This European standard specifies functional requirements for the design, construction, commissioning, operation and maintenance of new gas measuring stations for non-domestic custody transfer of natural gas as described in ISO/DIS13686 with a design capacity equal to or greater than 500 m3/h (at base conditions, see 4.1) and for operating pressures equal to or greater than 1bar (gauge pressure). NOTE: Installations using diaphragm gas meters as primary measuring instruments are not covered by this standard.