1、BRITISH STANDARDBS EN 1434-5:2007Heat meters Part 5: Initial verification testsThe European Standard EN 1434-5:2007 has the status of a British StandardICS 17.200.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g
2、48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Wed Sep 05 07:56:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS EN 1434-5:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2007 BSI 2007I
3、SBN 978 0 580 50850 9National forewordThis British Standard was published by BSI. It is the UK implementation of EN 1434-5:2007. It supersedes BS EN 1434-5:1997 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee CPI/30, Measurement of fluid flow in closed
4、 conduits, to Subcommittee CPI/30/7, Volume flow-rate methods.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.C
5、ompliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Wed Sep 05 07:56:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 1434-5February 2007ICS
6、 17.200.10 Supersedes EN 1434-5:1997 English VersionHeat meters - Part 5: Initial verification testsCompteurs dnergie thermique - Partie 5: Essais devrification initiauxWrmezhler - Teil 5: ErsteichungThis European Standard was approved by CEN on 7 January 2007.CEN members are bound to comply with th
7、e CEN/CENELEC Internal Regulations which stipulate 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 CEN Management Centre o
8、r to any CEN member.This European Standard exists 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 CEN Management Centre has the same status as theofficial versi
9、ons.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain
10、, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Member
11、s.Ref. No. EN 1434-5:2007: ELicensed Copy: Wang Bin, na, Wed Sep 05 07:56:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-5:2007 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 General4 4 Uncertainty of test equipment5 5 Tests to be carried out 5 5.1 General5 5.2 Flow sensors
12、5 5.3 Temperature sensor pair.6 5.3.1 Error in temperature difference6 5.3.2 Insulation resistance .6 5.4 Calculator .7 5.5 Calculator and temperature sensor pair. 7 5.6 Combined heat meter 7 5.7 Complete meter8 6 Documentation to be supplied .8 Annex ZA (informative) Relationship between this Europ
13、ean Standard and the Essential Requirements of EU Directive 2004/22/EC, MID 9 Licensed Copy: Wang Bin, na, Wed Sep 05 07:56:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-5:2007 (E) 3 Foreword This document (EN 1434-5:2007) has been prepared by Technical Committee CEN/TC 176 “Heat meters”, the
14、 secretariat of which is held by DS. 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 August 2007, and conflicting national standards shall be withdrawn at the latest by August 2007. This document
15、supersedes EN 1434-5:1997. The other parts are: Part 1 - General requirements Part 2 - Constructional requirements Part 3 - Data exchange and interfaces Part 4 - Pattern approval tests Part 6 - Installation, commissioning, operational monitoring and maintenance According to the CEN/CENELEC Internal
16、Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
17、Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: Wang Bin, na, Wed Sep 05 07:56:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-5:2007 (E) 4 1 Scope This European Standard specifies initial verification tests and a
18、pplies to heat meters, that is to instruments intended for measuring the heat 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
19、not covered by this European Standard. Pressure safety requirements are not covered by this European Standard. Surface mounted temperature sensors are not covered by this European Standard. 2 Normative references The following referenced documents are indispensable for the application of this docume
20、nt. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1434-1:2007, Heat meters Part 1: General requirements EN 60751:1995, Industrial platinum resistance thermometer sensors (IEC 60751:19
21、83 + A1:1986) 3 General Initial verification of a measuring instrument 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 with
22、in the limits of the maximum permissible errors. If the instrument 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 met
23、ers. The instrument shall be tested under rated operating conditions 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 th
24、e calculator shall each be tested separately. Unless otherwise stated 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 batt
25、ery operation. Testing and adjusting of this type of meter needs a 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
26、for initial verification institutes. The more different types of heat 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. Since this problem came up, ex
27、perts have been researching an 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. Licensed Copy: Wang Bin, na, Wed Sep 0
28、5 07:56:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-5:2007 (E) 5 4 Uncertainty of test equipment Standards, instruments and methods used in verification shall suit the purpose, be traceable to more precise standards and be part of a reliable calibration programme. The uncertainties associat
29、ed with these standards, methods and measuring instruments shall always be known. They shall either: a) not exceed 1/5 of the MPE (maximum permissible error) of the EUT (equipment under test), or, if exceeding 1/5, b) be subtracted from the MPE of the EUT to obtain a new MPE. It is recommended that
30、option a) is used. 5 Tests to be carried out 5.1 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 M
31、PE. 5.2 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 1,1 qib) 0,1 qp q 0,11 qpc) 0,9 qp q 1,0 qpIf the pattern approval ce
32、rtificate so provides, the verification may be carried out with cold water in accordance with the procedures laid down in the certificate. When testing the flow sensors, the guidelines in the pattern approval certificate shall be followed (e.g. requirements for water conductivity, water temperature,
33、 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. Licensed Copy: Wang Bin, na, Wed Sep 05 07:56:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN
34、1434-5:2007 (E) 6 5.3 Temperature sensor pair 5.3.1 Error in temperature difference The individual temperature sensors of the temperature sensor pair shall be tested, without their pockets, in the same temperature bath at temperatures within each of the three temperature ranges in Table 1. Table 1 T
35、est temperature ranges No. For minTest temperature range Heating Cooling 1 20 C minto min+ 10 K 0 C to 10 C 20 C 35 C to 45 C 2 All min75 C to 85 C 35 C to 45 C 3 All minmax- 30 K to max75 C to 85 C NOTE If specified in the pattern approval certificate, variations in the temperature ranges and the n
36、umber 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 calculate the three constants of the temperature/resistance equation of EN 60751 and a curv
37、e 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 at any temperature, the “ideal“ curve shall be subtracted from the characteristic cur
38、ve 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 sensors. For return temperatures above 80 C, only temperature differences over 10 K shall
39、be taken into account. The error determined as described above shall be within the limits stated in 9.2.2.2 of EN 1434-1:2007. When measuring resistance, the current shall be such, that the power dissipation does not exceed 0,2 mW RMS. 5.3.2 Insulation resistance The resistance between each terminal
40、 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 be reversed. In all cases the resistance shall not be less than 100 M. Licensed Cop
41、y: Wang Bin, na, Wed Sep 05 07:56:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-5:2007 (E) 7 5.4 Calculator The calculator shall be tested, at least within each of the following temperature difference ranges: For heating applications: a) min 1,2 minb) 10 K 20 K c) max- 5 K maxFor cooling appl
42、ications: a) min 1,2 minb) 0,8 max max but 15 K The simulated flow rate signal shall not exceed the maximum acceptable by the calculator. The return temperature shall be in the temperature range between 40 C and 70 C for heating applications and (20 5) C for cooling applications, if not otherwise st
43、ated in the pattern approval certificate. To enable rapid testing of the calculator, it is customary to by-pass the indicating device of the heat meter. However, for at least one test, the meters indicating device shall be included. 5.5 Calculator and temperature sensor pair. The sub-assembly of cal
44、culator and temperature sensor pair shall be tested using temperature ranges of 5.3 and the temperature difference ranges of 5.4. Additionally, a final test of the sub-assembly is necessary, with the temperature sensor pair immersed in two temperature regulated baths. The temperature difference of t
45、he baths shall be between 3 K and 4 K. The simulated flow-rate shall not create a signal exceeding the maximum signal acceptable by the calculator. If the calculator and temperature sensor pair are tested as an inseparable sub-assembly, it shall be tested in accordance with 5.4. 5.6 Combined heat me
46、ter The flow sensor, the temperature sensor pair and the calculator shall be each tested separately, in accordance with 5.2 to 5.4. Licensed Copy: Wang Bin, na, Wed Sep 05 07:56:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-5:2007 (E) 8 5.7 Complete meter The verification of the complete mete
47、r shall be carried out, at least within each of the following ranges For heating applications: a) min 1,2 minand 0,9 qp q qpb) 10 K 20 K and 0,1 qp q 0,11 qpc) max- 5 K maxand qi q 1,1 qiFor cooling applications: a) min 1,2 minand 0,9 qp q qpb) max- 5 K maxand qi q 1,1 qi The return temperature shal
48、l be in the temperature range between 40 C and 70 C for heating applications and (20 5) C for cooling applications, if not otherwise stated in the pattern approval certificate. To enable rapid testing of the complete meter, it is customary to bypass the indicating device of the heat meter. However,
49、for at least one test, the meters indicating device shall be included. 6 Documentation to be supplied The supplier shall make available data sheets with at least the following information: - heat meter specification; - sensor specification; - type and specification of the battery; - assembly instruction; - installation instruction; - security sealing plan; - initial functional check and o
