EN ISO 6144:2006

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Procedure for preparing the calibration gas mixture
7 Calculation of the volume fraction of the calibration
   component in the gas mixture
8 Determination of the uncertainty in the concentration
   of the calibration component in the gas mixture
Annex A (informative) Example of an apparatus
        suitable for the preparation of calibration gas
        mixtures by the static volumetric method
Annex B (informative) Example of determination
        of the volume of metering syringes
Annex C (informative) Example of the determination
        of the uncertainty in the concentration of a
        calibration gas mixture prepared by the static
        volumetric method
Annex D (informative) Example of the determination
        of the stability, as a function of time, of prepared
        calibration gas mixtures
Bibliography

ISO 6144:2003 specifies a method for the preparation of calibration gas mixtures by a static volumetric method and provides a procedure for calculating the volumetric composition of the mixture. It can be used either with binary gas mixtures (containing one calibration component in a complementary gas, which is usually nitrogen or air) or with mixtures containing more than one component in the complementary gas. This International Standard also specifies how the expanded uncertainty in the volume fraction of each calibration component in the mixture is determined by a rigorous evaluation of all the measurement uncertainties involved, including those associated with the apparatus used for the preparation of the gas mixture and those associated with the experimental procedure itself.