SIST ISO 4064-1:2006

INTERNATIONAL ISO
STANDARD 4064-1
Third edition
2005-10-15
Measurement of water flow in fully
charged closed conduits — Meters for
cold potable water and hot water —
Part 1:
Specifications
Mesurage de débit d'eau dans les conduites fermées en pleine
charge — Compteurs d'eau potable froide et d'eau chaude —
Partie 1: Spécifications
Reference number
©
ISO 2005
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ii © ISO 2005 – All rights reserved

Contents Page
Foreword. iv
1 Scope. 1
2 Normative references. 1
3 Terms and definitions. 2
4 Technical characteristics. 8
4.1 In-line meters. 8
4.2 Concentric meters. 10
4.3 Pressure loss. 11
5 Metrological requirements. 12
5.1 Metrological characteristics. 12
5.2 Maximum permissible error. 13
5.3 Zero flow totalization. 14
5.4 Rated operating conditions (ROC). 14
5.5 Flow profile sensitivity classes . 16
5.6 Requirements for electronic meters and meters with electronic devices . 17
6 Technical requirements. 19
6.1 Requirements for materials and construction of water meters . 19
6.2 Endurance . 19
6.3 Adjustment of water meters . 19
6.4 Verification marks and protection devices . 19
6.5 Electronic sealing devices. 19
6.6 Indicating device. 20
6.7 Water meters equipped with electronic devices . 23
6.8 Descriptive markings. 30
Annex A (informative) Concentric water meter manifold. 32
Annex B (informative) Design features and actual flowrates of water meters. 35
Annex C (normative) Checking facilities . 37
Bibliography . 41

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 4064-1 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 4064-1:1993), which has been technically
revised as well as cancelling and replacing ISO 7858-1:1998 and ISO 10385-1:2000.
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

iv © ISO 2005 – All rights reserved

INTERNATIONAL STANDARD ISO 4064-1:2005(E)

Measurement of water flow in fully charged closed conduits —
Meters for cold potable water and hot water —
Part 1:
Specifications
1 Scope
This part of ISO 4064 specifies terminology, technical characteristics, metrological characteristics and
pressure loss requirements for cold potable water and hot water meters. It applies to water meters that can
1)
withstand maximum admissible working pressures (MAP) W 1 MPa (0,6 MPa for meters for use with pipe
nominal diameters, DN W 500 mm) and a maximum admissible temperature, MAT, for cold potable water
meters of 30 ºC and for hot water meters up to 180 ºC, depending on 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 electronic devices, used to meter the actual volume flow
of cold potable water and hot water. It also applies to electronic ancillary devices. Generally ancillary devices
are optional.
The specifications of this part of ISO 4064 apply to water meters, irrespective of technology, defined as
integrating measuring instruments continuously determining the volume of water flowing through them.
NOTE National regulations may apply in the country of use. These 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 3:1973, Preferred numbers — Series of preferred numbers
ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,
tolerances and designation
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
ISO 6817 Measurement of conductive liquid flow in closed conduits — Method using electromagnetic
flowmeters
ISO 7005-2, Metallic flanges — Part 2: Cast iron flanges

1) 0,1 MPa = 1 bar
ISO 7005-3, Metallic flanges — Part 3: Copper alloy and composite flanges
OIML D 11:1994, General requirements for electronic measuring instruments
OIML V 1:2000, International vocabulary of terms in legal metrology (VIML)
OIML V 2: 1993, International vocabulary of basic and general terms in metrology (VIM)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in OIML V 2 and OIML V 1 and the
following apply.
NOTE The terms 3.27 to 3.43 are typically associated with electronic and electrical equipment.
3.1
flowrate
Q
quotient of the actual volume of water passing through the water meter and the time taken for this volume to
pass through the water meter
3.2
actual volume
V
a
total volume of water passing through the water meter, disregarding the time taken
NOTE This is the measurand of the meter.
3.3
indicated volume
V
i
volume of water indicated by the meter, corresponding to the actual volume
3.4
maximum permissible error
MPE
extreme values of the relative error of indication of the water meter permitted by this part of ISO 4064
3.5
rated operating conditions
ROC
conditions of use giving the range of values of the influence factors, for which the errors of indication of the
water meter are required to be within the MPE
3.6
limiting conditions
LC
extreme conditions, including flowrate, temperature, pressure, humidity and electromagnetic interference, EMI,
that a water meter is required to withstand without damage, and without degradation of its error of indication,
when it is subsequently operated within its ROC
NOTE 1 The above refers to both upper and lower LC.
NOTE 2 The LC for storage, transport and operation may be different.
3.7
relative error
error of indication divided by the actual volume, expressed as a percentage
2 © ISO 2005 – All rights reserved

3.8
error of indication
indicated volume minus the actual volume
3.9
permanent flowrate
Q
highest flowrate within ROC at which a water meter is required to operate in a satisfactory manner within the
maximum permissible error
3.10
overload flowrate
Q
highest flowrate at which a water meter is required to operate for a short period of time within its MPE, whilst
maintaining its metrological performance when it is subsequently operated within its ROC
3.11
minimum flowrate
Q
lowest flowrate at which the water meter is required to operate within the MPE
3.12
transitional flowrate
Q
flowrate which occurs between the permanent flowrate, Q , and minimum flowrate, Q , that divides the
3 1
flowrate range into two zones, the “upper zone” and the “lower zone”, each characterized by its own MPE
3.13
minimum admissible working temperature
mAT
minimum temperature that a water meter can withstand permanently at a given internal pressure, without
deterioration of its metrological performance
3.14
maximum admissible working temperature
MAT
maximum temperature that a water meter can withstand permanently at a given internal pressure, without
deterioration of its metrological performance
NOTE mAT and MAT are respectively the lower and upper limits of the ROC for working temperature.
3.15
minimum admissible working pressure
mAP
minimum pressure that a water meter can withstand permanently within ROC, without deterioration of its
metrological performance
3.16
maximum admissible working pressure
MAP
maximum pressure that a water meter can withstand permanently within ROC, without deterioration of its
metrological performance
NOTE mAP and MAP are respectively the lower and upper limits of the ROC for working pressure.
3.17
working temperature
T
w
average water temperature in the pipe, measured upstream and downstream of the water meter
3.18
working pressure
P
w
average water pressure in the pipe, measured upstream and downstream of the water meter
3.19
pressure loss
∆p
head loss, at a given flowrate caused by the presence of the meter in the pipeline
3.20
in-line meter
type of water meter, fitted directly into a closed conduit by means of the meter end connections (threaded or
flanged) provided
3.21
combination meter
in-line type of water meter c
...