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1、BRITISH STANDARD BS EN 1434-2:2007 Heat meters Part 2: Constructional requirements The European Standard EN 1434-2:2007 has the status of a British Standard ICS 17.200.10 ? Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Wed Oct 10 09:59:51 GMT+00:00 2007, Uncontrolled Copy
2、, (c) BSI BS EN 1434-2:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2007 BSI 2007 ISBN 978 0 580 50848 6 National foreword This British Standard was published by BSI. It is the UK implementation of EN 1434-2:2007. It supersedes
3、 BS EN 1434-2:1997 which is withdrawn. 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, Volume flow-rate methods. A list of organizations represented on this committee can be obtained on reque
4、st 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 cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments
5、 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Wed Oct 10 09:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1434-2 February 2007 ICS 17.200.10Supersedes EN 1434-2:1997 English Version Heat meters - Part 2: Constructio
6、nal requirements Compteurs dnergie thermique - Partie 2: Prescriptions de fabrication Wrmezhler - Teil 2: Anforderungen an die Konstruktion This 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 cond
7、itions for giving this European 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 Management Centre or to any CEN member. This European Standard exists in thr
8、ee official versions (English, 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 Management Centre has the same status as the official versions. CEN members are the national standards bodies of
9、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, Sweden, Switzerland and United Kingdom. EUROPEAN
10、COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2007 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1434-2:2007: E Licensed Copy: In
11、stitute Of Technology Tallaght, Institute of Technology, Wed Oct 10 09:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 1434-2:2007 (E) 2 Contents Page Foreword4 1 Scope 5 2 Normative references5 3 Temperature sensors 5 3.1 General5 3.2 Mechanical design.6 3.2.1 General6 3.2.2 Materials of temper
12、ature probe sheath and pocket.6 3.2.3 Dimensions of direct mounted short probes - Type DS6 3.2.4 Dimensions of direct mounted long probes - Type DL6 3.2.5 Dimensions of pocket mounted long probes - Type PL9 3.2.6 Dimensions of temperature pocket9 3.2.7 Design of short probes with respect to installa
13、tion.11 3.2.8 Design of long probes with respect to installation11 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 leads14 3.3.4 Temperature sensors for the 2-wire method 14 3.3.5 Temperature sensors f
14、or the 4-wire method 14 3.3.6 Thermal response time .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 device17 5 Calculators .17 5.1 Mechanical dimensions for calculators for
15、domestic use.17 5.2 Terminals - specification and 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
16、 Interfaces between sub-assemblies 20 7.1 Definitions for pulse device interfaces21 7.1.1 General21 7.1.2 Electrical connection.21 7.1.3 Classification of pulse output devices21 7.1.4 Timing and electrical parameters for pulse output devices (other than test signals)22 7.1.5 Classification of pulse
17、input devices 22 7.1.6 Timing and electrical parameter for pulse input devices23 7.1.7 Compatibility23 8 Marking and security seals.24 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Wed Oct 10 09:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ? EN 1434-2:2007 (E) 3 8.1 M
18、arking.24 8.1.1 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
19、 Annex C (informative) 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 specifications40 A
20、nnex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 2004/22/EC, MID41 Bibliography42 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Wed Oct 10 09:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ? EN 1434-2:2007
21、(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 endorsement, at the lat
22、est 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 verification tests
23、 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 Republic, Denmark,
24、 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. Licensed Copy: Institute Of Technology Tallaght, Institute of Technol
25、ogy, Wed Oct 10 09:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ? 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, in a heat-exchange circuit, is absorbed (cooli
26、ng) 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 by this European Standard. Surface mounted temp
27、erature 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, the latest edition of the referenced document (in
28、cluding 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 60947-5-6, Low-voltage switchgear and controlgear Pa
29、rt 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, tolerances and designation (ISO 228-1:2000) ISO 4903
30、, 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: Copper alloy and composite flanges 3 Temperatu
31、re 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 temperature sensors and calculator. The maximum admissi
32、ble working pressure shall be declared by the supplier. Where no dimensional tolerance is specified, the values shall be taken from Table 1. Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Wed Oct 10 09:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ? EN 1434-2:2007 (E) 6
33、 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, 3 different temperature sensor types are standardised: direct mounted short p
34、robes - 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 signal leads only. 3.2.2 Materials of temperature probe sheath and pocket The te
35、mperature 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 shown to be EN 10088-3 - X6 Cr Ni Mo Ti 17 12 2 3.2.3 Dimensions of direct mounted
36、 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. 3.2.4 Dimensions of direct mounted long probes - Type DL The dimensions shal
37、l 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. Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Wed Oct 10 09:59:51 GMT+00:00 2007,
38、 Uncontrolled Copy, (c) BSI ? 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 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Wed Oct 10 09:59:51 GMT+00:00 2007, Uncontro
39、lled Copy, (c) BSI ? EN 1434-2:2007 (E) 8 Dimensions in millimetres Key G 1/2 B thread in accordance with EN ISO 228-1 A: 10 m - restricted only by voltage drop Shielded cable a possible requirement to be specified by the supplier Twisted cable a possible requirement to be specified by the supplier
40、C.2 Local external DC supply C.2.1 Voltage Recommended nominal levels 6 V, 3,6 V, 3 V Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Wed Oct 10 09:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 1434-2:2007 (E) 40 C.2.2 Other data Table C.1 Standardized levels for exte
41、rnal powering Nominal voltage 6 V 3,6 V 3 V Max. average current 100 mA 10/20/50/100/200 A 10/20/50/100/200 A Tolerance at average current 5,4 V to 6,6 V3,4 V to 3,8 V 2,8 V to 3,3 V Peak current 100 mA 10 mA 5 mA Min. voltage at peak current 5,4 V 3,2 V 2,7 V C.3 Power supply specifications The sup
42、plier should make available data sheets containing at least the following information: supplier; type identification; external or remote power supply; nominal voltage level; available current (peak and long term mean value); total available energy (if battery); cabling requirement (maximum cable len
43、gth and possible requirement for shielded or twisted cable). Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Wed Oct 10 09:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 1434-2:2007 (E) 41 Annex ZA (informative) Relationship between this European Standard and the Essen
44、tial Requirements of EU Directive 2004/22/EC, MID This European Standard has been prepared under a mandate given to CEN by the European Commission to provide a means of conforming to Essential Requirements of the New Approach Directive 2004/22/EC on measuring instruments. Once this standard is cited
45、 in the Official Journal of the European Communities under that Directive and has been implemented as a national standard in at least one Member State, compliance with all the normative clauses in Parts 1, 2, 4 and 5 of this standard confers, within the limits of the scope of this standard, a presum
46、ption of conformity with the relevant Essential Requirements of that Directive and associated EFTA regulations. WARNING Other requirements and other EU Directives may be applicable to the product(s) falling within the scope of this standard. NOTE A corresponding annex is included in EN 1434-1, EN 14
47、34-4 and EN 1434-5. Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Wed Oct 10 09:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 1434-2:2007 (E) 42 Bibliography 1 EN 10088-3, Stainless steels Part 3: Technical delivery conditions for semi-finished products, bars, rods,
48、 wire, sections and bright products of corrosion resisting steels for general purposes 2 ISO 286-2, ISO system of limits and fits Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Wed Oct 10
49、 09:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSI blank Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Wed Oct 10 09:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS EN 1434-2:2007 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standar