BS EN 1434-1-2007 Heat meters - General requirements《量热计 一般要求》.pdf

1、BRITISH STANDARDBS EN 1434-1:2007Heat meters Part 1: General requirementsThe European Standard EN 1434-1:2007 has the status of a British StandardICS 17.200.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g

2、55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Wed Sep 05 07:43:23 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS EN 1434-1:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2007 BSI 2007ISBN 97

3、8 0 580 50847 9National forewordThis British Standard was published by BSI. It is the UK implementation of EN 1434-1:2007. It supersedes BS EN 1434-1:1997 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee CPI/30, Measurement of fluid flow in closed condu

4、its, 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.Complia

5、nce with a British Standard cannot confer immunity from legal obligations. Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Wed Sep 05 07:43:23 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 1434-1February 2007ICS 17.2

6、00.10 Supersedes EN 1434-1:1997 English VersionHeat meters - Part 1: General requirementsCompteurs dnergie thermique - Partie 1: PrescriptionsgnralesWrmezhler - Teil 1: Allgemeine AnforderungenThis European Standard was approved by CEN on 7 January 2007.CEN members are bound to comply with the CEN/C

7、ENELEC 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 or to an

8、y 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 versions.CEN

9、 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, Swede

10、n, 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 Members.Ref.

11、No. EN 1434-1:2007: ELicensed Copy: Wang Bin, na, Wed Sep 05 07:43:23 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-1:2007 (E) 2 Contents Page Foreword4 1 Scope 5 2 Normative references 5 3 Types of instrument.5 3.1 General5 3.2 Complete instrument.5 3.3 Combined instrument5 3.4 Hybrid instrumen

12、t (often called a “compact“ instrument) 5 3.5 Sub-assemblies of a heat meter, which is a combined instrument5 3.5.1 General5 3.5.2 Flow sensor6 3.5.3 Temperature sensor pair.6 3.5.4 Calculator .6 3.6 Equipment under test (EUT) .6 4 Terms, definitions and symbols.6 5 Rated operating conditions 9 5.1

13、Limits of temperature range .9 5.2 Limits of temperature differences9 5.3 Limits of flow-rate9 5.4 Limit of thermal power 9 5.5 Maximum admissible working pressure; PS 9 5.6 Nominal pressure; PN .10 5.7 Limits in ambient temperature .10 5.8 Limits in deviations in supply voltage.10 5.9 Maximum press

14、ure loss10 6 Technical characteristics10 6.1 Materials and construction.10 6.2 Requirements outside the limiting values of the flow rate10 6.3 Display 11 6.4 Protection against fraud .11 6.5 Supply voltage .11 6.6 Qualifying immersion depth of a temperature sensor.12 6.7 The influence on a temperatu

15、re sensor pair caused by mounting in pockets12 6.8 Reproducibility.12 6.9 Repeatability.12 6.10 Software12 7 Specified working range .13 7.1 General13 7.2 Temperature difference.13 7.3 Flow rate .13 8 Heat transmission formula .13 9 Metrological characteristics (Maximum Permissible Error, MPE)14 9.1

16、 General14 9.2 Values of maximum permissible errors 14 9.2.1 Maximum permissible relative errors of complete heat meters .14 9.2.2 Maximum permissible relative error of sub-assemblies .15 9.3 Application of maximum permissible errors 15 Licensed Copy: Wang Bin, na, Wed Sep 05 07:43:23 GMT+00:00 2007

17、, Uncontrolled Copy, (c) BSIEN 1434-1:2007 (E) 3 10 Environmental classification15 10.1 General .15 10.2 Environmental class A (Domestic use, indoor installations)15 10.3 Environmental class B (Domestic use, outdoor installations) .16 10.4 Environmental class C (Industrial installations) 16 11 Heat

18、meter specification.16 11.1 General .16 11.2 Flow sensor16 11.3 Temperature sensor pair 17 11.4 Calculator .18 11.5 Complete meters .19 12 Information to be delivered with the meter or sub-assemblies20 Annex A (normative) Heat coefficient equations.22 Annex B (normative) Flow conditioner package .24

19、 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 2004/22/EC, MID .26 Bibliography27 Licensed Copy: Wang Bin, na, Wed Sep 05 07:43:23 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-1:2007 (E) 4 Foreword This document (EN 1434-1:2007

20、) has been prepared by Technical Committee CEN/TC 176 “Heat meters”, the 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 s

21、tandards shall be withdrawn at the latest by August 2007. This document supersedes EN 1434-1:1997. The other parts are: Part 2 - Constructional requirements Part 3 - Data exchange and interfaces Part 4 - Pattern approval tests Part 5 - Initial verification tests Part 6 - Installation, commissioning,

22、 operational monitoring and maintenance According to the CEN/CENELEC Internal 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, Gr

23、eece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: Wang Bin, na, Wed Sep 05 07:43:23 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-1:2007 (

24、E) 5 1 Scope This European Standard specifies the general requirements and applies 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 indica

25、tes the quantity of heat in legal units. Electrical safety requirements are 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 followi

26、ng referenced documents are indispensable for the application 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. EN 60751, Industrial platinum resistance thermometer sensors

27、 (IEC 60751:1983 + A1:1986) EN 61010-1, Safety requirements for electrical equipment for measurement, control and laboratory use Part 1: General requirements (IEC 61010-1:2001) 3 Types of instrument 3.1 General For the purposes of this European Standard, heat meters are defined either as complete in

28、struments or as combined instruments. 3.2 Complete instrument A heat meter, which does not have separable sub-assemblies as defined in 3.5. 3.3 Combined instrument A heat meter, which has separable sub-assemblies as defined in 3.5. 3.4 Hybrid instrument (often called a “compact“ instrument) A heat m

29、eter, which for the purpose of pattern approval and verification can be treated as a combined instrument as defined in 3.3. However, after verification, its sub-assemblies shall be treated as inseparable. 3.5 Sub-assemblies of a heat meter, which is a combined instrument 3.5.1 General The flow senso

30、r, the temperature sensor pair and the calculator or a combination of these. Licensed Copy: Wang Bin, na, Wed Sep 05 07:43:23 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-1:2007 (E) 6 3.5.2 Flow sensor A sub-assembly through which the heat-conveying liquid flows, at either the flow or return of

31、 a heat-exchange circuit, and which emits a signal, which is a function of the volume or the mass or the volumetric or mass flow-rate. 3.5.3 Temperature sensor pair A sub-assembly (for mounting with or without pockets), which senses the temperatures of the heat-conveying liquid at the flow and retur

32、n of a heat-exchange circuit. 3.5.4 Calculator A sub-assembly, which receives signals from the flow sensor, and the temperature sensors and calculates and indicates the quantity of heat exchanged. 3.6 Equipment under test (EUT) A sub-assembly, a combined sub-assembly or a complete meter subject to a

33、 test. 4 Terms, definitions and symbols For the purposes of this document, the following terms, definitions and symbols apply. 4.1 response time 0,5time interval between the instant when flow or temperature difference is subjected to a specified abrupt change and the instant when the response reache

34、s 50 % of the step value 4.2 fast response meter meter suitable for heat exchanging circuits with rapid dynamic variations in the exchanged heat 4.3 rated voltage Unvoltage of the external power supply required to operate the heat meter, conventionally the voltage of the AC mains supply 4.4 rated op

35、erating conditions conditions of use, giving the range of values of influence quantities, for which the metrological characteris-tics of the instrument are within the specified maximum permissible errors 4.5 reference conditions set of specified values of influence factors, fixed to ensure valid int

36、er-comparison of results of measure-ments 4.6 influence quantity quantity, which is not the subject of the measurement, but which influences the value of the measurand or the indication of the measuring instrument 4.7 influence factors influence quantity having a value within the rated operating con

37、ditions Licensed Copy: Wang Bin, na, Wed Sep 05 07:43:23 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-1:2007 (E) 7 4.8 disturbance influence quantity having a value outside the rated operating conditions 4.9 types of error 4.9.1 error (of indication) indication of the measuring instrument minus

38、 the conventional true value of the measurand 4.9.2 intrinsic error error of a measuring instrument determined under reference conditions 4.9.3 initial intrinsic error error of a measuring instrument as determined once prior to performance tests and durability tests 4.9.4 durability error difference

39、 between the intrinsic error after a period of use and the initial intrinsic error 4.9.5 maximum permissible error; MPE extreme values of the error (positive or negative) permitted 4.10 types of fault 4.10.1 fault difference between the error of indication and the intrinsic error of the instrument 4

40、.10.2 transitory fault momentary variations in the indication, which cannot be interpreted, memorized or transmitted as measure-ments 4.10.3 significant fault fault greater than the absolute value of the MPE and not being a transitory fault NOTE If the MPE is 2 % then the significant fault is a faul

41、t larger than 2 %. 4.11 reference values of the measurand; RVM specified value of the flow-rate, the return temperature and the temperature difference, fixed to ensure valid intercomparison of the results of measurements 4.12 conventional true value value of a quantity, which for the purpose of this

42、 European Standard is considered as the true value NOTE A conventional true value is, in general, regarded as sufficiently close to the true value for the difference to be insignificant for the given purpose. Licensed Copy: Wang Bin, na, Wed Sep 05 07:43:23 GMT+00:00 2007, Uncontrolled Copy, (c) BSI

43、EN 1434-1:2007 (E) 8 4.13 meter model different sizes of heat meters or sub-assemblies having a family similarity in the principles of operation, construction and materials 4.14 electronic device device employing electronic elements and performing a specific function 4.15 electronic element smallest

44、 physical entity in an electronic device which uses electron hole conduction in semi-conductors, or electron conduction in gases or in a vacuum 4.16 qualifying immersion depth of a temperature sensor immersion depth over which the sensor is considered stable enough for the purpose of this European S

45、tandard 4.17 self heating effect increase in temperature signal that is obtained by subjecting each temperature sensor of a pair to a continuous power dissipation of 5 mW when immersed to the qualifying immersion depth in a water bath, having a mean water velocity of 0,1 m/s 4.18 meters other than f

46、or heating 4.18.1 cooling meter heat meter designed for cooling applications at low temperatures, normally covering the temperature range 2 C to 30 C and up to 20 K 4.18.1 meters for heating and cooling instrument measuring heating and cooling energy in two separate registers 4.19 flow direction is

47、described by the terms flow and return. Flow meaning the forward direction to the system and return meaning output from the system. (Flow/return means high/low temperature for a heat meter but low/high temperature for a cooling meter) 4.20 electrical pulse electrical signal (voltage, current or resi

48、stance), that departs from an initial level for a limited duration of time and ultimately returns to the original level 4.21 pulse output and input device two types of pulse devices are defined and specified: a) the pulse output device; b) the pulse input device. Both devices are functional parts of

49、 flow sensor, calculator or auxiliary devices such as remote displays or input devices of control systems Licensed Copy: Wang Bin, na, Wed Sep 05 07:43:23 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-1:2007 (E) 9 4.22 maximum admissible temperature maximum temperature of the heat conveying liquid the meter can withstand in combination with the maximum admissible working pressure and the permanent flow rate for short periods of time ( 200 h in the total life time of the unit) without a significant fault after the exposure to this maximum admissible temperature