1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58The European Standard EN 14268:2005 has the status of a British StandardICS 65.060.35Irrigation tec
2、hniques Meters for irrigation waterBRITISH STANDARDBS EN 14268:2005BS EN 14268:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 4 October 2005 BSI 4 October 2005ISBN 0 580 46703 1Cross-referencesThe British Standards which implement intern
3、ational or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purpor
4、t to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pag
5、es 2 to 17 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on this committee can be obtained on request to its secretary.enquiries on the inte
6、rpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThis British Standard is the official English language version of EN 14268:2005.The UK participation in its preparation was entr
7、usted to Technical Committee AGE/30, Irrigation and drainage equipment, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 14268August 2005ICS 65.060.35English Versio
8、nIrrigation techniques - Meters for irrigation waterTechniques dirrigation - Compteurs deau pour lirrigation Bewsserungsverfahren - Zhler fr BewsserungwasserThis European Standard was approved by CEN on 8 July 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipu
9、late the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exist
10、s in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies
11、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 STAND
12、ARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14268:2005: EEN 14268:2005 (E) 2 Contents page Foreword
13、 3 1 Scope .4 2 Normative references .4 3 Terms and definitions.5 4 Technical characteristics .7 4.1 General specifications7 4.2 Rated operating conditions7 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 ind
14、icating 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 Test
15、s and inspections 10 6.1 Tests and inspections for model approval10 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 resistance11 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
16、 Tests and inspections during production.15 6.2.1 General 15 6.2.2 Pressure resistance15 6.2.3 Initial metrology 15 7 Measurement and test apparatus 15 8 Installation conditions 16 9 Marking 16 Bibliography.17 EN 14268:2005 (E) 3 Foreword This European Standard (EN 14268:2005) has been prepared by T
17、echnical 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
18、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, G
19、reece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 14268:2005 (E) 4 1 Scope This European Standard applies to meters fitted to irrigation machines and networks. Th
20、ese 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 r
21、eferenced 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
22、 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, Indust
23、rial 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
24、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
25、: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
26、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 Pa
27、rt 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 922
28、7, Corrosion tests in artificial atmospheres Salt spray tests EN 14268:2005 (E) 5 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply1. 3.1 flow rate volume of water passing through the water meter in a unit of time 3.2 maximum permissible er
29、ror 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 performanc
30、e 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) lowe
31、st 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 per
32、manently 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 cap
33、able 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 (o
34、f 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 ind
35、irectly 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 St
36、andard. 1The terminology used also conforms to the International Vocabulary of Basic and General Terms in Metrology (v.i.m.). EN 14268:2005 (E) 6 EN ISO 6708:1995 3.11 influence quantity quantity that is not the volume of water but which affects the result of the measurements 3.12 actual volume, Va
37、total volume of water passing through the water meter, disregarding the time taken 3.13 indicated volume, Vi volume of water indicated by the meter, corresponding to the actual volume 3.14 error of indication indicated volume minus the actual volume 3.15 relative error of indication error of indicat
38、ion divided by the actual volume 3.16 resolution of indication smallest difference between indications of an indicating device that can be meaningfully distinguished NOTE For a digital device, this is the change in the indication when the least significant digit changes by one step. 3.17 intrinsic e
39、rror error (cf. indication) of a water meter determined under reference conditions 3.18 fault difference between the error (of indication) and the intrinsic error of a water meter 3.19 reference conditions set of reference values, or reference ranges of influence quantities, prescribed for testing t
40、he performance of a water meter, or for the inter-comparison of the results of measurements 3.20 maximum admissible temperature (m.a.t.) maximum water temperature that a water meter can withstand permanently, within its rated operating conditions, without deterioration of its metrological 3.21 limit
41、ing conditions extreme conditions, including, flow-rate, 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 rated operat
42、ing conditions 3.22 measurement transducer part of the meter which transforms the flow or the volume of the water to be measured into signals which are passed to the calculator. It can be based on a mechanical, an electrical or an electronic principle. It may be autonomous or use an external power s
43、ource NOTE For the purposes of this definition, the measurement transducer includes the flow or volume sensor. EN 14268:2005 (E) 7 3.23 calculator part of the meter that receives the output signals from the transducer(s) and, possibly, from associated measuring instruments, transforms them and, if a
44、ppropriate, stores in memory the results until they are used. In addition, the calculator may be capable of communicating both ways with peripheral equipment 3.24 indicating device part of the meter which displays the measurement results either continuously or on demand NOTE A printing device that p
45、rovides an indication at the end of the measurement is not an indicating device. 4 Technical characteristics 4.1 General specifications A water meter measures continuously, memorises and displays the integrated volume of water passing through the measurement transducer. NOTE A water meter includes a
46、t least a measurement transducer, a calculator and an indicating device. The manufacturer shall specify in his instruction manual the conditions in which the meter can operate in the event of reversal of the flow direction. Other ancillary functions of output and reception of information (remote rea
47、ding, prepayment etc.) may be included provided they do not affect the performance of the meters as defined in this European Standard. The meter will preferably be designed in such a way as to present as little obstacle as possible to the water flow and any solid materials it may transport. The mete
48、r shall be designed such that its operation cannot be affected by a magnetic field as defined in 6.1.3. 4.2 Rated operating conditions Rated operating conditions are given below: a) Ambient temperature (Tamb): 0,1 C Tamb 400 MPa; Module of elasticity: 12 GPa; Wetting (immersion time): 90 s; Thicknes
49、s of fibre: approximately 40 m to 50 m; Width: 0,6 mm to 0,7 mm; Length: 15 mm to 20 mm. 6.1.7.2.4 Water quality 1c Water quality 1c contains a total load of said particles less than the load of water quality 1a. 6.1.7.2.5 Quality 2 water Water containing large particles with the following characteristics: Particles: Form: spherical balls; Number of balls: 48; Density: 24 balls between 0,9 g/cm3and 1,1 g/cm3; 24 balls greater than 2 g/cm3; Size of
