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Norm

ISO 6145-10:2002

Ausgabedatum: 2002 02 07

Gas analysis — Preparation of calibration gas mixtures using dynamic volumetric methods — Part 10: Permeation method

This part of ISO 6145 specifies a dynamic method using permeation membranes for the preparation of calibration gas mixtures containing component mole fractions ranging fr...
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Herausgeber:
International Organization for Standardization
Format:
Digital | 16 Seiten
Sprache:
Englisch

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.

ISO 6145-10:2002
2002 02 07
Gas analysis — Preparation of calibration gas mixtures using dynamic volumetric methods — Part 10: P...
Norm
ISO 6349:1979
1979 12 01
Gas analysis — Preparation of calibration gas mixtures — Permeation method
Norm