ISO 6145-10:2002

February 2002

International standard Current

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 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.

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Main informations

Collections

International ISO standards

Publication date

February 2002

Number of pages

16 p.

Reference

ISO 6145-10:2002

ICS Codes

71.040.40 Chemical analysis

Print number

1 - 14/02/2002

Sumary

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 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.

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