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BS EN ISO 6142-1:2015

BS EN ISO 6142-1:2015

$189.07

Gas analysis. Preparation of calibration gas mixtures – Gravimetric method for Class I mixtures

Published By Publication Date Number of Pages
BSI 2015 50
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PDF Catalog

PDF Pages PDF Title
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Symbols
11 5 Principle
13 6 Planning the preparation of the mixture
6.1 Feasibility of preparing the gas mixture
6.1.1 Safety considerations
6.1.2 Reactions of mixture components
6.1.3 Reactions with container materials
6.2 Choice of preparation method
14 6.3 Calculation of target masses
6.4 Condensation of components from the gas phase
7 Purity analysis
15 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
16 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
17 9.2 Stability
9.2.1 General
9.2.2 Assessing stability
19 9.2.3 Statistics for assessment stability
9.2.4 Calculation of the preparation uncertainty
10 Verification of calibration gas mixture composition
10.1 Objectives
20 10.2 Statistical tests for consistency and uncertainty due to verification
11 Uncertainty of the calibration gas mixture and preparation of certificate
22 Annex A (informative) Precautions to be taken when weighing, handling and filling cylinders
27 Annex B (informative) Practical examples
30 Annex C (informative) Guidelines for estimating filling pressures so as to avoid condensation of condensable components in gas mixtures
33 Annex D (normative) Liquid introduction
40 Annex E (informative) Atomic weights and molar masses
42 Annex F (informative) Derivation of the equation for calculating the calibration gas mixture composition
44 Annex G (informative) Sensitivity coefficients for the calculation of the uncertainty of the amount fraction of a component
45 Annex H (informative) Derivation of the equation for the final measurement uncertainty on the calibration gas mixture
46 Bibliography

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BS EN ISO 6142-1:2015
$189.07