scope:

This part of ISO 4064|OIML R 49 specifies the metrological and technical requirements for water meters for cold potable water and water flowing through a fully charged, closed conduit. These water meters incorporate devices which indicate the integrated volume.

In addition to water meters based on mechanical principle, this part of ISO 4064|oiml r 49 applies to device based on electrical or electronic principles, and mechanical principle incorporating electronic devices, used to measure the volume of cold potable water and hot water.

This part of ISO 4064|OIML R 49 also applies to electronic ancillary devices. Ancillary devices are optional. However, it is possible for national or regional regulation to render some ancillary devices mandatory in relation to the utilization of water meters.

NOTE Any national regulations apply in the country of use.