SIST EN 1434-1:1997/A1:2002
(Amendment)Heat meters - Part 1: General requirements
Heat meters - Part 1: General requirements
Migrated from Progress Sheet (TC Comment) (2000-07-10): Technical problems have delayed the work for already more than 6 months (BP ++ note - 99-05-20) ++ Delay due to technical/political problems (BP note) ++ Res. 46 : approved to become amendment instead of revision (MB/991020)
Wärmezähler - Teil 1: Allgemeine Anforderungen
Compteurs d'énergie thermique - Partie 1: Exigences générales
La présente norme européenne s'applique aux compteurs d'énergie thermique, a savoir aux instruments destinés a mesurer l'énergie qui, dans un circuit d'échange thermique, est absorbée ou cédée par un liquide appelé liquide caloporteur. Le compteur d'énergie thermique indique la quantité d'énergie en unités légales.
La présente norme ne traite pas des prescriptions relatives a la sécurité électrique.
Elle ne traite pas des prescriptions relatives a la sécurité de pression.
Elle ne traite pas des sondes montées en surface.
La partie 1 spécifie les prescriptions générales.
Toplotni števci - 1. del: Splošne zahteve
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 1434-1:1997/A1:2002
01-november-2002
Toplotni števci - 1. del: Splošne zahteve
Heat meters - Part 1: General requirements
Wärmezähler - Teil 1: Allgemeine Anforderungen
Compteurs d'énergie thermique - Partie 1: Exigences générales
Ta slovenski standard je istoveten z: EN 1434-1:1997/A1:2002
ICS:
17.200.10 Toplota. Kalorimetrija Heat. Calorimetry
SIST EN 1434-1:1997/A1:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 1434-1:1997/A1:2002
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SIST EN 1434-1:1997/A1:2002
EUROPEAN STANDARD
EN 1434-1:1997/A1
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2002
ICS 17.200.10
English version
Heat meters - Part 1: General requirements
Compteurs d'énergie thermique - Partie 1: Prescriptions Wärmezähler - Teil 1: Allgemeine Anforderungen
générales
This amendment A1 modifies the European Standard EN 1434-1:1997; it was approved by CEN on 1 July 2002.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this
amendment into the relevant national standard without any alteration. Up-to-date lists and bibliographical references concerning such
national standards may be obtained on application to the Management Centre or to any CEN member.
This amendment 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 Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2002 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1434-1:1997/A1:2002 E
worldwide for CEN national Members.
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SIST EN 1434-1:1997/A1:2002
EN 1434-1:1997/A1:2002 (E)
Contents
page
Foreword.2
Introduction .4
1 New clauses .4
2 Amended clauses .5
2
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SIST EN 1434-1:1997/A1:2002
EN 1434-1:1997/A1:2002 (E)
Foreword
This document (EN 1434-1:1997/A1:2002) has been prepared by Technical Committee CEN/TC 176 "Heat
meters", the secretariat of which is held by DS.
This Amendment to the 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 March 2003, and conflicting national standards shall be
withdrawn at the latest by March 2003.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this Amendment to the European Standard: Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway,
Portugal, Spain, Sweden, Switzerland and the United Kingdom.
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SIST EN 1434-1:1997/A1:2002
EN 1434-1:1997/A1:2002 (E)
Introduction
This amendment to EN 1434-1 is divided into 2 main areas. The first being the new clauses – i.e. clauses which are
not present in the 1997 version. The second being the amended clauses, where the entire clause – not only the
changes – is presented.
It has been prepared in such a way that it can be cut and pasted into the old version.
A new descriptor has been added: cooling meters.
1 New clauses
4.18 Cooling meter
A heat meter designed for cooling applications at low temperatures, normally covering the temperature range 2 C
to 30 C and up to 20 K.
4.19 Flow direction
The 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
An 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.
4.22 Maximum admissible temperature
The 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 hours in the total life time
of the unit) without a significant fault after the exposure to this maximum admissible temperature.
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SIST EN 1434-1:1997/A1:2002
EN 1434-1:1997/A1:2002 (E)
4.23 Long life flow sensor
A flow sensor designed to have a longer lifetime that a normal flow sensor which typically lasts for 5 years.
2 Amended clauses
1 Scope
This European Standard 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 standard.
Pressure safety requirements are not covered by this standard.
Surface mounted sensors are not covered by this standard.
Part 1 specifies general requirements.
NEW TEXT
6.1.2 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 pipework and IP52 for other enclosures, all in accordance with
IEC 1010-1.
NEW TEXT
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).
NEW TEXT
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.
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SIST EN 1434-1:1997/A1:2002
EN 1434-1:1997/A1:2002 (E)
NEW TEXT
6.5 Mains voltage
10%
6.5.1 AC mains operated heat meters or subassemblies shall have a rated voltage, U , of 230 V .
n
15%
6.5.2 Remote DC or AC operated heat meters or subassemblies shall have a rated voltage U of 24 V. The
n
tolerance for DC shall be 12 V to 42 V and for AC 50 %.
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 U of 6 V, 3,6 V
n
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 A 10/20/50/100/200 A
Tolerance at average 5,4 to 6,6 V 3,4 to 3,8 V 2,8 to 3,3 V
current
Peak current 100 mA 10 mA 5 mA
Min. voltage at peak 5,4 V 3,2 V 2,7 V
current
NEW TEXT
7.1 Temperature difference
The ratio of the upper and lower limits of the temperature difference shall not be less than 10, with the exception
of heat meters intended for cooling circuits. The lower limit shall be stated by the supplier to be either 1, 2, 3, 5
or 10 K. The preferred lower limit is 3 K for heating applications.
NOTE For temperature difference values below 3 K the temperature test equipment should be of the highest precision.
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SIST EN 1434-1:1997/A1:2002
EN 1434-1:1997/A1:2002 (E)
NEW TEXT
9.2.1 Maximum permissible relative errors of complete
...
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