NBN EN 1359 : 1999 AMD 1 2006

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

Describes the requirements and tests for the construction, performance, safety and production of class 1,5 mechanical diaphragm gas meters (hereinafter referred to as meters) having co-axial single pipe, or two pipe connections, used to measure volumes of fuel gases of the 1st, 2nd and 3rd families according to EN 437, at maximum working pressures not exceeding 0,5 bar and maximum actual flow rates not exceeding 160 m[3]/h over a minimum ambient temperature range of -10 degree C to +40 degree C and a gas temperature range as specified by the manufacturer with a minimum span of 40 K.