BS EN ISO 6142-1:2015

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Principle
6 Planning the preparation of the mixture
7 Purity analysis
8 Determination of masses and calculation of
   preparation uncertainty
9 Homogeneity and stability of the calibration
   gas mixture
10 Verification of calibration gas mixture composition
11 Uncertainty of the calibration gas mixture and
   preparation of certificate
Annex A (informative) - Precautions to be taken when
        weighing, handling and filling cylinders
Annex B (informative) - Practical examples
Annex C (informative) - Guidelines for estimating filling
        pressures so as to avoid condensation of
        condensable components in gas mixtures
Annex D (normative) - Liquid introduction
Annex E (informative) - Atomic weights and molar masses
Annex F (informative) - Derivation of the equation for
        calculating the calibration gas mixture composition
Annex G (informative) - Sensitivity coefficients for the
        calculation of the uncertainty of the amount fraction
        of a component
Annex H (informative) - Derivation of the equation for the
        final measurement uncertainty on the calibration
        gas mixture
Bibliography

Defines 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.