1、BRITISH STANDARDBS EN 1434-2:2007Incorporating corrigendum no. 1Heat meters Part 2: Constructional requirementsThe European Standard EN 1434-2:2007 has the status of a British StandardICS 17.200.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59
2、g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 1434-2:2007This British Sta
3、ndard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2007 BSI 2008ISBN 978 0 580 60652 6National forewordThis British Standard is the UK implementation of EN 1434-2:2007. It supersedes BS EN 1434-2:1997 which is withdrawn. The start and finish of text intr
4、oduced or altered by corrigendum is indicated in the text by tags . Text altered by CEN corrigendum October 2007 is indicated in the text by .The UK participation in its preparation was entrusted by Technical Committee CPI/30, Measurement of fluid flow in closed conduits, to Subcommittee CPI/30/7, V
5、olume flow-rate methods.A list of organizations represented on this subcommittee 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.Compliance with a British Standard c
6、annot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date Comments17486 Corrigendum No. 131 January 2008 See national forewordCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitt
7、ed without license from IHS-,-,-EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 1434-2February 2007ICS 17.200.10 Supersedes EN 1434-2:1997 English VersionHeat meters - Part 2: Constructional requirementsCompteurs dnergie thermique - Partie 2: Prescriptions defabricationWrmezhler - Teil 2: Anforder
8、ungen an die KonstruktionThis European Standard was approved by CEN on 7 January 2007.CEN members are bound to comply with the 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 a
9、nd bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or 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 responsibi
10、lity of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, I
11、reland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart,
12、36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1434-2:2007: EIncorporating corrigendum October 2007 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo repr
13、oduction or networking permitted without license from IHS-,-,-EN 1434-2:2007 (E) 2 Contents Page Foreword4 1 Scope 5 2 Normative references 5 3 Temperature sensors 5 3.1 General5 3.2 Mechanical design.6 3.2.1 General6 3.2.2 Materials of temperature probe sheath and pocket .6 3.2.3 Dimensions of dire
14、ct mounted short probes - Type DS 6 3.2.4 Dimensions of direct mounted long probes - Type DL6 3.2.5 Dimensions of pocket mounted long probes - Type PL 9 3.2.6 Dimensions of temperature pocket9 3.2.7 Design of short probes with respect to installation.11 3.2.8 Design of long probes with respect to in
15、stallation 11 3.3 Platinum temperature sensor .12 3.3.1 Specialised definitions for 2 wire temperature probes12 3.3.2 Resistance characteristics .13 3.3.3 Signal leads 14 3.3.4 Temperature sensors for the 2-wire method 14 3.3.5 Temperature sensors for the 4-wire method 14 3.3.6 Thermal response time
16、 .15 3.4 Other temperature sensors.15 4 Flow sensors15 4.1 Maximum admissible working pressure, PS in bar15 4.2 Sizes and dimensions .15 4.3 Test signal output17 4.4 Adjusting device 17 5 Calculators .17 5.1 Mechanical dimensions for calculators for domestic use.17 5.2 Terminals - specification and
17、identification18 5.2.1 General18 5.2.2 Terminals for signal leads 18 5.2.3 Terminals for connection to the mains supply.19 5.3 Batteries20 5.4 Dynamic behaviour20 5.5 Test signal output20 5.6 24 h interruption in supply voltage20 6 Complete meter20 7 Interfaces between sub-assemblies 20 7.1 Definiti
18、ons for pulse device interfaces21 7.1.1 General21 7.1.2 Electrical connection.21 7.1.3 Classification of pulse output devices 21 7.1.4 Timing and electrical parameters for pulse output devices (other than test signals)22 7.1.5 Classification of pulse input devices 22 7.1.6 Timing and electrical para
19、meter for pulse input devices 23 7.1.7 Compatibility 23 8 Marking and security seals.24 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 1434-2:2007 (E) 3 8.1 Marking.24 8.1.1
20、General .24 8.1.2 Temperature sensor pairs 24 8.1.3 Pockets.24 8.1.4 Flow sensor24 8.1.5 Calculator .25 8.1.6 Complete meter .25 8.2 Sites for marking .26 8.3 Security seals 26 Annex A (informative) Examples of temperature sensors27 Annex B (normative) Input and output test signals 36 Annex C (infor
21、mative) Low voltage Power Supply for heat meters and their sub-assemblies 39 C.1 Remote supply.39 C.1.1 Voltage (DC or AC) 39 C.1.2 Current available .39 C.1.3 Cabling requirements39 C.2 Local external DC supply39 C.2.1 Voltage39 C.2.2 Other data.40 C.3 Power supply specifications 40 Annex ZA (infor
22、mative) Relationship between this European Standard and the Essential Requirements of EU Directive 2004/22/EC, MID 41 Bibliography42 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,
23、-,-EN 1434-2:2007 (E) 4 Foreword This document (EN 1434-2:2007) 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 endorse
24、ment, at the latest by August 2007, and conflicting national standards shall be withdrawn at the latest by August 2007. This document supersedes EN 1434-2:1997. The other parts are Part 1 - General requirements Part 3 - Data exchange and interfaces Part 4 - Pattern approval tests Part 5 - Initial ve
25、rification tests Part 6 - Installation, commissioning, 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 Re
26、public, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Copyright European Committee for Standardization Prov
27、ided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 1434-2:2007 (E) 5 1 Scope This European Standard specifies the constructional requirements and applies to heat meters, that is to instruments intended for measuring the heat which,
28、 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. Pressure safety requirements are not covered
29、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 document. For dated references, only the edition cited applies. For undated references, th
30、e latest edition of the referenced document (including any amendments) applies. EN 1434-1:2007, Heat meters Part 1: General requirements prEN 1434-3, Heat meters Part 3: Data exchange and interfaces EN 60751:1995, Industrial platinum resistance thermometer sensors (IEC 60751:1983 + A1:1986) EN 60947
31、-5-6, Low-voltage switchgear and controlgear Part 5-6: Control circuit devices and switching elements DC interface for proximity sensors and switching amplifiers (NAMUR) (IEC 60947-5- 6:1999) EN ISO 228-1, Pipe threads where pressure tight joints are not made on the threads Part 1: Dimensions, toler
32、ances and designation (ISO 228-1:2000) ISO 4903, Information technology Data communication 15-pole DTE/DCE interface connector and contact number assignments ISO 7005-1, Metallic flanges Part 1: Steel flanges ISO 7005-2, Metallic flanges Part 2: Cast iron flanges ISO 7005-3, Metallic flanges Part 3:
33、 Copper alloy and composite flanges 3 Temperature sensors 3.1 General The temperature sensor sub-assembly shall consist of platinum resistance temperature sensors selected as matched pairs. Other types of temperature sensor pairs may be used, where the sub-assembly consists, inseparably, of temperat
34、ure sensors and calculator. The maximum admissible working pressure shall be declared by the supplier. Where no dimensional tolerance is specified, the values shall be taken from Table 1. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduc
35、tion or networking permitted without license from IHS-,-,-EN 1434-2:2007 (E) 6 Table 1 Tolerances Dimension mm 0,5 up to 3 over 3 up to 6 over 6 up to 30 over 30 up to 120 over 120 up to 400 Tolerance mm 0,2 0,3 1 1,5 2,5 3.2 Mechanical design 3.2.1 General For pipe sizes up to and including DN 250,
36、 3 different temperature sensor types are standardised: direct mounted short probes - Type DS; direct mounted long probes - Type DL; pocket mounted long probes - Type PL. Types PL and DL can be either head probes or have permanently connected signal leads. Type DS shall have permanently connected si
37、gnal leads only. 3.2.2 Materials of temperature probe sheath and pocket The temperature pocket and the protective sheath of direct mounted probes shall be of a material, that is adequately strong and resistant to corrosion and has the requisite thermal conductivity. A suitable material has been show
38、n to be EN 10088-3 - X6 Cr Ni Mo Ti 17 12 2 3.2.3 Dimensions of direct mounted short probes - Type DS The dimensions shall be as given in Figure 1. Further non-normative information is given in Annex A, Figure A.1. The qualifying immersion depth shall be 20 mm or less if so specified by the supplier
39、. 3.2.4 Dimensions of direct mounted long probes - Type DL The dimensions shall be as given in Figure 2. Further information is given in Annex A, Figures A.2 and A.3. The qualifying immersion depth shall be 50 % of the length B or less if so specified by the supplier. Copyright European Committee fo
40、r Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 1434-2:2007 (E) 7 Dimensions in millimetres Key 1 temperature sensing element 2 protective sheath 3 sealing ring Figure 1 Temperature probes type DS Copyright
41、 European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 1434-2:2007 (E) 8 Dimensions in millimetres Key G 1/2 B thread in accordance with EN ISO 228-1 A: 30 mm or 50 mm for PT1000 Alternative
42、lengths B C head probe only 85 105 120 140 210 230 1 temperature sensing element 2 protective sheath 3 sealing face 4 outline of head probe 5 outline of permanently connected signal lead probe 6 inlet for signal cable 9 mm Figure 2 Temperature probes type DL (head or cable) Copyright European Commit
43、tee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 1434-2:2007 (E) 9 3.2.5 Dimensions of pocket mounted long probes - Type PL The dimensions shall be as given in Figure 3. Further information is given in
44、 Annex A, Figures A.4 and A.5. The qualifying immersion depth shall be 50 % of the length B for the shortest pocket specified or less if so specified by the supplier. 3.2.6 Dimensions of temperature pocket The temperature pocket is designed for use with type PL temperature probes only. It is designe
45、d to be capable of being inserted through a pipe wall to which has been externally brazed or welded a boss (see Annex A, Figure A.6 a) and b) and in this respect only, it is interchangeable with a direct mounted long probe of corresponding insertion length. The dimensions shall be as given in Figure
46、 4. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 1434-2:2007 (E) 10 Dimensions in millimetres Key 1)Corresponding to c11 in ISO 286-2, rounded to 2 decimals A: 30 mm or 50
47、mm for PT1000 Alternative lengths B (head probe only) 105 140 230 1 temperature sensing element 2 outline of head probe 3 outline of permanently connected signal lead probe 4 inlet for signal cable 9 mm Figure 3 temperature probes Type PL (head or cable) Copyright European Committee for Standardizat
48、ion Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 1434-2:2007 (E) 11 Dimensions in millimetres Key 1)Corresponding to H11 in ISO 286-2 rounded to 2 decimals G 1/2 B thread in accordance with EN ISO 228-1 Alternative lengths C D 85 100 120 135 210 225 1 sealing face 2 probe clamping screw with provision for security sealing Figure 4 Temperature pocket 3.2.7 Design of short p
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