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 or given up 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.

Wärmezähler - Teil 1: Allgemeine Anforderungen

Diese Europäische Norm gilt für Wärmezähler, d. h. für Geräte, die dazu dienen, die Wärmemenge zu
messen, die in einem Wärmetauscherkreislauf durch eine als Wärmeträgerflüssigkeit bezeichnete Flüssigkeit
aufgenommen oder abgegeben wird. Der Wärmezähler zeigt die Wärmemenge in gesetzlichen Einheiten an.
Elektrische Sicherheitsanforderungen werden in dieser Norm nicht behandelt.
Den Druck betreffende Sicherheitsanforderungen werden in dieser Norm nicht behandelt.
Oberflächenmontierte Sensoren werden in dieser Norm nicht behandelt.
Teil 1 beschreibt allgemeine Anforderungen.

Compteurs d'énergie thermique - Partie 1: Prescriptions générales

La présente Norme européenne spécifie les prescriptions générales et s'applique aux compteurs d'énergie thermique, c'est-à-dire aux instruments destinés à mesurer l'énergie thermique qui, dans un circuit d'échange thermique, est absorbée (refroidissement) ou cédée (échauffement) 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 exigences de sécurité électrique.
La présente Norme européenne ne traite pas des exigences de sécurité relatives à la pression.
La présente Norme européenne ne traite pas des sondes de température montées en surface.

Toplotni števci - 1. del: Splošne zahteve

General Information

Status
Withdrawn
Publication Date
10-Apr-2007
Withdrawal Date
24-Nov-2015
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
25-Nov-2015
Due Date
18-Dec-2015
Completion Date
25-Nov-2015

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EN 1434-1:2007
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Heat meters - Part 1: General requirementsToplotni števci - 1. del: Splošne zahteveCompteurs d'énergie thermique - Partie 1: Prescriptions généralesWärmezähler - Teil 1: Allgemeine AnforderungenTa slovenski standard je istoveten z:EN 1434-1:2007SIST EN 1434-1:2007en17.200.10Toplota. KalorimetrijaHeat. CalorimetryICS:SIST EN 1434-1:1997/A1:2002SIST EN 1434-1:19971DGRPHãþDSLOVENSKI
STANDARDSIST EN 1434-1:200701-maj-2007







EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1434-1February 2007ICS 17.200.10Supersedes EN 1434-1:1997
English VersionHeat meters - Part 1: General requirementsCompteurs d'énergie thermique - Partie 1: PrescriptionsgénéralesWärmezähler - Teil 1: Allgemeine AnforderungenThis European Standard was approved by CEN on 7 January 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1434-1:2007: E



EN 1434-1:2007 (E) 2 Contents Page Foreword.4 1 Scope.5 2 Normative references.5 3 Types of instrument.5 3.1 General.5 3.2 Complete instrument.5 3.3 Combined instrument.5 3.4 Hybrid instrument (often called a "compact" instrument).5 3.5 Sub-assemblies of a heat meter, which is a combined instrument.5 3.5.1 General.5 3.5.2 Flow sensor.6 3.5.3 Temperature sensor pair.6 3.5.4 Calculator.6 3.6 Equipment under test (EUT).6 4 Terms, definitions and symbols.6 5 Rated operating conditions.9 5.1 Limits of temperature range.9 5.2 Limits of temperature differences.9 5.3 Limits of flow-rate.9 5.4 Limit of thermal power.9 5.5 Maximum admissible working pressure; PS.9 5.6 Nominal pressure; PN.10 5.7 Limits in ambient temperature.10 5.8 Limits in deviations in supply voltage.10 5.9 Maximum pressure loss.10 6 Technical characteristics.10 6.1 Materials and construction.10 6.2 Requirements outside the limiting values of the flow rate.10 6.3 Display.11 6.4 Protection against fraud.11 6.5 Supply voltage.11 6.6 Qualifying immersion depth of a temperature sensor.12 6.7 The influence on a temperature sensor pair caused by mounting in pockets.12 6.8 Reproducibility.12 6.9 Repeatability.12 6.10 Software.12 7 Specified working range.13 7.1 General.13 7.2 Temperature difference.13 7.3 Flow rate.13 8 Heat transmission formula.13 9 Metrological characteristics (Maximum Permissible Error, MPE).14 9.1 General.14 9.2 Values of maximum permissible errors.14 9.2.1 Maximum permissible relative errors of complete heat meters.14 9.2.2 Maximum permissible relative error of sub-assemblies.15 9.3 Application of maximum permissible errors.15



EN 1434-1:2007 (E) 3 10 Environmental classification.15 10.1 General.15 10.2 Environmental class A (Domestic use, indoor installations).15 10.3 Environmental class B (Domestic use, outdoor installations).16 10.4 Environmental class C (Industrial installations).16 11 Heat meter specification.16 11.1 General.16 11.2 Flow sensor.16 11.3 Temperature sensor pair.17 11.4 Calculator.18 11.5 Complete meters.19 12 Information to be delivered with the meter or sub-assemblies.20 Annex A (normative)
Heat coefficient equations.22 Annex B (normative)
Flow conditioner package.24 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 2004/22/EC, MID.26 Bibliography.27



EN 1434-1:2007 (E) 4 Foreword This document (EN 1434-1:2007) has been prepared by Technical Committee CEN/TC 176 “Heat meters”, the secretariat of which is held by DS. 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 August 2007, and conflicting national standards shall be withdrawn at the latest by August 2007. This document supersedes EN 1434-1:1997. The other parts are: 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 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.



EN 1434-1:2007 (E) 5 1 Scope 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. 2 Normative references The following referenced documents are indispensable for the application 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. EN 60751, Industrial platinum resistance thermometer sensors (IEC 60751:1983 + A1:1986) EN 61010-1, Safety requirements for electrical equipment for measurement, control and laboratory use — Part 1: General requirements (IEC 61010-1:2001) 3 Types of instrument 3.1 General For the purposes of this European Standard, heat meters are defined either as complete instruments or as combined instruments. 3.2 Complete instrument A heat meter, which does not have separable sub-assemblies as defined in 3.5. 3.3 Combined instrument A heat meter, which has separable sub-assemblies as defined in 3.5. 3.4 Hybrid instrument (often called a "compact" instrument) A heat meter, which for the purpose of pattern approval and verification can be treated as a combined instrument as defined in 3.3. However, after verification, its sub-assemblies shall be treated as inseparable. 3.5 Sub-assemblies of a heat meter, which is a combined instrument 3.5.1 General The flow sensor, the temperature sensor pair and the calculator or a combination of these.



EN 1434-1:2007 (E) 6 3.5.2 Flow sensor A sub-assembly through which the heat-conveying liquid flows, at either the flow or return 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. 3.5.3 Temperature sensor pair A sub-assembly (for mounting with or without pockets), which senses the temperatures of the heat-conveying liquid at the flow and return of a heat-exchange circuit. 3.5.4 Calculator A sub-assembly, which receives signals from the flow sensor, and the temperature sensors and calculates and indicates the quantity of heat exchanged. 3.6 Equipment under test (EUT) A sub-assembly, a combined sub-assembly or a complete meter subject to a test. 4 Terms, definitions and symbols For the purposes of this document, the following terms, definitions and symbols apply. 4.1 response time ττττ0,5 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 4.2 fast response meter meter suitable for heat exchanging circuits with rapid dynamic variations in the exchanged heat 4.3 rated voltage Un voltage of the external power supply required to operate the heat meter, conventionally the voltage of the AC mains supply 4.4 rated operating conditions conditions of use, giving the range of values of influence quantities, for which the metrological characteris-tics of the instrument are within the specified maximum permissible errors 4.5 reference conditions set of specified values of influence factors, fixed to ensure valid inter-comparison of results of measure-ments 4.6 influence quantity quantity, which is not the subject of the measurement, but which influences the value of the measurand or the indication of the measuring instrument 4.7 influence factors influence quantity having a value within the rated operating conditions



EN 1434-1:2007 (E) 7 4.8 disturbance influence quantity having a value outside the rated operating conditions 4.9 types of error 4.9.1 error (of indication) indication of the measuring instrument minus the conventional true value of the measurand 4.9.2 intrinsic error error of a measuring instrument determined under reference conditions 4.9.3 initial intrinsic error error of a measuring instrument as determined once prior to performance tests and durability tests 4.9.4 durability error difference between the intrinsic error after a period of use and the initial intrinsic error 4.9.5 maximum permissible error; MPE extreme values of the error (positive or negative) permitted 4.10 types of fault 4.10.1 fault difference between the error of indication and the intrinsic error of the instrument 4.10.2 transitory fault momentary variations in the indication, which cannot be interpreted, memorized or transmitted as measure-ments 4.10.3 significant fault fault greater than the absolute value of the MPE and not being a transitory fault NOTE If the MPE is ± 2 % then the significant fault is a fault larger than 2 %. 4.11 reference values of the measurand; RVM specified value of the flow-rate, the return temperature and the temperature difference, fixed to ensure valid intercomparison of the results of measurements 4.12 conventional true value value of a quantity, which for the purpose of this European Standard is considered as the true value NOTE 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.



EN 1434-1:2007 (E) 8 4.13 meter model different sizes of heat meters or sub-assemblies having a family similarity in the principles of operation, construction and materials 4.14 electronic device device employing electronic elements and performing a specific function 4.15 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 4.16 qualifying immersion depth of a temperature sensor immersion depth over which the sensor is considered stable enough for the purpose of this European Standard 4.17 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 4.18 meters other than for heating 4.18.1 cooling meter heat meter designed for cooling applications at low temperatures, normally covering the temperature range
2 ºC to 30 ºC and ∆Θ up to 20 K 4.18.1 meters for heating and cooling instrument measuring heating and cooling energy in two separate registers 4.19 flow direction is described by the terms flow and return. Flow meaning the forward direction to the system and return meaning output from the system. (Flow/return means high/low temperature for a heat meter but low/high temperature for a cooling meter) 4.20 electrical pulse electrical signal (voltage, current or resistance), that departs from an initial level for a limited duration of time and ultimately returns to the original level 4.21 pulse output and input device two types of pulse devices are defined and specified: a)
the pulse output device; b)
the pulse input device. Both devices are functional parts of flow sensor, calculator or auxiliary devices such as remote displays or input devices of control systems



EN 1434-1:2007 (E) 9 4.22 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 (< 200 h in the total life time of the unit) without a significant fault after the exposure to this maximum admissible temperature 4.23 Long life flow sensor flow sensor designed to have a longer lifetime that a normal flow sensor, which typically lasts for 5 years 5 Rated operating conditions 5.1 Limits of temperature range 5.1.1 The upper limit of the temperature range, Θmax, is the highest temperature of the heat conveying 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, Θmin, is the lowest temperature of the heat-conveying liquid, at which the heat meter shall function without the maximum permissible errors being exceeded. 5.2 Limits of temperature differences 5.2.1 The temperature difference, ∆Θ, is the absolute value of the difference between the temperatures of the heat-conveying liquid at the flow and return of the heat-exchange circuit. 5.2.2 The upper limit of the temperature difference, ∆Θmax, is the highest temperature difference, at which the heat meter shall function within the upper limit of thermal power, without the maximum permissible errors being exceeded. 5.2.3 The lower limit of the temperature difference, ∆Θmin, is the lowest temperature difference, above which the heat meter shall function, without the maximum permissible errors being exceeded. 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 heat meter shall function for short periods (< 1h / day; < 200 h / year), without the maximum permissible errors being exceeded. 5.3.2 The permanent flow-rate, qp, is the highest flow-rate, at which the heat meter shall function continuously without the maximum permissible errors being exceeded. 5.3.3 The lower limit of the flow-rate, qi, is the lowest flow-rate, above which the heat meter shall function without the maximum permissible errors being exceeded. 5.4 Limit of thermal power The upper limit of the thermal power is the highest power at which the heat meter shall function without the maximum permissible errors being exceeded. 5.5 Maximum admissible working pressure; PS The maximum positive internal pressure that the heat meter can withstand permanently at the upper limit of the temperature range, expressed in bar.



EN 1434-1:2007 (E) 10 5.6 Nominal pressure; PN Nominal pressure (PN): A numerical designation, which is a convenient rounded number for reference purposes. All equipment of the same nominal size (DN) designated by the same PN number shall have compatible mating dimensions. 5.7 Limits in ambient temperature The ambient temperature range in which the heat meter shall function without the maximum permissible errors being exceeded. 5.8 Limits in deviations in supply voltage The supply voltage range in which the heat meter shall function without the maximum permissible errors being exceeded. 5.9 Maximum pressure loss The loss of pressure in the heat conveying liquid passing through the flow sensor, when the flow sensor is operating at the permanent flow-rate, qp. 6 Technical characteristics 6.1 Materials and construction 6.1.1 All the constituent elements of heat meters shall be solidly constructed of materials having appropriate qualities to resist the various forms of corrosion and wear which occur under rated operating conditions, especially those due to impurities in the heat conveying liquid. Correctly installed meters shall also be able to withstand normal external influences. Meters shall, in all circumstances, withstand the maximum admissible pressure and the temperatures for which they are designed, without malfunction. 6.1.2 The supplier of the heat meter shall declare any limitations with regard to installation of the heat meter and its orientation, with respect to the vertical. 6.1.3 The casing of a heat meter shall protect the interior parts against water and dust ingress. The minimum forms of enclosure protection shall be IP54 for heating applications and IP65 for cooling applications for equipment that is to be installed into pipe work and IP52 for other enclosures, all in accordance with EN 61010-1. 6.1.4 Heat meters may be fitted with interfaces allowing the connection of supplementary devices. Such connections shall not modify the metrological qualities of the heat meter. 6.1.5 The maximum pressure loss at qp shall not exceed 0,25 bar, except where the heat meter includes a flow controller or also acts as a pressure reducing device. 6.2 Requirements outside the limiting values of the flow rate When the true value of the flow rate is less than a threshold value declared by the supplier, no registration is allowed. NOTE The flow-rate through a "nominally" closed valve or the movement of liquid in the pipe behind a closed valve caused by thermal expansion and contraction should not be recorded.



EN 1434-1:2007 (E) 11 For flow rates greater than qs, the behaviour of the meter, e.g. by producing spurious or zero signals, shall be declared by the manufacturer. Flow rates greater than qs shall not result in a positive error greater than 10 % of the actual flow-rate. 6.3 Display 6.3.1 The quantity of heat shall be indicated in Joules, Watt-hours or in decimal multiples of those units. The name or symbol of the unit, in which the quantity of heat is given, shall be indicated adjacent to the figures of the display. 6.3.2 Heat meters shall be so designed, that, in the event of a failure or interruption of the external power supply (mains or external DC), the meter indication of energy remains accessible for a minimum of one year. The supplier shall specify how the indication of energy is handled in case of a failure or interruption in the external power supply (mains or external DC). NOTE The energy indication can either be stored in a permanent way (memory) at certain intervals, or it can be stored through a controlled shut-down process (powered from an internal source). 6.3.3 The reading of the indication shall be sure, easy and unambiguous. 6.3.4 The real or apparent height of the figures on the display for energy shall not be less than 4 mm. 6.3.5 The figures indicating decimal fractions of a unit shall be separated from the others, either by a comma or by a point. In addition, the figures indicating decimal fractions of energy shall be clearly distinguishable from the others. 6.3.6 Where the display is of the roller-type, the advance of a figure of a particular significance shall be completed during the time, when the figure of next lower significance changes from 9 to 0. The roller carrying the figures of lowest significance may have a continuous movement, of which the visible displacement shall then be from bottom to top. 6.3.7 The display indicating the quantity of heat shall be able to register, without overflow, a quantity of heat at least equal to the transfer of energy, which corresponds to a continuous operation for 3 000 h at the upper limit of the thermal power of the heat meter. The quantity of heat, measured by a heat meter, operating at the upper limit of the thermal power for 1 h shall correspond to at least one digit of lowest significance of the display. 6.4 Protection against fraud Heat meters shall have protective devices which can be sealed in such a way, that after sealing, both before and after the heat meter has been correctly installed, there is no possibility of dismantling, removing, or altering the heat meter or its adjustment devices without evident damage to the device(s) or seal(s). Means shall also be provided for meters with external power supply, either to give protection against the meter being disconnected from the power supply, or to make it evident, that this has taken place. This requirement does not apply to meters with external power supply with automatic switchover to internal battery supply. NOTE Embodiment of an hour's run counter in the meter casing will make it evident if the power supply has been disconnected. 6.5 Supply voltage 6.5.1 AC mains operated heat meters or subassemblies shall have a rated voltage, 196 V < Un < 253 V. 6.5.2 Remote DC or AC operated heat meters or subassemblies shall have a rated voltage Un of 24 V. The tolerance for DC shall be 12 V to 42 V and for AC 12 V to 36 V



EN 1434-1:2007 (E) 12 If the remote supply lines are also used for data transmission (e.g. M-bus, see EN 1434-3) these values shall be maintained during any data transmission. 6.5.3 Local external DC operated meters or subassemblies shall preferably have a rated voltage Un of 6 V, 3,6 V or 3 V. Table 1 — Standardized levels for external powering Nominal voltage 6 V 3,6 V 3 V Max. average current 100 mA 10/20/50/100/200 µA 10/20/50/100/200 µA Tolerance at average current 5,4 V to 6,6 V 3,4 V to 3,8 V 2,8 V to 3,3 V Peak current 100 mA 10 mA 5 mA Min. voltage at peak current 5,4 V 3,2 V 2,7 V
6.6 Qualifying immersion depth of a temperature sensor By immersion beyond the qualifying immersion depth the resistance shall not change by more than what correspond to 0,1 K. 6.7 The influence on a temperature sensor pair caused by mounting in pockets The difference in measuring result with and without specified pockets shall be within 1/3rd of the MPE. 6.8 Reproducibility The application of the same meter (or sub-assembly) in a different location or by a different user, all other conditions being the same, shall result in the close agreement of successive measurements. The difference between the measurement results shall be small when compared with the maximum permissible error 6.9 Repeatability The application of the same meter (or sub-assembly) under the same conditions of measurement shall result in the close agreement of successive measurements. The difference between the measurement results shall b
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