UNE-EN ISO 6143:2026

This document provides methods for:

determining the composition of a calibration gas mixture by comparison with appropriate reference

gas mixtures,

calculating the uncertainty of the composition of a calibration gas mixture in relation to the known

uncertainty of the 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 gas mixtures,

consistency testing and outlier search in suites of calibration gas mixtures of closely related

composition.

NOTE In principle, the method described in this document is also applicable to the analysis of (largely)

unknown samples instead of prospective calibration gas mixtures (i.e. gas mixtures which are intended for use

as calibration gas mixtures). Such applications, however, require appropriate care and consideration of additional

uncertainty components, for example concerning the effect of matrix differences between the reference gases

used for calibration and the analysed sample. On the other hand, in many applications one- and two-point

calibration is preferred over multi-point calibration. ISO 12963[5] is designed for such applications.