NF EN ISO 6145-5
Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 5 : capillary calibration devices
ISO 6145-5:2009 is one of a series of International Standards dealing with the various dynamic volumetric techniques used for the preparation of calibration gas mixtures. This part specifies a method for the continuous production of calibration gas mixtures from pure gases or gas mixtures using capillary calibration devices in single or multiple combinations (gas dividers). Single capillary systems can be used to provide gas mixtures where the minor component is in the range of volume fractions from 10-8 to 0,5. The relative expanded uncertainty of this technique is less than ±2 % (k = 2) relative. This application is used in industrial gas mixing panels for the production of specific gas atmospheres. Gas dividers can be used to divide gas mixtures prepared from gases or gas mixtures into controlled proportions by volume. These devices are capable of dilutions in the range of volume fractions from 0,000 5 to 0,9 of the primary gas concentration with a relative repeatability of better than 0,5 %. Traceability of the gas mixtures produced by a gas divider is achieved by comparison of a mixture with gas mixtures related to national or international gas standards. An example is given in Annex A.
ISO 6145-5:2009 is one of a series of International Standards dealing with the various dynamic volumetric techniques used for the preparation of calibration gas mixtures. This part specifies a method for the continuous production of calibration gas mixtures from pure gases or gas mixtures using capillary calibration devices in single or multiple combinations (gas dividers).
Single capillary systems can be used to provide gas mixtures where the minor component is in the range of volume fractions from 10-8 to 0,5.
The relative expanded uncertainty of this technique is less than ±2 % (k = 2) relative. This application is used in industrial gas mixing panels for the production of specific gas atmospheres.
Gas dividers can be used to divide gas mixtures prepared from gases or gas mixtures into controlled proportions by volume. These devices are capable of dilutions in the range of volume fractions from 0,000 5 to 0,9 of the primary gas concentration with a relative repeatability of better than 0,5 %.
Traceability of the gas mixtures produced by a gas divider is achieved by comparison of a mixture with gas mixtures related to national or international gas standards. An example is given in Annex A.
Le présent document fait partie d'une série de Normes internationales qui traitent des diverses méthodes volumétriques dynamiques utilisées pour la préparation des mélanges de gaz d'étalonnage. Il spécifie une méthode de production continue de mélanges de gaz d'étalonnage à partir de gaz purs ou de mélanges de gaz, utilisant des dispositifs capillaires en combinaisons simples ou multiples (séparateurs de gaz).
- Avant-proposiv
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1 Domaine d'application1
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2 Références normatives1
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3 Principe1
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4 Appareillage2
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4.1 Système de mélange à deux capillaires2
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4.2 Dispositifs à capillaires multiples utilisant des séparateurs de gaz4
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5 Expression des résultats7
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5.1 Fraction volumique7
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5.2 Sources d'incertitudes8
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5.3 Vérification du système de mélange/séparateur de gaz8
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5.4 Détermination des incertitudes9
- Annexe A (informative) Exemple numérique10
- Annexe B (informative) Dérivation de la formule de l'incertitude composée de K13
- Bibliographie14
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