SFS-EN ISO 6142-1:en

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ISO 6142-1:2015 specifies a gravimetric method for the preparation of calibration gas mixtures in cylinders with traceable values for the amount-of-substance fraction (amount fraction) of one or more components. This part of ISO 6142 describes a method for calculating the uncertainty associated with the amount fraction of each component. This uncertainty calculation requires the evaluation of the contributions to the uncertainty due to factors including the weighing process, the purity of the components, the stability of the mixture, and the verification of the final mixture.
ISO 6142-1:2015 is only applicable to mixtures of gaseous or totally vaporized components, which may be introduced into the cylinder in the gaseous or liquid state. Both binary and multi-component gas mixtures (including natural-gas type mixtures) are covered by this part of ISO 6142. Methods for the batch production of more than one mixture in a single process are not included in this part of ISO 6142.
ISO 6142-1:2015 requires estimation of the stability of the mixture for its intended life time (maximum storage life), but it is not for use with components that react with each other unintentionally. This part of ISO 6142 also requires the impurities in each parent gas or liquid used in the preparation of the mixture to be assessed and quantified.

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Sisällysluettelo

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Principle
6 Planning the preparation of the mixture

6.1 Feasibility of preparing the gas mixture
6.2 Choice of preparation method
6.3 Calculation of target masses
6.4 Condensation of components from the gas phase

7 Purity analysis
8 Determination of masses and calculation of preparation uncertainty

8.1 Preparation of cylinder
8.2 Determination of masses and their uncertainties
8.3 Atomic weights and molar masses
8.4 Calculation of the mixture composition
8.5 Calculation of gravimetric uncertainty

9 Homogeneity and stability of the calibration gas mixture

9.1 Homogeneity
9.2 Stability

10 Verification of calibration gas mixture composition

10.1 Objectives
10.2 Statistical tests for consistency and uncertainty due to verification

11 Uncertainty of the calibration gas mixture and preparation of certificate

Annex A Precautions to be taken when weighing, handling and filling cylinders (informative)
Annex B Practical examples (informative)
Annex C Guidelines for estimating filling pressures so as to avoid condensation of condensable components in gas mixtures (informative)
Annex D Liquid introduction (normative)
Annex E Atomic weights and molar masses (informative)
Annex F Derivation of the equation for calculating the calibration gas mixture composition (informative)
Annex G Sensitivity coefficients for the calculation of the uncertainty of the amount fraction of a component (informative)
Annex H Derivation of the equation for the final measurement uncertainty on the calibration gas mixture (informative)

Bibliography

Näytä kaikki

Tuoteryhmä(t)

71.040.40 Kemiallinen analyysi »

Sidokset

Velvoittavat viittaukset

ISO 14912:2003 Gas analysis -- Conversion of gas mixture composition data
ISO 16664:2004 Gas analysis -- Handling of calibration gases and gas mixtures -- Guidelines
ISO 19229:2015 Gas analysis -- Purity analysis and the treatment of purity data

Tekninen komitea

CEN/TC 238 Test gases, test pressures, appliance categories and gas appliance types »

Vahvistuspäivä

05.10.2015

Julkaisupäivä

23.10.2015

Painos

1

Sivumäärä

43

Julkaisun kieli

englanti