SIST ISO 4064-3:2006

Measurement of water flow in fully charged closed conduits -- Meters for cold potable water and hot water -- Part 3: Test methods and equipment

This part of ISO 4064 specifies the test methods and means to be employed in determining the principal characteristics of water meters. This part of ISO 4064 is applicable to cold potable water and hot water concentric and combination meters, which can withstand maximum admissible working pressures (MAP) equal to at least 1 MPa (10 bar) 0,6 MPa (6 bar) for meters W DN 500 mm and a maximum admissible temperature for cold potable water meters of 30 °C and for hot water meters of up to 180 °C, depending on the class. This part of ISO 4064 also applies to water meters based on electrical or electronic principles and to water meters based on mechanical principles incorporating electrical devices, used to meter the actual volume flow of cold potable water and hot potable water. In the case where water meters have a permanent flowrate of less than 160 m3/h, in order to meet individual test laboratory limitations the test schedule may make provisions for modification of the reference conditions, when testing specifically for endurance or for performance under influence quantities. NOTE Attention is drawn to the fact that national legislation may apply in the country.

Mesurage de débit d'eau dans les conduites fermées en pleine charge -- Compteurs d'eau potable froide et d'eau chaude -- Partie 3: Méthodes et matériels d'essai

Merjenje pretoka vode v popolnoma zaprtih vodih – Merila za hladno pitno vodo in vročo vodo – 3. del: Preskusne metode in oprema

General Information

• Status: Withdrawn
• Publication Date: 31-Aug-2006
• Withdrawal Date: 19-Jan-2015
• ICS: 91.140.60 - Water supply systems
• Technical Committee: IMIN - Measurement instruments
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 16-Jan-2015
• Due Date: 08-Feb-2015
• Completion Date: 20-Jan-2015
• Ref Project: ISO 4064-3:2005 - Measurement of water flow in fully charged closed conduits — Meters for cold potable water and hot water — Part 3: Test methods and equipment

Relations

• Replaced By: SIST EN ISO 4064-3:2014 - Water meters for cold potable water and hot water - Part 3: Test report format (ISO 4064-3:2014)
• Effective Date: 01-Mar-2015
• Replaces: SIST ISO 7858-3:1996 - Measurement of water flow in closed conduits -- Meters for cold potable water -- Combination meters -- Part 3: Test methods
• Effective Date: 01-Sep-2006
• Replaces: SIST ISO 4064-3:2001 - Measurement of water flow in closed conduits -- Meters for cold potable water -- Part 3: Test methods and equipment
• Effective Date: 01-Sep-2006

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 4064-3
Third edition
2005-10-15


Measurement of water flow in fully
charged closed conduits — Meters for
cold potable water and hot water —
Part 3:
Test methods and equipment
Mesurage de débit d'eau dans les conduites fermées en pleine
charge — Compteurs d'eau potable froide et d'eau chaude —
Partie 3: Méthodes et matériels d'essai





Reference number
ISO 4064-3:2005(E)
©
ISO 2005

---------------------- Page: 1 ----------------------
ISO 4064-3:2005(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.


©  ISO 2005
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland

ii © ISO 2005 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 4064-3:2005(E)
Contents Page
Foreword. v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 3
4 Requirements common to all tests . 3
4.1 Preliminary requirements . 3
4.2 Water quality . 3
4.3 Other reference conditions. 4
4.4 Location . 4
5 Tests to determine errors of indication. 4
5.1 General. 4
5.2 Principle. 4
5.3 Description of the test bench . 4
5.4 Pipework . 5
5.5 Calibrated reference device. 8
5.6 Meter reading . 8
5.7 Major factors affecting the determination of errors of indication . 9
5.8 Intrinsic errors (of indication). 10
5.9 Water temperature tests. 11
5.10 Internal pressure tests . 11
5.11 Flow reversal tests. 11
5.12 Irregularity in velocity fields tests. 12
5.13 Interpretation of results. 14
6 Static pressure tests. 14
6.1 Object of tests . 14
6.2 Preparation . 14
6.3 Test procedure – In-line meters . 14
6.4 Test procedure – Concentric meters . 14
6.5 Acceptance criteria. 15
7 Pressure-loss test. 15
7.1 Object of test . 15
7.2 Preparation . 15
7.3 Test procedure . 16
7.4 Acceptance criteria. 17
8 Durability tests . 19
8.1 Continuous flow test . 19
8.2 Discontinuous flow test . 21
9 Performance tests for electronic water meters and mechanical meters fitted with
electronic devices. 24
9.1 Introduction . 24
9.2 General requirements. 25
9.3 Climatic and mechanical environment .27
9.4 Electromagnetic environment . 33
9.5 Power supply. 37
10 Test programme for pattern approval. 43
10.1 General. 43
10.2 Performance tests applicable to all water meters . 44
© ISO 2005 – All rights reserved iii

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ISO 4064-3:2005(E)
10.3 Electronic water meters, mechanical water meters fitted with electronic devices, and their
separable parts. 44
10.4 Pattern approval of separable parts of a water meter. 44
11 Tests for initial verification . 45
11.1 General . 45
11.2 Static pressure test. 45
11.3 Error of indication measurements . 45
11.4 Water temperature of tests. 46
12 Test report. 46
12.1 General . 46
12.2 Pattern approval test report — Required contents. 47
Annex A (normative) Calculating the relative error of indication of a water meter . 50
Annex B (normative) Flow disturbance test equipment. 55
Annex C (informative) Manifold — Examples of methods and components used for testing
concentric water meters. 69

iv © ISO 2005 – All rights reserved

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ISO 4064-3:2005(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 4064-3 was prepared by Technical Committee ISO/TC 30, Measurement of fluid flow in closed conduits,
Subcommittee SC 7, Volume methods including water meters.
This third edition cancels and replaces the second edition (ISO 4064-3:1999), which has been technically
revised, as well as cancelling and replacing ISO 7858-3:1992.
ISO 4064 consists of the following parts, under the general title Measurement of water flow in fully charged
closed conduits — Meters for cold potable water and hot water:
⎯ Part 1: Specifications
⎯ Part 2: Installation requirements
⎯ Part 3: Test methods and equipment

© ISO 2005 – All rights reserved v

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INTERNATIONAL STANDARD ISO 4064-3:2005(E)

Measurement of water flow in fully charged closed conduits —
Meters for cold potable water and hot water —
Part 3:
Test methods and equipment
1 Scope
This part of ISO 4064 specifies the test methods and means to be employed in determining the principal
characteristics of water meters.
This part of ISO 4064 is applicable to cold potable water and hot water concentric and combination meters,
which can withstand maximum admissible working pressures (MAP) equal to at least 1 MPa (10 bar) 0,6 MPa
(6 bar) for meters W DN 500 mm and a maximum admissible temperature for cold potable water meters of
30 °C and for hot water meters of up to 180 °C, depending on the class.
This part of ISO 4064 also applies to water meters based on electrical or electronic principles and to water
meters based on mechanical principles incorporating electrical devices, used to meter the actual volume flow
of cold potable water and hot potable water.
3
In the case where water meters have a permanent flowrate of less than 160 m /h, in order to meet individual
test laboratory limitations the test schedule may make provisions for modification of the reference conditions,
when testing specifically for endurance or for performance under influence quantities.
NOTE Attention is drawn to the fact that national legislation may apply in the country of use, which will take
precedence over the provisions of this part of ISO 4064.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,
tolerances and designation
ISO 286-2, ISO system of limits and fits — Part 2: Tables of standard tolerance grades and limit deviations for
holes and shafts
ISO 4064-1:2005, Measurement of water flow in fully charged closed conduits — Meters for cold potable
water and hot water — Part 1: Specifications
ISO 4064-2, Measurement of water flow in fully charged closed conduits — Meters for cold potable water and
hot water — Part 2: Installation requirements
ISO 5168, Measurement of fluid flow — Procedures for the evaluation of uncertainties
ISO 7005-2, Metallic flanges — Part 2: Cast iron flanges
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ISO 4064-3:2005(E)
ISO 7005-3, Metallic flanges — Part 3: Copper alloy and composite flanges
ISO Guide to the expression of uncertainty in measurement (GUM), 1995
IEC 60068-1:1988, Environmental testing — Part 1: General and guidance
IEC 60068-2-1:1974, Environmental testing — Part 2 Tests. Tests A: Cold
IEC 60068-2-2:1993, Environmental testing — Part 2: Tests. Tests B: Dry heat
IEC 60068-2-30:1980, Environmental testing — Part 2 Tests. Test Db and guidance: Damp heat, cyclic
(12h + 12h cycle)
IEC 60068-2-31:1993, Environmental testing — Part 2 Tests. Test Ec: Drop and topple, primarily for
equipment-type specimens
IEC 60068-2-47:1999, Environmental testing — Part 2-47:Test: — Mounting of components, equipment and
other articles for vibration, impact and similar dynamic tests
IEC 60068-2-64:1993, Environmental testing — Part 2: Test methods — Test Fh: Vibration, broad-band
random (digital control) and guidance
IEC 60068-3-1:1974, Environmental testing — Part 3: Background information — Section One: Cold and dry
heat tests
IEC 60068-3-4:2001, Environmental testing — Part 3-4: Supporting documentation and guidance — Damp
heat tests
IEC 61000-4-2:1995, Electromagnetic compatibility (EMC) — Part 4: Testing and measurement techniques —
Section 2: Electrostatic discharge immunity test. Basic EMC Publication
IEC 61000-4-3 Electromagnetic compatibility (EMC) — Part 4-3: Testing and measurement techniques —
Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-4:1995, Electromagnetic Compatibility (EMC) — Part 4-5: Testing and Measurement
Techniques — Surge Immunity Tests
IEC 61000-4-5:1995, Electromagnetic Compatibility (EMC) — Testing and measurement techniques —
Part 4-5: Surge immunity test
IEC 61000-4-11:1994, Electromagnetic compatibility (EMC) — Part 4-11: Testing and measurement
techniques — Voltage dips, short interruptions and voltage variations immunity tests
ENV 50204:1995, Radiated electromagnetic field from digital radio telephones. Immunity test
OIML D 4:1981, Installation and storage conditions for cold water meters
OIML D 11:1994, General requirements for electronic measuring instruments
OIML G 13:1989, Planning of metrology and testing laboratories (P 7)
2 © ISO 2005 – All rights reserved

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ISO 4064-3:2005(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4064-1 and the following apply.
3.1
combination meter changeover flowrate with decreasing flow
Q
x1
flowrate occurring when the pressure drop in the combination meter increases suddenly in parallel with a
cessation of flow in the larger meter and a visible increase in flow in the smaller meter
3.2
combination meter changeover flowrate with increasing flow
Q
x2
flowrate occurring when the pressure drop in the combination meter decreases suddenly in parallel with a
start-up of flow in the larger meter and a visible reduction in the flow in the smaller meter.
3.3
relative error
ε
error, expressed as a percentage, defined by the equation:
VV−
ia
ε=×100
V
a
where
V is the indicated volume;
i
V is the actual volume.
a
NOTE More detail is provided in Annex A. ISO 4064-1 gives the maximum permissible errors.
3.4
test flowrate
mean flowrate calculated from the indication of the calibrated reference device and the test duration
4 Requirements common to all tests
4.1 Preliminary requirements
Before starting testing, a written test programme shall be compiled, and shall include, e.g. a description of the
tests for the determination of measurement error, pressure loss and wear resistance. The programme may
also define the necessary levels of acceptability and stipulate how the test results should be interpreted.
4.2 Water quality
Water meter tests shall use water. The water shall be that of the public potable water supply or shall meet the
same requirements. If water is being recycled, measures shall be taken to prevent residual water in the meter
from becoming harmful to human beings.
The water shall not contain anything capable of damaging the meter or adversely affecting its operation.
It shall not contain air bubbles.
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ISO 4064-3:2005(E)
4.3 Other reference conditions
All other applicable influence quantities, except for the influence quantity being tested, shall be held at the
following values during pattern approval tests on a water meter:
Flowrate: 0,7 × (Q + Q ) ± 0,03 × (Q + Q )
2 3 2 3
1)
Ambient temperature range: 15 °C to 25 °C
1)
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 a.c.): Nominal voltage (U ) ± 5 %
nom
Power supply frequency: Nominal frequency (f ) ± 2 %
nom
Power supply voltage (battery): A voltage V in the range; U u V u U

bmin bmax
Working water temperature: See ISO 4064-1:2005, 5.4.1, Table 5
Working water pressure: 200 kPa (2 bar)
During each test, the temperature and relative humidity shall not vary by more than 5 °C or 10 % respectively
within the reference range.
4.4 Location
The environment chosen for the meter tests shall be in accordance with the principles of OIML G 13, and shall
be free from unintended disturbing influences, e.g. ambient temperature variation and vibration.
5 Tests to determine errors of indication
5.1 General
The method described in this part of ISO 4064 to determine measurement errors is the so-called “collection”
method in which the quantity of water passed through the water meter is collected in one or more collecting
vessels and the quantity determined volumetrically or by weighing. Other methods may be used, provided the
accuracy levels of testing stated in this part of ISO 4064 be attained.
Checking facilities of electronic devices is included in this section.
5.2 Principle
The checking of the measurement error consists of comparing the indications given by the meter under test
against a calibrated reference device.
5.3 Description of the test bench
The test bench typically consists of:
a) a water supply (mains, non-pressurized tank, pressurized tank, pump, etc.);
b) pipework;

1) When the ambient temperature and/or ambient relative humidity exceed the above-mentioned ranges, the effect on
the error of indication shall be taken into account.
4 © ISO 2005 – All rights reserved

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ISO 4064-3:2005(E)
c) a calibrated reference device (calibrated tank, reference meter, etc.);
d) means for measuring the time of the test;
e) devices for automating the test;
f) means for measuring water temperature;
g) means for measuring water pressure;
h) means for determining density, if necessary;
i) means for determining conductivity, if necessary.
5.4 Pipework
5.4.1 Description
Pipework shall include:
a) a test section in which the meter(s) is (are) placed;
b) means for establishing the desired flowrate;
c) one or two isolating devices;
d) means for determining the flowrate;
and, if necessary:
e) one or more air bleeds;
f) a non-return device;
g) an air separator;
h) a filter;
i) means for checking that the pipework is filled to a datum level before and after test.
During the test, flow leakage, flow input and flow drainage shall not occur between the meter(s) and the
reference device or from the reference device.
The pipework shall be such that at the outlet of all meters a positive pressure exists of at least 0,3 bar at any
flowrate.
5.4.2 Test section
The test section includes, in addition to the meter(s):
a) one or more pressure tappings for the measurement of pressure, of which one pressure tapping is
situated upstream of, and close to, the (first) meter;
b) if necessary, means for measuring the temperature of the water at the entry to the (first) meter.
None of the pipe components or devices placed in the measuring section shall cause cavitation or flow
disturbances capable of altering the performance of the meters or causing measurement errors.
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ISO 4064-3:2005(E)
5.4.3 Precautions to be taken during tests
The operation of the test bench shall be such that the quantity of water which has flowed through the meter(s)
equals that measured by the reference device.
Checks shall be made to ensure that pipes (e.g., the swan neck in the outlet pipe) are filled to the same datum
level at the beginning and at the end of the test.
Air shall be bled from the interconnecting pipework and the meter(s).
All precautions shall be taken to avoid the effects of vibration and shock.
5.4.4 Special arrangements for the installation of certain types of meter
5.4.4.1 Principles
The provisions of the following subclauses address the most frequent causes of error and the necessary
precautions for the installation of water meters on the test bench and are prompted by the recommendations
of OIML D 4, which aims to help achieve a test installation where:
a) the hydrodynamic flow characteristics cause no discernible difference to the meter functioning when
compared with hydrodynamic flow characteristics which are undisturbed;
b) the overall error of the method employed does not exceed the stipulated value (see 5.5.1).
5.4.4.2 Need for straight lengths of pipe or a flow straightener
The accuracy of non-volumetric water meters can be affected by upstream and downstream disturbances
caused by the presence and location of elbows, tees, valves or pumps, etc.
In order to counteract these effects, the meter under test (MUT) shall be installed between straight lengths of
pipe. The internal diameters of the upstream and downstream connecting pipework shall be the same as the
internal diameter of the water meter’s connecting ends. Moreover, it may be necessary to put a flow
straightener upstream of the straight length.
5.4.4.3 Common causes of flow disturbance
Flow can be subject to two types of disturbance, namely velocity profile distortion and swirl, both of which can
affect the accuracy of the water meter.
See ISO 4064-2 for details of installation requirements.
5.4.4.4 Volumetric water meters
Volumetric water meters (i.e., involving measuring chambers with mobile walls), such as oscillating piston and
nutating disc meters, are considered insensitive to upstream installation conditions; hence no special
recommendations are required.
5.4.4.5 Velocity type water meters
Velocity type water meters are sensitive to flow disturbance, which can cause significant errors, but the way
installation conditions affect their accuracy has not yet been clearly determined.
6 © ISO 2005 – All rights reserved

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ISO 4064-3:2005(E)
5.4.4.6 Other measuring principles
Other types of meter may or may not require flow conditioning for accuracy tests. If required, manufacturers’
recommendations shall be used during testing. Those recommendations shall be included in the pattern
approval documents.
These installation requirements should be reported in the pattern approval certificate for the water meter.
Concentric meters that are proven to be unaffected by manifold configuration (typically of the volumetric type –
see 5.4.4.4) may be tested and used with any suitable manifold arrangement.
5.4.4.7 Electromagnetic induction meters
Meters employing the principle of electromagnetic induction may be affected by the conductivity of the test
water. The test water should have a conductivity within the range of values specified by the manufacturer.
5.4.5 Test commencement and determination of errors
5.4.5.1 Principles
Adequate precautions shall be taken to reduce the uncertainties resulting from the operation of the test bench
components during the test. Details of the precautions to be taken are given in 5.4.5.2 and 5.4.5.3 for two
cases encountered in the “collection” method.
5.4.5.2 Tests with readings taken with the meter at rest
The flow is established by opening a valve situated downstream of the meter, and is stopped by the closure of
this valve. The meter should be read after registration stops.
Time is measured between the start of the opening movement of the valve and the close of the closing
movement.
While flow begins, and during the period of running at the specified constant flowrate, the error of indication of
the meter varies as a function of the changes in flowrate (measurement error curve).
When the flow is stopped, the combination of the inertia of the moving parts of the meter and the rotational
movement of the water inside the meter may cause an appreciable error to be introduced in certain types of
meter and for certain test flowrates.
NOTE In this case, it has not been possible to determine a simple empirical rule, which lays down conditions so that
this error may always be discounted as negligible. Certain types of meter are particularly sensitive to such error.
In case of doubt, it is advisable:
a) to increase the volume and duration of the test;
b) to compare the results with those obtained by one or more other methods, and in particular the method
described in 5.4.5.3, which eliminates the causes of uncertainty given above.
For some types of electronic water meters with pulse outputs, which are used for testing, the response of the
meter to changes in flowrate may be such that valid pulses are emitted after closure of the valve. In this case
means shall be provided to count these additional pulses.
Where pulse outputs are used for testing meters, a check shall be made that the volume indicated by the
pulse count corresponds to the volume displayed on the indicating device within the accuracy of registration.
© ISO 2005 – All rights reserved
...

SLOVENSKI STANDARD
SIST ISO 4064-3:2006
01-september-2006
0HUMHQMHSUHWRNDYRGHYSRSROQRPD]DSUWLKYRGLK±0HULOD]DKODGQRSLWQRYRGRLQ
YURþRYRGR±GHO3UHVNXVQHPHWRGHLQRSUHPD
Measurement of water flow in fully charged closed conduits -- Meters for cold potable
water and hot water -- Part 3: Test methods and equipment
Mesurage de débit d'eau dans les conduites fermées en pleine charge -- Compteurs
d'eau potable froide et d'eau chaude -- Partie 3: Méthodes et matériels d'essai
Ta slovenski standard je istoveten z: ISO 4064-3:2005
ICS:
91.140.60 Sistemi za oskrbo z vodo Water supply systems
SIST ISO 4064-3:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 4064-3:2006

---------------------- Page: 2 ----------------------

SIST ISO 4064-3:2006

INTERNATIONAL ISO
STANDARD 4064-3
Third edition
2005-10-15


Measurement of water flow in fully
charged closed conduits — Meters for
cold potable water and hot water —
Part 3:
Test methods and equipment
Mesurage de débit d'eau dans les conduites fermées en pleine
charge — Compteurs d'eau potable froide et d'eau chaude —
Partie 3: Méthodes et matériels d'essai





Reference number
ISO 4064-3:2005(E)
©
ISO 2005

---------------------- Page: 3 ----------------------

SIST ISO 4064-3:2006
ISO 4064-3:2005(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.


©  ISO 2005
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland

ii © ISO 2005 – All rights reserved

---------------------- Page: 4 ----------------------

SIST ISO 4064-3:2006
ISO 4064-3:2005(E)
Contents Page
Foreword. v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 3
4 Requirements common to all tests . 3
4.1 Preliminary requirements . 3
4.2 Water quality . 3
4.3 Other reference conditions. 4
4.4 Location . 4
5 Tests to determine errors of indication. 4
5.1 General. 4
5.2 Principle. 4
5.3 Description of the test bench . 4
5.4 Pipework . 5
5.5 Calibrated reference device. 8
5.6 Meter reading . 8
5.7 Major factors affecting the determination of errors of indication . 9
5.8 Intrinsic errors (of indication). 10
5.9 Water temperature tests. 11
5.10 Internal pressure tests . 11
5.11 Flow reversal tests. 11
5.12 Irregularity in velocity fields tests. 12
5.13 Interpretation of results. 14
6 Static pressure tests. 14
6.1 Object of tests . 14
6.2 Preparation . 14
6.3 Test procedure – In-line meters . 14
6.4 Test procedure – Concentric meters . 14
6.5 Acceptance criteria. 15
7 Pressure-loss test. 15
7.1 Object of test . 15
7.2 Preparation . 15
7.3 Test procedure . 16
7.4 Acceptance criteria. 17
8 Durability tests . 19
8.1 Continuous flow test . 19
8.2 Discontinuous flow test . 21
9 Performance tests for electronic water meters and mechanical meters fitted with
electronic devices. 24
9.1 Introduction . 24
9.2 General requirements. 25
9.3 Climatic and mechanical environment .27
9.4 Electromagnetic environment . 33
9.5 Power supply. 37
10 Test programme for pattern approval. 43
10.1 General. 43
10.2 Performance tests applicable to all water meters . 44
© ISO 2005 – All rights reserved iii

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SIST ISO 4064-3:2006
ISO 4064-3:2005(E)
10.3 Electronic water meters, mechanical water meters fitted with electronic devices, and their
separable parts. 44
10.4 Pattern approval of separable parts of a water meter. 44
11 Tests for initial verification . 45
11.1 General . 45
11.2 Static pressure test. 45
11.3 Error of indication measurements . 45
11.4 Water temperature of tests. 46
12 Test report. 46
12.1 General . 46
12.2 Pattern approval test report — Required contents. 47
Annex A (normative) Calculating the relative error of indication of a water meter . 50
Annex B (normative) Flow disturbance test equipment. 55
Annex C (informative) Manifold — Examples of methods and components used for testing
concentric water meters. 69

iv © ISO 2005 – All rights reserved

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SIST ISO 4064-3:2006
ISO 4064-3:2005(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 4064-3 was prepared by Technical Committee ISO/TC 30, Measurement of fluid flow in closed conduits,
Subcommittee SC 7, Volume methods including water meters.
This third edition cancels and replaces the second edition (ISO 4064-3:1999), which has been technically
revised, as well as cancelling and replacing ISO 7858-3:1992.
ISO 4064 consists of the following parts, under the general title Measurement of water flow in fully charged
closed conduits — Meters for cold potable water and hot water:
⎯ Part 1: Specifications
⎯ Part 2: Installation requirements
⎯ Part 3: Test methods and equipment

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INTERNATIONAL STANDARD ISO 4064-3:2005(E)

Measurement of water flow in fully charged closed conduits —
Meters for cold potable water and hot water —
Part 3:
Test methods and equipment
1 Scope
This part of ISO 4064 specifies the test methods and means to be employed in determining the principal
characteristics of water meters.
This part of ISO 4064 is applicable to cold potable water and hot water concentric and combination meters,
which can withstand maximum admissible working pressures (MAP) equal to at least 1 MPa (10 bar) 0,6 MPa
(6 bar) for meters W DN 500 mm and a maximum admissible temperature for cold potable water meters of
30 °C and for hot water meters of up to 180 °C, depending on the class.
This part of ISO 4064 also applies to water meters based on electrical or electronic principles and to water
meters based on mechanical principles incorporating electrical devices, used to meter the actual volume flow
of cold potable water and hot potable water.
3
In the case where water meters have a permanent flowrate of less than 160 m /h, in order to meet individual
test laboratory limitations the test schedule may make provisions for modification of the reference conditions,
when testing specifically for endurance or for performance under influence quantities.
NOTE Attention is drawn to the fact that national legislation may apply in the country of use, which will take
precedence over the provisions of this part of ISO 4064.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,
tolerances and designation
ISO 286-2, ISO system of limits and fits — Part 2: Tables of standard tolerance grades and limit deviations for
holes and shafts
ISO 4064-1:2005, Measurement of water flow in fully charged closed conduits — Meters for cold potable
water and hot water — Part 1: Specifications
ISO 4064-2, Measurement of water flow in fully charged closed conduits — Meters for cold potable water and
hot water — Part 2: Installation requirements
ISO 5168, Measurement of fluid flow — Procedures for the evaluation of uncertainties
ISO 7005-2, Metallic flanges — Part 2: Cast iron flanges
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ISO 7005-3, Metallic flanges — Part 3: Copper alloy and composite flanges
ISO Guide to the expression of uncertainty in measurement (GUM), 1995
IEC 60068-1:1988, Environmental testing — Part 1: General and guidance
IEC 60068-2-1:1974, Environmental testing — Part 2 Tests. Tests A: Cold
IEC 60068-2-2:1993, Environmental testing — Part 2: Tests. Tests B: Dry heat
IEC 60068-2-30:1980, Environmental testing — Part 2 Tests. Test Db and guidance: Damp heat, cyclic
(12h + 12h cycle)
IEC 60068-2-31:1993, Environmental testing — Part 2 Tests. Test Ec: Drop and topple, primarily for
equipment-type specimens
IEC 60068-2-47:1999, Environmental testing — Part 2-47:Test: — Mounting of components, equipment and
other articles for vibration, impact and similar dynamic tests
IEC 60068-2-64:1993, Environmental testing — Part 2: Test methods — Test Fh: Vibration, broad-band
random (digital control) and guidance
IEC 60068-3-1:1974, Environmental testing — Part 3: Background information — Section One: Cold and dry
heat tests
IEC 60068-3-4:2001, Environmental testing — Part 3-4: Supporting documentation and guidance — Damp
heat tests
IEC 61000-4-2:1995, Electromagnetic compatibility (EMC) — Part 4: Testing and measurement techniques —
Section 2: Electrostatic discharge immunity test. Basic EMC Publication
IEC 61000-4-3 Electromagnetic compatibility (EMC) — Part 4-3: Testing and measurement techniques —
Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-4:1995, Electromagnetic Compatibility (EMC) — Part 4-5: Testing and Measurement
Techniques — Surge Immunity Tests
IEC 61000-4-5:1995, Electromagnetic Compatibility (EMC) — Testing and measurement techniques —
Part 4-5: Surge immunity test
IEC 61000-4-11:1994, Electromagnetic compatibility (EMC) — Part 4-11: Testing and measurement
techniques — Voltage dips, short interruptions and voltage variations immunity tests
ENV 50204:1995, Radiated electromagnetic field from digital radio telephones. Immunity test
OIML D 4:1981, Installation and storage conditions for cold water meters
OIML D 11:1994, General requirements for electronic measuring instruments
OIML G 13:1989, Planning of metrology and testing laboratories (P 7)
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3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4064-1 and the following apply.
3.1
combination meter changeover flowrate with decreasing flow
Q
x1
flowrate occurring when the pressure drop in the combination meter increases suddenly in parallel with a
cessation of flow in the larger meter and a visible increase in flow in the smaller meter
3.2
combination meter changeover flowrate with increasing flow
Q
x2
flowrate occurring when the pressure drop in the combination meter decreases suddenly in parallel with a
start-up of flow in the larger meter and a visible reduction in the flow in the smaller meter.
3.3
relative error
ε
error, expressed as a percentage, defined by the equation:
VV−
ia
ε=×100
V
a
where
V is the indicated volume;
i
V is the actual volume.
a
NOTE More detail is provided in Annex A. ISO 4064-1 gives the maximum permissible errors.
3.4
test flowrate
mean flowrate calculated from the indication of the calibrated reference device and the test duration
4 Requirements common to all tests
4.1 Preliminary requirements
Before starting testing, a written test programme shall be compiled, and shall include, e.g. a description of the
tests for the determination of measurement error, pressure loss and wear resistance. The programme may
also define the necessary levels of acceptability and stipulate how the test results should be interpreted.
4.2 Water quality
Water meter tests shall use water. The water shall be that of the public potable water supply or shall meet the
same requirements. If water is being recycled, measures shall be taken to prevent residual water in the meter
from becoming harmful to human beings.
The water shall not contain anything capable of damaging the meter or adversely affecting its operation.
It shall not contain air bubbles.
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4.3 Other reference conditions
All other applicable influence quantities, except for the influence quantity being tested, shall be held at the
following values during pattern approval tests on a water meter:
Flowrate: 0,7 × (Q + Q ) ± 0,03 × (Q + Q )
2 3 2 3
1)
Ambient temperature range: 15 °C to 25 °C
1)
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 a.c.): Nominal voltage (U ) ± 5 %
nom
Power supply frequency: Nominal frequency (f ) ± 2 %
nom
Power supply voltage (battery): A voltage V in the range; U u V u U

bmin bmax
Working water temperature: See ISO 4064-1:2005, 5.4.1, Table 5
Working water pressure: 200 kPa (2 bar)
During each test, the temperature and relative humidity shall not vary by more than 5 °C or 10 % respectively
within the reference range.
4.4 Location
The environment chosen for the meter tests shall be in accordance with the principles of OIML G 13, and shall
be free from unintended disturbing influences, e.g. ambient temperature variation and vibration.
5 Tests to determine errors of indication
5.1 General
The method described in this part of ISO 4064 to determine measurement errors is the so-called “collection”
method in which the quantity of water passed through the water meter is collected in one or more collecting
vessels and the quantity determined volumetrically or by weighing. Other methods may be used, provided the
accuracy levels of testing stated in this part of ISO 4064 be attained.
Checking facilities of electronic devices is included in this section.
5.2 Principle
The checking of the measurement error consists of comparing the indications given by the meter under test
against a calibrated reference device.
5.3 Description of the test bench
The test bench typically consists of:
a) a water supply (mains, non-pressurized tank, pressurized tank, pump, etc.);
b) pipework;

1) When the ambient temperature and/or ambient relative humidity exceed the above-mentioned ranges, the effect on
the error of indication shall be taken into account.
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c) a calibrated reference device (calibrated tank, reference meter, etc.);
d) means for measuring the time of the test;
e) devices for automating the test;
f) means for measuring water temperature;
g) means for measuring water pressure;
h) means for determining density, if necessary;
i) means for determining conductivity, if necessary.
5.4 Pipework
5.4.1 Description
Pipework shall include:
a) a test section in which the meter(s) is (are) placed;
b) means for establishing the desired flowrate;
c) one or two isolating devices;
d) means for determining the flowrate;
and, if necessary:
e) one or more air bleeds;
f) a non-return device;
g) an air separator;
h) a filter;
i) means for checking that the pipework is filled to a datum level before and after test.
During the test, flow leakage, flow input and flow drainage shall not occur between the meter(s) and the
reference device or from the reference device.
The pipework shall be such that at the outlet of all meters a positive pressure exists of at least 0,3 bar at any
flowrate.
5.4.2 Test section
The test section includes, in addition to the meter(s):
a) one or more pressure tappings for the measurement of pressure, of which one pressure tapping is
situated upstream of, and close to, the (first) meter;
b) if necessary, means for measuring the temperature of the water at the entry to the (first) meter.
None of the pipe components or devices placed in the measuring section shall cause cavitation or flow
disturbances capable of altering the performance of the meters or causing measurement errors.
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5.4.3 Precautions to be taken during tests
The operation of the test bench shall be such that the quantity of water which has flowed through the meter(s)
equals that measured by the reference device.
Checks shall be made to ensure that pipes (e.g., the swan neck in the outlet pipe) are filled to the same datum
level at the beginning and at the end of the test.
Air shall be bled from the interconnecting pipework and the meter(s).
All precautions shall be taken to avoid the effects of vibration and shock.
5.4.4 Special arrangements for the installation of certain types of meter
5.4.4.1 Principles
The provisions of the following subclauses address the most frequent causes of error and the necessary
precautions for the installation of water meters on the test bench and are prompted by the recommendations
of OIML D 4, which aims to help achieve a test installation where:
a) the hydrodynamic flow characteristics cause no discernible difference to the meter functioning when
compared with hydrodynamic flow characteristics which are undisturbed;
b) the overall error of the method employed does not exceed the stipulated value (see 5.5.1).
5.4.4.2 Need for straight lengths of pipe or a flow straightener
The accuracy of non-volumetric water meters can be affected by upstream and downstream disturbances
caused by the presence and location of elbows, tees, valves or pumps, etc.
In order to counteract these effects, the meter under test (MUT) shall be installed between straight lengths of
pipe. The internal diameters of the upstream and downstream connecting pipework shall be the same as the
internal diameter of the water meter’s connecting ends. Moreover, it may be necessary to put a flow
straightener upstream of the straight length.
5.4.4.3 Common causes of flow disturbance
Flow can be subject to two types of disturbance, namely velocity profile distortion and swirl, both of which can
affect the accuracy of the water meter.
See ISO 4064-2 for details of installation requirements.
5.4.4.4 Volumetric water meters
Volumetric water meters (i.e., involving measuring chambers with mobile walls), such as oscillating piston and
nutating disc meters, are considered insensitive to upstream installation conditions; hence no special
recommendations are required.
5.4.4.5 Velocity type water meters
Velocity type water meters are sensitive to flow disturbance, which can cause significant errors, but the way
installation conditions affect their accuracy has not yet been clearly determined.
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5.4.4.6 Other measuring principles
Other types of meter may or may not require flow conditioning for accuracy tests. If required, manufacturers’
recommendations shall be used during testing. Those recommendations shall be included in the pattern
approval documents.
These installation requirements should be reported in the pattern approval certificate for the water meter.
Concentric meters that are proven to be unaffected by manifold configuration (typically of the volumetric type –
see 5.4.4.4) may be tested and used with any suitable manifold arrangement.
5.4.4.7 Electromagnetic induction meters
Meters employing the principle of electromagnetic induction may be affected by the conductivity of the test
water. The test water should have a conductivity within the range of values specified by the manufacturer.
5.4.5 Test commencement and determination of errors
5.4.5.1 Principles
Adequate precautions shall be taken to reduce the uncertainties resulting from the operation of the test bench
components during the test. Details of the precautions to be taken are given in 5.4.5.2 and 5.4.5.3 for two
cases encountered in the “collection” method.
5.4.5.2 Tests with readings taken with the meter at rest
The flow is established by opening a valve situated downstream of the meter, and is stopped by the closure of
this valve. The meter should be read after registration stops.
Time is measured between the start of the opening movement of the valve and the close of the closing
movement.
While flow begins, and during the period of running at the specified constant flowrate, the error of indication of
the meter varies as a function of the changes in flowrate (measurement error curve).
When the flow is stopped, the combination of the inertia
...