scope:

This European Standard specifies the requirements and tests for the construction, performance, safety and production of class 1,5 diaphragm gas meters (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 in accordance with EN 437:2003+A1:2009, at maximum working pressures not exceeding 0,5 bar and maximum actual flow rates not exceeding 160 m3/h over a minimum ambient and gas temperature range of -10 °C to +40 °C. This standard applies to meters with and without built-in temperature conversion that are installed in locations with vibration and shocks of low significance and in - closed locations (indoor or outdoor with protection as specified by the manufacturer) with condensing or with non-condensing humidity or, if specified by the manufacturer, - open locations (outdoor without any covering) with condensing humidity or with non-condensing humidity - in locations with electromagnetic disturbances corresponding to those likely to be found in residential, commercial and light industrial buildings. Unless otherwise stated, all pressures given in this document are gauge pressure. Clauses 1 to 9 and Annex B and Annex D are for design and type testing only. Requirements for electronic indexes, batteries, valves incorporated in the meter and additional functionalities are given in EN 16314. NOTE The content of OIML Publications 'International Recommendation R 137' has been taken into account in the drafting of this standard. Significant changes from previous editions include: ? conformity with the MID 2009/137/EC regarding declared errors of the same sign and testing Qmin at the minimum and maximum declared gas temperatures; - corrosion protection restructured; - endurance testing revised to reflect more accurately current operating conditions; - requirements for non-metallic meters for external use added to take account of different material characteristics; ...