This document describes factors that may influence the composition of pure gases and homogeneous gas mixtures used for calibration purposes. This document only applies to gases or gas mixtures that are within the \u201cutilization period\u201d. It provides the following guidelines for the handling and use of calibration gas mixtures:<\/p>\n
storage of calibration gas cylinders;<\/p>\n<\/li>\n
calibration gas withdrawal from cylinders;<\/p>\n<\/li>\n
transfer of calibration gas from cylinders to the point of calibration.<\/p>\n<\/li>\n<\/ul>\n
It also outlines a method of assessing the stability of a gas mixture, taking into account the gas composition uncertainty given on the certificate and the user\u2019s measurement uncertainty.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 2<\/td>\n | National foreword <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | European foreword Endorsement notice <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | Foreword <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | Introduction <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 4 Transport and storage 4.1 General remarks 4.2 Low temperature <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4.3 High temperature 4.4 Water 4.5 Storage and handling 5 Mode of withdrawal 5.1 General 5.2 Minimum utilization pressure <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 5.3 Temperature 5.4 Pressure reduction and flow 5.5 Replacement, change of cylinder positions 6 Transfer system 6.1 Purging procedure <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 6.2 Considerations when designing and constructing gas transfer lines 6.2.1 Modes of gas sampling <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 6.2.2 Pressure- and flow-reducing equipment 6.2.3 Material for the construction of transfer lines <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 6.2.4 General methods and examples of sampling systems <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 7 Stability <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Annex\u00a0A (informative) Check on the stability of calibration gas mixtures by end-users <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Gas analysis. Handling of calibration gases and gas mixtures. Guidelines<\/b><\/p>\n |