Water meters for cold potable water and hot water - Part 1: Metrological and technical requirements (ISO 4064-1:2014)

ISO 4064-1:2014|OIML R 49-1:2013 specifies metrological and technical requirements of 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, ISO 4064-1:2014|OIML R 49-1:2013 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.
ISO 4064-1:2014|OIML R 49-1:2013 also applies to electronic ancillary devices. Ancillary devices are optional. However, it is possible for national or regional regulations to make some ancillary devices mandatory in relation to the utilization of water meters.

Wasserzähler zum Messen von kaltem Trinkwasser und heißem Wasser - Teil 1: Metrologische und technische Anforderungen (ISO 4064-1:2014)

Der vorliegende Teil der ISO 4064/OIML R 49 legt die metrologischen und technischen Anforderungen für Wasserzähler für kaltes Trink¬wasser und heißes Wasser fest, das durch eine vollkommen gefüllte, geschlossene Leitung fließt. Diese Wasserzähler sind mit Einrichtungen versehen, die das kumulierte Volumen anzeigen.
Zusätzlich zu den auf mechanischen Funktionsprinzipien beruhenden Wasserzählern gilt der vorliegende Teil der ISO 4064/OIML R 49 außerdem für Einrichtungen nach elektrischem oder elektronischem Funktions-prinzip und nach mechanischem Funktionsprinzip mit elektronischen Einrichtungen, die zur Messung des Volumens von kaltem Trinkwasser und heißem Wasser dienen.
Dieser Teil der ISO 4064/OIML R 49  gilt außerdem für elektronische Zusatzeinrichtungen. Zusatz-einrichtungen sind optional. Jedoch können in nationalen oder internationalen Regelungen einige Zusatzeinrichtungen hinsichtlich der Verwendung von Wasserzählern verbindlich vorgeschrieben sein.
ANMERKUNG   In den Anwendungsländern können nationale Vorschriften gelten.

Compteurs d'eau potable froide et d'eau chaude - Partie 1: Exigences métrologiques et techniques (ISO 4064-1:2014)

L'ISO 4064-1:2014|OIML R 49-1:2013 spécifie les exigences métrologiques et techniques applicables aux compteurs d'eau potable froide et d'eau chaude circulant dans une conduite fermée entièrement chargée. Ces compteurs d'eau comportent des dispositifs indiquant le volume compté.
En plus des compteurs d'eau dont le fonctionnement est basé sur des principes mécaniques, l'ISO 4064-1:2014|OIML R 49-1:2013 s'applique aux dispositifs dont le fonctionnement est basé sur un principe électrique ou électronique, ainsi qu'à un fonctionnement mécanique incluant des dispositifs électroniques utilisés pour mesurer le volume débité d'eau potable froide et d'eau chaude.
L'ISO 4064-1:2014|OIML R 49-1:2013 s'applique également à des dispositifs électroniques auxiliaires. Les dispositifs auxiliaires sont facultatifs. Il est cependant possible que des réglementations nationales ou régionales rendent certains dispositifs auxiliaires obligatoires selon l'utilisation du compteur d'eau.

Vodomeri za merjenje hladne pitne vode in vroče vode - 1. del: Metrološke in tehnične zahteve (ISO 4064-1:2014)

Standard EN ISO 4064-2 določa metrološke in tehnične zahteve za vodomere za merjenje hladne pitne vode in vroče vode, ki teče skozi zaprto cev s polnim pretokom. Ti vodomeri imajo vgrajene naprave, ki prikazujejo vgrajen pretok. Poleg mehansko delujočih vodomerov se ta del standarda ISO 4064|OIML R 49 uporablja za električno ali elektronsko delujoče naprave in naprave, delujoče na podlagi mehanskih načel z vgrajenimi elektronskimi napravami, ki se uporabljajo za merjenje pretoka hladne pitne vode in vroče vode. Ta del standarda ISO 4064|OIML R 49 se uporablja tudi za elektronske pomožne naprave. Pomožne naprave so izbirne. Kljub temu lahko nacionalni ali regijski predpisi določajo obvezno uporabo nekaterih pomožnih naprav v povezavi z uporabo vodomerov.

General Information

Status
Withdrawn
Publication Date
03-Jun-2014
Withdrawal Date
23-May-2017
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
24-May-2017

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SLOVENSKI STANDARD
SIST EN ISO 4064-1:2014
01-julij-2014
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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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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
SIST EN ISO 4064-1:2014 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 4064-1:2014
---------------------- Page: 2 ----------------------
SIST EN ISO 4064-1:2014
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.
---------------------- Page: 3 ----------------------
SIST EN ISO 4064-1:2014
EN ISO 4064-1:2014 (E)
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

---------------------- Page: 4 ----------------------
SIST EN ISO 4064-1:2014
EN ISO 4064-1:2014 (E)
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.

---------------------- Page: 5 ----------------------
SIST EN ISO 4064-1:2014
EN ISO 4064-1:2014 (E)
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.
---------------------- Page: 6 ----------------------
SIST EN ISO 4064-1:2014
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
---------------------- Page: 7 ----------------------
SIST EN ISO 4064-1:2014
ISO 4064-1:2014(E)
COPYRIGHT PROTECTED DOCUMENT
© 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
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved
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SIST EN ISO 4064-1:2014
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 2014 – All rights reserved iii
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SIST EN ISO 4064-1:2014
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
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SIST EN ISO 4064-1:2014
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 2014 – All rights reserved 1
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SIST EN ISO 4064-1:2014
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
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SIST EN ISO 4064-1:2014
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 2014 – All rights reserved 3
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SIST EN ISO 4064-1:2014
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
---------------------- Page: 14 ----------------------
SIST EN ISO 4064-1:2014
ISO 4064-1:2014(E)
3.2 Metrological characteristics
3.2.1
actual volume
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
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−
volume, and is equal to: ×100%
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 2014 – All rights reserved 5
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SIST EN ISO 4064-1:2014
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 = dV/dt where V is actual volume and t is time taken for this vol
...

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