Reaffirmed 2024

NATIONAL FOREWORD

This Indian Standard (First Revision) which is identical with ISO 16664 : 2017 ‘Gas analysis - Handling of calibration gases and gas mixtures - Guidelines’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the Industrial Gases Sectional Committee and approval of the Chemical Division Council.

This standard describes factors that may influence the composition of pure gases and homogeneous gas mixtures used for calibration purposes. This standard provides guidelines for the handling and use of calibration gas mixtures; storage of calibration gas cylinders, calibration gas withdrawal from cylinders and transfer of calibration gas from cylinders to the point of calibration. It also outlines a method to assess the stability of a gas mixture, taking into account the gas composition uncertainty given on the certificate and the user’s measurement uncertainty.

This standard, which was originally published in 2014, was identical with ISO 16664 : 2004. The first revision of this standard has been undertaken to align it with ISO 16664 : 2017.

The major changes in this revision are as follows:

a) Figure 1 and Fig. 5 have been revised to more clearly depict the arrangements; and

b) Several references and terminological entries have been updated.

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appears referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practice is to use a point (.) as the decimal marker.