ISO 16399:2023
(Main)Agricultural irrigation equipment — Meters for irrigation water
Agricultural irrigation equipment — Meters for irrigation water
This document specifies the requirements and certification procedures for water meters, irrespective of the design technologies used to meter the actual volume of cold water or heated water flowing through a fully charged closed conduit. These water meters incorporate devices, which indicate the integrated volume. It applies to water meters intended for irrigation use (herein after referred to as water meters), regardless of the water quality used for this purpose. 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 meter the actual volume flow of cold water. It provides metrological requirements for electronic ancillary devices when they are subject to metrological control. NOTE Clean water meters are different from irrigation water meters. This document is based on clean water meters standards but, it is important to develop a specific standard for irrigation water meters indicating their specific requirements.
Matériel d'irrigation agricole — Compteurs pour l'eau d'irrigation
General Information
Relations
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 16399
Second edition
2023-02
Agricultural irrigation equipment —
Meters for irrigation water
Matériel d'irrigation agricole — Compteurs pour l'eau d'irrigation
Reference number
ISO 16399:2023(E)
© ISO 2023
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ISO 16399:2023(E)
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© ISO 2023
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ISO 16399:2023(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Metrological requirements . .5
4.1 Values of Q , Q , Q and Q . 5
1 2 3 4
4.1.1 Permanent flow rate (Q ) . 5
3
4.1.2 Measuring range . 6
4.1.3 Relationship between permanent flow rate (Q ) and overload flow rate (Q ) . 6
3 4
4.1.4 The ratio Q /Q shall be 1,6 . 6
2 1
4.2 Maximum permissible error (MPE) . 6
4.2.1 Formulation . 6
4.2.2 Accuracy class . 7
4.2.3 Meter temperature classes . 7
4.2.4 Reverse flow . 7
4.2.5 Absence of flow or of water . 8
4.2.6 Static pressure . 8
4.3 Requirements for meters and ancillary devices . 8
5 Water meters equipped with electronic devices . 8
6 Technical characteristics .8
6.1 Materials and construction of water meters . 8
6.2 Adjustment and correction . . 9
6.3 Installation conditions . 9
6.4 Rated operating conditions . 9
6.5 Pressure loss . 10
6.6 Marks and inscriptions . 10
6.7 Indicating device . . 11
6.7.1 General requirements . 11
6.7.2 Types of indicating device .12
6.8 Sealing and security .13
6.8.1 Meter security and protection against manipulations .13
6.8.2 Mechanical protection devices . 13
6.8.3 Electronic sealing devices . 13
6.9 Other devices .13
7 Performance tests .13
7.1 General conditions for the tests . 13
7.1.1 Water quality .13
7.1.2 Reference conditions . 14
7.1.3 General rules concerning test installation and location . 14
7.2 Static pressure test . 14
7.2.1 General . 14
7.2.2 Preparation . 14
7.2.3 Test procedure.15
7.2.4 Acceptance criteria . 15
7.3 Determination of errors . 15
7.3.1 General .15
7.3.2 Preparation .15
7.3.3 Test procedure. 21
7.3.4 Acceptance criteria . 21
7.4 Pressure loss test . 21
7.4.1 General . 21
7.4.2 Preparation . 21
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ISO 16399:2023(E)
7.4.3 Test procedure.22
7.4.4 Calculation of the actual Δp of a water meter. 24
7.4.5 Acceptance criteria . 24
7.5 Reverse flow test . 24
7.5.1 General . 24
7.5.2 Preparation . 24
7.5.3 Test procedure. 24
7.5.4 Acceptance criteria . 25
7.6 Flow disturbance tests . 25
7.6.1 General . 25
7.6.2 Objective of the test .26
7.6.3 Preparation . 26
7.6.4 Test procedure.26
7.6.5 Acceptance criteria . 26
7.7 Endurance tests .28
7.7.1 Durability test .28
7.7.2 Resistance to solid particles test . 33
7.8 Magnetic field testing . 35
7.9 Test on ancillary devices of a water meter . 35
8 Tests related to the influence quantities and perturbations .35
Annex A (informative) Pulse input solutions .36
Annex B (normative) Flow disturbers .42
Bibliography .56
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ISO 16399:2023(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 (see 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 (see 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.
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 23, Tractors and machinery for agriculture
and forestry, Subcommittee SC 18, Irrigation and drainage equipment and systems.
This second edition cancels and replaces the first edition (ISO 16399:2014), which has been technically
revised.
The main changes are as follows:
— the range of pressure regulators sizes has been extended up to DN 100 (4");
— the water temperature of the irrigation system has been harmonized to 60 °C;
— the normative references have been updated;
— the terms and definitions have been updated;
— the testing water temperature range has been updated to 4 °C to 35 °C;
— the face-to-face distance of the flanged bodies of the pressure regulators has been updated to ±4 mm
for plastics-body regulators.
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.
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INTERNATIONAL STANDARD ISO 16399:2023(E)
Agricultural irrigation equipment — Meters for irrigation
water
1 Scope
This document specifies the requirements and certification procedures for water meters, irrespective
of the design technologies used to meter the actual volume of cold water or heated water flowing
through a fully charged closed conduit. These water meters incorporate devices, which indicate the
integrated volume. It applies to water meters intended for irrigation use (herein after referred to as
water meters), regardless of the water quality used for this purpose.
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 meter the actual
volume flow of cold water. It provides metrological requirements for electronic ancillary devices when
they are subject to metrological control.
NOTE Clean water meters are different from irrigation water meters. This document is based on clean water
meters standards but, it is important to develop a specific standard for irrigation water meters indicating their
specific requirements.
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 4064-1:2014, Water meters for cold potable water and hot water — Part 1: Metrological and technical
requirements
ISO 4064-2:2014, Water meters for cold potable water and hot water — Part 2: Test methods
ISO 9644, Agricultural irrigation equipment — Pressure losses in irrigation valves — Test method
ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in
me a s ur ement (GUM: 1995)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
actual volume
total volume of water passing through the meter, disregarding the time taken
Note 1 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.
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ISO 16399:2023(E)
3.2
adjustment device
part of the meter that allows adjustment of the indicated values such that the error curve of the meter is
generally shifted parallel to itself to find in the envelope of maximum permissible errors (3.17)
3.3
ancillary device
device intended to perform a specific function, directly involved in elaborating, transmitting or
displaying measured values
Note 1 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).
3.4
bounce
momentary re-opening of a contact after initial closing, or a momentary closing after initial opening
3.5
bounce time
interval of time between the instant of the first closing (or opening) and the instant of the final closing
(or opening) of the reed contact unit (3.28)
3.6
calculator
part of the meter that transforms the output signals from the measurement transducer(s) and, possibly,
form 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.
3.7
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 (3.10) and/or the characteristics of the water
to be measured and the pre-established calibration curves
3.8
durability
ability of a meter to maintain its performance characteristics over a period of use
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ISO 16399:2023(E)
3.9
error
measured quantity value minus a reference quantity value
V −V
i a
×100(%)
V
a
3.10
flow rate
volume of water flowing through the meter per unit time
3.11
indicating device
part of the meter that provides an indication corresponding to the volume of water passing through the
meter
3.12
indicated volume
volume of water indicated by the meter, corresponding to the actual volume (3.1)
3.13
influence factor
influence variable (3.14) having a value within the rated operating conditions (3.27) specified for a water
meter (3.32)
3.14
influence variable
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
3.15
maximum admissible pressure
maximum internal pressure that the meter can withstand permanently, within its rated operating
conditions (3.27), without deterioration of its metrological performance
Note 1 to entry: MAP is equivalent to nominal pressure (PN).
3.16
maximum admissible temperature
MAT
maximum water temperatures that a meter can withstand permanently, within its rated operating
conditions (3.27), without deterioration of its metrological performance
3.17
maximum permissible error
MPE
extreme value of error, with respect to a known reference quantity value, permitted by the specifications
given in this document
3.18
measurement transducer
part of the meter that transforms the flow rate (3.10) or volume of water to be measured into signals
which are passed to the calculator (3.6) and includes the sensor (3.29)
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.
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ISO 16399:2023(E)
3.19
metering conditions
conditions of the water, the volume of which is to be measured, at the point of measurement
EXAMPLE Water temperature, water pressure.
3.20
minimum admissible temperature
mAT
minimum water temperatures that a meter can withstand permanently, within its rated operating
conditions (3.27), without deterioration of its metrological performance
3.21
minimum flow rate
Q
1
lowest flow rate (3.10) at which the meter is designed to operate within the maximum permissible error
(3.17)
3.22
nominal diameter
alphanumeric designation of the size of pipe work components, used for reference purposes, comprising
the letters DN followed by a dimensionless round number which is loosely related to the effective
dimensions, in millimetres, of the bore or external diameter of the end connections
3.23
operate position time
interval of time between the instant the reed contact unit (3.28) is in the operate position and the
instant of the removal of the applied magnetic field to the contact
Note 1 to entry: It includes the closing bounce time (3.5) in a normally open contact or the opening bounce time in
a normally closed contact.
3.24
overload flow rate
Q
4
highest flow rate (3.10) at which the water meter (3.32) is designed to operate for a short period of time
within its maximum permissible error (3.17), while maintaining its metrological performance when it is
subsequently operating within the rated operating conditions (3.27)
3.25
permanent flow rate
Q
3
highest flow rate (3.10) within the rated operating conditions (3.27) at which the meter is designed to
operate within the maximum permissible errors (3.17)
3.26
pressure loss
difference in pressure due to water flow between two specified points in a system or in part of a system
3.27
rated operating condition
operating conditions requiring fulfilment during measurement in order that a meter performs as
designed
[SOURCE: VIM: 2012, 4.9]
3.28
reed contact unit
assembly containing contact blades, some or all of magnetic material, hermetically sealed in an envelope
and controlled by means of externally generated magnetic field (e.g. a pulse generator)
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ISO 16399:2023(E)
3.29
sensor
element of a meter that is directly affected by a phenomenon, body or substance carrying a quantity to
be measured
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 an is referred to as a “flow sensor” or “volume sensor”.
3.30
test flow rate
mean flow rate (3.10) during a test, calculated from the indications of a calibrated reference device
3.31
transitional flow rate
Q
2
flow rate (3.10) between the permanent flow rate (3.25) and the minimum flow rate (3.21) that divides
the flow rate range into two zones, the upper zone and the lower zone, each characterized by its own
maximum permissible error (3.17)
3.32
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: When a device claiming to be a water meter has the intended use of documenting water flow for
payment purposes, then that device must include, at least, a measurement transducer, a calculator (including
adjustment or correction devices, if present) and an indicating device. These three devices may be in different
housings. Water meters not intended for payment purposes only need to be compatible, in some way, with all the
aforementioned three devices.
[SOURCE: OIML R49 -1: 2006]
3.33
working pressure
average water pressure in the pipe measured upstream and downstream of the meter
3.34
working temperature
T
w
water temperature in the pipe measured upstream of a water meter (3.32)
[SOURCE: OIML R49 -1: 2006]
4 Metrological requirements
4.1 Values of Q , Q , Q and Q
1 2 3 4
4.1.1 Permanent flow rate (Q )
3
3
The value of Q , in (m /h), shall be chosen from the following list:
3
1,0 1,6 2,5 4,0 6,3
10 16 25 40 63
100 160 250 400 630
1 000 1 600 2 500 4 000 6 300
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ISO 16399:2023(E)
This list may be extended to higher or lower values in the series.
4.1.2 Measuring range
The measuring range for the flow rate is defined by the ratio (R) Q /Q . The values shall be chosen from
3 1
the following list:
10 12,5 16 20 25 31,5 40 50 63 80
100 125 160 200 250 315 400 500 630 800
This list may be extended to higher values in the series.
4.1.3 Relationship between permanent flow rate (Q) and overload flow rate (Q )
3 4
The overload flow rate is defined by Formula (1):
Q /Q = 1,25 (1)
4 3
4.1.4 The ratio Q /Q shall be 1,6
2 1
The transitional flow rate is defined by Formula (2):
Q /Q = 1,6 (2)
2 1
e.g.: Q = 100; Q /Q = 10 (R10); Q /Q = 1,6; Q /Q = 1,25
3 3 1 2 1 4 3
where
3
Q 100 m /h;
3
3
Q 10 m /h;
1
3
Q 16 m /h;
2
3
Q 125 m /h.
4
4.2 Maximum permissible error (MPE)
4.2.1 Formulation
The error is expressed as a percentage, and is calculated using F
...
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