NF EN ISO 6145-8

NF EN ISO 6145-8

December 2008
Standard Current

Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 8 : diffusion method

ISO 6145-8:2005 specifies a dynamic method using diffusion for the preparation of calibration gas mixtures containing component mole fractions ranging from 10-9 to 10-3. A relative expanded uncertainty of measurement, U, obtained by multiplying the relative combined standard uncertainty by a coverage factor k = 2, of not greater than ± 2 % can be achieved by using this method. By keeping the path between the diffusion source and place of use as short as possible, the method can be applied for the generation of low-concentration calibration gases of organic components that are liquid at room temperature, with boiling points ranging from about 40 °C to 160 °C. ISO 6145-8:2005 is applicable not only for the generation of calibration gas mixtures of a wide range of hydrocarbons at ambient and indoor air concentration levels, but also for the generation of low-concentration gas mixtures of water.

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Main informations

Collections

National standards and national normative documents

Publication date

December 2008

Number of pages

28 p.

Reference

NF EN ISO 6145-8

ICS Codes

71.040.40   Chemical analysis

Classification index

X20-205-8

Print number

1 - 14/11/2008

International kinship

ISO 6145-8:2005

European kinship

EN ISO 6145-8:2008
Sumary
Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 8 : diffusion method

ISO 6145-8:2005 specifies a dynamic method using diffusion for the preparation of calibration gas mixtures containing component mole fractions ranging from 10-9 to 10-3. A relative expanded uncertainty of measurement, U, obtained by multiplying the relative combined standard uncertainty by a coverage factor k = 2, of not greater than ± 2 % can be achieved by using this method.

By keeping the path between the diffusion source and place of use as short as possible, the method can be applied for the generation of low-concentration calibration gases of organic components that are liquid at room temperature, with boiling points ranging from about 40 °C to 160 °C.

ISO 6145-8:2005 is applicable not only for the generation of calibration gas mixtures of a wide range of hydrocarbons at ambient and indoor air concentration levels, but also for the generation of low-concentration gas mixtures of water.

Table of contents
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  • Avant-propos
    iv
  • Introduction
    v
  • 1 Domaine d'application
    1
  • 2 Références normatives
    1
  • 3 Principe
    1
  • 4 Réactifs et matériaux
    2
  • 5 Appareillage
    3
  • 5.1 Appareillage par diffusion
    3
  • 5.2 Cellules de diffusion
    4
  • 6 Mode opératoire
    4
  • 6.1 Vérifications préliminaires et conditions de fonctionnement
    4
  • 6.2 Détermination de la perte de masse
    5
  • 7 Expression des résultats
    6
  • 7.1 Calcul
    6
  • 7.2 Sources d'incertitude
    7
  • Annexe A (informative) Exemple pratique d'un calibreur de cellule de diffusion configuré pour évaluer la vitesse de réponse d'un hygromètre
    11
  • Annexe B (informative) Exemple de performance des cellules de diffusion pour le toluène et le trichlorométhane
    14
  • Annexe C (informative) Exemple de calculs d'incertitude pour un système de pesage périodique
    16
  • Bibliographie
    20
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