Norm

NEN-EN-ISO 6145-10:2008 en

Gasanalyse - Bereiding van kalibratiegasmengsels met gebruik van dynamische volumetrische methoden - Deel 10: Permeatiemethode

79,70

Over deze norm

Status Definitief
Aantal pagina's 16
Commissie Gasanalyse
Gepubliceerd op 01-09-2008
Taal Engels
This part of ISO 6145 specifies a dynamic method using permeation membranes for the preparation of calibration gas mixtures containing component mole fractions ranging from 10 9 and 10 6. A relative expanded uncertainty of 2,5 % of the component mole fraction can be achieved using this method. In the mole fraction range considered, it is difficult to maintain some gas mixtures, for example in cylinders, in a stable state. It is therefore desirable to prepare the calibration gas immediately before use, and to transfer it by the shortest possible path to the place where it is to be used. This technique has been successfully applied in generating low content calibration gas mixtures of, for example, sulfur dioxide (SO2), nitrogen dioxide (NO2) and benzene (C6H6) in air. If the carrier gas flow is measured as a gas mass-flow, the preparation of calibration gas mixtures using permeation tubes is a dynamic-gravimetric method which gives contents in mole fractions.

Details

ICS-code 71.040.40
Nederlandse titel Gasanalyse - Bereiding van kalibratiegasmengsels met gebruik van dynamische volumetrische methoden - Deel 10: Permeatiemethode
Engelse titel Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 10: Permeation method
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