Heat meters - Part 1: General requirements

This European Standard specifies the general requirements and applies to heat meters, that is to 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 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.

Comteurs d´engine 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.

General Information

Status
Withdrawn
Public Enquiry End Date
08-May-2014
Publication Date
06-Dec-2015
Withdrawal Date
10-Feb-2019
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
30-Jan-2019
Due Date
22-Feb-2019
Completion Date
11-Feb-2019

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SLOVENSKI STANDARD
SIST EN 1434-1:2016
01-januar-2016
1DGRPHãþD
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
ICS:
17.200.10 Toplota. Kalorimetrija Heat. Calorimetry
SIST EN 1434-1:2016 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 1434-1:2016
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SIST EN 1434-1:2016
EN 1434-1
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2015
EUROPÄISCHE NORM
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

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, 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
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.
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SIST EN 1434-1:2016
EN 1434-1:2015 (E)
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

min

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

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SIST EN 1434-1:2016
EN 1434-1:2015 (E)

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

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SIST EN 1434-1:2016
EN 1434-1:2015 (E)
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 standards shall be

withdrawn at the latest by May 2016.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent

rights.
This document supersedes EN 1434-1:2007.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association, and supports essential requirements of EU Directive.

For relationship with EU Directive, see informative Annex ZA, which is an integral part of this

document.
EN 1434, Heat 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 1434-1:2007, the following changes have been made:
— special cases for combined cooling and heating meters are added;
— additional functionality for smart metering applications are added;
— metrological requirements for smart metering applications are added;
— definitions and requirements for the cooling meter are added;
— tariff meters are added;

— terms and definitions, requirements for registration devices and cooling meters are added;

— requirements for fast response meters are added (informative Annex C).
EN 1434-3 is maintained by CEN/TC 294.
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SIST EN 1434-1:2016
EN 1434-1:2015 (E)

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: 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 the United Kingdom.
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SIST EN 1434-1:2016
EN 1434-1:2015 (E)
1 Scope

This European Standard specifies the general requirements for 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.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

EN 1434-2:2015, Heat meters — Part 2: Constructional requirements
EN 1434-4:2015, Heat meters — Part 4: Pattern approval test

EN 60751, Industrial platinum resistance thermometers and platinum temperature sensors (IEC 60751)

EN 61010-1, Safety requirements for electrical equipment for measurement, control and laboratory use —

Part 1: General requirements (IEC 61010-1)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
response time
0,5

time interval between the instant when flow or temperature difference is subjected to a specified

abrupt change and the instant when the response reaches 50 % of the step value
3.2
fast response meter

meter suitable for heat exchanging circuits with rapid dynamic variations in the exchanged heat

Note 1 to entry: See also Annex C.
3.3
rated voltage

voltage of the external power supply required to operate the heat meter, conventionally the voltage of

the AC mains supply
3.4
rated operating conditions

conditions of use, giving the range of values of influence quantities, for which the metrological

characteristics of the instrument are within the specified maximum permissible errors

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EN 1434-1:2015 (E)
3.5
reference conditions

set of specified values of influence factors, fixed to ensure valid inter-comparison of results of

measurements
3.6
influence quantity

quantity, which is not the subject of the measurement, but which influences the value of the

measurement and or the indication of the measuring instrument
3.7
influence factors
influence quantity having a value within the rated operating conditions
3.8
disturbance
influence quantity having a value outside the rated operating conditions
3.9
Types of errors
3.9.1
error (of indication)

indication of the measuring instrument minus the conventional true value of the measurand

3.9.2
intrinsic error
error of a measuring instrument determined under reference conditions
3.9.3
initial intrinsic error

error of a measuring instrument as determined once prior to performance tests and durability tests

3.9.4
durability error

difference between the intrinsic error after a period of use and the initial intrinsic error

3.9.5
maximum permissible error
MPE
highest values of the error (positive or negative) permitted
3.10
Types of faults
3.10.1
fault

difference between the error of indication and the intrinsic error of the instrument

3.10.2
transitory fault

momentary variations in the indication, which cannot be interpreted, memorized or transmitted as

measurements
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SIST EN 1434-1:2016
EN 1434-1:2015 (E)
3.10.3
significant fault

fault greater than the absolute value of the MPE and not being a transitory fault

Note 1 to entry: If the MPE is ± 2 % then the significant fault is a fault larger than ± 2 %.

3.11
reference values of the measurand
RVM

specified value of the flow rate, the outlet temperature and the temperature difference, fixed to ensure

valid intercomparison of the results of measurements
3.12
conventional true value
quantity value attributed by agreement to a quantity for a given purpose

Note 1 to entry: A conventional true value is, in general, regarded as sufficiently close to the true value for the

difference to be insignificant for the given purpose.
EXAMPLE A true value is the heat coefficient according to Annex A.
3.13
meter model

different sizes of heat meters or sub-assemblies having a family similarity in the principles of operation,

construction and materials
3.14
electronic device
device employing electronic elements and performing a specific function
3.15
electronic element

smallest physical entity in an electronic device which uses electron hole conduction in semi-conductors,

or electron conduction in gases or in a vacuum
3.16
qualifying immersion depth of a temperature sensor

immersion depth over which the sensor measures with an accurate temperature value

Note 1 to entry: The conditions to define the qualified immersion depth are written in EN 1434-4:2015, 7.4.4.1.

3.17
self-heating effect

increase in temperature signal that is obtained by subjecting each temperature sensor of a pair to a

continuous power dissipation of 5 mW when immersed to the qualifying immersion depth in a water

bath, having a mean water velocity of 0,1 m/s
3.18
heat meter

instrument 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
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SIST EN 1434-1:2016
EN 1434-1:2015 (E)
3.19
meters other than for heating
3.19.1
cooling meter

heat meter designed for cooling applications at low temperatures, normally covering the temperature

range 2 °C to 30 °C and ΔΘ up to 20 K
3.19.2
bifunctional meters for change-over systems between heating and cooling
instrument measuring heating and cooling energy in two separate registers

Note 1 to entry: In other directives and requirements, bifunctional meters are called combined meters.

Key
No energy recording
Heating
Cooling
Figure 1 — Example for function of heating and cooling register
3.20
flow direction
direction of the liquid going through the system from inlet to outlet

Note 1 to entry: The inlet is for the heating case the hot side and for the cooling case the cold side.

Note 2 to entry: In the literature the word “flow” is also being used for “inlet”, and the word “return” is also

being used for “outlet”.

Note 3 to entry: Different temperature values for θ for heating and cooling applications may also occur.

3.21
electrical pulse

electrical signal (voltage, current or change in resistance), that departs from an initial level for a limited

duration of time and ultimately returns to the original level
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SIST EN 1434-1:2016
EN 1434-1:2015 (E)
3.22
pulse output and input devices
3.22.1
pulse output device
functional part of flow sensor, calculator or auxiliary devices
EXAMPLE Remote displays or input devices of control systems.
3.22.2
pulse input device
functional part of flow sensor, calculator or auxiliary devices
EXAMPLE Remote displays or input devices of control systems.
3.23
maximum admissible temperature

maximum temperature of the heat conveying liquid the meter can withstand in combination with the

maximum admissible working pressure and the permanent flow rate for short periods of time (< 1 h /

day; < 200 h / year) without a significant fault after the exposure to this maximum admissible

temperature
3.24
durability

characteristic of a measuring instrument to keep the metrological characteristics over time (e.g. to fulfil

the double of MPE), provided that it is properly installed, maintained and used within the permissible

environmental conditions
3.25
long life flow sensor

flow sensor designed to have a longer lifetime than a normal flow sensor, which typically has a

durability of 5 years under the specified operating conditions
3.26
user interface

interface forming part of the instrument that enables information to be passed between a human user

and the measuring instrument or its components (e.g. display)
3.27
communication interface

electronic, optical, radio or other technical interface that enables information via correct transceiving of

at least thermal energy to be passed between measuring instruments, sub-assemblies or external

devices
3.28
meter for smart metering

heat meter or cooling meter with the capability of data communication and support of smart metering

functionalities

Note 1 to entry: Data could be transmitted via user interface and/ or communication interface in fixed time

intervals and/or on request.

Note 2 to entry: For more information on smart meters, see standard series EN 13757 and

CEN/CLC/ETSI/TR 50572.
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SIST EN 1434-1:2016
EN 1434-1:2015 (E)
3.29
registration device

an optional additional device fitted to the meter as an integral part or separate device, in order to

register the amount of thermal energy accumulated in additional registers during periods, depending

on conditions, e. g. flow rate, inlet or outlet temperatures, temperature differences or time points

3.30
register

component of a registration device which contains accumulated or actual values e. g. thermal energy,

volume, maximum flow rate, power or temperature
3.31
interval register

register which contains frequently accumulated or copied values used for registration of billing

purposes and/ or for controlling processes

Note 1 to entry: During consecutive time intervals values could be achieved by copying from an accumulating

main register which contains actual values of e.g. thermal energy or volume.

Note 2 to entry: During consecutive time intervals the measured process values of flow rate and/or

temperature could be additionally stored.
3.32
maximum flow
highest rate of flow which is expected at operating conditions
Note 1 to entry: For the limits of flow rates, see 5.3.
4 Types of instruments
4.1 General

For the purposes of this European Standard, heat meters are defined either as complete instruments or

as combined instruments.
4.2 Complete instrument
A heat meter, which does not have separable sub-assemblies as defined in 4.5.
4.3 Combined instrument
A heat meter, which has separable sub-assemblies as defined in 4.5.
4.4 Hybrid instrument

A heat meter, which for the purpose of pattern approval and verification can be treated as a combined

instrument as defined in 4.3 or combinations between sub-assemblies. However, after verification, its

sub-assemblies shall be treated as inseparable.
NOTE Hybrid instruments are often called “compact instruments”.
4.5 Sub-assemblies of a heat meter, which is a combined instrument
4.5.1 General

The flow sensor, the temperature sensor pair and the calculator or a combination of these.

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SIST EN 1434-1:2016
EN 1434-1:2015 (E)
4.5.2 Flow sensor

A sub-assembly through which the heat-conveying liquid flows, at either the inlet or outlet of a heat-

exchange circuit, and which emits a signal, which is a function of the volume or the mass or the

volumetric or mass flow rate.
4.5.3 Temperature sensor pair

A sub-assembly (for mounting with or without pockets), which senses the temperatures of the heat-

conveying liquid at the inlet and outlet of a heat-exchange circuit.
4.5.4 Calculator

A sub-assembly, which receives signals from the flow sensor, and the temperature sensors and

calculates and indicates the quantity of heat exchanged.
4.6 Equipment under test (EUT)
A sub-assembly, a combined sub-assembly or a complete meter subject to a test.
5 Rated operating conditions
5.1 Limits of temperature range

5.1.1 The upper limit of the temperature range, θ , is the highest temperature of the heat conveying

max

liquid, at which the heat meter shall function without the maximum permissible errors being exceeded.

5.1.2 The lower limit of the temperature range, θ , is the lowest temperature of the heat-conveying

min

liquid, at which the heat meter shall function without the maximum permissible errors being exceeded.

5.1.3 The optional switching over temperature, θ , is for switching over between heating and cooling

in bifunctional meters.
5.2 Limits of temperature differences
...

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