EN ISO 4064-2:2014

SLOVENSKI STANDARD
01-julij-2014
1DGRPHãþD
SIST EN 14154-1:2005+A2:2011
SIST EN 14154-2:2005+A2:2011
SIST EN 14154-3:2005+A2:2011
9RGRPHUL]DPHUMHQMHKODGQHSLWQHYRGHLQYURþHYRGHGHO3UHVNXVQHPHWRGH
,62
Water meters for cold potable water and hot water - Part 2: Test methods (ISO 4064-
2:2014)
Wasserzähler zum Messen von kaltem Trinkwasser und heißem Wasser - Teil 2:
Prüfverfahren (ISO 4064-2:2014)
Compteurs d'eau potable froide et d'eau chaude - Partie 2: Méthodes d'essai (ISO 4064-
2:2014)
Ta slovenski standard je istoveten z: EN ISO 4064-2:2014
ICS:
17.120.10 Pretok v zaprtih vodih Flow in closed conduits
91.140.60 Sistemi za oskrbo z vodo Water supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 4064-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2014
ICS 91.140.60 Supersedes EN 14154-1:2005+A2:2011, EN 14154-
2:2005+A2:2011, EN 14154-3:2005+A2:2011
English Version
Water meters for cold potable water and hot water - Part 2: Test
methods (ISO 4064-2:2014)
Compteurs d'eau potable froide et chaude - Partie 2: Wasserzähler zum Messen von kaltem Trinkwasser und
Méthodes d'essai (ISO 4064-2:2014) heißem Wasser - Teil 2: Prüfverfahren (ISO 4064-2:2014)
This European Standard was approved by CEN on 21 September 2013.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4064-2:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2004/22/EC .4

Foreword
This document (EN ISO 4064-2:2014) has been prepared by Technical Committee ISO/TC 30 “Measurement
of fluid flow in closed conduits” in collaboration with Technical Committee CEN/TC 92 “Water meters” the
secretariat of which is held by SNV.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by December 2014, and conflicting national standards shall be withdrawn
at the latest by December 2014.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 14154-1:2005+A2:2011, EN 14154-2:2005+A2:2011,
EN 14154-3:2005+A2:2011.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 4064-2:2014 has been approved by CEN as EN ISO 4064-2:2014 without any modification.

Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 2004/22/EC
This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association to provide one means of conforming to Essential Requirements of
the New Approach Directive 2004/22/EC, Measuring instruments directive.
Once this standard is cited in the Official Journal of the European Communities under that Directive and has
been implemented as a national standard in at least one Member State, compliance with the normative
clauses of this standard confers, within the limits of the scope of this standard, a presumption of conformity
with the relevant Essential Requirements of that Directive and associated EFTA regulations.
WARNING: Other requirements and other EU Directives may be applicable to the products falling within the
scope of this standard.
INTERNATIONAL ISO
STANDARD 4064-2
Fourth edition
2014-06-01
Water meters for cold potable water
and hot water —
Part 2:
Test methods
Compteurs d’eau potable froide et chaude —
Partie 2: Méthodes d’essai
Reference number
ISO 4064-2:2014(E)
©
ISO 2014
ISO 4064-2:2014(E)
© ISO 2014
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
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Published in Switzerland
ii © ISO 2014 – All rights reserved

ISO 4064-2:2014(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Reference conditions . 2
5 Symbols, units and equations . 3
6 External examination . 3
6.1 General . 3
6.2 Object of the examination . 3
6.3 Preparation . 3
6.4 Examination procedures . 4
7 Performance tests for all water meters . 8
7.1 General . 8
7.2 Required conditions for all tests . 8
7.3 Static pressure test (ISO 4064-1:2014|OIML R 49-1:2013, 4.2.10) . 9
7.4 Determination of intrinsic errors (of indication) (ISO 4064-1:2014|OIML R 49-1:2013,
7.2.3) .10
7.5 Water temperature test (ISO 4064-1:2014|OIML R 49-1:2013, 4.2.8) .18
7.6 Overload water temperature test (ISO 4064-1:2014|OIML R 49-1:2013, 7.2.5) .18
7.7 Water pressure test (ISO 4064-1:2014|OIML R 49-1:2013, 4.2.8) .19
7.8 Reverse flow test (ISO 4064-1:2014|OIML R 49-1:2013, 4.2.7) .19
7.9 Pressure loss test (ISO 4064-1:2014|OIML R 49-1:2013, 6.5) .21
7.10 Flow disturbance tests (ISO 4064-1:2014|OIML R 49-1:2013, 6.3.4) .25
7.11 Durability tests (ISO 4064-1:2014|OIML R 49-1:2013, 7.2.6) .26
7.12 Magnetic field testing .31
7.13 Tests on ancillary devices of a water meter .31
7.14 Environmental testing .32
8 Performance tests related to influence factors and disturbances .32
8.1 General requirements (ISO 4064-1:2014|OIML R 49-1:2013, A.1) .32
8.2 Dry heat (non-condensing) (ISO 4064-1:2014|OIML R 49-1:2013, A.5) .36
8.3 Cold (ISO 4064-1:2014|OIML R 49-1:2013, A.5).37
8.4 Damp heat, cyclic (condensing) (ISO 4064-1:2014|OIML R 49-1:2013, A.5) .38
8.5 Power supply variation (ISO 4064-1:2014|OIML R 49-1:2013, A.5) .39
8.6 Vibration (random) (ISO 4064-1:2014|OIML R 49-1:2013, A.5) .42
8.7 Mechanical shock (ISO 4064-1:2014|OIML R 49-1:2013, A.5) .43
8.8 AC mains voltage dips, short interruptions and voltage variations (ISO 4064-
1:2014|OIML R 49-1:2013, A.5) .44
8.9 Bursts on signal lines (ISO 4064-1:2014|OIML R 49-1:2013, A.5) .45
8.10 Bursts (transients) on AC and DC mains (ISO 4064-1:2014|OIML R 49-1:2013, A.5) .47
8.11 Electrostatic discharge (ISO 4064-1:2014|OIML R 49-1:2013, A.5) .48
8.12 Radiated electromagnetic fields (ISO 4064-1:2014|OIML R 49-1:2013, A.5) .49
8.13 Conducted electromagnetic fields (ISO 4064-1:2014|OIML R 49-1:2013, A.5) .51
8.14 Surges on signal, data and control lines (ISO 4064-1:2014|OIML R 49-1:2013, A.5) .53
8.15 Surges on AC and DC mains power lines (ISO 4064-1:2014|OIML R 49-1:2013, A.5) . .54
8.16 Static magnetic field (ISO 4064-1:2014|OIML R 49-1:2013, 7.2.8) .55
8.17 Absence of flow test .56
9 Test program for type evaluation .57
9.1 Number of samples required .57
9.2 Performance test applicable to all water meters .57
9.3 Performance tests applicable to electronic water meters, mechanical water meters fitted
with electronic devices, and their separable parts .58
ISO 4064-2:2014(E)
9.4 Type evaluation of separable parts of a water meter .58
9.5 Families of water meters .59
10 Tests for initial verification .59
10.1 Initial verification of complete and combined water meters .59
10.2 Initial verification of separable parts of a water meter .60
11 Presentation of results .61
11.1 Object of the reports .61
11.2 Identification and test data to be included in records .61
Annex A (normative) Type examination and testing of checking facilities of electronic devices .63
Annex B (normative) Calculating the relative error (of indication) of a water meter .69
Annex C (normative) Installation requirements for flow disturbance tests .75
Annex D (normative) Type evaluation of a family of water meters .77
Annex E (informative) Examples of methods and components used for testing concentric
water meters .79
Annex F (informative) Determining the density of water .82
Annex G (informative) Maximum uncertainties in the measurement of influence factors
and disturbances .84
Annex H (informative) Pressure loss test pressure tappings, hole and slot details .87
Annex I (normative) Flow disturbers .90
Bibliography .101
iv © ISO 2014 – All rights reserved

ISO 4064-2:2014(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2, www.iso.org/directives.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received, www.iso.org/patents.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
The committees responsible for this document are Technical Committee ISO/TC 30, Measurement of fluid
flow in closed conduits, Subcommittee SC 7, Volume methods including water meters and OIML Technical
Subcommittee TC 8/SC 5 Water meters.
This fourth edition of ISO 4064-2 cancels and replaces the third edition (ISO 4064-2:2005), which has
been technically revised. Provisions of the third edition are addressed in ISO 4064-5:2014.
ISO 4064 consists of the following parts, under the general title Water meters for cold potable water and
hot water:
— Part 1: Metrological and technical requirements
— Part 2: Test methods
— Part 3: Test report format
— Part 4: Non-metrological requirements not covered in ISO 4064-1
— Part 5: Installation requirements
This edition of ISO 4064-2 is identical with the corresponding edition of OIML R 49-2, which has been
issued concurrently. OIML R 49-2 was approved for final publication by the International Committee of
Legal Metrology at its 48th meeting in Ho Chi Minh City, Vietnam in October 2013 and will be submitted
to the International Conference on Legal Metrology in 2016 for formal sanction.
INTERNATIONAL STANDARD ISO 4064-2:2014(E)
Water meters for cold potable water and hot water —
Part 2:
Test methods
1 Scope
This part of ISO 4064|OIML R 49 is applicable to the type evaluation and initial verification testing of
water meters for cold potable water and hot water as defined in ISO 4064-1:2014|OIML R 49-1:2013.
OIML Certificates of Conformity can be issued for water meters under the scope of the OIML Certificate
System, provided that this part of ISO 4064|OIML R 49, ISO 4064-1:2014|OIML R 49-1:2013 and
ISO 4064-3:2014|OIML R 49-3:2013 are used in accordance with the rules of the System.
This part of ISO 4064|OIML R 49 sets out details of the test programme, principles, equipment and
procedures to be used for the type evaluation, and initial verification of a meter type.
The provisions of this part of ISO 4064|OIML R 49 also apply to ancillary devices, if required by national
regulations.
The provisions include requirements for testing the complete water meter and for testing the
measurement transducer (including the flow or volume sensor) and the calculator (including the
indicating device) of a water meter as separate units.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable 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 4064-1:2014|OIML R 49-1:2013, Water meters for cold potable water and hot water — Part 1:
Metrological and technical requirements
ISO 4064-3:2014|OIML R 49-3:2013, Water meters for cold potable water and hot water — Part 3: Test
report format
ISO/IEC Guide 98-3:2008, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in
measurement (GUM:1995)
IEC 60068-2-1, Environmental testing — Part 2-1: Tests — Test A: Cold
IEC 60068-2-2, Environmental testing — Part 2-2: Tests — Test B: Dry heat
IEC 60068-2-30, Environmental testing — Part 2-30: Tests — Test Db: Damp heat, cyclic (12 h + 12 h cycle)
IEC 60068-2-31, Environmental testing — Part 2-31: Tests — Test Ec: Rough handling shocks, primarily for
equipment-type specimens
IEC 60068-2-47, Environmental testing — Part 2-47: Tests — Mounting of specimens for vibration, impact
and similar dynamic tests
IEC 60068-2-64, Environmental testing — Part 2-64: Tests — Test Fh: Vibration, broadband random and
guidance
IEC 60068-3-4, Environmental testing — Part 3-4: Supporting documentation and guidance — Damp heat
tests
ISO 4064-2:2014(E)
IEC 60654-2, Operating conditions for industrial process measurement and control equipment — Part 2:
Power
IEC 61000-2-1, Electromagnetic compatibility (EMC) — Part 2: Environment — Section 1: Description of
the environment — Electromagnetic environment for low-frequency conducted disturbances and signaling
in public power supply systems
IEC 61000-2-2, Electromagnetic compatibility (EMC) — Part 2-2: Environment — Compatibility levels for
low-frequency conducted disturbances and signaling in public low-voltage power supply systems
IEC 61000-4-1, Electromagnetic compatibility (EMC) — Part 4-1: Testing and measurement techniques —
Overview of IEC 61000-4 series
IEC 61000-4-2, Electromagnetic compatibility (EMC) — Part 4-2: Testing and measurement techniques —
Electrostatic discharge immunity test
IEC 61000-4-3, Electromagnetic compatibility (EMC) — Part 4-3: Testing and measurement techniques —
Radiated, radio frequency, electromagnetic field immunity test
IEC 61000-4-4, Electromagnetic compatibility (EMC) — Part 4-4: Testing and measurement techniques —
Electrical fast transient/burst immunity test
IEC 61000-4-5, Electromagnetic compatibility (EMC) — Part 4-5: Testing and measurement techniques —
Surge immunity test
IEC 61000-4-6, Electromagnetic compatibility (EMC) — Part 4-6: Testing and measurement techniques —
Immunity to conducted disturbances, induced by radio-frequency fields
IEC 61000-4-11, Electromagnetic compatibility (EMC) — Part 4-11: Testing and measurement techniques —
Voltage dips, short interruptions and voltage variations immunity tests
IEC 61000-6-1, Electromagnetic compatibility (EMC) — Part 6-1: Generic standards — Immunity for
residential, commercial and light-industrial environments
IEC 61000-6-2, Electromagnetic compatibility (EMC) — Part 6-2: Generic standards — Immunity for
industrial environments
OIML D 11:2004, General requirements for electronic measuring instruments
OIML G 13, Planning of metrology and testing laboratories
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4064-1:2014|OIML R 49-
1:2013 apply.
4 Reference conditions
All applicable influence quantities, except for the influence quantity being tested, shall be held at the
following values during type evaluation tests on a water meter. However, for influence factors and
2 © ISO 2014 – All rights reserved

ISO 4064-2:2014(E)
disturbances for electronic water meters, it is permissible to use the reference conditions defined in the
applicable IEC standard:
Flow rate: 0,7 × (Q + Q ) ± 0,03 × (Q + Q )
2 3 2 3
Water temperature: T30, T50 is 20 °C ± 5 °C
T70 to T180 is 20 °C ± 5 °C and 50 °C ± 5 °C
T30/70 to T30/180 is 50 °C ± 5 °C
Water pressure: Within rated operating conditions
(see ISO 4064-1:2014|OIML R 49-1:2013, 6.4)
Ambient temperature range: 15 °C to 25 °C
Ambient relative humidity range: 45 % to 75 %
Ambient atmospheric pressure range: 86 kPa to 106 kPa [0,86 bar to 1,06 bar]
Power supply voltage (mains AC): Nominal voltage, U ± 5 %
nom
Power supply frequency: Nominal frequency, f ± 2 %
nom
Power supply voltage (battery): A voltage V in the range U ≤ V ≤ U
bmin bmax
During each test, the temperature and relative humidity shall not vary by more than 5 °C or 10 %,
respectively, within the reference range. The reference conditions are permitted to deviate from the
defined tolerance values during the performance tests if evidence can be given to the body responsible
for type approval that the type of meter under consideration is not affected by the deviation of the
condition in question. The actual values of the deviating condition, however, shall be measured and
documented as part of the performance test documentation.
5 Symbols, units and equations
Equations, symbols and their units, concerning the calculation of the error (of indication) of a water
meter used in this part of ISO 4064|OIML R 49, are given in Annex B.
6 External examination
6.1 General
During the external examination, all relevant values, dimensions, and observations shall be recorded.
NOTE 1 For presentation of the results of type examinations, see Clause 11.
NOTE 2 The relevant subclauses of ISO 4064-1:2014|OIML R 49-1:2013 are shown in parentheses in the
following.
6.2 Object of the examination
To verify that a water meter meets the requirements of ISO 4064-1:2014|OIML R 49-1:2013 with respect
to the design of the indicating device, the marking of the meter and the application of protection devices.
6.3 Preparation
Linear measurements that have to be taken of a meter shall be made using traceable, calibrated
measuring devices.
ISO 4064-2:2014(E)
The actual or apparent dimensions of the scales of the indicating device shall be taken without removing
the meter lens or disassembling the meter.
NOTE A travelling microscope (cathetometer) can be used to measure the width, spacing and height of the
scale divisions and the height of the numerals.
6.4 Examination procedures
6.4.1 General
The following aspects of a meter design shall be examined on at least one meter from the sample.
Either the same meter sample may be used for all the external examinations or different meters from
the samples submitted may be used for some of the examinations.
6.4.2 Marks and inscriptions (ISO 4064-1:2014|OIML R 49-1:2013, 6.6)
a) Verify that a place is provided for affixing the verification mark which is visible without dismantling
the water meter.
b) Verify that the water meter is clearly and indelibly marked with the information presented in
ISO 4064-1:2014|OIML R 49-1:2013, 6.6.2.
c) Complete the section reference ISO 4064-1:2014|OIML R 49-1:2013, 6.6.1 and 6.6.2 (r) in
ISO 4064-3:2014|OIML R 49-3:2013, 4.4.1.
6.4.3 Indicating device (ISO 4064-1:2014|OIML R 49-1:2013, 6.7)
6.4.3.1 Function (ISO 4064-1:2014|OIML R 49-1:2013, 6.7.1.1)
a) Verify that the indicating device provides an easily read, reliable and unambiguous visual indication
of the indicated volume.
b) Verify that the indicating device includes visual means for testing and calibration.
c) If the indicating device includes additional elements for testing and calibration by other methods,
e.g. for automatic testing and calibration, record the type(s) of device.
d) If the meter is a combination meter with two indicating devices, 6.4.3 applies to both indicating
devices.
e) Complete the section reference ISO 4064-1:2014|OIML R 49-1:2013, 6.7.1.1 in
ISO 4064-3:2014|OIML R 49-3:2013, 4.4.1.
6.4.3.2 Unit of measurement, symbol, and its placement (ISO 4064-1:2014|OIML R 49-1:2013,
6.7.1.2)
a) Verify that the indicated volume of water is expressed in cubic metres.
b) Verify that the symbol m appears on the dial or immediately adjacent to the numbered display.
c) Complete the section reference ISO 4064-1:2014|OIML R 49-1:2013, 6.7.1.2 in
ISO 4064-3:2014|OIML R 49-3:2013, 4.4.1.
6.4.3.3 Indicating range (ISO 4064-1:2014|OIML R 49-1:2013, 6.7.1.3)
a) Verify that the indicating device is able to record the indicated volume in cubic metres given in
ISO 4064-1:2014|OIML R 49-1:2013, Table 5 corresponding to the permanent flow rate Q without
passing through zero.
4 © ISO 2014 – All rights reserved

ISO 4064-2:2014(E)
b) Complete the section reference ISO 4064-1:2014|OIML R 49-1:2013, 6.7.1.3, in
ISO 4064-3:2014|OIML R 49-3:2013, 4.4.1.
6.4.3.4 Colour coding for indicating devices (ISO 4064-1:2014|OIML R 49-1:2013, 6.7.1.4)
a) Verify that either:
1) the colour black is used to indicate the cubic metre and its multiples; and
2) the colour red is used to indicate sub-multiples of a cubic metre; and
3) the colours are applied either to the pointers, indexes, numbers, wheels discs, dials or aperture
frames;
or other means of indicating the cubic metre are used in which there is no ambiguity in
distinguishing between the primary indication and alternative displays, e.g. sub-multiples for
verification and testing.
b) Complete the section reference ISO 4064-1:2014|OIML R 49-1:2013, 6.7.1.4, in
ISO 4064-3:2014|OIML R 49-3:2013, 4.4.1.
6.4.3.5 Types of indicating device (ISO 4064-1:2014|OIML R 49-1:2013, 6.7.2)
6.4.3.5.1 Type 1 — Analogue device (ISO 4064-1:2014|OIML R 49-1:2013, 6.7.2.1)
a) If a type 1 indicating device has been used, verify that volume is indicated by:
— either continuous movement of one or more pointers moving relative to graduated scales;
— or continuous movement of one or more circular scales or drums, each passing an index.
n
b) Verify that the value expressed in cubic metres for each scale division is of the form 10 , where n is a
positive or a negative whole number or zero, thereby establishing a system of consecutive decades.
c) Verify that each scale is either graduated in values expressed in cubic metres or accompanied by a
multiplication factor (×0,001; ×0,01; ×1; ×10; ×100; ×1 000, etc.).
d) Verify that the rotational movements of the pointers or circular scales are clockwise.
e) Verify that the linear movement of the pointers or scales is from left to right.
f) Verify that the movement of the numbered roller indicators is upwards.
g) Complete the section reference ISO 4064-1:2014|OIML R 49-1:2013, 6.7.2.1, in
ISO 4064-3:2014|OIML R 49-3:2013, 4.4.1.
6.4.3.5.2 Type 2 — Digital device (ISO 4064-1:2014|OIML R 49-1:2013, 6.7.2.2)
a) Verify that the indicated volume is given by a line of digits, appearing in one or more apertures.
b) Verify that the advance of one digit is completed while the digit of the next immediately lower decade
changes from 9 to 0.
c) Verify that the actual or apparent height of the digits is at least 4 mm.
d) For non-electronic devices:
1) verify that the movement of the numbered roller indicators (drums) is upwards;
ISO 4064-2:2014(E)
2) if the lowest value decade has a continuous movement, verify that the aperture is large enough
to permit a digit to be read without ambiguity.
For electronic devices:
3) verify that for non-permanent displays the volume can be displayed at any time for at least 10 s;
4) check the entire display visually in the following sequence:
i) for seven segment type verify that all the elements can be correctly displayed (e.g. an
“eights” test),
ii) for seven segment type verify that all the elements can be blanked (a “blanks” test),
iii) for graphical displays use an equivalent test to verify that display faults cannot result in
any digit being misinterpreted,
iv) verify that each step of the sequence lasts at least 1 s.
e) Complete the section reference ISO 4064-1:2014|OIML R 49-1:2013, 6.7.2.2 in
ISO 4064-3:2014|OIML R 49-3:2013, 4.4.1.
6.4.3.5.3 Type 3 — Combination of analogue and digital devices (ISO 4064-
1:2014|OIML R 49-1:2013, 6.7.2.3)
a) If the indicating device is a combination of type 1 and 2 devices, verify that the respective
requirements of each apply (see 6.4.3.5.1 and 6.4.3.5.2).
b) Complete the section reference ISO 4064-1:2014|OIML R 49-1:2013, 6.7.2.3 in
ISO 4064-3:2014|OIML R 49-3:2013, 4.4.1.
6.4.3.6 Verification devices — First element of an indicating device — Verification interval
(ISO 4064-1:2014|OIML R 49-1:2013, 6.7.3)
6.4.3.6.1 General requirements (ISO 4064-1:2014|OIML R 49-1:2013, 6.7.3.1)
a) Verify that the indicating device has the means for visual, non-ambiguous verification testing and
calibration.
b) Note whether the visual verification display has a continuous or a discontinuous movement.
c) Note whether, in addition to the visual verification display, the indicating device includes provisions
for rapid testing by the inclusion of complementary elements (e.g. star wheels or discs), providing
signals through externally attached sensors. Note the relationship, stated by the manufacturer,
between the visual indication of volume and the signals emitted by these complementary devices.
d) Complete the section reference ISO 4064-1:2014|OIML R 49-1:2013, 6.7.3.1 in
ISO 4064-3:2014|OIML R 49-3:2013, 4.4.1.
6.4.3.6.2 Visual verification display (ISO 4064-1:2014|OIML R 49-1:2013, 6.7.3.2)
6.4.3.6.2.1 Value of the verification scale interval (ISO 4064-1:2014|OIML R 49-1:2013,
6.7.3.2.1)
a) Verify that the value of the verification scale interval, expressed in cubic metres, is of the form 1 ×
n n n
10 , or 2 × 10 , or 5 × 10 , where n is a positive or negative whole number, or zero.
b) For analogue and digital indicating devices with continuous movement of the first element, verify
that the verification scale interval is formed from the division into 2, 5 or 10 equal parts of the
interval between two consecutive digits of the first element.
6 © ISO 2014 – All rights reserved

ISO 4064-2:2014(E)
c) For analogue and digital indicating devices with continuous movement of the first element, verify
that numbering is not applied to the divisions between consecutive digits of the first element.
d) For digital indicating devices with discontinuous movement of the first element, the verification
scale interval is the interval between two consecutive digits or incremental movements of the first
element.
e) Complete the section reference ISO 4064-1:2014|OIML R 49-1:2013, 6.7.3.2.1 in
ISO 4064-3:2014|OIML R 49-3:2013, 4.4.1.
6.4.3.6.2.2 Form of the verification scale (ISO 4064-1:2014|OIML R 49-1:2013, 6.7.3.2.2)
a) If the indicating device has continuous movement of the first element, check that the apparent scale
spacing is not less than 1 mm and not more than 5 mm.
b) Verify that the scale consists of:
— either lines of equal thickness not exceeding one-quarter of the scale spacing and differing only
in length;
— or contrasting bands of a constant width equal to the scale spacing.
c) Verify that the apparent width of the pointer at its tip does not exceed one-quarter of the scale
spacing.
d) Verify that the apparent width of the pointer at its tip does not exceed 0,5 mm.
e) Complete the section reference ISO 4064-1:2014|OIML R 49-1:2013, 6.7.3.2.2, in
ISO 4064-3:2014|OIML R 49-3:2013, 4.4.1.
6.4.3.6.2.3 Resolution of the indicating device (ISO 4064-1:2014|OIML R 49-1:2013, 6.7.3.2.3)
a) Note the value of the verification scale interval, δV m3
b) Calculate the actual volume V in m passed during  h 30 min at the minimum flow rate Q , from
a 1
V = Q × 1,5
a 1
c) Calculate the resolution error εr of the indicating device, expressed as a percentage, from:
1) for continuous movement of the first element:
05,,δδVV+05
ε = ×100%
r
V
a
δV
= ×100%
V
a
2) For discontinuous movement of the first element:
δδVV+
ε = ×100%
r
V
a
2δV
= ×100%
V
a
d) Verify that for accuracy class 1 meters, the value of the verification scale interval is small enough
to ensure that the resolution error ε of the indicating device does not exceed 0,25 % of the actual
r
volume required during 1 h 30 min at the minimum flow rate, Q .
ε ≤ 0,25 %
r
ISO 4064-2:2014(E)
e) Verify that for accuracy class 2 meters, the verification scale interval is small enough to ensure that
the resolution error ε of the indicating device does not exceed 0,5 % of the actual volume required
r
during 1 h 30 min at the minimum flow rate, Q .
ε ≤ 0,5 %
r
f) Complete the section reference ISO 4064-1:2014|OIML R 49-1:2013, 6.7.3.2.3 in
ISO 4064-3:2014|OIML R 49-3:2013, 4.4.1.
When the display of the first element is continuous, an allowance shall be made for a maximum error in
each reading of not more than half of the verification scale interval.
When the display of the first element is discontinuous, an allowance shall be made for a maximum error
in each reading of not more than one digit of the verification scale.
6.4.4 Protection devices (ISO 4064-1:2014|OIML R 49-1:2013, 6.8)
a) Verify that the water meter includes protection devices as specified in
ISO 4064-1:2014|OIML R 49-1:2013, 6.8.
b) Complete the section reference ISO 4064-1:2014|OIML R 49-1:2013, 6.8.1 and 6.8.2.3 in
ISO 4064-3:2014|OIML R 49-3:2013, 4.4.1.
7 Performance tests for all water meters
7.1 General
During the performance tests, all relevant values, dimensions and observations shall be recorded.
NOTE 1 For presentation of the results of type evaluation tests see Clause 11.
NOTE 2 The relevant sub-clauses of ISO 4064-1:2014|OIML R 49-1:2013 are shown in parentheses in the
following.
7.2 Required conditions for all tests
7.2.1 Water quality
Water meter tests shall be carried out using water. The water shall be that of the public potable water
supply or shall meet the same requirements.
The water shall not contain any substance which might damage the meter or adversely affect its
operation. It shall not contain air bubbles.
If water is being recycled, measures shall be taken to prevent residual water in the meter from becoming
harmful to human beings.
7.2.2 General rules concerning test installation and location
7.2.2.1 Freedom from spurious influences
Test rigs shall be so designed, constructed, and used, that the performance of the rig itself shall not
contribute significantly to the test error. To this end, high standards of rig maintenance, plus adequate
supports and fittings, are necessary to prevent vibration of the meter, the test rig, and its accessories.
The test rig environment shall be such that the reference conditions of the test are met (see Clause 4).
8 © ISO 2014 – All rights reserved

ISO 4064-2:2014(E)
During the tests, the gauge pressure at the outlet of each water meter shall be at least 0,03 MPa (0,3 bar)
and shall be sufficient to prevent cavitation.
It shall be possible to carry out test readings rapidly and easily.
7.2.2.2 Group testing of meters
Meters are tested either individually or in groups. In the latter case, the individual characteristics of
the meters shall be precisely determined. The presence of any meter in the test rig shall not contribute
significantly to the test error of any other meter.
7.2.2.3 Location
The environment chosen for meter tests shall be in accordance with the principles elaborated in
OIML G 13 and shall be free from disturbing influences (e.g. ambient temperature, vibration).
7.3 Static pressure test (ISO 4064-1:2014|OIML R 49-1:2013, 4.2.10)
7.3.1 Object of the test
To verify that the water meter can withstand the specified hydraulic test pressure for the specified time
without leakage or damage.
7.3.2 Preparation
a) Install the meters in the test rig either singly or in groups.
b) Bleed the test rig pipework and the water meters of air.
c) Ensure that the test rig is free from leaks.
d) Ensure that the supply pressure is free from pressure pulsations.
7.3.3 Test procedure
7.3.3.1 In-line meters
a) Increase the hydraulic pressure to 1,6 times the maximum admissible pressure (MAP) of the meter
and hold it for 15 min.
b) Examine the meters for physical damage, for external leaks and for leaks into the indicating device.
c) Increase the hydraulic pressure to twice the MAP and hold this pressure level for 1 min.
d) Examine the meters for physical damage, for external leaks and for leaks into the indicating device.
e) Complete the test report in ISO 4064-3:2014|OIML R 49-3:2013, 4.5.1.
Additional requirements:
1) Increase and decrease the pressure gradually without pressure surges.
2) Apply only the reference temperatures for this test.
3) The flow rate shall be zero during the test.
7.3.3.2 Concentric meters
The test procedure in 7.3.3.1 also applies to pressure testing of concentric water meters; however, the
seals located at the concentric meter/manifold interface (see example in Figure E.1) shall also be tested
ISO 4064-2:2014(E)
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