EN ISO 6143:2006

This International Standard provides methods for_ determining the composition of a calibration gas mixture by comparison with appropriate reference gasmixtures,_ calculating the uncertainty of the composition of a calibration gas mixture in relation to the known uncertainty ofthe composition of the reference gas mixtures with which it was compared,_ checking the composition attributed to a calibration gas mixture by comparison with appropriate reference gasmixtures,_ comparing the composition of several calibration gas mixtures, e.g. for the purpose of comparing differentmethods of gas mixture preparation, or for testing consistency among gas mixtures of closely relatedcomposition.NOTE In principle, the method described in this document is also applicable to the analysis of (largely) unknown samplesinstead of prospective calibration gas mixtures (i.e. gas mixtures which are intended for use as calibration gas mixtures). Suchapplications, however, require appropriate care and consideration of additional uncertainty components, for example concerningthe effect of matrix differences between the reference gases used for calibration and the analysed sample.