Standard Swedish standard · SS-EN ISO 6145-9:2011

Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 9: Saturation method (ISO 6145-9:2009)

Status: Valid

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Standard Swedish standard · SS-EN ISO 6145-9:2011

Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 9: Saturation method (ISO 6145-9:2009)
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Scope
This part of ISO 6145 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.

Subjects

Chemical analysis (71.040.40)


Buy this standard

Standard Swedish standard · SS-EN ISO 6145-9:2011

Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 9: Saturation method (ISO 6145-9:2009)
Subscribe on standards - Read more Dölj
Price: 1 013 SEK
standard ikon pdf

PDF

Price: 1 013 SEK
standard ikon

Paper

Price: 1 620,80 SEK
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Product information

Language: English

Written by: Svenska institutet för standarder

International title:

Article no: STD-76329

Edition: 1

Approved: 1/13/2011

No of pages: 28