Thermal energy meters - Part 2: Constructional requirements

This document is applicable to the constructional requirements 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 2: Anforderungen an die Konstruktion

Dieses Dokument ist auf die Konstruktionsanforderungen für thermische Energiemessgeräte anwendbar. 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 2 : Prescriptions de fabrication

Le présent document est applicable aux prescriptions de fabrication relatives aux 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 - 2. del: Konstrukcijske zahteve

Ta dokument določa konstrukcijske zahteve za merilnike 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.

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Standards Content (Sample)

SIST EN 1434-2:2016+A1:2019
Merilniki toplote - 2. del: Konstrukcijske zahteve
Thermal energy meters - Part 2: Constructional requirements
Thermische Energiemessgeräte - Teil 2: Anforderungen an die Konstruktion
Compteurs d'énergie thermique - Partie 2 : Prescriptions de fabrication
Ta slovenski standard je istoveten z: EN 1434-2:2022
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 1434-2
September 2022
ICS 17.200.20 Supersedes EN 1434-2:2015+A1:2018
English Version
Thermal energy meters - Part 2: Constructional
Compteurs d'énergie thermique - Partie 2 : Thermische Energiemessgeräte - Teil 2:
Prescriptions de fabrication Anforderungen an die Konstruktion
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
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.


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 1434-2:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Temperature sensors . 7
4.1 General. 7
4.2 Mechanical design . 7
4.2.1 General. 7
4.2.2 Materials of temperature probe sheath and pocket . 7
4.2.3 Dimensions of direct mounted short probes - Type DS . 8
4.2.4 Dimensions of direct mounted long probes - Type DL . 8
4.2.5 Dimensions of pocket mounted long probes - Type PL . 9
4.2.6 Dimensions of temperature pocket. 10
4.2.7 Design of short probes with respect to installation . 11
4.2.8 Design of long probes with respect to installation . 12
4.3 Platinum temperature sensor . 12
4.3.1 Specialized definitions for 2 wire temperature probes . 12
4.3.2 Resistance characteristics . 13
4.3.3 Signal leads . 13
4.3.4 Temperature sensors for the 2-wire method . 14
4.3.5 Temperature sensors for the 4-wire method . 14
4.3.6 Thermal response time . 14
4.3.7 Qualifying immersion depth of a temperature sensor . 14
4.4 Other temperature sensors . 14
5 Flow sensors . 15
5.1 Maximum admissible working pressure, PS in bar . 15
5.2 Sizes and dimensions . 15
5.3 Test signal output . 16
5.4 Adjusting device . 17
6 Calculators . 17
6.1 Terminals - specification and identification . 17
6.1.1 General. 17
6.1.2 Terminals for signal leads . 17
6.1.3 Terminals for connection to the mains supply . 19
6.2 Batteries . 19
6.3 Dynamic behaviour . 19
6.4 Test signal output . 19
6.5 24 h interruption in supply voltage . 20
7 Complete meter . 20
8 Interfaces between sub-assemblies . 21
8.1 General. 21
8.2 Definitions for pulse device interfaces . 21
8.2.1 General. 21
8.2.2 Electrical connection . 21
8.2.3 Classification of pulse output devices . 21
8.2.4 Timing and electrical parameters for pulse output devices (other than test signals) . 22
8.2.5 Classification of pulse input devices . 22
8.2.6 Timing and electrical parameter for pulse input devices . 23
8.2.7 Compatibility . 23
9 Marking and security seals . 24
9.1 Marking . 24
9.1.1 General . 24
9.1.2 Temperature sensor pairs . 24
9.1.3 Pockets . 24
9.1.4 Flow sensor . 24
9.1.5 Calculator . 25
9.1.6 Complete meter . 25
9.2 Sites for marking . 26
9.3 Security seals . 26
Annex A (informative) Examples of temperature sensors . 27
Annex B (normative) Input and output test signals . 39
Annex C (informative) Low voltage power supply for the thermal energy meters and their
subassemblies . 42
C.1 Remote supply . 42
C.1.1 Voltage (DC or AC) . 42
C.1.2 Current available . 42
C.1.3 Cabling requirements . 42
C.2 Local external DC supply . 42
C.2.1 Voltage . 42
C.2.2 Other data . 42
C.3 Power supply specifications . 43
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive2014/32/EU aimed to be covered . 44
Bibliography . 45

European foreword
This document (EN 1434-2:2022) 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.
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