Norm

NEN-ISO 6145-9:2009 en

Gasanalyse - Bereiding van kalibratiegasmengsels met gebruik van dynamische volumetrische methoden - Deel 9: Verzadigingsmethode

  • Deze norm is ingetrokken sinds 04-01-2011

79,70

Over deze norm

Status Ingetrokken
Aantal pagina's 14
Commissie Gasanalyse
Gepubliceerd op 01-10-2009
Taal Engels
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.

Details

ICS-code 71.040.40
Nederlandse titel Gasanalyse - Bereiding van kalibratiegasmengsels met gebruik van dynamische volumetrische methoden - Deel 9: Verzadigingsmethode
Engelse titel Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 9: Saturation method
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