prEN 1434-5
(Main)Thermal energy meters - Part 5: Initial verification tests
Thermal energy meters - Part 5: Initial verification tests
This document specifies initial verification tests for thermal energy meters. Thermal energy meters are instruments intended for measuring the energy which in a heat-exchange circuit is absorbed (cooling) or given up (heating) by a liquid called the heat-conveying liquid. The thermal energy meter indicates the quantity of thermal energy in legal units.
Electrical safety requirements are not covered by this document.
Pressure safety requirements are not covered by this document.
Surface mounted temperature sensors are not covered by this document.
This document covers meters for closed systems only, where the differential pressure over the thermal load is limited.
Thermische Energiemessgeräte - Teil 5: Tests für Konformitätsuntersuchungen und Eichungen
Dieses Dokument legt Ersteichungen für thermische Energiemessgeräte fest. Thermische Energiemessgeräte sind Messgeräte, die dazu bestimmt sind, die Energie zu messen, die in einem Wärmetauschkreislauf von einer als Wärmeträgerflüssigkeit bezeichneten Flüssigkeit aufgenommen (Kühlung) oder abgegeben (Heizung) wird. Das thermische Energiemessgerät zeigt die Menge der thermischen Energie in gesetzlichen Einheiten an.
Anforderungen an die elektrische Sicherheit sind nicht Gegenstand dieses Dokuments.
Anforderungen an die Drucksicherheit sind nicht Gegenstand dieses Dokuments.
Oberflächenmontierte Temperaturfühlern sind nicht Gegenstand dieses Dokuments.
Dieses Dokument behandelt nur Messgeräte für geschlossene Systeme, bei denen der Differenzdruck über die thermische Last begrenzt ist.
Compteurs d'énergie thermique - Partie 5 : Essais de vérification initiaux
Le présent document spécifie les essais de vérification primitive pour les compteurs d’énergie thermique. Les compteurs d’énergie thermique sont des instruments destinés à mesurer l’énergie thermique qui, dans un circuit d’échange thermique, est absorbée (refroidissement) ou cédée (chauffage) par un liquide appelé « liquide caloporteur ». Le compteur d’énergie thermique fournit la quantité d’énergie thermique en unités de mesure légales.
Le présent document ne traite pas des prescriptions de sécurité électrique.
Le présent document ne traite pas des prescriptions de sécurité relative à la pression.
Le présent document ne traite pas des sondes de température montées en surface.
Le présent document couvre les compteurs pour les systèmes fermés uniquement, où la pression différentielle dans la charge thermique est limitée.
Merilniki toplote - 5. del: Preskusi prve overitve
General Information
RELATIONS
Standards Content (sample)
SLOVENSKI STANDARD
oSIST prEN 1434-5:2020
01-november-2020
Merilniki toplote - 5. del: Preskusi prve overitve
Thermal energy meters - Part 5: Initial verification tests
Thermische Energiemessgeräte - Teil 5: Tests für Konformitätsuntersuchungen und
Eichungen
Compteurs d'énergie thermique - Partie 5 : Essais de vérification initiaux
Ta slovenski standard je istoveten z: prEN 1434-5
ICS:
17.200.20 Instrumenti za merjenje Temperature-measuring
temperature instruments
oSIST prEN 1434-5:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 1434-5:2020
DRAFT
EUROPEAN STANDARD
prEN 1434-5
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2020
ICS 17.200.20 Will supersede EN 1434-5:2015+A1:2019
English Version
Thermal energy meters - Part 5: Initial verification tests
Compteurs d'énergie thermique - Partie 5 : Essais de Thermische Energiemessgeräte - Teil 5: Tests für
vérification initiaux Konformitätsuntersuchungen und EichungenThis draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 176.If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN 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 standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1434-5:2020 E
worldwide for CEN national Members.---------------------- Page: 3 ----------------------
oSIST prEN 1434-5:2020
prEN 1434-5:2020 (E)
Contents Page
European foreword ....................................................................................................................................................... 3
1 Scope .................................................................................................................................................................... 4
2 Normative references .................................................................................................................................... 4
3 Terms and definitions ................................................................................................................................... 4
4 General ................................................................................................................................................................ 4
5 Uncertainty of test equipment .................................................................................................................... 5
6 Tests to be carried out ................................................................................................................................... 5
6.1 General ................................................................................................................................................................ 5
6.2 Flow sensors ..................................................................................................................................................... 5
6.3 Temperature sensor pair ............................................................................................................................. 6
6.3.1 Error in temperature difference ................................................................................................................ 6
6.3.2 Insulation resistance ..................................................................................................................................... 6
6.3.3 Single temperature sensor for smart metering applications .......................................................... 7
6.4 Calculator ........................................................................................................................................................... 7
6.5 Calculator and temperature sensor pair ................................................................................................ 7
6.5.1 Heating and cooling applications .............................................................................................................. 7
6.5.2 Calculator with single temperature sensor for smart metering applications .......................... 8
6.6 Combined thermal energy meter .............................................................................................................. 8
6.7 Complete meter ............................................................................................................................................... 8
6.8 Meters for heat-conveying liquids other than water ......................................................................... 9
6.8.1 Flow sensor ....................................................................................................................................................... 9
6.8.2 Temperature sensor pair ............................................................................................................................. 9
6.8.3 Calculator ........................................................................................................................................................ 10
7 Documentation to be supplied ................................................................................................................ 10
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/32/EU aimed to be covered ..................................................... 11
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prEN 1434-5:2020 (E)
European foreword
This document (prEN 1434-5:2020) has been prepared by Technical Committee CEN/TC 176 “Thermal
heat meters”, the secretariat of which is held by SIS.This document is currently submitted to the CEN Enquiry.
This document supersedes EN 1434-5:2015+A1:2019.
EN 1434, Thermal energy meters consists of the following parts:
— Part 1: General requirements
— Part 2: Constructional requirements
— Part 3: Data exchange and interfaces
— Part 4: Pattern approval tests
— Part 5: Initial verification tests
— Part 6: Installation, commissioning, operational monitoring and maintenance
In comparison to EN 1434-5:2015+A1:2019, the following changes have been made:
— the third calibration temperature Θ for extrapolation error of sensor pairs was changed in Table 1.
This document has been prepared under a standardization request given to CEN by 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 1434-3 is maintained by CEN/TC 294.
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prEN 1434-5:2020 (E)
1 Scope
This document specifies initial verification tests for thermal energy meters. Thermal energy meters are
instruments intended for measuring the energy which in a heat-exchange circuit is absorbed (cooling) or
given up (heating) by a liquid called the heat-conveying liquid. The thermal energy meter indicates the
quantity of thermal energy in legal units.Electrical safety requirements are not covered by this document.
Pressure safety requirements are not covered by this document.
Surface mounted temperature sensors are not covered by this document.
This document covers meters for closed systems only, where the differential pressure over the thermal
load is limited.2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
prEN 1434-1:2020, Thermal energy meters — Part 1: GeneralEN 60751, Industrial platinum resistance thermometers and platinum temperature sensors (IEC 60751)
3 Terms and definitionsFor the purposes of this document, the terms and definitions given in prEN 1434-1:2020 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/— ISO Online browsing platform: available at https://www.iso.org/obp
4 General
Initial verification of a measuring instrument is a series of tests and visual examinations carried out to
determine whether an instrument manufactured to replicate a given pattern conforms to that pattern
and to regulations, and that its metrological characteristics lie within the limits of the maximum
permissible errors. If the instrument passes all tests and examinations, it is given legal character by its
acceptance as evidenced by stamping and/or issuance of a certificate of verification.
The provisions of this standard also apply to the re-verification of thermal energy meters.
The instrument shall be tested under rated operating conditions at the extremes and midpoints of its
ranges.Initial verification is divided into metrological, technical and administrative phases.
In tests of a thermal energy meter as a combined instrument, the flow sensor, the temperature sensors
and the calculator shall each be tested separately.Unless otherwise stated in the certificate of pattern approval, the verification shall be carried out in
accordance with this standard.Modern thermal energy meters are mainly equipped with CMOS microprocessors with a very low power
consumption, allowing battery operation. Testing and adjusting of this type of meter needs a completely
different approach. Until now, almost every meter type needed its own test equipment to handle the
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prEN 1434-5:2020 (E)
manufacturer's specific requirements. This is a very complicated and expensive way for users of several
types of meters and for initial verification institutes. The more different types of thermal energy meters
a user has installed, the more testing equipment he may need. An economical testing of several meters
should be possible and an easy adaptation to the existing test bench is of great interest.
Since this problem came up, experts have been researching an acceptable solution to it. Details of one
example of an acceptable solution are given in “Normierter Wärmezähler Adapter” (Standardized heat
meter adapter) Version 1.5 of September 2000, AGFW Merkblatt 6, Band 2, Frankfurt, Germany.
5 Uncertainty of test equipmentStandards, instruments and methods used in verification shall suit the purpose, be traceable to more
precise standards and be part of a reliable calibration programme.The uncertainties associated with these standards, methods and measuring instruments shall always be
known. They shall either:a) not exceed 1/5 of the MPE (maximum permissible error) of the EUT (equipment under test),
or, if exceeding 1/5 of the MPE,b) if the uncertainty is higher than 1/5 of MPE, the value of the difference between uncertainty and 1/5
MPE shall be subtracted from MPE, to calculate a new reduced MPE.It is recommended that option a) is used.
6 Tests to be carried out
6.1 General
If the error determined lies outside the MPE, the test shall be repeated twice. The test is then declared
satisfactory if both— the arithmetic mean of the result of the three tests,
and
— at least two of the test results are within or at the MPE.
The meters shall not e
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