EN 14268:2005

SLOVENSKI STANDARD
01-november-2005
Namakalna tehnika – Vodomeri
Irrigation techniques - Meters for irrigation water
Bewässerungsverfahren - Zähler für Bewässerungwasser
Techniques d´irrigation - Compteurs d´eau pour l´irrigation
Ta slovenski standard je istoveten z: EN 14268:2005
ICS:
65.060.35 Namakalna in drenažna Irrigation and drainage
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 14268
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2005
ICS 65.060.35
English Version
Irrigation techniques - Meters for irrigation water
Techniques d´irrigation - Compteurs d´eau pour l´irrigation Bewässerungsverfahren - Zähler für Bewässerungwasser
This European Standard was approved by CEN on 8 July 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14268:2005: E
worldwide for CEN national Members.

Contents page
Foreword .3
1 Scope .4
2 Normative references .4
3 Terms and definitions.5
4 Technical characteristics .7
4.1 General specifications.7
4.2 Rated operating conditions.7
4.3 Materials .7
4.4 Indicating device.8
4.4.1 Manufacturing .8
4.4.2 Unit of measurement .8
4.4.3 Indicating range .8
4.4.4 Colour coding for indicating devices .8
4.4.5 Readability.8
4.4.6 Verification scale.8
4.4.7 Sealing device .9
4.4.8 Interchangeability .9
4.4.9 Connection to network .9
5 Metrological requirements .9
5.1 Values of Q1, Q3 and Q4 .9
5.2 Measurement range .9
5.3 Metrological classes.9
5.4 Maximum permissible error .10
6 Tests and inspections .10
6.1 Tests and inspections for model approval.10
6.1.1 General .10
6.1.2 Number of meters to be tested .11

6.1.3 Test program .11
6.1.4 Pressure resistance.11
6.1.5 Determination of error/flow-rate curve .11
6.1.6 Head loss.12
6.1.7 Endurance tests .12
6.1.8 Perturbations tests .14
6.2 Tests and inspections during production.15
6.2.1 General .15
6.2.2 Pressure resistance.15
6.2.3 Initial metrology .15
7 Measurement and test apparatus .15
8 Installation conditions .16
9 Marking .16
Bibliography.17

Foreword
This European Standard (EN 14268:2005) has been prepared by Technical Committee CEN/TC 334
“Irrigation techniques”, the secretariat of which is held by AFNOR.
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 February 2006, and conflicting national standards shall be withdrawn
at the latest by February 2006.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and United Kingdom.
1 Scope
This European Standard applies to meters fitted to irrigation machines and networks. These meters are used
to meter the actual volume of irrigation water flowing through a fully charged, closed pipe, in order to manage
consumption, and to invoice the volume of water distributed.
Irrigation water is likely to contain mineral and organic particles.
2 Normative references
The following referenced documents are indispensable for the application of this European Standard. For
dated references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 1092-1, Flanges and their joints – Circular flangesfor pipes, valves, fittings and accessories PN designated
– Part 1: Steel flanges
EN 1092-2, Flanges and their joints – Circular flanges for pipes, valves, fittings and accessories-PN
designated – Part 2: Cast iron flanges
EN 1267, Valves – Test of flow resistance using water as test fluid
prEN 12266-3, Industrial valves – Technical conditions of delivery – Part 3 : Test procedures and acceptance
criteria
EN 14154-1, Water meters – Part 1: General requirements
EN 14154-2, Water meters – Part 2: Installation and conditions of use
EN 14154-3, Water meters – Part 3: Test methods and equipment
EN 60439-5, Low-voltage switchgear and controlgear assemblies – Part 5: Particular requirements for
assemblies intended to be installed outdoors in public places – Cable distribution cabinets (CDCs) for power
distribution in networks (IEC 60439-5:1996)
EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989)
EN 60811-4-1, Insulating and sheathing materials of electric and optical cables – Common test methods –
Part 4-1: Methods specific to polyethylene and polypropylene compounds – Resistance to environmental
stress cracking – Measurement of the melt flow index – Carbon black and/or mineral filler content
measurement in polyethylene by direct combustion – Measurement of carbon black content by
thermogravimetric analysis (TGA) – Assessment of carbon black dispersion in polyethylene using a
microscope (IEC 60811-4-1:2004)
EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads – Part 1: Dimensions,
tolerances and designation (ISO 228-1:2000)
EN ISO 4628-1, Paints and varnishes – Evaluation of degradation of coatings – Designation of quantity and
size of defects, and of intensity of uniform changes in appearance – General introduction and designation
system (ISO 4628-1:2003)
ISO 9227, Corrosion tests in artificial atmospheres – Salt spray tests
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply .
3.1
flow rate
volume of water passing through the water meter in a unit of time

3.2
maximum permissible error
extreme values of the relative error (of indication), permitted by this European Standard

3.3
overload flow-rate (Q4)
highest flow rate, at which a water meter is required to operate, for a short period of time, within its maximum
permissible error, whilst maintaining its metrological performance when it is subsequently operated within its
rated operating conditions
3.4
permanent flow-rate (Q3)
highest flow-rate within the rated operating conditions, at which the water meter is required to operate in a
satisfactory manner within the maximum permissible error

3.5
minimum flow-rate (Q1)
lowest flow-rate at which the water meter is required to operate within the maximum permissible error

3.6
minimum and Maximum Admissible working Pressure (mAP and MAP)
minimum and maximum admissible working pressures are respectively the minimum and maximum pressures
that a water meter can withstand permanently within Rated Operating Conditions, without deterioration of its
metrological performance mAP and MAP are respectively the lower and upper limits of the rated operating
conditions for working pressure

3.7
allowable operating pressure (PFA)
maximum hydrostatic pressure that a component is capable of withstanding continuously in service
[EN 805:2000]
3.8
head loss (∆∆∆∆h)
loss of energy for a given flow-rate due to the presence of the water meter in the pipeline

3.9
rated operating conditions (r.o.c.)
conditions of use giving the range of values of the influence factors for which the errors (of indication) of the
water are required to be within the maximum permissible errors

3.10
nominal diameter (DN)
alpha-numerical designation of dimension for the components of piping network used for reference purposes.
It comprises the letters DN followed by a whole number without units, which is indirectly related to the actual
dimensions, in millimetres, of the bore or the external diameter of the end connections

NOTE The number which follows the letters DN does not represent a measurable value and should not be used for
calculation purposes, except where specified in the relevant European Standard.

The terminology used also conforms to the International Vocabulary of Basic and General Terms in Metrology (v.i.m.).
...