This European Standard specifies ranges,construction,performances,output characteristics and testing of rotary displacement gas meters(hereinafter referred to as RD meters or simply meters)for gas volume measurement.
EN 12480:2002 history
2018EN 12480:2018 Gas meters - Rotary displacement gas meters
2015EN 12480:2015 Gas meters - Rotary displacement gas meters
2002EN 12480:2002 Gas Meters - Rotary Displacement Gas Meters AMD 1: 05/2006