prEN 1434-4

Thermal energy meters - Part 4: Pattern approval tests

This document specifies pattern approval 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 standard covers meters for closed systems only, where the differential pressure over the thermal load is limited.

Thermische Energiemessgeräte - Teil 4: Prüfungen für die Bauartzulassung

Dieses Dokument legt Prüfungen zur Bauartzulassung 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 4 : Essais en vue de l'approbation de modèle

Le présent document spécifie les essais en vue de l’approbation de modèle 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 - 4. del: Preskusi za odobritev tipa

General Information

• Status: Not Published
• 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: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Due Date: 16-Dec-2021
• Completion Date: 16-Dec-2021
• 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: oSIST prEN 1434-4:2020 - Thermal energy meters - Part 4: Pattern approval tests

RELATIONS

• Revised: EN 1434-4:2015+A1:2018 - Thermal energy meters - Part 4: Pattern approval tests
• Effective Date: 12-Jun-2019

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 1434-4:2020
01-november-2020
Merilniki toplote - 4. del: Preskusi za odobritev tipa
Thermal energy meters - Part 4: Pattern approval tests
Thermische Energiemessgeräte - Teil 4: Prüfungen für die Bauartzulassung

Compteurs d'énergie thermique - Partie 4 : Essais en vue de l'approbation de modèle

Ta slovenski standard je istoveten z: prEN 1434-4
ICS:
17.200.20 Instrumenti za merjenje Temperature-measuring
temperature instruments
oSIST prEN 1434-4:2020 en,fr,de

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

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oSIST prEN 1434-4:2020
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oSIST prEN 1434-4:2020
DRAFT
EUROPEAN STANDARD
prEN 1434-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2020
ICS 17.200.20 Will supersede EN 1434-4:2015+A1:2018
English Version
Thermal energy meters - Part 4: Pattern approval tests

Compteurs d'énergie thermique - Partie 4 : Essais en Thermische Energiemessgeräte - Teil 4: Prüfungen für

vue de l'approbation de modèle die Bauartzulassung

This 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 1434-4:2020 E

worldwide for CEN national Members.
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oSIST prEN 1434-4:2020
prEN 1434-4:2020 (E)
Contents Page

European foreword ...................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 6

2 Normative references .................................................................................................................................... 6

3 Terms and definitions ................................................................................................................................... 7

4 General................................................................................................................................................................ 7

5 Requirements ................................................................................................................................................... 7

6 Specification of operating conditions ...................................................................................................... 7

6.1 Rated operating conditions ......................................................................................................................... 7

6.2 Reference conditions ..................................................................................................................................... 8

6.3 Reference values for the measurand, RVM ............................................................................................ 8

6.3.1 General................................................................................................................................................................ 8

6.3.2 Reference values for the measurand, RVM ............................................................................................ 8

7 Tests and measurements ............................................................................................................................. 9

7.1 General................................................................................................................................................................ 9

7.2 Test programme ............................................................................................................................................ 10

7.3 Uncertainty of test equipment and influences of EUT ..................................................................... 12

7.4 Performance tests ......................................................................................................................................... 12

7.4.1 General.............................................................................................................................................................. 12

7.4.2 Flow sensor ..................................................................................................................................................... 13

7.4.3 Calculator ......................................................................................................................................................... 16

7.4.4 Temperature sensors .................................................................................................................................. 18

7.4.5 Combined sub-assemblies or complete meter ................................................................................... 20

7.5 Dry heat ............................................................................................................................................................ 20

7.5.1 General.............................................................................................................................................................. 20

7.5.2 Calculator ......................................................................................................................................................... 20

7.5.3 Flow sensor ..................................................................................................................................................... 20

7.5.4 Combined sub-assemblies or complete meter ................................................................................... 20

7.6 Cold .................................................................................................................................................................... 21

7.6.1 General.............................................................................................................................................................. 21

7.6.2 Calculator ......................................................................................................................................................... 21

7.6.3 Flow sensor ..................................................................................................................................................... 21

7.6.4 Combined sub-assemblies or complete meter ................................................................................... 21

7.7 Static deviations in supply voltage ......................................................................................................... 21

7.8 Durability test ................................................................................................................................................ 23

7.8.1 General.............................................................................................................................................................. 23

7.8.2 Flow sensor ..................................................................................................................................................... 23

7.8.3 Temperature sensors .................................................................................................................................. 27

7.8.4 Combined sub-assemblies or complete meter ................................................................................... 28

7.9 Damp heat ........................................................................................................................................................ 28

7.9.1 Damp heat cyclic ........................................................................................................................................... 28

7.9.2 Damp heat steady-state .............................................................................................................................. 29

7.10 Short time mains voltage reduction ....................................................................................................... 30

7.11 Electrical transients ..................................................................................................................................... 30

7.11.1 Fast transients (bursts) .............................................................................................................................. 30

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7.11.2 Surge transients ............................................................................................................................................ 32

7.12 Electromagnetic fields ................................................................................................................................ 33

7.12.1 Low frequency fields ................................................................................................................................... 33

7.12.2 High frequency fields .................................................................................................................................. 35

7.13 Electromagnetic field specifically caused by wireless equipment ............................................. 36

7.13.1 Electromagnetic field in distant proximity ......................................................................................... 36

7.13.2 Electromagnetic field in close proximity ............................................................................................. 37

7.14 Radio frequency amplitude modulated ................................................................................................ 37

7.15 Electrostatic discharge ............................................................................................................................... 39

7.16 Static magnetic field (fraud protection) ............................................................................................... 40

7.17 Mains frequency magnetic field .............................................................................................................. 40

7.18 Internal pressure .......................................................................................................................................... 41

7.19 Pressure loss .................................................................................................................................................. 41

7.20 Electromagnetic emission ......................................................................................................................... 41

7.20.1 General ............................................................................................................................................................. 41

7.20.2 Conducted emission on power AC lines ................................................................................................ 42

7.20.3 Conducted emission on signal and DC power lines .......................................................................... 42

7.20.4 Radiated emission ........................................................................................................................................ 42

7.21 24 h interruption in the mains power supply voltage ..................................................................... 42

7.22 Flow disturbances ........................................................................................................................................ 43

7.23 Vibration/mechanical shock .................................................................................................................... 45

8 Documentation .............................................................................................................................................. 45

Annex A (informative) Testing procedure for temperature sensor pairs with pockets and

without pockets ............................................................................................................................................. 47

A.1 Test set-up ....................................................................................................................................................... 47

A.1.1 General ............................................................................................................................................................. 47

A.1.2 Requirements of a temperature bath .................................................................................................... 47

A.2 Test sequence ................................................................................................................................................. 49

A.3 Calculations .................................................................................................................................................... 50

Annex B (informative) Checklist for type approvals of thermal energy meters according to

EN 1434 ............................................................................................................................................................ 51

Annex C (informative) Criteria for a fully developed flow profile ............................................................. 67

Annex D (informative) Asymmetric swirl generator ...................................................................................... 68

Annex ZA (informative) Relationship between this European Standard and the essential

requirements of Directive 2014/32/EU aimed to be covered ..................................................... 72

Bibliography ................................................................................................................................................................. 74

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oSIST prEN 1434-4:2020
prEN 1434-4:2020 (E)
European foreword

This document (prEN 1434-4:2020) has been prepared by Technical Committee CEN/TC 176 “Thermal

energy meters”, the secretariat of which is held by SIS.
This document is currently submitted to the CEN Enquiry.
This document supersedes EN 1434-4:2015+A1:2018.
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 1434-4:2015+A1:2018, the following changes have been made:

— addition of fluids other than water as well as electromagnetic field frequency groups and

electromagnetic field distance groups on the test programme in subclause 7.2;

— addition of performance test with fluids other than water, tapping profile test for fast response

meters and general testing of temperature sensors in subclause 7.4;

— addition of durability test for bifunctional thermal energy meters, durability test for fluids other

than water and accelerated durability test for temperature sensors in subclause 7.8;

— addition of information on supply voltage and output impedance for surge transients in subclause

7.11;

— addition of subclauses 7.12.1 “Low frequency fields” and 7.12.2 “High frequency fields”;

— addition of subclauses 7.13.1 “Electromagnetic field in distant proximity” and
7.13.2 “Electromagnetic field in close proximity”;
— addition of pressure loss with fluids other than water in subclause 7.19;
— reference for electromagnetic emission updated in subclause 7.20;

— addition of asymmetric swirl generator and performing flow disturbance test with liquids other

than water in subclause 7.22;
— checklist for type approvals is updated in Annex B;
EN 1434-3 is maintained by CEN/TC 294
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prEN 1434-4:2020 (E)
— addition of Annex D including dimensions of asymmetric swirl generator;
— Annex ZA updated.

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(s).

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

document.
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oSIST prEN 1434-4:2020
prEN 1434-4:2020 (E)
1 Scope

This document specifies pattern approval 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: General requirements

EN 60068-2-1, Environmental testing — Part 2-1: Tests — Test A: Cold (IEC 60068-2-1)

EN 60068-2-2, Environmental testing — Part 2-2: Tests — Test B: Dry heat (IEC 60068-2-2)

EN 60068-2-30:2005, Environmental testing — Part 2-30: Tests — Test Db: Damp heat, cyclic (12 h + 12 h

cycle) (IEC 60068-2-30:2005)

EN 60751:2008, Industrial platinum resistance thermometers and platinum temperature sensors

(IEC 60751:2008)

EN 61000-4-2, Electromagnetic compatibility (EMC) — Part 4-2: Testing and measurement techniques —

Electrostatic discharge immunity test (IEC 61000-4-2)

EN 61000-4-3, Electromagnetic compatibility (EMC) — Part 4-3: Testing and measurement techniques —

Radiated, radio-frequency, electromagnetic field immunity test (IEC 61000-4-3)

EN 61000-4-4, Electromagnetic compatibility (EMC) — Part 4-4: Testing and measurement techniques —

Electrical fast transient/burst immunity test (IEC 61000-4-4)

EN 61000-4-5, Electromagnetic compatibility (EMC) — Part 4-5: Testing and measurement techniques —

Surge immunity test (IEC 61000-4-5)

EN 61000-4-6:2014, Electromagnetic compatibility (EMC) — Part 4-6: Testing and measurement

techniques — Immunity to conducted disturbances, induced by radio-frequency fields

(IEC 61000-4-6:2013)

EN 61000-4-8, Electromagnetic compatibility (EMC) — Part 4-8: Testing and measurement techniques —

Power frequency magnetic field immunity test (IEC 61000-4-8)
Under development
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prEN 1434-4:2020 (E)

EN 61000-4-11, Electromagnetic compatibility (EMC) — Part 4-11: Testing and measurement techniques

— Voltage dips, short interruptions and voltage variations immunity tests (IEC 61000-4-11)

EN 61000-4-39, Electromagnetic compatibility (EMC) — Part 4-39: Testing and measurement techniques

— Radiated fields in close proximity — Immunity test (IEC 61000-4-39)

EN 61000-6-3, Electromagnetic compatibility (EMC) — Part 6-3: Generic standards — Emission standard

for residential, commercial and light-industrial environments (IEC 61000-6-3)

EN ISO 4064-2:2017, Water meters for cold potable water and hot water — Part 2: Test methods

(ISO 4064-2:2014)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in prEN 1434-1:2020 apply.

4 General

The procedure shall ascertain that the pattern conforms to the metrological requirements of this

document. In addition to the checking of the documentation (Clause 8) and the comparison of the

pattern with the metrological requirements of this European Standard, the tests in Clause 7 shall be

performed.

It is recommended to use a checklist as in Annex B to report in a standardized way the result of the

comparison between the patterns under approval with the essential requirements of this document.

5 Requirements

Under normal operating conditions, the error of thermal energy meters or their sub-assemblies shall

not exceed the maximum permissible error, MPE specified in EN 1434-1.

When thermal energy meters or their sub-assemblies are exposed to disturbances, significant faults

shall not occur.
6 Specification of operating conditions
6.1 Rated operating conditions
The rated operating conditions are those given in Table 1.
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oSIST prEN 1434-4:2020
prEN 1434-4:2020 (E)
Table 1 — Rated operating conditions
Environmental class A B C
Ambient temperature in °C +5 to +55 −25 to +55 +5 to +55
Relative humidity in % < 93
Mains supply voltage in V 195 V to 253 V
Mains frequency f ± 2 %
nom
Battery voltage The voltage of a battery in service under normal conditions
Remote AC supply voltage 12 V to 36 V
Remote DC supply voltage 12 V to 42 V
Local external DC supply voltage As specified by manufacturer
6.2 Reference conditions
Range of ambient temperature: +15 °C to +35 °C
Range of relative humidity: 25 % to 75 %
Range of ambient air pressure: 86 kPa to 106 kPa
Basic mounting orientation

The actual temperature and relative humidity within the specified range shall not vary by more

than ± 2,5 K and ± 5 percentage points respectively during the period of one measurement.

The reference conditions for a sub-assembly shall be the conditions under which it would operate if it

was a part of a combined thermal energy meter.
6.3 Reference values for the measurand, RVM
6.3.1 General

For bifunctional thermal energy meters the RVM shall be based on the values for the heating range.

6.3.2 Reference values for the measurand, RVM
Table 2 — Reference values for heating and cooling
Heating applications Cooling applications
Range of temperature (40 ± 2) K (10 ± 2) K
difference:
3 3
Range of flow rate: (0,7 to 0,75) q in m /h (0,7 to 0,75) q in m /h
p p
Outlet temperature: (50 ± 5) °C (15 ± 5) °C

The conditions, mentioned in Table 2, are reference values for a complete thermal energy meter.

Reference values for sub-assemblies are the relevant parts of the conditions mentioned in Table 2.

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oSIST prEN 1434-4:2020
prEN 1434-4:2020 (E)

Flow rate simulation for the flow sensor electronics is allowed, but testing with water is always

preferred. The temperature of the liquid in the flow sensor shall be kept at (50 ± 5) °C or at ambient

temperature. The power and signal wires shall be connected. The flow sensor including flow sensor

electronics shall be operated at zero flow rate (without low flow cut off device).

7 Tests and measurements
7.1 General

Unless otherwise stated in the test specification, the test requirements apply irrespective of the thermal

energy meter's environmental class. See prEN 1434-1:2020, Clause 10.

All measurements shall be carried out under the installation conditions stipulated by the manufacturer

for his type of meter (e.g. straight sections of piping upstream and downstream of the meter). For all

tests the heat conveying liquid shall be water, unless otherwise specified. The performance test shall be

carried out with the specified liquid and the type approval certificate shall include the specification of

the liquid to be used for initial verification.

If a temperature sensor can be installed in the flow sensor, this shall be done during the performance

tests of the flow sensor. Where a filter or strainer is an integral part of the flow sensor, it shall be

included at all tests.

If the error determined lies outside the MPE, the test shall be repeated twice unless otherwise stated.

The test is satisfactory declared 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.

Depending on the flow sensor size the tests and measurements to be carried out are described below:

For each meter model the test in 7.4, 7.18 and 7.19 can be carried out on a limited number of sizes

according to an evaluation by the testing laboratory. This evaluation shall be included in the type

testing report.

The test in 7.8 shall be carried out only for those sizes of a type for which the highest wear is expected.

For dimensions > DN 200, 7.19 shall be carried out at θ
min

For each meter model the following tests shall be carried out on one size only: 7.5, 7.6, 7.7, 7.9, 7.10,

7.11, 7.12, 7.13, 7.14, 7.15, 7.16, 7.17, 7.20, 7.21 and 7.23.
Tests of additional energy registers for smart metering functionalities:

The accuracy of thermal energy accumulation into the additionally and independently energy registers

shall be tested by energy performance tests according to 7.4.

NOTE In applications of smart metering, one or both single sensors of the pair are used as additional single

sensor.

Additional tests for control quantities, the internal clock, external digital signal, single temperature

sensors, calculators and calculators with single sensors shall be done according to requirements in

prEN 1434-1:2020, 5.10. It shall be tested that the specific MPE according to prEN 1434-1:2020, 5.10.5

for tolerance quantities, used for threshold activation of additional energy accumulations will be met.

The absence of software-interaction between all energy registers shall be proved in accordance with the

WELMEC Guide “7.2 Software”, respective latest edition. This shall be done for both directions of energy

flow, in cases of delivered and absorbed energy (heat and cooling meter).

Each additional register under test shall be activated by the corresponding control quantity. It shall be

ascertained that the specific activated register content on display is corresponding to the changes of

control quantity, as expected and by at least one totalizer energy increment.
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prEN 1434-4:2020 (E)

By metrological tests the accuracy of generating and processing, the accumulated energy values in

dependency on the parameterisation of the corresponding control parameters shall be tested. By

checking of the switch-on/off parameters, it shall be ascertained that the control quantity and the

values thereof are indicated on display properly. The information on the display shall not deviate from

the real measurement with respect to measurement conditions.
7.2 Test programme

Samples of a thermal energy meter, or its sub-assemblies, submitted for pattern approval, shall be

subject to tests to verify their conformity with Clause 4. Unless otherwise stated, the tests shall be

carried out at reference conditions and the samples shall be exposed to the influence factors or

disturbances specified for the respective tests, as stated in Table 3.

Meters for the use with heat-conveying liquids other than water have to perform the following tests

with liquids other than water:

— Performance test (7.4); the test shall be performed with the specified liquid and concentration. For

meters for multiple specified liquids and/or multiple specified concentrations the manufacturer

shall prove (preferably by experiment which may be supported by calculation and simulation) that

the meter is capable to adapt to the physical properties of the liquid. The number of tests can then

be reduced by sample testing e.g. for some of the specified liquids and/or specified concentrations.

Minimum is one fluid for each liquid category.
— Flow disturbance test (7.22); the effect of flow di
...