1、BSI Standards PublicationBS EN 1434-2:2015Heat metersPart 2: Constructional requirementsBS EN 1434-2:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 1434-2:2015. It supersedes BS EN 1434-2:2007 which is withdrawn.The UK participation in its preparation was
2、entrusted to Technical Committee CPI/30, Measurement of fluid flow in closed conduits.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 i
3、ts correct application. The British Standards Institution 2015. Published by BSI Standards Limited 2015ISBN 978 0 580 84655 7 ICS 17.200.10 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy
4、 and Strategy Committee on 30 November 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 1434-2:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1434-2 November 2015 ICS 17.200.10 Supersedes EN 1434-2:2007English Version Heat meters - Part 2: Constructional
5、 requirements Compteurs dnergie thermique - Partie 2: Prescriptions de fabrication Wrmezhler - Teil 2: Anforderungen an die Konstruktion 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 condi
6、tions 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-CENELEC Management Centre or to any CEN member. This European Standard exists
7、 in three 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-CENELEC Management Centre has the same status as the official versions. CEN members are the national stand
8、ards bodies of Austria, Belgium, 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, Slo
9、venia, Spain, Sweden, Switzerland, Turkey and United 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 reserve
10、d worldwide for CEN national Members. Ref. No. EN 1434-2:2015 EBS EN 1434-2:2015EN 1434-2:2015 (E) 2 Contents Page European foreword . 3 1 Scope 5 2 Normative references 5 3 Terms and definitions . 5 4 Temperature sensors 6 4.1 General 6 4.2 Mechanical design . 6 4.3 Platinum temperature sensor . 11
11、 4.4 Other temperature sensors 13 5 Flow sensors 13 5.1 Maximum admissible working pressure, PS in bar . 13 5.2 Sizes and dimensions 14 5.3 Test signal output. 15 5.4 Adjusting device . 15 6 Calculators 16 6.1 Terminals - specification and identification 16 6.2 Batteries 18 6.3 Dynamic behaviour . 1
12、8 6.4 Test signal output. 18 6.5 24 h interruption in supply voltage . 19 7 Complete meter 19 8 Interfaces between sub-assemblies 19 8.1 General . 19 8.2 Definitions for pulse device interfaces . 19 9 Marking and security seals . 22 9.1 Marking 22 9.2 Sites for marking 24 9.3 Security seals . 24 Ann
13、ex A (informative) Examples of temperature sensors 25 Annex B (normative) Input and output test signals 36 Annex C (informative) Low voltage Power Supply for heat meters and their sub-assemblies 38 C.1 Remote supply . 38 C.2 Local external DC supply . 38 C.3 Power supply specifications . 38 Annex ZA
14、 (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 2004/22/EC, MID . 40 Bibliography . 41 BS EN 1434-2:2015EN 1434-2:2015 (E) 3 European foreword This document (EN 1434-2:2015) has been prepared by Technical Committee CEN/TC 176 “Heat meters”, t
15、he 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 by May 2016, and conflicting national standards shall be withdrawn at the latest by May 2016. Attention is draw
16、n 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 rights. This document supersedes EN 1434-2:2007. This document has been prepared under a mandate given to CEN b
17、y 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, which is an integral part of this document. EN 1434-2, Heat meters consists of the following parts: Part 1: Gene
18、ral requirements Part 2: Constructional requirements Part 3: Data exchange and interfaces1) Part 4: Pattern approval tests Part 5: Initial verification tests Part 6: Installation, commissioning, operational monitoring and maintenance In comparison to EN 1434-2:2007, the following changes have been m
19、ade: additional functionalities for smart metering applications are added; minimum requirements for test signal output of calculators are added; minimum requirements for test data interface of complete heat meters are added; new forms of pockets and sensors and parmeter setting and adjustment throug
20、h interface are added. 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of
21、 Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, 1) EN 1434-3 is maintained by CEN/TC 294. BS EN 1434-2:2015EN 1434-2:2015 (E) 4 Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
22、United Kingdom. BS EN 1434-2:2015EN 1434-2:2015 (E) 5 1 Scope This European Standard specifies the constructional requirements for heat meters. Heat meters are instruments intended for measuring the energy which in a heat-exchange circuit is absorbed (cooling) or given up (heating) by a liquid calle
23、d 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 temperature sensors are not covered by this Eur
24、opean Standard. This standard covers meters for closed systems only, where the differential pressure over the thermal load is limited. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated
25、 references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1092-1, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PN designated Part 1: Steel flanges EN 1092-2, Flan
26、ges and their joints Circular flanges for pipes, valves, fittings and accessories, PN designated Part 2: Cast iron flanges EN 1092-3, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PN designated Part 3: Copper alloy flanges EN 1434-1:2015, Heat meters Part 1:
27、General requirements EN 1434-3, Heat Meters Part 3: Data exchange and interfaces EN 60751:2008, Industrial platinum resistance thermometers and platinum temperature sensors (IEC 60751:2008) EN 60947-5-6, Low-voltage switchgear and controlgear Part 5-6: Control circuit devices and switching elements
28、DC interface for proximity sensors and switching amplifiers (NAMUR) (IEC 60947-5-6) 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) ISO 4903, Information technology Data communication 15-pole DTE/DCE interf
29、ace connector and contact number assignments 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1434-1:2015 apply. BS EN 1434-2:2015EN 1434-2:2015 (E) 6 4 Temperature sensors 4.1 General The temperature sensor sub-assembly shall consist of platinum resis
30、tance 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 admissible working pressure shall be declared by the manufacturer. Where no dimensional tolerance
31、 is specified, the values shall be taken from Table 1. 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 4.2 Mechanical design 4.2.1 General For pipe sizes up to and including DN 250, 3 different temperature
32、 sensor types are standardized: 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 signal leads only. 4.2.2 M
33、aterials 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 shown to be EN 10088-3 X6 Cr
34、Ni Mo Ti 17 12 2. 4.2.3 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 manufacturer. BS EN 1434-2:2015EN
35、1434-2:2015 (E) 7 Dimensions in millimetres Key 1 temperature sensing element 2 protective sheath 3 sealing ring 4 ejection device A: 15 mm B: = 27,5 mm or = 38 mm or 60 mm Figure 1 Temperature probes type DS 4.2.4 Dimensions of direct mounted long probes - Type DL The dimensions shall be as given i
36、n 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 manufacturer. BS EN 1434-2:2015EN 1434-2:2015 (E) 8 Dimensions in millimetres Key 1 temperature sensing element 4 outline of head prob
37、e 2 protective sheath 5 outline of permanently connected signal lead probe 3 sealing surface 6 inlet for signal cable 9 mm G B thread in accordance with EN ISO 228-1 A: 30 mm or 50 mm for Pt1000 Alternative lengths B C (head probe only) 85 105 120 140 210 230 Figure 2 Temperature probes type DL (hea
38、d or cable) 4.2.5 Dimensions of pocket mounted long probes - Type PL The dimensions shall be as given in Figure 3. Further information is given in 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 t
39、he manufacturer. 4.2.6 Dimensions of temperature pocket The temperature pocket is designed for use with type PL temperature probes only. It is designed 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.9) and in this respe
40、ct only, it is interchangeable with a direct mounted long probe of corresponding insertion length. The dimensions shall be as given in Figure 4. BS EN 1434-2:2015EN 1434-2:2015 (E) 9 Dimensions in millimetres Key A 30 mm or 50 mm for Pt 1000 Alternative lengths B (head probe only) 105 140 230 1 temp
41、erature sensing element 3 outline of permanently connected signal lead probe 2 outline of head probe 4 inlet for signal cable 9 mm Corresponding to c11 in EN ISO 286-2, rounded to 2 decimals Figure 3 Temperature probes - Type PL (head or cable) BS EN 1434-2:2015EN 1434-2:2015 (E) 10 Dimensions in mi
42、llimetres Key 1 sealing face 2 probe clamping screw with provision for security sealing a Corresponding to H11 in EN ISO 286-2 rounded to 2 decimals G B thread in accordance with EN ISO 228-1 Alternative lengths C D 85 100 120 135 210 225 Figure 4 Temperature pocket 4.2.7 Design of short probes with
43、 respect to installation The sensor shall be mounted perpendicular to the flow and with the sensing element inserted to at least the centre of the pipe. For internal pressures up to 16 bar, the sensor shall be designed to fit in a pipe fitting (see Annex A, Figure A.7). 4.2.8 Design of long probes w
44、ith respect to installation The sensor shall be mounted with the sensing element inserted to at least the centre of the pipe. BS EN 1434-2:2015EN 1434-2:2015 (E) 11 The sensor shall be designed to fit in the following types of installation, (for internal pressures up to PN 16): a) in a pipe DN 50 mo
45、unted with the tip pointing into the flow in a bend (see Annex A, Figure A.11 b), using welded-in boss (see Annex A, Figure A.9). b) in a pipe DN 50 mounted at an angle 45 to the direction of the flow with the tip pointing into the flow (see Annex A, Figure A.11 c), using a welded-in boss (see Annex
46、 A, Figure A.9). c) in a pipe DN 65 to DN 250, mounted perpendicular to the flow (see Annex A, Figure A.11 d), using a welded-in boss (see Annex A, Figure A.9). 4.3 Platinum temperature sensor 4.3.1 Specialized definitions for 2 wire temperature probes Key R1temperature sensing element resistance 1
47、temperature sensing element R2internal wire resistance 2 protective sheath R3signal lead resistance 3 mounting thread 4 signal leads Figure 5 Temperature probe with permanently connected signal leads BS EN 1434-2:2015EN 1434-2:2015 (E) 12 Key R1temperature sensing element resistance 1 temperature se
48、nsing element R2internal wire and terminals resistance 2 protective sheath 3 mounting thread 4 signal leads Figure 6 Head sensor temperature probe 4.3.2 Resistance characteristics The calibration of temperature sensors shall be traceable to national temperature standards. The intermediate values of
49、the heat meter temperature sensor shall be interpolated using Formula (1) as follows: ( )2t01A BRR t t= + (1) where Rtis the resistance value at temperature t in (excluding cable resistance - see Figures 5 and 6); R0is the resistance value at temperature 0 C in (base value) (excluding cable resistance); A is 3,908 3 10-3C-1; B is -5,775 10-7C-2. NOTE It is assumed that the national temperature standards are established with reference to ITS-90 - The Internati
