EN 1434-5-2015 en Heat meters - Part 5 Initial verification tests《热量表 第5部分 初始验证试验》.pdf

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1、BSI Standards PublicationBS EN 1434-5:2015Heat metersPart 5: Initial verification testsBS EN 1434-5:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 1434-5:2015.It supersedes BS EN 1434-5:2007 which is withdrawn.The UK participation in its preparation was en

2、trusted to TechnicalCommittee CPI/30, Measurement of fluid flow in closed conduits.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its co

3、rrectapplication. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 84656 4ICS 17.200.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strate

4、gy Committee on 30 November 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 1434-5:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1434-5 November 2015 ICS 17.200.10 Supersedes EN 1434-5:2007English Version Heat meters - Part 5: Initial verification test

5、s Compteurs dnergie thermique - Partie 5: Essais de vrification primitive Wrmezhler - Teil 5: Ersteichung This European Standard was approved by CEN on 5 September 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

6、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 CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (En

7、glish, 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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium

8、, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerla

9、nd, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Mem

10、bers. Ref. No. EN 1434-5:2015 EBS EN 1434-5:2015EN 1434-5:2015 (E) 2 Contents Page European foreword . 3 1 Scope 5 2 Normative references 5 3 Terms and definitions . 5 4 General 5 5 Uncertainty of test equipment 6 6 Tests to be carried out . 6 6.1 General 6 6.2 Flow sensors . 6 6.3 Temperature senso

11、r pair . 7 6.3.1 Error in temperature difference 7 6.3.2 Insulation resistance . 7 6.3.3 Single temperature sensor for smart metering applications 8 6.4 Calculator . 8 6.5 Calculator and temperature sensor pair 8 6.5.1 Heating and cooling applications 8 6.5.2 Calculator with single temperature senso

12、r for smart metering applications 9 6.6 Combined heat meter 9 6.7 Complete meter . 9 7 Documentation to be supplied . 9 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 2004/22/EC, MID . 11 BS EN 1434-5:2015EN 1434-5:2015 (E) 3 Europea

13、n foreword This document (EN 1434-5:2015) has been prepared by Technical Committee CEN/TC 176 “Heat meters”, the secretariat of which is held by SIS. 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 b

14、y May 2016, and conflicting national standards shall be withdrawn at the latest by May 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent r

15、ights. This document supersedes EN 1434-5:2007. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, wh

16、ich is an integral part of this document. EN 1434, Heat meters consists of the following parts: Part 1: General requirements Part 2: Constructional requirements Part 3: Data exchange and interfaces1) Part 4: Pattern approval tests Part 5: Initial verification tests Part 6: Installation, commissionin

17、g, operational monitoring and maintenance In comparison to EN 1434-5:2007, the following changes have been made: metrological requirements for smart metering applications are added; additional functionalities for smart metering applications are added; bath constructions are added; tests for cooling

18、applications are added; single temperature sensor for smart metering are added; test for bi-functional meters for change-over between heating and cooling are added. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to impleme

19、nt this European Standard: Austria, Belgium, Bulgaria, 1) EN 1434-3 is maintained by CEN/TC 294. BS EN 1434-5:2015EN 1434-5:2015 (E) 4 Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

20、 Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 1434-5:2015EN 1434-5:2015 (E) 5 1 Scope This European Standard specifies initial verification tests for heat meters. Heat meters are ins

21、truments intended for measuring the energy which in a heat-exchange circuit is absorbed (cooling) or given up (heating) by a liquid called the heat-conveying liquid. The heat meter indicates the quantity of heat in legal units. Electrical safety requirements are not covered by this European Standard

22、. Pressure safety requirements are not covered by this European Standard. Surface mounted temperature sensors are not covered by this European Standard. This standard covers meters for closed systems only, where the differential pressure over the thermal load is limited. 2 Normative references The f

23、ollowing documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1434-1:20

24、15, Heat meters Part 1: General EN 60751, Industrial platinum resistance thermometers and platinum temperature sensors (IEC 60751) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1434-1:2015 apply. 4 General Initial verification of a measuring instrum

25、ent is a series of tests and visual examinations carried out to determine whether an instrument manufactured to replicate a given pattern conforms to that pattern and to regulations, and that its metrological characteristics lie within the limits of the maximum permissible errors. If the instrument

26、passes all tests and examinations, it is given legal character by its acceptance as evidenced by stamping and/or issuance of a certificate of verification. The provisions of this standard also apply to the re-verification of heat meters. The instrument shall be tested under rated operating condition

27、s at the extremes and midpoints of its ranges. Initial verification is divided into metrological, technical and administrative phases. In tests of a heat meter as a combined instrument, the flow sensor, the temperature sensors and the calculator shall each be tested separately. Unless otherwise stat

28、ed in the certificate of pattern approval, the verification shall be carried out in accordance with this standard. NOTE Modern heat meters are mainly equipped with CMOS microprocessors with a very low power consumption, allowing battery operation. Testing and adjusting of this type of meter needs a

29、completely different approach. Until now, almost every meter type needed its own test equipment to handle the manufacturers specific requirements. This is a very complicated and expensive way for users of several types of meters and for initial verification institutes. The more different types of he

30、at meters a user has installed, the more testing equipment he may need. An economical testing of several meters should be possible and an easy adaptation to the existing test bench is of great interest. BS EN 1434-5:2015EN 1434-5:2015 (E) 6 Since this problem came up, experts have been researching a

31、n acceptable solution to it. Details of one example of an acceptable solution are given in “Normierter Wrmezhler Adapter” (Standardised heat meter adapter) Version 1.5 of September 2000, AGFW Merkblatt 6, Band 2, Frankfurt, Germany. 5 Uncertainty of test equipment Standards, instruments and methods

32、used in verification shall suit the purpose, be traceable to more precise standards and be part of a reliable calibration programme. The uncertainties associated with these standards, methods and measuring instruments shall always be known. They shall either: a) not exceed 1/5 of the MPE (maximum pe

33、rmissible error) of the EUT (equipment under test), or, if exceeding 1/5 of the MPE, b) if the uncertainty is higher than 1/5 of MPE, the value of the difference between uncertainty and 1/5 MPE shall be subtracted from MPE, to calculate a new reduced MPE. It is recommended that option a) is used. 6

34、Tests to be carried out 6.1 General If the error determined lies outside the MPE, the test shall be repeated twice. The test is then declared satisfactory if both the arithmetic mean of the result of the three tests, and at least two of the test results are within or at the MPE. The meters shall not

35、 exploit the MPE or systematically favour any party. Each individual meter with electronic abilities for adjustments of their error curves, where the errors are aligned into the same sign () in the complete measuring range, shall only pass the verification assessment if any of the errors does not ex

36、ceed half of the MPE. Mechanical meters (e.g. Woltman Turbine Meters) with no abilities by electronic adjustments shall be produced as close as possible to zero error. For information regarding bath constructions, see EN 1434-4:2015, Annex A. For initial verification tests for temperature sensors th

37、e recommended ambient temperature is (23 2) C. 6.2 Flow sensors The verification of the flow sensor shall be carried out within each of the following flow rate ranges at a liquid temperature of (50 5) C for heating applications and (15 5) C for cooling applications. a) qi q 1,2 qi;b) 0,1 qp q 0,11 q

38、p;c) 0,9 qp q 1,1 qp.If the pattern approval certificate so provides, the verification may be carried out with cold water in accordance with the procedures laid down in the certificate. BS EN 1434-5:2015EN 1434-5:2015 (E) 7 When testing the flow sensors, the guidelines in the pattern approval certif

39、icate shall be followed (e.g. requirements for water conductivity, water temperature, straight inlet/outlet tubes). To enable rapid testing of the flow sensor, it is customary to bypass the output signal used by the calculator. However, for at least one test, this signal shall be included. Test of f

40、low sensors shall be done above minimum operation pressure specified by the manufacturer with examination of absence of cavitation. 6.3 Temperature sensor pair 6.3.1 Error in temperature difference The individual temperature sensors of the temperature sensor pair shall be tested, without their pocke

41、ts, in the same temperature bath at temperatures within each of the three temperature ranges in Table 1. Table 1 Test temperature ranges Test points Test temperature range 1min to ( )min10K + 2135K2+ 3max150 C ( )max10K to maxmax150 C ( )max20K to maxbut in any case more than 140 C NOTE If specified

42、 in the pattern approval certificate, variations in the temperature ranges and the number of temperatures are permissible. The immersion depth of the sensor under test shall be at least 90 % of the total length. The determined resistance values shall be used in a system of three equations to calcula

43、te the three constants of the temperature/resistance equation of EN 60751 and a curve shall be drawn through the three test points. Thereby the characteristic curve for the temperature sensor is known. The “ideal” curve using the standard constants of EN 60751 shall be generated. To give the error a

44、t any temperature, the “ideal” curve shall be subtracted from the characteristic curve for each temperature sensor. As a further step, the worst case error of the temperature sensor pair shall be determined over the temperature range and over the temperature difference range specified for the sensor

45、s. For outlet temperatures above 80 C, only temperature differences over 10 K shall be taken into account. The error determined as described above shall be within the limits stated in EN 1434-1:2015, 9.2.2.2. When measuring resistance, the current shall be such, that the power dissipation does not e

46、xceed 0,2 mW RMS. 6.3.2 Insulation resistance The resistance between each terminal and the sheath shall be measured with a test DC-voltage between 10 V and 100 V and under ambient conditions between 15 C and 35 C and at a relative humidity not exceeding 80 %. The polarity of the test current shall b

47、e reversed. In all cases, the resistance shall not be less than 100 M. BS EN 1434-5:2015EN 1434-5:2015 (E) 8 6.3.3 Single temperature sensor for smart metering applications The compliance with the permissible error of the temperature sensor of 0,7 K compared to the performance curve according to EN

48、60751, including the signal cables thereof, shall be tested for each temperature sensor at three typical temperature points for field applications (e.g. 10 C; 30 C; 50 C). 6.4 Calculator The calculator shall be tested, at least within each of the following temperature difference ranges: For heating

49、applications: a) min 1,2 minb) 10 K 20 K c) max- 5 K maxFor cooling applications: a) min 1,2 minb) 0,8max maxThe simulated flow rate signal shall not exceed the maximum acceptable by the calculator. The outlet temperature shall be in the temperature range between (50 5) C for heating applications and (15 5) C for cooling applications, if not otherwise stated in the pattern approval certificate. To enable rapid testing of the calculator, it