Heat meters - Part 1: General requirements

This European Standard specifies the general requirements and applies to 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 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 Standard.
Pressure safety requirements are not covered by this European Standard.
Surface mounted temperature sensors are not covered by this European Standard.
This standard covers meters for closed systems only, where the differential pressure over the thermal load is limited.

Wärmezähler - Teil 1: Allgemeine Anforderungen

Diese Europäische Norm legt die allgemeinen Anforderungen für Wärmezähler fest. Wärmezähler sind Geräte, die dazu dienen, die Energiemenge zu messen, die in einem Wärmetauscherkreislauf durch eine als Wärmeträgerflüssigkeit bezeichnete Flüssigkeit aufgenommen (Kühlen) oder abgegeben (Heizen) wird. Der Wärmezähler zeigt die Wärmemenge in gesetzlichen Einheiten an.
Elektrische Sicherheitsanforderungen werden in dieser Europäischen Norm nicht behandelt.
Den Druck betreffende Sicherheitsanforderungen werden in dieser Europäischen Norm nicht behandelt.
Oberflächenmontierte Temperaturfühler werden in dieser Europäischen Norm nicht behandelt.
Die vorliegende Norm behandelt ausschließlich Zähler für geschlossene Systeme, in denen der Differenzdruck am Wärmeübertrager begrenzt ist.

Compteurs d'énergie thermique - Partie 1: Prescriptions générales

La présente Norme européenne spécifie les prescriptions générales 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.
La présente Norme européenne ne traite pas des prescriptions de sécurité électrique.
La présente Norme européenne ne traite pas des prescriptions de sécurité relative à la pression.
La présente Norme européenne ne traite pas des sondes de température montées en surface.
La présente norme couvre les compteurs pour les systèmes fermés uniquement, où la pression différentielle dans la charge thermique est limitée.

Merilniki toplote - 1. del: Splošne zahteve

Ta evropski standard določa splošne zahteve in se uporablja za toplotne števce, tj. instrumente, ki so namenjeni za merjenje toplote, ki jo v krogotoku toplotne izmenjave absorbira (hlajenje) ali oddaja (ogrevanje) tekočina, imenovana tekočina za prenos toplote. Toplotni števec podaja toploto v predpisanih enotah. Ta evropski standard ne zajema električnih varnostnih zahtev. Ta evropski standard ne zajema tlačnih varnostnih zahtev. Ta evropski standard ne zajema površinsko nameščenih senzorjev temperature. Ta standard zajema samo števce za zaprte sisteme, kjer je diferencialni tlak nad toplotno obremenitvijo omejen.

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Standards Content (Sample)

SIST EN 1434-1:2007
Merilniki toplote - 1. del: Splošne zahteve
Heat meters - Part 1: General requirements
Wärmezähler - Teil 1: Allgemeine Anforderungen
Comteurs d´engine thermique - Partie 1: Prescriptions générales
Ta slovenski standard je istoveten z: EN 1434-1:2015
17.200.10 Toplota. Kalorimetrija Heat. Calorimetry
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 1434-1
November 2015
ICS 17.200.10 Supersedes EN 1434-1:2007
English Version
Heat meters - Part 1: General requirements
Compteurs d'énergie thermique - Partie 1: Wärmezähler - Teil 1: Allgemeine Anforderungen
Prescriptions générales
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 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.


CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1434-1:2015 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Types of instruments . 11
4.1 General . 11
4.2 Complete instrument . 11
4.3 Combined instrument . 11
4.4 Hybrid instrument . 11
4.5 Sub-assemblies of a heat meter, which is a combined instrument . 11
4.5.1 General . 11
4.5.2 Flow sensor . 12
4.5.3 Temperature sensor pair . 12
4.5.4 Calculator . 12
4.6 Equipment under test (EUT) . 12
5 Rated operating conditions . 12
5.1 Limits of temperature range . 12
5.2 Limits of temperature differences . 12
5.3 Limits of flow rate . 12
5.4 Limit of thermal power . 13
5.5 Limits of working pressure (PS and P ) . 13
5.6 Nominal pressure (PN) . 13
5.7 Limits in ambient temperature . 13
5.8 Limits in deviations in supply voltage . 13
5.9 Maximum pressure loss . 13
5.10 Specific requirements on registration devices . 13
5.10.1 General . 13
5.10.2 Suitability . 13
5.10.3 Rated operated conditions . 14
5.10.4 Indication . 14
5.10.5 MPE . 15
6 Technical characteristics . 15
6.1 Materials and construction . 15
6.2 Requirements outside the limiting values of the flow rate . 16
6.3 Display . 16
6.4 Protection against fraud . 16
6.5 Supply voltage . 17
6.6 Qualifying immersion depth of a temperature sensor . 17
6.7 The influence on a temperature sensor pair caused by mounting in pockets . 17
6.8 Reproducibility . 17
6.9 Repeatability . 17
6.10 Software . 18
7 Specified working range . 18
7.1 General . 18
7.2 Temperature difference . 18
7.3 Flow rate . 18
8 Heat transmission formula . 18
9 Metrological characteristics (Maximum Permissible Error, MPE) . 19
9.1 General . 19
9.2 Values of maximum permissible errors . 19
9.2.1 Maximum permissible relative errors of complete heat meters . 19
9.2.2 Maximum permissible relative error of sub-assemblies . 19
9.3 Application of maximum permissible errors . 20
10 Environmental classification . 20
10.1 General . 20
10.2 Environmental class A (Domestic use, indoor installations) . 21
10.3 Environmental class B (Domestic use, outdoor installations) . 21
10.4 Environmental class C (Industrial installations) . 21
10.5 Mechanical classes M1 to M3 . 21
11 Heat meter specification . 21
11.1 General . 21
11.2 Flow sensor . 21
11.3 Temperature sensor pair . 23
11.4 Calculator. 23
11.5 Complete meters . 25
12 Information to be made available by the manufacturer or supplier . 26
12.1 Installation instructions . 26
12.2 Parameter setting instructions . 27
12.3 Adjustment instructions . 28
12.4 Maintenance instructions . 28

12.5 Hints for disposal instructions . 29
Annex A (normative) Heat coefficient equations . 30
Annex B (normative) Flow conditioner package . 32
Annex C (normative) Fast response meters . 34
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2004/22/EC, MID . 35
Bibliography . 37

European foreword
This document (EN 1434-1:2015) has been prepared by Technical Committee CEN/TC 176 “Heat
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 May 2016, and conflicting national standard

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