EN 1434-5:2022

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.
This document covers meters for closed systems only, where the differential pressure over the thermal load is limited.
This document is not applicable to:
-   electrical safety requirements;
-   pressure safety requirements; and
-   surface mounted temperature sensors.

Thermische Energiemessgeräte - Teil 5: Tests für Konformitätsuntersuchungen und Eichungen

Dieses Dokument legt Tests für Konformitätsuntersuchungen und Eichungen (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.
Dieses Dokument behandelt nur Messgeräte für geschlossene Systeme, bei denen der Differenzdruck über die thermische Last begrenzt ist.
Dieses Dokument ist nicht anwendbar für:
—   Anforderungen an die elektrische Sicherheit;
—   Anforderungen an die Drucksicherheit;
—   oberflächenmontierte Temperaturfühler.

Compteurs d’énergie thermique - Partie 5 : Essais de vérification primitive

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 couvre les compteurs pour les systèmes fermés uniquement, où la pression différentielle dans la charge thermique est limitée.
Le présent document ne s’applique pas :
-   aux prescriptions de sécurité électrique ;
-   aux prescriptions de sécurité relatives à la pression ; ni
-   aux sondes de température montées en surface.

Merilniki toplote - 5. del: Preskusi prve overitve

Ta dokument določa preskuse prve overitve merilnikov toplote. Merilniki toplote so instrumenti, namenjeni merjenju energije, ki jo v krogotoku toplotne izmenjave absorbira (hlajenje) ali oddaja (ogrevanje) tekočina, imenovana tekočina za prenos toplote. Merilnik toplote podaja količino toplote v predpisanih enotah.
Ta dokument ne zajema zahtev za električno varnost.
Ta dokument ne zajema tlačnih varnostnih zahtev.
Ta dokument ne zajema površinsko nameščenih senzorjev temperature.
Ta dokument zajema samo števce za zaprte sisteme, pri katerih je diferencialni tlak nad toplotno obremenitvijo omejen.

General Information

• Status: Published
• Publication Date: 06-Sep-2022
• ICS: 17.200.20 - Temperature-measuring instruments
• Technical Committee: CEN/TC 176 - Heat meters
• Drafting Committee: CEN/TC 176/WG 2 - Heat Meters - Requirements, test methods and technical editing
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 07-Sep-2022
• Due Date: 22-Nov-2021
• Completion Date: 07-Sep-2022
• Directive: 2014/32/EU - Directive 2014/32/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of measuring instruments
• Mandate: M/541 - [C(2015)8558] Standardization request in support of the implementation of Directive 2014/32/EU on measuring instruments
• Ref Project: SIST EN 1434-5:2022 - Thermal energy meters - Part 5: Initial verification tests

Relations

• Replaces: EN 1434-5:2015+A1:2019 - Thermal energy meters - Part 5: Initial verification tests
• Effective Date: 14-Sep-2022

Overview - EN 1434-5:2022 (Thermal energy meters - Part 5: Initial verification tests)

EN 1434-5:2022 specifies initial verification tests for thermal energy meters used in closed heat-exchange circuits. It defines the verification scope for meters that measure thermal energy transferred by a heat‑conveying liquid (heating or cooling) and that indicate energy in legal units. The standard applies to combined meters and to separately tested components (flow sensors, temperature sensors and calculators) and excludes electrical and pressure safety requirements and surface-mounted temperature sensors.

Key topics and technical requirements

• Scope & applicability
  • Covers meters for closed systems where differential pressure over the thermal load is limited.
  • Not applicable to electrical safety, pressure safety, or surface-mounted temperature sensors.
• Verification phases
  • Initial verification comprises metrological, technical and administrative tests and visual inspections to confirm conformity with the approved pattern and Maximum Permissible Errors (MPE).
• Uncertainty of test equipment
  • Test equipment and methods must be traceable and calibrated. Uncertainty should not exceed 1/5 of the MPE; if larger, a reduced MPE must be calculated.
• Flow sensor tests
  • Flow verification is performed across defined flow ranges and at standard test temperatures (typically around 50 ± 5 °C for heating and 15 ± 5 °C for cooling). Tests must include cavitation checks and at least one test where the flow signal is routed to the calculator.
• Temperature sensor pair tests
  • Individual sensors are tested in baths at three characteristic temperatures (extremes and midpoint) per EN 60751. Immersion depth ≥ 90%. Insulation resistance ≥ 100 MΩ (10–100 V DC).
  • For smart metering with single sensors, permissible error is ±0.7 K at three representative temperatures (e.g., 10 °C, 30 °C, 50 °C).
• Calculator tests
  • Calculators are tested across defined temperature-difference (ΔΘ) ranges and with simulated flow signals; at least one test must include the meter’s indicating device.
• Combined and alternative liquids
  • Procedures cover combined meters and include provisions for heat‑conveying liquids other than water (flow sensor, temperature sensor and calculator tests adapted accordingly).

Practical applications - who uses EN 1434-5:2022

• Manufacturers - design verification and factory acceptance testing of thermal energy meters.
• Notified bodies and legal metrology authorities - initial type verification, stamping and certification to grant legal character.
• Test laboratories and metrology institutes - traceable calibration and conformity testing following EN 1434-5 test methods.
• District heating/utility operators and installers - acceptance testing when deploying new meters or meter types.
• Smart metering integrators - ensuring temperature-sensor and calculator compliance for digital meters.

Related standards

• EN 1434 series (Part 1: General; Part 2: Constructional; Part 3: Data exchange; Part 4: Pattern approval; Part 6: Installation & maintenance)
• EN 60751:2008 (industrial platinum resistance thermometers)
• Annex ZA links this part to EU Directive 2014/32/EU (measuring instruments).

EN 1434-5:2022 is essential for anyone responsible for metrological conformity and legal verification of thermal energy meters in closed heating/cooling systems.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2022
Nadomešča:
SIST EN 1434-5:2016+A1:2019
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: EN 1434-5:2022
ICS:
17.200.20 Instrumenti za merjenje Temperature-measuring
temperature instruments
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 1434-5
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2022
EUROPÄISCHE NORM
ICS 17.200.20 Supersedes 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 primitive Konformitätsuntersuchungen und Eichungen
This European Standard was approved by CEN on 17 July 2022.

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. 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 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, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1434-5:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General. 5
5 Uncertainty of test equipment . 6
6 Tests to be carried out . 6
6.1 General. 6
6.2 Flow sensors . 7
6.3 Temperature sensor pair . 7
6.3.1 Error in temperature difference . 7
6.3.2 Insulation resistance . 8
6.3.3 Single temperature sensor for smart metering applications . 8
6.4 Calculator . 8
6.5 Calculator and temperature sensor pair . 9
6.5.1 Heating and cooling applications . 9
6.5.2 Calculator with single temperature sensor for smart metering applications . 9
6.6 Combined thermal energy meter . 9
6.7 Complete meter . 9
6.8 Meters for heat-conveying liquids other than water . 10
6.8.1 Flow sensor . 10
6.8.2 Temperature sensor pair . 10
6.8.3 Calculator . 10
7 Documentation to be supplied . 11
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/32/EU aimed to be covered . 12
Bibliography . 13

European foreword
This document (EN 1434-5:2022) has been prepared by Technical Committee CEN/TC 176 “Thermal
energy meters”, the 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 March 2023, and conflicting national standards shall
be withdrawn at the latest by March 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
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 with EN 1434-5:2015+A1:2019, the following changes have been made:
— the third calibration temperature 𝜃𝜃 for extrapolation error of sensor pairs has been changed in
Table 1;
— new subclause 6.8 has been added.
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) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral
part of this document.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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

EN 1434-3 is maintained by CEN/TC 294.
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
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.
This document covers meters for closed systems only, where the differential pressure over the thermal
load is limited.
This document is not applicable to:
— electrical safety requirements;
— pressure safety requirements; and
— surface mounted temperature sensors.
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.
EN 1434-1:2022, Thermal energy meters — Part 1: General
EN 60751:2008, Industrial platinum resistance thermometers and platinum temperature sensors
(IEC 60751:2008)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1434-1:2022 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://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.
NOTE The provisions of this document may also apply to the re-verification of thermal energy meters under
national law.
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 document.
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 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 2.0 of November 2020, AGFW Regelwerk 204, Frankfurt, Germany.
5 Uncertainty of test equipment
Standards, 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,
...