scope:

This part of ISO 4064 applies to water meters used to meter the volume of cold potable water and hot water flowing through a fully charged, closed conduit. These water meters incorporate devices which indicate the integrated volume.

This part of ISO 4064 specifies technical characteristics and pressure loss requirements for meters for cold potable water and hot water. It applies to water meters which can withstand:

a) a maximum admissible pressure(MAP) equal to at least MPa1) [0,6 MPa for meters for meters for use with pipe nominal diameters (DNs) >500 mm];

b) a maximum admissible temperature (MAT) for cold potable water meters of 30oC;

c) a MAT for hot water meters of up to 180oC, depending on class.

In addition to meters based on mechanical principles, this part of ISO 4064 also applies to water meters based on electrical or electronic principle, and to water meters based on mechanical principles incorporating electronic devices, used to measure the volume of cold potable water and hot water. It also applies to electronic ancillary devices. As a rule ancillary devices are optional. However, national or international regulation may make some ancillary devices mandatory in relation to the utilization of the water meter.