This Standard specifies requirements for water meters for use in non-urban applications in open channel and part-filled pipe applications. It primarily applies to metering for irrigation water; however, it is intended that it be used for non-urban water applications other than applications covered by AS 3565.1 or AS 4747.2.Two types of meters are covered in this Standard, as follows:(a)A ‘self-contained unit’—a meter that defines its own geometry, is able to be pattern-approved as a complete water meter, calibrated upon assembly and supplied by a single supplier.(b)A ‘modular metering system’—a device or group of instruments (which may be supplied as a pattern approved metering system) that does not define the installation geometry and requires configuration after installation.NOTES: 1The requirements for these types of meters to demonstrate compliance with this Standard and hence with the National Framework are set out and illustrated in Section 7.2Purchasing guidelines are given in Appendix A.The Standard covers meters that operate under the following conditions:(i)Open channels.(ii)Working water temperature range of 0.1°C to 30°C. The maximum admissible temperature is 50°C, which is the limiting condition for the meter.(iii)Ambient temperatures range of ?5°C to 55°C.(iv)Ambient humidity range of 0% to 100%, except for remote-indicating devices where the range is 0% to 93%.NOTE: Meters with undefined or variable profile channel are not covered by this Standard.

First published as ATS 4747.3—2008.Revised and redesignated AS 4747.3—2013. First published as ATS 4747.3-2008. Revised and redesignated AS 4747.3-2013.