Norm

NEN-EN-ISO 6145-7:2011 en

Gasanalyse - Bereiding van kalibratiegasmengsels met gebruik van dynamische volumetrische methoden - Deel 7: Thermische massadebiet regeltoestellen

79,70

Over deze norm

Status Definitief
Aantal pagina's 15
Commissie Gasanalyse
Gepubliceerd op 01-01-2011
Taal Engels
This part of ISO 6145 is one of a series of International Standards dealing with dynamic volumetric methods used for the preparation of calibration gas mixtures. This part specifies a method for continuous production of calibration gas mixtures, containing two or more components, from pure gases or other gas mixtures by use of commercially available thermal mass-flow controllers. If this method is employed for the preparation of calibration gas mixtures, the optimum performance is as follows: the relative expanded uncertainty of measurement, U, obtained by multiplying the combined standard uncertainty by a coverage factor k = 2, is not greater than 2 %. If pre-mixed gases are used instead of pure gases, mole fractions below 10-6 can be obtained. The measurement of mass flow is not absolute and the flow controller requires independent calibration. The merits of the method are that a large quantity of the gas mixture can be prepared on a continuous basis and that multicomponent mixtures can be prepared as readily as binary mixtures if the appropriate number of thermal mass-flow controllers is utilized.

Details

ICS-code 71.040.40
Nederlandse titel Gasanalyse - Bereiding van kalibratiegasmengsels met gebruik van dynamische volumetrische methoden - Deel 7: Thermische massadebiet regeltoestellen
Engelse titel Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 7: Thermal mass-flow controllers
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