SIST EN ISO 4064-5:2025

SLOVENSKI STANDARD
01-december-2025
Vodomeri za merjenje hladne pitne vode in vroče vode - 5. del: Zahteve za
vgradnjo (ISO 4064-5:2025)
Water meters for cold potable water and hot water - Part 5: Installation requirements
(ISO 4064-5:2025)
Wasserzähler zum Messen von kaltem Trinkwasser und heißem Wasser - Teil 5:
Einbaubedingungen (ISO 4064-5:2025)
Compteurs d'eau potable froide et d'eau chaude - Partie 5: Exigences d'installation (ISO
4064-5:2025)
Ta slovenski standard je istoveten z: EN ISO 4064-5:2025
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.

EN ISO 4064-5
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2025
EUROPÄISCHE NORM
ICS 91.140.60 Supersedes EN ISO 4064-5:2017, EN ISO 4064-
5:2017/A11:2022
English Version
Water meters for cold potable water and hot water - Part
5: Installation requirements (ISO 4064-5:2025)
Compteurs d'eau potable froide et d'eau chaude - Wasserzähler zum Messen von kaltem Trinkwasser
Partie 5: Exigences d'installation (ISO 4064-5:2025) und heißem Wasser - Teil 5: Einbaubedingungen (ISO
4064-5:2025)
This European Standard was approved by CEN on 23 September 2025.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4064-5:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 4064-5:2025) 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 April 2026, and conflicting national standards shall be
withdrawn at the latest by April 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 4064-5:2017.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 4064-5:2025 has been approved by CEN as EN ISO 4064-5:2025 without any
modification.
International
Standard
ISO 4064-5
Second edition
Water meters for cold potable water
2025-09
and hot water —
Part 5:
Installation requirements
Compteurs d'eau potable froide et d'eau chaude —
Partie 5: Exigences d'installation
Reference number
ISO 4064-5:2025(en) © ISO 2025

ISO 4064-5:2025(en)
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 4064-5:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Criteria for the selection of water meters . . 2
4.1 General considerations.2
4.2 Information to be provided by the manufacturer .2
4.3 Meters operating in parallel or in a group .3
5 Associated fittings. 3
5.1 General .3
5.2 Upstream of the meter .3
5.3 Downstream of the meter.3
6 Installation . 4
6.1 General requirements .4
6.2 Installation requirements .4
6.3 Water quality (suspended particles) .5
6.4 Electromagnetic meters .5
6.5 Meters operating in parallel or in a group .5
6.6 Protection of installation .5
7 Hydraulic disturbances . 5
7.1 General considerations.5
7.2 Methods to eliminate disturbances .6
8 First operation of new or repaired water meters . 7
8.1 General considerations.7
8.2 Meters operating in parallel or in a group .7
8.3 Protection of the meter .7
8.3.1 Frost .7
8.3.2 Reverse water flow .7
8.3.3 Intentional fraud .8
8.3.4 Cartridge meters .8
8.3.5 Meters with exchangeable metrological modules .8
8.4 Safety of personnel and users .9
8.4.1 General .9
8.4.2 Manhole installation .10
8.4.3 Installation requirements for pipes greater than DN 40 .10
8.4.4 Protection against hazard related to electrical installations .10
8.5 Comfort of personnel — Access to the water meter and fittings .10
8.5.1 General considerations .10
8.5.2 Installation in manholes .10
Bibliography .12

iii
ISO 4064-5:2025(en)
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 document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by 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, in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 92, Water meters, in accordance with the Agreement on technical cooperation between
ISO and CEN (Vienna Agreement).
This second edition of ISO 4064-5 cancels and replaces the first edition (ISO 4064-5:2014), which has been
technically revised.
The main changes are as follows:
— editorial and technical changes were done throughout the document.
A list of all parts in the ISO 4064 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
International Standard ISO 4064-5:2025(en)
Water meters for cold potable water and hot water —
Part 5:
Installation requirements
1 Scope
This document applies to water meters used to meter the volume of cold potable water and hot water
flowing through a fully charged, closed conduit. These water meters incorporate devices which indicate the
integrated volume.
This document specifies criteria for the selection of single, combination and concentric water meters,
associated fittings, installation, special requirements for meters, and the first operation of new or repaired
meters to ensure accurate constant measurement and reliable reading of the meter.
In addition to meters based on mechanical principles, this document also applies to water meters based
on electrical or electronic principles, and to water meters based on mechanical principles incorporating
electronic devices, used to measure the volume of cold potable water and hot water. It also applies to
electronic ancillary devices. Ancillary devices are optional. However, national or international regulations
may make some ancillary devices mandatory in relation to the utilization of the water meter.
The recommendations of this document apply to water meters, irrespective of technology, defined as
integrating measuring instruments determining the volume of water flowing through them.
NOTE Any national regulations apply in the country of use.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements 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 4064-1OIML R 49-1, , Water meters for cold potable water and hot water — Part 1: Metrological and
technical requirements
ISO 4064-4:2024, Water meters for cold potable water and hot water — Part 4: Non-metrological requirements
not covered in ISO 4064-1
ISO 20456, Measurement of fluid flow in closed conduits — Guidance for the use of electromagnetic flowmeters
for conductive liquids
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4064-1|OIML R 49-1 and the
following apply.
[1] [2]
NOTE Many of the definitions used in this document conform to ISO/IEC Guide 99|OIML V 2-200 , OIML V 1
[3]
and OIML D 11 .
3.1
meters operating in parallel
operation of two or more meters grouped together and connected to a common source and
a common delivery
ISO 4064-5:2025(en)
3.2
multiple meter operation
operation of several meters grouped together where their inlets are connected to a common source, or their
outlets to a common delivery, but not both at the same time
3.3
adaptor
additional mechanical device fitted into a connection interface on location in order to
combine an unmodified cartridge meter of one geometry with a connection interface of another geometry
3.4
converter
connection interface consisting of several parts produced as a complete unit prior to
installation into the supply system
Note 1 to entry: No assembly work is to be done on location other than the installation of the complete interface.
Conversion is related to either change of flow pattern, change of flow direction or extension of seat depth.
4 Criteria for the selection of water meters
4.1 General considerations
The type, metrological characteristics, and sizes of water meters should be determined according to the
operating conditions of the installation and the environmental class(es) demanded, taking into account,
particularly, the following:
— the available supply pressure;
— the physical and chemical characteristics of the water, including water temperature and water quality
(suspended particles);
— the acceptable pressure loss across the meter;
— the expected flow rates: the flow rates Q and Q of the meter (as defined in ISO 4064-1:2024|OIML R 49-
1 3
1:2024, Clause 3) shall be compatible with the expected flow rate conditions of the installations, including
the water flow direction(s);
— the suitability of the meter type for the intended mechanical, climatic (this include ambient temperature
range and ambient relative humidity), electrical, and hydraulic conditions, including vibrations,
electrostatic discharges, continuous magnetic field, and electromagnetic disturbances;
— the available space and pipe work to install the meter and fittings;
— the possibility of deposition of substances from solution within the meter;
— the sustainability of the power supply of the water meter (where applicable);
— the sustained availability of the data transmission route of the water meter to the receiver (where
applicable).
When using combination meters, changeover flow rates shall be different from normal operating flow rates.
4.2 Information to be provided by the manufacturer
Sufficient information shall be provided to enable customers to choose and install a meter that conforms to
particular metrological characteristics.
The influence factors that affect the indicating error of the individual design should be stated. For each
influence factor, the relevant rated operating conditions applicable to the meter should be stated.

ISO 4064-5:2025(en)
In cases where specific installation requirements and/or special tools are required to install the meter
then sufficient information shall be provided by the manufacturer. National regulation may require
manufacturer’s instructions to be included in the purchase of a water meter to provide information relating
to the disassembly of the water meter, e.g. for the purpose of recycling or disposal of the product after it is
taken out of service.
4.3 Meters operating in parallel or in a group
4.3.1 For meters operating in parallel, means shall be provided so that the unserviceability of one or more
meters within a group shall not cause the remaining meters to operate at a flow rate in excess of the limit of
operation of each individual meter.
4.3.2 To ensure that water meters of different types operate satisfactorily in parallel, the individual
characteristic
...