information

  •  : Published
     : 2009-10
    : International Standard confirmed [90.93]
  •  : 2
     : 14
  • ISO/TC 158
    71.040.40 
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