UNE-EN ISO 4064-4:2025

This part of ISO 4064 applies to water meters used to meter the volume of cold potable water and hotwater flowing through a fully charged, closed conduit. These water meters incorporate devices whichindicate the integrated volume.This part of ISO 4064 specifies technical characteristics and pressure loss requirements for meters forcold potable water and hot water. It applies to water meters which can withstand:a) a maximum admissible pressure (MAP) equal to at least 1 MPa1) [0,6 MPa for meters for use withpipe nominal diameters (DNs) e"500 mm];b) a maximum admissible temperature (MAT) for cold potable water meters of 30 °C;c) a MAT for hot water meters of up to 180 °C, depending on class.In addition to meters based on mechanical principles, this part of ISO 4064 also applies to watermeters based on electrical or electronic principles, and to water meters based on mechanical principlesincorporating electronic devices, used to meter the volume flow of hot water and cold potable water. Italso applies to electronic ancillary devices. As a rule ancillary devices are optional. However, nationalor international regulations may make some ancillary devices mandatory in relation to the utilizationof the water meter.