EN ISO 4064-1:2014

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
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WHKQLþQH]DKWHYH,62
Water meters for cold potable water and hot water - Part 1: Metrological and technical
requirements (ISO 4064-1:2014)
Wasserzähler zum Messen von kaltem Trinkwasser und heißem Wasser - Teil 1:
Metrologische und technische Anforderungen (ISO 4064-1:2014)
Compteurs d'eau potable froide et d'eau chaude - Partie 1: Exigences métrologiques et
techniques (ISO 4064-1:2014)
Ta slovenski standard je istoveten z: EN ISO 4064-1:2014
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 4064-1
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 1:
Metrological and technical requirements (ISO 4064-1:2014)
Compteurs d'eau potable froide et chaude - Partie 1: Wasserzähler zum Messen von kaltem Trinkwasser und
Exigences métrologiques et techniques (ISO 4064-1:2014) heißem Wasser - Teil 1: Metrologische und technische
Anforderungen (ISO 4064-1:2014)
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 4064-1:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of Requirements of EU Directive 2004/22/EC .4
Foreword
This document (EN ISO 4064-1:2014) 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 4064-1:2014 has been approved by CEN as EN ISO 4064-1:2014 without any modification.
Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of 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 4064-1
Fourth edition
2014-06-01
Water meters for cold potable water
and hot water —
Part 1:
Metrological and technical
requirements
Compteurs d’eau potable froide et d’eau chaude —
Partie 1: Exigences métrologiques et techniques
Reference number
ISO 4064-1:2014(E)
©
ISO 2014
ISO 4064-1:2014(E)
© ISO 2014
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested 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 copyright@iso.org
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Published in Switzerland
ii © ISO 2014 – All rights reserved

ISO 4064-1:2014(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Water meter and its constituents. 1
3.2 Metrological characteristics . 5
3.3 Operating conditions . 6
3.4 Test conditions . 8
3.5 Electronic and electrical equipment .10
3.6 Use of certain terms within the European Economic Area .11
4 Metrological requirements .11
4.1 Values of Q , Q , Q , and Q .
1 2 3 4 11
4.2 Accuracy class and maximum permissible error .12
4.3 Requirements for meters and ancillary devices .13
5 Water meters equipped with electronic devices .15
5.1 General requirements .15
5.2 Power supply .15
6 Technical requirements .16
6.1 Materials and construction of water meters .16
6.2 Adjustment and correction . .17
6.3 Installation conditions.17
6.4 Rated operating conditions .19
6.5 Pressure loss .19
6.6 Marks and inscriptions .19
6.7 Indicating device .21
6.8 Protection devices .24
7 Metrological controls .24
7.1 Reference conditions .24
7.2 Type evaluation and approval .25
7.3 Initial verification .29
Annex A (normative) Performance tests for water meters with electronic devices .31
Annex B (normative) Checking facilities .33
Annex C (informative) Permissible errors in service and subsequent verification .37
Bibliography .38
ISO 4064-1:2014(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 4064-1 cancels and partially replaces the third edition (ISO 4064-1:2005), which
has been technically revised. Some provisions of the third edition are addressed in ISO 4064-4:2014.
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 4064-1 is identical to the corresponding edition of OIML R 49-1, which has been
issued concurrently. OIML R 49-1 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. It will be submitted
to the International Conference on Legal Metrology in 2016 for formal sanction.
iv © ISO 2014 – All rights reserved

INTERNATIONAL STANDARD ISO 4064-1:2014(E)
Water meters for cold potable water and hot water —
Part 1:
Metrological and technical requirements
1 Scope
This part of ISO 4064|OIML R 49 specifies the metrological and technical requirements for water meters
for cold potable water and hot 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 principles, this part of ISO 4064|OIML R 49 applies to
devices based on electrical or electronic principles, and mechanical principles 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 regulations to render some ancillary devices
mandatory in relation to the utilization of water meters.
NOTE Any national regulations apply in the country of use.
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 4064-2:2014|OIML R 49-2:2013, Water meters for cold potable water and hot water — Part 2: Test
methods
3 Terms and definitions
For the purposes of this document, the following definitions apply.
[1]
NOTE This terminology conforms to that used in ISO/IEC Guide 99:2007|OIML V 2-200:2012, OIML V
[2] [3] [1] [3]
1:2013 and OIML D 11. Modified versions of some terms defined in References – are listed here.
3.1 Water meter and its constituents
3.1.1
water meter
instrument intended to measure continuously, memorize, 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 or
correction devices, if present) and an indicating device. These three devices can be in different housings.
Note 2 to entry: A water meter may be a combination meter (see 3.1.16).
Note 3 to entry: In this International Standard, a water meter is also referred to as a “meter”.
ISO 4064-1:2014(E)
3.1.2
measurement transducer
part of the meter that transforms the flow rate or volume of water to be measured into signals which are
passed to the calculator and includes the sensor
Note 1 to entry: The measurement transducer may function autonomously or use an external power source and
may be based on a mechanical, electrical or electronic principle.
3.1.3
sensor
element of a meter that is directly affected by a phenomenon, body or substance carrying a quantity to
be measured
[SOURCE: ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM), 3.8, modified — “meter” replaces “measuring
system”.]
Note 1 to entry: For a water meter, the sensor may be a disc, piston, wheel or turbine element, the electrodes on an
electromagnetic meter, or another element. The element senses the flow rate or volume of water passing through
the meter and is referred to as a “flow sensor” or “volume sensor”.
3.1.4
calculator
part of the meter that transforms the output signals from the measurement transducer(s) and, possibly,
from associated measuring instruments and, if appropriate, stores the results in memory until they are
used
Note 1 to entry: The gearing is considered to be the calculator in a mechanical meter.
Note 2 to entry: The calculator may be capable of communicating both ways with ancillary devices.
3.1.5
indicating device
part of the meter that provides an indication corresponding to the volume of water passing through the
meter
Note 1 to entry: For the definition of the term “indication”, see ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM),
4.1.
3.1.6
adjustment device
part of the meter that allows an adjustment of the meter such that the error curve of the meter is generally
shifted parallel to itself to fit in the envelope of the maximum permissible errors
Note 1 to entry: For the definition of the term “adjustment of a measuring system”, see ISO/IEC Guide 99:2007|OIML
V 2-200:2012 (VIM), 3.11.
3.1.7
correction device
device connected to or incorporated in the meter for automatic correction of the volume of water at
metering conditions, by taking into account the flow rate and/or the characteristics of the water to be
measured and the pre-established calibration curves
Note 1 to entry: The characteristics of the water, e.g. temperature and pressure, may be either measured using
associated measuring instruments or stored in a memory in the meter.
Note 2 to entry: For the definition of the term “correction”, see ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM),
2.53.
2 © ISO 2014 – All rights reserved

ISO 4064-1:2014(E)
3.1.8
ancillary device
device intended to perform a specific function, directly involved in elaborating, transmitting or
displaying measured values
Note 1 to entry: For the definition of “measured value”, see ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM), 2.10.
Note 2 to entry: The main ancillary devices are:
a) zero-setting device;
b) price-indicating device;
c) repeating indicating device;
d) printing device;
e) memory device;
f) tariff control device;
g) pre-setting device;
h) self-service device;
i) flow sensor movement detector (for detecting movement of the flow sensor before this is clearly
visible on the indicating device);
j) remote reading device (which may be incorporated permanently or added temporarily).
Note 3 to entry: Depending on national legislation, ancillary devices may be subject to legal metrological control.
3.1.9
tariff control device
device that allocates measured values into different registers depending on tariff or other criteria, each
register having the possibility to be read individually
3.1.10
pre-setting device
device that permits the selection of the quantity of water to be measured and which automatically stops
the flow of water after the selected quantity has been measured
3.1.11
associated measuring instrument
instrument connected to the calculator or the correction device for measuring a quantity, characteristic
of water, with a view to making a correction and/or a conversion
3.1.12
meter for two constant partners
meter that is permanently installed and only used for deliveries from one supplier to one customer
3.1.13
in-line meter
type of meter that is fitted into a closed conduit by means of the meter end connections provided
Note 1 to entry: The end connections may be flanged or threaded.
3.1.14
complete meter
meter whose measurement transducer, calculator, and indicating device are not separable
ISO 4064-1:2014(E)
3.1.15
combined meter
meter whose measurement transducer, calculator, and indicating device are separable
3.1.16
combination meter
meter comprising one large meter, one small meter, and a changeover device that, depending on the
magnitude of the flow rate passing through the meter, automatically directs the flow through either the
small or the large meter, or both
Note 1 to entry: The meter reading is obtained from two independent totalizers, or from one totalizer which adds
up the values from both water meters.
3.1.17
equipment under test
EUT
complete meter, sub-assembly or ancillary device that is subjected to a test
3.1.18
concentric meter
type of meter that is fitted into a closed conduit by means of a manifold
Note 1 to entry: The inlet and outlet passages of the meter and the manifold are coaxial at the interface between
them.
3.1.19
concentric meter manifold
pipe fitting specific to the connection of a concentric meter
3.1.20
cartridge meter
type of meter that is fitted into a closed conduit by means of an intermediate fitting called a connection
interface
Note 1 to entry: The inlet and outlet passages of the meter and the connection interface are either concentric or
axial as specified in ISO 4064-4.
3.1.21
cartridge meter connection interface
pipe fitting specific to the connection of an axial or concentric cartridge meter
3.1.22
meter with exchangeable metrological module
meter with a permanent flow rate ≥16 m /h, comprising a connection interface and an exchangeable
metrological module from the same type approval
3.1.23
exchangeable metrological module
self-contained module comprising a measurement transducer, a calculator and an indicating device
3.1.24
connection interface for meters with exchangeable metrological modules
pipe fitting specific to the connection of exchangeable metrological modules
4 © ISO 2014 – All rights reserved

ISO 4064-1:2014(E)
3.2 Metrological characteristics
3.2.1
actual volume
V
a
total volume of water passing through the meter, disregarding the time taken
Note 1 to entry: This is the measurand.
Note 2 to entry: The actual volume is calculated from a reference volume as determined by a suitable measurement
standard, taking into account differences in metering conditions, as appropriate.
3.2.2
indicated volume
V
i
volume of water indicated by the meter, corresponding to the actual volume
3.2.3
primary indication
indication which is subject to legal metrological control
3.2.4
error
measured quantity value minus a reference quantity value
[SOURCE: ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM), 2.16]
Note 1 to entry: For the application of this part of ISO 4064|OIML R 49, the indicated volume is considered as the
measured quantity value and the actual volume as the reference quantity value. The difference between indicated
volume and actual volume is referred to as: error (of indication).
Note 2 to entry: In this International Standard, the error (of indication) is expressed as a percentage of the actual
VV−
()
ia
volume, and is equal to: ×100%
V
a
3.2.5
maximum permissible error
MPE
extreme value of measurement error, with respect to a known reference quantity value, permitted by
specifications or regulations for a given meter
[SOURCE: ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM), 4.26, modified — “meter” replaces
“measurement, measuring instrument, or measuring system”]
3.2.6
intrinsic error
error of a meter determined under reference conditions
[SOURCE: OIML D 11:2013, 3.8, modified — “meter” replaces “measuring instrument,”]
3.2.7
initial intrinsic error
intrinsic error of a meter as determined prior to performance tests and durability evaluations
[SOURCE: OIML D 11:2013, 3.9, modified — “meter” replaces “measuring instrument”]
3.2.8
fault
difference between the error (of indication) and the intrinsic error of a meter
[SOURCE: OIML D 11:2013, 3.10, modified — “of indication” placed in parentheses; “meter” replaces
“measuring instrument”]
ISO 4064-1:2014(E)
3.2.9
significant fault
fault greater than the value specified in this part of ISO 4064|OIML R 49
[SOURCE: OIML D 11:2013, 3.12, modified — “this part of ISO 4064|OIML R 49” replaces “the relevant
Recommendation”]
Note 1 to entry: See 5.1.2, which specifies the value of a significant fault.
3.2.10
durability
ability of a meter to maintain its performance characteristics over a period of use
[SOURCE: OIML D 11:2013, 3.18, modified — “meter” replaces “measuring instrument”]
3.2.11
metering conditions
conditions of the water, the volume of which is to be measured, at the point of measurement
EXAMPLE Water temperature, water pressure.
3.2.12
first element of an indicating device
element which, in an indicating device comprising several elements, carries the graduated scale with the
verification scale interval
3.2.13
verification scale interval
lowest value scale division of the first element of an indicating device
3.2.14
resolution of a displaying device
smallest difference between displayed indications that can be meaningfully distinguished
[SOURCE: ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM), 4.15]
Note 1 to entry: For a digital indicating device, this is the change in the indication when the least significant digit
changes by one step.
3.3 Operating conditions
3.3.1
flow rate
Q
Q = dV/dt where V is actual volume and t is time taken for this volume to pass through the meter
[4]
Note 1 to entry: ISO 4006:1991, 4.1.2 prefers the use of the symbol q for this quantity, but Q is used in this
V
International Standard as it is well established in the industry.
3.3.2
permanent flow rate
Q
highest flow rate within the rated operating conditions at which the meter is to operate within the
maximum permissible errors
Note 1 to entry: In this International Standard, flow rate is expressed in m /h. See 4.1.3.
6 © ISO 2014 – All rights reserved

ISO 4064-1:2014(E)
3.3.3
overload flow rate
Q
highest flow rate at which the meter is to operate for a short period of time within the maximum
permissible errors, while maintaining its metrological performance when it is subsequently operating
within the rated operating conditions
3.3.4
transitional flow rate
Q
flow rate between the permanent flow rate and the minimum flow rate that divides the flow rate range
into two zones, the upper flow rate zone and the lower flow rate zone, each characterized by its own
maximum permissible errors
3.3.5
minimum flow rate
Q
lowest flow rate at which the meter is to operate within the maximum permissible errors
3.3.6
combination meter changeover flow rate
Q
x
flow rate at which the flow in the larger meter stops with decreasing flow rate (Q ) or starts with
x1
increasing flow rate (Q )
x2
3.3.7
minimum admissible temperature
mAT
minimum water temperature that a meter can withstand permanently, within its rated operating
conditions, without deterioration of its metrological performance
Note 1 to entry: mAT is the lower of the rated operating conditions for temperature.
3.3.8
maximum admissible temperature
MAT
maximum water temperature that a meter can withstand permanently, within its rated operating
conditions, without deterioration of its metrological performance
Note 1 to entry: MAT is the upper of the rated operating conditions for temperature.
3.3.9
maximum admissible pressure
MAP
maximum internal pressure that a meter can withstand permanently, within its rated operating
conditions, without deterioration of its metrological performance
3.3.10
working temperature
T
w
water temperature in the pipe measured upstream of the meter
3.3.11
working pressure
p
w
average water pressure (gauge) in the pipe measured upstream and downstream of the meter
ISO 4064-1:2014(E)
3.3.12
pressure loss
Δp
irrecoverable decrease in pressure, at a given flow rate, caused by the presence of the meter in the
pipeline
3.3.13
test flow rate
mean flow rate during a test, calculated from the indications of a calibrated reference device
3.3.14
nominal diameter
DN
alphanumeric designation of size for components of a pipework system, which is used for reference
purposes
Note 1 to entry: The nominal diameter is expressed by the letters DN followed by a dimensionless whole
number which is indirectly related to the physical size, in millimetres, of the bore or outside diameter of the end
connections.
Note 2 to entry: The number following the letters DN does not represent a measurable value and should not be
used for calculation purposes except where specified in the relevant standard.
Note 3 to entry: In those standards which use the DN designation system, any relationship between DN and
component dimensions should be given, e.g. DN/OD or DN/ID.
3.4 Test conditions
3.4.1
influence quantity
quantity that, in a direct measurement, does not affect the quantity that is actually measured, but affects
the relation between the indication and the measurement result
[SOURCE: ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM) 2.52]
EXAMPLE The ambient temperature of the meter is an influence quantity, whereas the temperature of the
water passing through the meter affects the measurand.
3.4.2
influence factor
influence quantity having a value within the rated operating conditions of a meter specified in this part
of ISO 4064|OIML R 49
[SOURCE: OIML D 11:2013, 3.15.1, modified — “meter” replaces “measuring instrument”; “this part of
ISO 4064|OIML R 49” replaces “the relevant Recommendation”]
3.4.3
disturbance
influence quantity having a value within the limits specified in this part of ISO 4064|OIML R 49, but
outside the specified rated operating conditions of the meter
[SOURCE: OIML D 11:2004, 3.15.2, modified — “this part of ISO 4064|OIML R 49” replaces “the relevant
Recommendation”; “meter” replaces “measuring instrument”]
Note 1 to entry: An influence quantity is a disturbance if the rated operating conditions for that influence quantity
are not specified.
8 © ISO 2014 – All rights reserved

ISO 4064-1:2014(E)
3.4.4
rated operating condition
ROC
operating condition requiring fulfilment during measurement in order that a meter perform as designed
[SOURCE: ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM), 4.9, modified — “requiring fulfilment”
replaces “that must be fulfilled”; “meter” replaces “measuring instrument or measuring system”]
Note 1 to entry: The rated operating conditions specify intervals for the flow rate and for the influence quantities
for which the errors (of indication) are required to be within the maximum permissible errors.
3.4.5
reference condition
operating condition prescribed for evaluating the performance of a meter or for comparison of
measurement results
[SOURCE: ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM), 4.11, modified — “meter” replaces
“measuring instrument or measuring system”]
3.4.6
performance test
test intended to verify whether the equipment under test is able to accomplish its intended functions
[SOURCE: OIML D 11:2013, 3.21.4]
3.4.7
durability test
test intended to verify whether the equipment under test is able to maintain its performance
characteristics over a period of use
[SOURCE: OIML D 11:2013, 3.21.5]
3.4.8
temperature stability
condition in which all parts of the equipment under test have a temperature within 3 °C of each other, or
as otherwise specified in the relevant specification of its final temperature
3.4.9
preconditioning
treatment of the equipment under test with the objective of eliminating or partially counteracting the
effects of its previous history
Note 1 to entry: Where called for, this is the first process in a test procedure.
3.4.10
conditioning
exposure of the equipment under test to an environmental condition (influence factor or disturbance) in
order to determine the effect of such a condition on it
3.4.11
recovery
treatment of the equipment under test, after conditioning, in order that its properties can be stabilized
before measurement
3.4.12
type evaluation
pattern evaluation
systematic examination and testing of the performance of one or more specimens of an identified
type or pattern of measuring instruments against documented requirements, the results of which are
contained in the evaluation report, in order to determine whether the type may be approved
Note 1 to entry: “Pattern” is used in legal metrology with the same meaning as “type”.
ISO 4064-1:2014(E)
[SOURCE: OIML V 1:2013, 2.04, modified — The term synonyms “type evaluation” and “pattern
evaluation” replace “type (pattern) evaluation”; “type or pattern” replaces “type (pattern)”]
3.4.13
type approval
decision of legal relevance, based on the evaluation report, that the type of a measuring instrument
complies with the relevant statutory requirements and is suitable for use in the regulated area in such a
way that it is expected to provide reliable measurement results over a defined period of time
[SOURCE: OIML V 1:2013, 2.05]
3.5 Electronic and electrical equipment
3.5.1
electronic device
device employing electronic sub-assemblies and performing a specific function, usually manufactured
as a separate unit and capable of being tested independently
[SOURCE: OIML D 11:2013, 3.2, modified — “function, usually manufactured as a separate unit and
capable” replaces “function. Electronic devices are usually manufactured as separate units and are
capable”]
Note 1 to entry: An electronic device may be a complete meter or a part of a meter, e.g. as defined in 3.1.1 to 3.1.5
and 3.1.8.
3.5.2
electronic sub-assembly
part of an electronic device, employing electronic components and having a recognizable function of its
own
[SOURCE: OIML D 11:2013, 3.3]
3.5.3
electronic component
smallest physical entity that uses electron or hole conduction in semi-conductors, gases or in a vacuum
[SOURCE: OIML D 11:2013, 3.4]
3.5.4
checking facility
facility that is incorporated in a meter and which enables significant faults to be detected and acted
upon
[SOURCE: OIML D 11:2013, 3.19, modified — “meter” replaces “measuring instrument”]
Note 1 to entry: The checking of a transmission device aims to verify whether all the information which is
transmitted (and only that information) is fully received by the receiving equipment.
3.5.5
automatic checking facility
checking facility that operates without the intervention of an operator
[SOURCE: OIML D 11:2013, 3.19.1]
3.5.6
permanent automatic checking facility
type P automatic checking facility
automatic checking facility that operates at each measurement cycle
[SOURCE: OIML D 11:2013, 3.19.1.1, modified — Synonym presentation]
10 © ISO 2014 – All rights reserved

ISO 4064-1:2014(E)
3.5.7
intermittent automatic checking facility
type I automatic checking facility
automatic checking facility that operates at certain time intervals or per fixed number of measurement
cycles
[SOURCE: OIML D 11:2013, 3.19.1.2, modified — Synonym presentation]
3.5.8
non-automatic checking facility
type N checking facility
checking facility that requires the intervention of an operator
[SOURCE: OIML D 11:2013, 3.19.2, modified — Synonym presentation]
3.6 Use of certain terms within the European Economic Area
Attention is drawn to the fact that the term “verification” or “initial verification” is equivalent to the
term “conformity assessment” in the context of application of the European Measuring Instruments
Directive.
4 Metrological requirements
4.1 Values of Q , Q , Q , and Q
1 2 3 4
4.1.1 The flow rate characteristics of a water meter shall be defined by the values of Q , Q , Q , and Q .
1 2 3 4
4.1.2 A water meter shall be designated by the numerical value of Q in m /h and the ratio Q /Q .
3 3 1
4.1.3 The value of Q , expressed in m /h, shall be chosen from the following list:
1 1,6 2,5 4 6,3
10 16 25 40 63
100 160 250 400 630
1 000 1 600 2 500 4 000 6 300
The list may be extended to higher or lower values in the series.
4.1.4 The value of the ratio Q /Q shall be chosen from the following list:
3 1
40 50 63 80 100
125 160 200 250 315
400 500 630 800 1 000
The list may be extended to higher values in the series.
[4]
NOTE The values in 4.1.3 and 4.1.4 are taken from ISO 3, R 5 and R 10 lines, respectively.
4.1.5 The ratio Q /Q shall be 1,6.
2 1
4.1.6 The ratio Q /Q shall be 1,25.
4 3
ISO 4064-1:2014(E)
4.2 Accuracy class and maximum permissible error
4.2.1 General
A water meter shall be designed and manufactured such that its errors (of indication) do not exceed the
maximum permissible errors (MPEs) as defined in 4.2.2 or 4.2.3 under rated operating conditions.
A water meter shall be designated as either accuracy class 1 or accuracy class 2, according to the
requirements of 4.2.2 or 4.2.3.
The meter manufacturer shall specify the accuracy class.
4.2.2 Accuracy class 1 water meters
The MPE for the upper flow rate zone (Q ≤ Q ≤ Q ) is ±1 %, for temperatures from 0,1 °C to 30 °C, and
2 4
±2 % for temperatures greater than 30 °C.
The MPE for the lower flow rate zone (Q ≤ Q < Q ) is ±3 % regardless of the temperature range.
1 2
4.2.3 Accuracy class 2 water meters
The MPE for the upper flow rate zone (Q ≤ Q ≤ Q ) is ±2 %, for temperatures from 0,1°C to 30 °C, and
2 4
±3 % for temperatures greater than 30 °C.
The MPE for the lower flow rate zone (Q ≤ Q < Q ) is ±5 % regardless of the temperature range.
1 2
4.2.4 Meter temperature classes
The meters fall under water temperature classes corresponding to the various ranges, chosen by the
manufacturer from the values given in Table 1.
The water temperature shall be measured at the inlet of the meter.
Table 1 — Meter temperature classes
mAT MAT
Class
°C °C
T30 0,1 30
T50 0,1 50
T70 0,1 70
T90 0,1 90
T130 0,1 130
T180 0,1 180
T30/70 30 70
T30/90 30 90
T30/130 30 130
T30/180 30 180
4.2.5 Water meters with separable calculator and measurement transducer
The calculator (including indicating device) and the measurement transducer (including flow sensor or
volume sensor) of a water meter, where they are separable and interchangeable with other calculators
and measurement transducers of the same or different designs, may be the subject of separate type
approvals. The MPEs of the combined indicating device and measurement transducer shall not exceed
the values given in 4.2.2 or 4.2.3 according to the accuracy class of the meter.
12 © ISO 2014 – All rights reserved

ISO 4064-1:2014(E)
4.2.6 Relative error of indication
The relative error (of indication) is expressed as a percentage, and is equal to:
VV−
()
ia
×100%
V
a
where V is as defined in 3.2.1 and V is as defined in 3.2.2.
a i
4.2.7 Reverse flow
The manufacturer shall specify whether or not a water meter is designed to measure reverse flow.
If a meter is designed to measure reverse flow, the volume passed during reverse flow shall either
be subtracted from the indicated volume or the meter shall record it separately. The MPE of 4.2.2 or
4.2.3 shall be met for both forward and reverse flow. For meters designed to measure reverse flow, the
permanent flow rate and the measuring range may be different in each direction.
If a meter is not designed to measure reverse flow, the meter shall either prevent reverse flow or it
shall withstand accidental reverse flow at a flow rate up to Q without deterioration or change in its
metrological properties for forward flow.
4.2.8 Water temperature and water pressure
The requirements relating to the MPEs shall be met for all temperature and pressure variations occurring
within the rated operating conditions of a water meter.
4.2.9 Absence of flow or of water
The water meter totalization shall not change in the absence either of flow or of water.
4.2.10 Static pressure
A water meter shall be capable of withs
...