SIST ISO 4064-1:2006

SLOVENSKI STANDARD
SIST ISO 4064-1:2006
01-september-2006
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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
Ta slovenski standard je istoveten z: ISO 4064-1:2005
ICS:
91.140.60 Sistemi za oskrbo z vodo Water supply systems
SIST ISO 4064-1:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 4064-1:2006

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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 4064-1:2005(E)
©
ISO 2005

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SIST ISO 4064-1:2006
ISO 4064-1:2005(E)
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ii © ISO 2005 – All rights reserved

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SIST ISO 4064-1:2006
ISO 4064-1:2005(E)
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

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SIST ISO 4064-1:2006
ISO 4064-1:2005(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 4064-1 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

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SIST ISO 4064-1:2006
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
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SIST ISO 4064-1:2006
ISO 4064-1:2005(E)
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
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SIST ISO 4064-1:2006
ISO 4064-1:2005(E)
3.8
error of indication
indicated volume minus the actual volume
3.9
permanent flowrate
Q
3
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
4
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
1
lowest flowrate at which the water meter is required to operate within the MPE
3.12
transitional flowrate
Q
2
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
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SIST ISO 4064-1:2006
ISO 4064-1:2005(E)
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 comprising one large flowrate meter, one small flowrate meter and a changeover
device that, depending on the magnitude of the flowrate passing through the meter, automatically directs the
flow through either the small or large meter or both
NOTE The meter reading is obtained from two independent totalizers or one totalizer, which adds up the values from
both water meters.
3.22
concentric meter
type of water meter fitted into a closed conduit by means of an intermediate fitting called a manifold, whereby
the inlet and outlet passages of the meter and manifold, at the interface between them, are coaxial
3.23
concentric meter manifold
pipefitting specific to the connection of a concentric meter
3.24
complete meter
meter that does not have separable measurement transducer (including flow sensor) and calculator (including
indicating device)
3.25
combined meter
meter that has separable measurement transducer (including flow sensor) and calculator (including indicating
device)
3.26
flow sensor
volume sensor
that part of the water meter (such as a disc, piston, wheel, turbine element or electromagnetic coil), which
senses the flowrate or volume of water passing through the meter
3.27
measurement transducer
part of the meter that transforms the flow or the volume of the water to be measured into signals that are
passed to the calculator
NOTE 1 It can be based on a mechanical, electrical or electronic principles. It can be autonomous or use an external
power source.
NOTE 2 For the purposes of this part of ISO 4064, the measurement transducer includes the flow or volume sensor.
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SIST ISO 4064-1:2006
ISO 4064-1:2005(E)
3.28
calculator
part of the meter that receives the output signals from the transducer(s) and, possibly, from associated
measuring instruments, transforms them into a measurement result and, if appropriate, stores the results in
memory until they are used.
NOTE In addition, the calculator can be capable of communicating both ways with ancillary devices
3.29
indicating device
part of the meter that displays the measurement results, either continuously or on demand
NOTE A printing device, which provides an indication at the end of the measurement, is not an indicating device.
3.30
primary indication
indication (displayed, printed or memorized) which is subject to legal metrological control
3.31
adjustment device
device incorporated in the meter, which only allows the error curve to be shifted generally parallel to itself, with
a view to bringing relative errors of indication within the maximum permissible errors
3.32
correction device
device connected to or incorporated in the meter for automatically correcting the volume at metering
conditions, by taking into account the flowrate and/or the characteristics of the water to be measured (e.g.
temperature and pressure) and the pre-established calibration curves
NOTE The characteristics of the water to be measured can either be measured using associated measuring
instruments, or be stored in a memory in the instrument.
3.33
ancillary device
device intended to perform a particular function, directly involved in elaborating, transmitting or displaying
measurement results.
NOTE Main ancillary devices are:
⎯ zero setting device;
⎯ price indicating device;
⎯ repeating indicating device;
⎯ printing device;
⎯ memory device;
⎯ tariff control device;
⎯ pre-setting device;
⎯ self service device.
3.34
associated measuring instruments
instruments connected to the calculator, the correction device or the conversion device, for measuring certain
quantities that are characteristic of water, with a view to making a correction and/or a conversion
3.35
electronic device
device employing electronic sub-assemblies and performing a specific function
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SIST ISO 4064-1:2006
ISO 4064-1:2005(E)
NOTE 1 Electronic devices are usually manufactured as separate units and are capable of being tested independently
NOTE 2 Electronic devices, as defined above, can be complete meters or parts of meters.
3.36
electronic sub-assembly
part of an electronic device, employing electronic components and having a recognizable function of its own
3.37
electronic component
smallest physical entity, which uses electron or hole conduction in semi-conductors, gases, or in a vacuum
3.38
checking facility
facility which is incorporated in a water meter with electronic devices and which enables significant faults to be
detected and acted upon
NOTE The checking of a transmission device aims at verifying that all the information that is transmitted (and only
that information) is fully received by the receiving equipment.
3.39
automatic checking facility
checking facility operating without the intervention of an operator
3.40
type P permanent automatic checking facility
permanent automatic checking facility operating during the entire measurement operation
3.41
type I intermittent automatic checking facility
intermittent automatic checking facility operating at certain time intervals or per fixed number of measurement
cycles
3.42
type N non-automatic checking facility
non-automatic checking facility that requires the intervention of an operator
3.43
power supply device
device, which provides the electronic devices with the required electrical energy, using one or several sources
of a.c. or d.c.
3.44
fault
difference between the error of indication and the intrinsic error of a water meter
3.45
significant fault
fault, the magnitude of which is greater than one half of the maximum permissible error in the “upper zone”
NOTE The following are not considered to be significant faults:
⎯ faults arising from simultaneous and mutually independent causes in the water meter itself or in its checking facilities;
⎯ transitory faults being momentary variations in the indication, which cannot be interpreted, memorized, or transmitted
as a measurement result.
3.46
influence quantity
quantity that is not the measurand but that affects the result of measurement
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SIST ISO 4064-1:2006
ISO 4064-1:2005(E)
3.47
reference conditions
set of reference values, or reference ranges, of influence quantities, prescribed for testing the performance of
a water meter, or for the inter-comparison of the results of measurements
3.48
intrinsic error
error of indication of a water meter determined under reference conditions
3.49
initial intrinsic error
intrinsic error of a water meter as determined prior to all performances tests
3.50
influence factor
influence quantity having a value within the ROC of the water meter, as specified in this part of ISO 4064
3.51
disturbance
influence quantity having a value within the limits specified in this part of ISO 4064, but outside the specified
ROC of the water meter
NOTE An influence quantity is a disturbance if, for that influence quantity, the ROC are not specified.
3.52
first element of the indicating device
element that, in an indicating device comprising several elements, carries the graduated scale with the
verification scale interval
3.53
verification scale interval
lowest value scale division of the first element of the indicating device
3.54
equipment under test
EUT
complete water meter, sub-assembly of a water meter or ancillary device
3.53
sub-assembly
measurement transducer, (including flow sensor) and the indicating device (including calculator) of a
combined meter
3.55
test flowrate
mean flowrate during a test, calculated from the indications of a calibrated reference device, equal to the
quotient of the actual volume passing through the water meter divided by the time for that volume to pass
through the water meter
3.56
nominal diameter
alphanumeric designation of size for components of a pipework system, which is used for reference purposes
NOTE It comprises the letters DN followed by a dimensionless whole number that is indirectly related to the physical
size in mm of the bore, or outside diameter of the end connections.
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SIST ISO 4064-1:2006
ISO 4064-1:2005(E)
3.57
conversion device
device that automatically converts the volume measured at metering conditions into a volume at base
conditions, or into a mass, by taking account of the characteristics of the liquid (temperature, pressure, density,
relative density) measured using associated measuring instruments, or stored in a memory by an automatic
checking facility operating at certain time intervals or per fixed number of measurement cycles
4 Technical characteristics
4.1 In-line meters
4.1.1 Meter size and overall dimensions
Meter size is characterized either by the thread size of the end connections or by the nominal size of the
flange. For each meter size there is a corresponding fixed set of overall dimensions. The dimensions of the
meter, as illustrated in Figure 1, shall be in accordance with those listed in Table 1.

Key
1 pipe axis
NOTE H , H L, W and W define the height, length and width respectively of a cuboid within which the water meter
,
1 2 1 2
can be contained (the cover being at right angles to its closed position). H , H W and W are maximum dimensions. L is
,
1 2 1 2
a fixed value with specified tolerances.
Figure 1 — Meter size and overall dimensions

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SIST ISO 4064-1:2006
ISO 4064-1:2005(E)
Table 1 — Water meter dimensions
Dimensions in millimetres

b b
Size
L L
a b W ;W H H
min min 1 2 1 2
a
DN
(preferred) (alternatives)
80, 85, 100, 105, 110, 114, 115, 130,
15 10 12 165 134, 135, 145, 170, 175, 180, 190, 200, 65 60 220
220
105, 110, 115, 130, 134, 135, 165, 175,
20 12 14 190 65 60 240
195, 200, 220, 229
25 12 16 260 110, 150, 175, 200, 210, 225, 273 100 65 260
32 13 18 260 110, 150, 175, 200, 230, 270, 300, 321 110 70 280
40 13 20 300 200, 220, 245, 260, 270, 387 120 75 300
170, 245, 250, 254, 270, 275, 300, 345,
50  200 135 216 390
350
65  200 170, 270, 300, 450 150 130 390
80  200 190, 225,300, 305,350, 425, 500 180 343 410
100  250 210, 280, 350, 356, 360, 375, 450, 650 225 356 440
125  250 220, 275, 300, 350, 375, 450 135 140 440
150  300 230, 325, 350, 450, 457,500, 560 267 394 500
200  350 260, 400, 500, 508, 550, 600, 620 349 406 500
250  450 330, 400, 600, 660, 800 368 521 500
300  500 380, 400, 800 394 533 533
350  500 420, 800 270 300 500
400  600 500, 550, 800 290 320 500
500  600 500, 625, 680, 770, 800, 900, 1 000 365 380 520
600  800 500, 750, 820, 920, 1 000, 1 200 390 450 600
800  1 200 600 510 550 700
> 800  1,25 × DN DN 0,65 × DN 0,65×DN 0,75 × DN
a
DN: nominal size of flanges and threaded connections
b
Tolerance on length: DN 15 to DN 40 – 0/−2 mm;
 DN 50 to DN 300 – 0/−3 mm;
 DN 350 to DN 400 – 0/−5 mm.
Tolerances on lengths of meters greater than DN 400 shall be agreed upon between the user and manufacturer.

4.1.2 Threaded connection
Permissible values of dimensions a and b for threaded connections are given in Table 1. Threads shall comply
with ISO 228-1. Figure 2 defines dimensions a and b.
4.1.3 Flanged connection
Flanged end connections shall comply with ISO 7005-2 and ISO 7005-3 for the maximum pressure
corresponding to that of the water meter. Dimensions shall be as given in Table 1.
The manufacturer shall provide a reasonable clearance behind the rear face of the flange to allow access for
installation and removal.
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SIST ISO 4064-1:2006
ISO 4064-1:2005(E)

Figure 2 — Threaded connection
4.1.4 Combination meter connection
Dimensions shall be as listed in Table 2.
The overall length of a combination meter may be a fixed dimension or may be adjustable by means of a
sliding coupling. In this case, the minimum possible adjustment of the meter overall length shall be ± 15 mm
relative to the nominal value of L defined in Table 2.
Because of the wide variation in the height of the various types of combination meters, it has not been
possible to standardize these dimensions.
Table 2 — Combination water meter with flanged end connections
Dimensions in millimetres
L L
a
W ;W
Size DN
1 2
(preferred) (alternatives)
50 300 270, 432, 560, 600 220
65 300 650 240
80 350 300, 432, 630, 700 260
100 350 360, 610, 750, 800 350
125 350 850 350
150 500 610, 1 000 400
200 500 1 160, 1 200 400
a
DN: nominal sizes of flange connection.
4.2 Concentric meters
4.2.1 General
This section contains the necessary information on meter size and overall dimensions. The design of two (2)
meter manifold connections is found in Annex A. This section and Annex A may be subject to change as
concentric water meter and manifold designs evolve.
4.2.2 Meter size and overall dimensions
Dimensions for a current meter design are shown in Figure 3 and Table 3.
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SIST ISO 4064-1:2006
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4.2.3 Design of the meter manifold connection
The meter connection shall be designed to connect the meter, using the screw thread provided, to a manifold
having this design of face. Suitable seals shall ensure that no leaks occur between the inlet connection and
the meter/manifold exterior or between the inlet and outlet passages at the meter/manifold interface.
4.2.4 Dimensions of concentric meters
Dimensions for concentric meters are defined by a cylinder into which the meter fits (see Figure 3 an
...