1、BRITISH STANDARDBS EN 1434-6:2007Heat meters Part 6: Installation, commissioning, operational monitoring and maintenanceThe European Standard EN 1434-6:2007 has the status of a British StandardICS 17.200.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g4
2、9g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Wed Sep 05 07:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS EN 1434-6:2007This British Standard was published under the authority of the Standards Policy and St
3、rategy Committee on 31 May 2007 BSI 2007ISBN 978 0 580 50851 6National forewordThis British Standard was published by BSI. It is the UK implementation of EN 1434-6:2007. It supersedes BS EN 1434-6:1997 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee CP
4、I/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 request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are
5、responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Wed Sep 05 07:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEUROPEAN STANDARDNORME EUROPENN
6、EEUROPISCHE NORMEN 1434-6February 2007ICS 17.200.10 Supersedes EN 1434-6:1997 English VersionHeat meters - Part 6: Installation, commissioning, operationalmonitoring and maintenanceCompteurs dnergie thermique - Partie 6: Installation, miseen service, surveillance et maintenanceWrmezhler - Teil 6: Ei
7、nbau, Inbetriebnahme,berwachung und WartungThis 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.
8、Up-to-date lists and 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 translationun
9、der 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 members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, H
10、ungary, Iceland, Ireland, 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:
11、 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. No. EN 1434-6:2007: ELicensed Copy: Wang Bin, na, Wed Sep 05 07:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-6:2007 (E) 2 Contents Page For
12、eword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Requirements.5 4.1 Design requirements .5 4.2 Installation requirements 5 4.3 Heat meter commissioning.5 4.3.1 General5 4.3.2 Certification check.6 4.3.3 Installation check.6 4.3.4 Heat meter security6 Annex A (informative) Heat
13、meter installation .7 A.1 Introduction7 A.2 Criteria for the selection of a heat meter.7 A.3 Quality of the heat conveying liquid7 A.3.1 General7 A.3.2 Primary water quality 8 A.3.3 Secondary water quality .8 A.4 Heat meter flow circuit design8 A.5 Additional recommendations for cooling application
14、.9 Annex B (informative) Heat meter operational monitoring and maintenance.13 B.1 Introduction13 B.2 Heat meter service life.13 B.3 Heat meter monitoring procedures13 B.4 Maintenance check list14 B.5 Replacement of failed heat meters 14 Annex C (informative) Suggested gauge for checking the dimensio
15、ns of installed temperature sensor pockets.16 Licensed Copy: Wang Bin, na, Wed Sep 05 07:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-6:2007 (E) 3 Foreword This document (EN 1434-6:2007) has been prepared by Technical Committee CEN/TC 176 “Heat Meters”, the secretariat of which is held by
16、 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 supersedes EN 1434-6:1997. The o
17、ther parts are: Part 1 - General requirements Part 2 - Constructional requirements Part 3 - Data exchange and interfaces Part 4 - Pattern approval tests Part 5 - Initial verification tests According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countr
18、ies 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, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain
19、, Sweden, Switzerland and United Kingdom. Licensed Copy: Wang Bin, na, Wed Sep 05 07:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-6:2007 (E) 4 1 Scope This European Standard specifies installation, commissioning, operational monitoring and maintenance and applies to heat meters, that is t
20、o 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 not covered by this European Sta
21、ndard. 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 document. For dated references, only t
22、he 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 3 Terms and definitions For the purpose of this document, the terms, definitions and symbols given in Clause 4
23、of EN 1434-1:2007 and the following apply. 3.1 heating system heating installation of the dwelling or premises, including the exchange circuit, the heat meter, the associated fittings and the electrical equipment NOTE The heating system typically commences and finishes at the two connections to the
24、heat mains. 3.2 heat mains heat suppliers distribution pipes to which the consumers installation is connected 3.3 flow and return limbs pipes connecting the heating system to the heat mains 3.4 primary circuit circuit hydraulically connected to the heat mains 3.5 secondary circuit circuit hydraulica
25、lly separated from the primary circuit. 3.6 competent authority persons or organizations charged with the responsibility for the heat meter and/or its installation Licensed Copy: Wang Bin, na, Wed Sep 05 07:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-6:2007 (E) 5 4 Requirements 4.1 Desig
26、n requirements When designing the heating system, the heat meter suppliers installation instructions shall be followed. NOTE For DN 25 and smaller, it is possible to use short probes. To achieve good temperature sensitivity, probes should be installed without temperature pockets. Temperature pockets
27、 should only be used when required for safety reasons. 4.2 Installation requirements The heat meter shall be installed in accordance with the suppliers instructions. Before installation, the circuit into which the flow sensor is to be installed shall be thoroughly flushed to remove debris. The strai
28、ner, where fitted, shall be cleaned. The heat meter shall be protected from the risk of damage by shock and vibration induced by the surround-ings at the place of installation. The heat meter shall not be subjected to undue stresses caused by pipes and fittings. The pipe lines of the heating system
29、up and downstream of the heat meter shall be adequately anchored. Heat meters designed to operate from an AC mains supply shall be wired in accordance with wiring regulations applicable. The AC-mains power supply shall be secured against accidental interruption. However, circuit protection shall be
30、incorporated according to the state of the art, to safely disconnect the device when electrical problems occur. Measurement signal leads shall not be laid directly alongside other leads such as mains supply cables, low voltage supply cables and data communication cables and shall be independently su
31、pported. The separation between those groups shall not be less than 50 mm. Mains and external signal cables longer than 10 m shall in areas where lightning is frequent be protected with an external lightning surge protection at the cable entrance to the building. Each signal lead between temperature
32、 sensors and calculator shall be one continuous length without joints. Signal circuits between parts of a heat meter shall be so installed as to deter unauthorized interference and disconnection. Precautions shall be taken to prevent damage to the heat meter by unfavourable hydraulic conditions (cav
33、itation, surging, water hammer). When the installation of the heat meters is complete, it shall be inspected and approved by representatives of the competent authority in accordance with established procedures. 4.3 Heat meter commissioning 4.3.1 General The responsibility for the carrying out of eac
34、h of the inspection phases is not necessarily restricted to one person or one authority, but however arranged, the following points shall be addressed and responsibilities defined. Licensed Copy: Wang Bin, na, Wed Sep 05 07:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-6:2007 (E) 6 4.3.2 C
35、ertification check Before commissioning commences it shall be ascertained firstly, that the correct heat meter has been installed by comparing the heat meter suppliers type and size designation against the system specification. Secondly, it shall be checked that the heat meter, if a complete instrum
36、ent, bears the correct pattern approval mark and, if a combined instrument, that each of the meters sub-assemblies bear the pattern approval marks stipulated in the pattern approval document for the heat meter installed. 4.3.3 Installation check The following points shall be checked: Is the flow sen
37、sor mounted in the correct position and with the correct flow direction? Does the temperature sensor fit correctly into the pocket (pockets shorter than 140 mm shall be marked “EN 1434“ or dimensions checked)? Are the temperature sensors correctly installed? Is the heat meter installed at a safe dis
38、tance from sources of electromagnetic interference (switchgear, electric motors, fluorescent lights)? Where called for, has the heat meter been correctly earthed? Are the accessories correctly installed according to the installation instructions of the supplier and operator? Is the heat meter seen t
39、o be functioning when the heating system starts operating? 4.3.4 Heat meter security At the completion of commissioning, the heat meters protective devices shall be sealed by representatives of the competent authority. For any subsequent adjustment of the meter or for replacement of sub-assemblies,
40、batteries etc., it will thus be necessary to break one or more seals. Seals shall be renewed in accordance with appropriate regulations. Licensed Copy: Wang Bin, na, Wed Sep 05 07:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-6:2007 (E) 7 Annex A (informative) Heat meter installation A.1 I
41、ntroduction This annex gives recommendations for the installation of heat meters into the heating system of which they form a component. It includes reference to the quality of the heat conveying liquid and contains recommendations of direct concern to the distributor of heat, the building owner and
42、 the final consumer. A.2 Criteria for the selection of a heat meter The type, size, accuracy and environmental class of a heat meter is determined according to the operating and environmental conditions of the installation, taking into account particularly the following: a) pressure of the heat conv
43、eying liquid; b) physical and chemical characteristics of the heat conveying liquid; c) acceptable pressure loss across the heat meter; d) accuracy requirements; e) temperature ranges in flow and return limbs to the heating system and the system temperature difference; f) expected maximum and minimu
44、m flow rate of the heat conveying liquid; g) required thermal power of the heating system; h) nature of the flow rate through the heat meter, whether constant, variable or intermittent; i) requirements concerning the electrical supply to the heat meter; j) special requirements of the space around th
45、e heat meter for ease of reading, security installation and servicing of the meter; k) requirements for connections, i.e. flanges, fittings and meter dimensions. A.3 Quality of the heat conveying liquid A.3.1 General Heat meters in general are constructed to withstand variations in the chemical cons
46、tituents and the acidity or alkalinity of the heat conveying liquid. However, the presence of solids in suspension and their deposition onto the surfaces of the passages of the heat meter or their effect on the moving parts of a mechanical flow sensor causes degradation of the performance with time.
47、 Licensed Copy: Wang Bin, na, Wed Sep 05 07:59:51 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 1434-6:2007 (E) 8 Solids may be present as products of corrosion from the materials of which the heating system and the supply mains are constructed. They may also be created, in the case of hot water syst
48、ems, within the circuit by the action of heat on the chemicals contained in the water. A.3.2 Primary water quality The quality of the water in primary circuits, experience shows, is necessarily high and closely controlled because of its boiler origin. Hence heat meters in primary circuits tend to fu
49、nction in a satisfactory environment. A.3.3 Secondary water quality Heat meters functioning in secondary circuits, experience shows, are more prone to problems arising from the water quality. Secondary water quality is normally the responsibility of the building owner. When purchasing or specifying heat meters the owner of the meter should consult with the meter supplier to determine any particular water requirements. A.4 Heat meter flow circuit design Circuit design should be arranged/modified to ensure efficiency of meter operation and should take acco
