Thermal energy meters - Part 1: General requirements

This European Standard specifies the general 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 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.

Thermische Energiemessgeräte - Teil 1: Allgemeine Anforderungen

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 (vključno z dopolnilom A1)

Ta evropski standard določa splošne 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 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
Published
Publication Date
10-Feb-2019
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
29-Jan-2019
Due Date
05-Apr-2019
Completion Date
11-Feb-2019

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Thermische Energiemessgeräte - Teil 1: Allgemeine AnforderungenCompteurs d'énergie thermique - Partie 1 : Prescriptions généralesThermal energy meters - Part 1: General requirements17.200.10Toplota. KalorimetrijaHeat. CalorimetryICS:Ta slovenski standard je istoveten z:EN 1434-1:2015+A1:2018SIST EN 1434-1:2016+A1:2019en,fr,de01-marec-2019SIST EN 1434-1:2016+A1:2019SLOVENSKI

STANDARDSIST EN 1434-1:20161DGRPHãþD
SIST EN 1434-1:2016+A1:2019
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1434-1:2015+A1
November
t r s z ICS
s yä t r rä s r English Version
Thermal energy meters æ Part
sã General requirements Compteurs d 5énergie thermique æ Partie
s ã Prescriptions générales
Wärmezähler æ Teil
sã Allgemeine Anforderungen This European Standard was approved by CEN on
w September
t r s w and includes Amendment
s approved by CEN on
s z July
t r s zä

egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä

translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels

t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN

s v u væ sã t r s w ªA sã t r s z ESIST EN 1434-1:2016+A1:2019

EN 1434-1:2015+A1:2018 (E) 2 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 !thermal energy 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 Pmin) ............................................................................................ 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 ............................................................................................................................ 17 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 .................................................................................................................................................. 18 6.10 Software ........................................................................................................................................................... 18 7 Specified working range ............................................................................................................................ 18 7.1 General ............................................................................................................................................................. 18 SIST EN 1434-1:2016+A1:2019

EN 1434-1:2015+A1:2018 (E) 3 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 !thermal energy meters" .............. 19 9.2.2 Maximum permissible relative error of sub-assemblies ............................................................... 20 9.3 Application of maximum permissible errors ..................................................................................... 20 10 Environmental classification .................................................................................................................... 21 10.1 General ............................................................................................................................................................. 21 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 !Thermal energy meter" specification ........................................................................................ 22 11.1 General ............................................................................................................................................................. 22 11.2 Flow sensor ..................................................................................................................................................... 22 11.3 Temperature sensor pair ........................................................................................................................... 23 11.4 Calculator......................................................................................................................................................... 24 11.5 Complete meters ........................................................................................................................................... 25 12 Information to be made available by the manufacturer or supplier ......................................... 27 12.1 Installation instructions ............................................................................................................................. 27 12.2 Parameter setting instructions ................................................................................................................ 28 12.3 Adjustment instructions ............................................................................................................................ 28 12.4 Maintenance instructions .......................................................................................................................... 29 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 Directive 2014/32/EU aimed to be covered ..................................................... 35 Bibliography ................................................................................................................................................................. 38

SIST EN 1434-1:2016+A1:2019

EN 1434-1:2015+A1:2018 (E) 4 European foreword This document (EN 1434-1:2015+A1:2018) 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 May 2019, and conflicting national standards shall be withdrawn at the latest by May 2019. 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 includes Amendment 1, approved by CEN on 2018-07-18. This document supersedes !EN 1434-1:2015". The start and finish of text introduced or altered by amendment is indicated in the text by tags !". 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, !Thermal energy meters" consists of the following parts: — Part 1: General requirements — Part 2: Constructional requirements — Part 3: Data exchange and interfaces1) — 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 !bifunctional thermal energy 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;

1) EN 1434-3 is maintained by CEN/TC 294.
SIST EN 1434-1:2016+A1:2019

EN 1434-1:2015+A1:2018 (E) 5 — terms and definitions, requirements for registration devices and cooling meters are added; — requirements for fast response meters are added (informative Annex C). 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 1434-1:2016+A1:2019

EN 1434-1:2015+A1:2018 (E) 6 1 Scope This European Standard specifies the general 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 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+A1:2018, Thermal energy meters — Part 2: Constructional requirements" !EN 1434-4:2015+A1:2018, Thermal energy 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 Un voltage of the external power supply required to operate the !thermal energy 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 SIST EN 1434-1:2016+A1:2019

EN 1434-1:2015+A1:2018 (E) 7 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 SIST EN 1434-1:2016+A1:2019

EN 1434-1:2015+A1:2018 (E) 8 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 !thermal energy 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+A1:2018, 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 !thermal energy meters" 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 SIST EN 1434-1:2016+A1:2019

EN 1434-1:2015+A1:2018 (E) 9 3.19 meters other than for heating 3.19.1 cooling meter !thermal energy meter" designed for cooling applications at low temperatures, normally covering the temperature range 2 °C to 30

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 hc 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 SIST EN 1434-1:2016+A1:2019

EN 1434-1:2015+A1:2018 (E) 10 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 thermal energy 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." SIST EN 1434-1:2016+A1:2019

EN 1434-1:2015+A1:2018 (E) 11 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, !thermal energy meters" are defined either as complete instruments or as combined instruments. 4.2 Complete instrument A !thermal energy meter", which does not have separable sub-assemblies as defined in 4.5. 4.3 Combined instrument A !thermal energy meter", which has separable sub-assemblies as defined in 4.5. 4.4 Hybrid instrument A !thermal energy 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 !thermal energy 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. SIST EN 1434-1:2016+A1:2019

EN 1434-1:2015+A1:2018 (E) 12 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, max, is the highest temperature of the heat conveying liquid, at which the !thermal energy meter" shall function without the maximum permissible errors being exceeded. 5.1.2 The lower limit of the temperature range, min, is the lowest temperature of the heat-conveying liquid, at which the !thermal energy meter" shall function without the maximum permissible errors being exceeded. 5.1.3 The optional switching over temperature, hc, is for switching over between heating and cooling in bifunctional meters. 5.2 Limits of temperature differences 5.2.1 , is the absolute value of the difference between the temperatures of the heat-conveying liquid at the inlet and outlet of the heat-exchange circuit. 5.2.2 max, is the highest temperature difference, at which the !thermal energy meter" shall function within the upper limit of thermal power, without the maximum permissible errors being exceeded. 5.2.3 min, is the lowest temperature difference, above which the !thermal energy meter" shall function, without the maximum permissible errors being exceeded. 5.2.4 hc for switching over between heating and cooling energy and reversed is the threshold in bifunctional meters for change-over systems between heating and cooling. 5.3 Limits of flow rate 5.3.1 The upper limit of the flow rate, qs, is the highest flow rate, at which the !thermal energy meter" shall function for short periods (<1 h / day; < 200 h / year), witho

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