Norm

NEN-ISO 6145-6:2003 en

Gasanalyse - Bereiding van kalibratiegasmengsels met gebruik van dynamische volumetrische methoden - Deel 6: Kritische orifice platen

  • Deze norm is ingetrokken sinds 27-08-2008

48,19

Over deze norm

Status Ingetrokken
Aantal pagina's 11
Commissie Gasanalyse
Gepubliceerd op 01-07-2003
Taal Engels
This part of ISO 6145 specifies a method for the continuous production of calibration gas mixtures, containing two or more components, from pure gases or other gas mixtures by use of critical orifice systems. By selection of appropriate combinations of orifices and with the use of pure gases, the volume fraction of the calibration component in the calibration gas mixture can be varied by a factor of 102 . Additionally, it can be changed by a factor of 102 by changing the initial pressures in the orifice systems. The uncertainty of the method depends mainly upon the flow calibration method and the variations in temperature and outlet pressure. The relative expanded uncertainty in the volume fraction obtainable for a binary mixture (at a coverage factor of 2) is 3 %. If pre-mixed gases are used instead of pure gases, much lower volume fractions can be obtained (see Annex A).

Details

ICS-code 71.040.40
Nederlandse titel Gasanalyse - Bereiding van kalibratiegasmengsels met gebruik van dynamische volumetrische methoden - Deel 6: Kritische orifice platen
Engelse titel Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 6: Critical orifices
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