INTERNATIONAL STANDARD
First edition2014-05-01
Metersforirrigationwater
Compteurs pour l'eau d’irrigation
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@ ISO 2014
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Contents
Page
Technical characteristics.5.1 5.2 General specifications Rated operating conditions. 6 75.4 Indicating device. Materials. 75.5 Reverse flow. 8 75.6 5.7 Sealing and security. Other devices. 8 6
Metrological requirements.6.1 6.2 Indicating error. Internal pressure. 6 66.3 Flow profile sensitivity classes. Pressure loss. 66.4 10
Performance tests 11
7.1 General conditions for the tests. 117.2 7.3 Static pressure test. Determination of errors. 12 127.4 7.5 Flow disturbance tests. Pressure loss test. 14 147.6 Reverse flow test. 17Endurance tests. 18
Foreword
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forestry Submittee SC 18 Irrigation and drainage equipment and systems. The mittee responsible for this document is ISo/TC 23 Tractors and machinery for agriculture and
Metersforirrigationwater
1Scope
This International Standard applies to water meters intended for irrigation use (herein after referred toand certification procedures for water meters irrespective of the design technologies used to meter the actual volume of cold water or heated water flowing through a fully charged closed conduit. These watermeters incorporate devices which indicate the integrated volume.
and to water meters based on mechanical principles incorporating electronic devices used to meter the actual volume flow of cold water. It provides metrological requirements for electronic ancillarydevices when they are subject to metrological control. As a rule the ancillary devices are optional. However national or international regulations make some ancillary devices mandatory in relation tothe utilization of the water meter.
2 Normativereferences
The following documents in whole or in part are normatively referenced in this document and areindispensable for its application. For dated references only the edition cited applies. For undated references the latest edition of the referenced document (including any amendments) applies.
ISO 4064-1:2005 Measurement of water flow in fully charged closed conduits - Meters for cold potablewater and hot water - Part 1: Specifications
ISO 4064-2:2005 Measurement of water flow in fully charged closed conduits - Meters for cold potablewater and hot water -Part 2: Installation requirements
ISO 9644 Agricultural irrigation equipment - Pressure losses in irrigation valves - Test method
ISO 286-2 Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes - Part 2: Tables of standard tolerance classes and limit deviations for holes and shafts
ISO 228-1 Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions tolerances and designation
ISO/IEC Guide 98-3 Uncertainty of measurement -Part 3: Guide to the expression of uncertainty inmeasurement (GUM:1995)
3 Terms and definitions
For the purposes of this document the following terms and definitions apply.
water meter
instrument intended to measure continuously store and display the volume of water passing through the measurement transducer at metering conditions
Note 1 to entry: A water meter includes at least a measurement transducer a calculator (including adjustment orcorrection devices if present) and an indicating device. These three devices may be in different housings.
[SOURCE: OIML R49-1:2006 2.1.1 modified - The second note is not included here.]
