Foreword
1 Scope
2 Normative references
3 Terminology
    3.1 Definitions
    3.2 Symbols
4 Working conditions
    4.1 Flow range
    4.2 Maximum working pressure
    4.3 Temperature range
5 Metrological performance
    5.1 Errors of indication
    5.2 Pressure absorption
    5.3 Starting flow rate
    5.4 Metrological stability
6 Construction and material
    6.1 General
    6.2 Robustness
    6.3 Corrosion protection
    6.4 Resistance to storage temperature range
    6.5 Optional features
7 Mechanical performance
    7.1 Meter assembly
    7.2 Index
    7.3 Diaphragms and other components in the gas path
8 Marking
    8.1 All meters
    8.2 Two-pipe meters
    8.3 Durability and legibility of marking
9 Meters supplied for testing
Annex A (normative) Production requirements for gas meters
Annex B (normative) Diaphragm gas meters provided with a
                    built-in mechanical gas temperature
                    conversion device
Annex C (normative) Integral battery powered electronic
                    indexes for diaphragm gas meters
Annex D (informative) Bibliography