SIST EN 1434-1:2016

SLOVENSKI STANDARD
oSIST prEN 1434-1:2014
01-april-2014
Toplotni števci - 1. del: Splošne zahteve
Heat meters - Part 1: General requirements
Wärmezähler - Teil 1: Allgemeine Anforderungen
Comteurs d´engine thermique - Partie 1: Prescriptions générales
Ta slovenski standard je istoveten z: prEN 1434-1 rev
ICS:
17.200.10 Toplota. Kalorimetrija Heat. Calorimetry
oSIST prEN 1434-1:2014 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 1434-1:2014

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oSIST prEN 1434-1:2014

EUROPEAN STANDARD
DRAFT
prEN 1434-1 rev
NORME EUROPÉENNE

EUROPÄISCHE NORM

February 2014
ICS 17.200.10 Will supersede EN 1434-1:2007
English Version
Heat meters - Part 1: General requirements
Compteurs d'énergie thermique - Partie 1: Prescriptions Wärmezähler - Teil 1: Allgemeine Anforderungen
générales
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.

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: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1434-1 rev:2014 E
worldwide for CEN national Members.

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Contents Page
Foreword .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .5
4 Types of instruments . 10
4.1 General . 10
4.2 Complete instrument . 10
4.3 Combined instrument . 10
4.4 Hybrid instrument . 10
4.5 Sub-assemblies of a heat meter, which is a combined instrument . 10
4.5.1 General . 10
4.5.2 Flow sensor . 10
4.5.3 Temperature sensor pair . 10
4.5.4 Calculator . 10
4.5.5 Equipment under test (EUT) . 10
5 Rated operating conditions . 10
5.1 Limits of temperature range . 10
5.2 Limits of temperature differences . 11
5.3 Limits of flow rate . 11
5.4 Limit of thermal power . 11
5.5 Limits of working pressure (PS and P ) . 11
min
5.6 Nominal pressure (PN) . 11
5.7 Limits in ambient temperature . 11
5.8 Limits in deviations in supply voltage . 12
5.9 Maximum pressure loss . 12
5.10 Specific requirements on registration devices . 12
5.10.1 General . 12
5.10.2 Suitability . 12
5.10.3 Rated operated conditions . 12
5.10.4 Indication . 12
5.10.5 MPE . 13
6 Technical characteristics . 14
6.1 Materials and construction . 14
6.2 Requirements outside the limiting values of the flow rate . 14
6.3 Display . 14
6.4 Protection against fraud . 15
6.5 Supply voltage . 15
6.6 Qualifying immersion depth of a temperature sensor . 16
6.7 The influence on a temperature sensor pair caused by mounting in pockets . 16
6.8 Reproducibility . 16
6.9 Repeatability . 16
6.10 Software . 16
7 Specified working range . 16
7.1 General . 16
7.2 Temperature difference . 17
7.3 Flow rate . 17
8 Heat transmission formula . 17
9 Metrological characteristics (Maximum Permissible Error, MPE) . 17
9.1 General . 17
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9.2 Values of maximum permissible errors . 18
9.2.1 Maximum permissible relative errors of complete heat meters . 18
9.2.2 Maximum permissible relative error of sub-assemblies . 18
9.3 Application of maximum permissible errors . 19
10 Environmental classification . 19
10.1 General . 19
10.2 Environmental class A (Domestic use, indoor installations) . 19
10.3 Environmental class B (Domestic use, outdoor installations) . 19
10.4 Environmental class C (Industrial installations) . 20
10.5 Mechanical classes M1 to M3 . 20
11 Heat meter specification . 20
11.1 General . 20
11.2 Flow sensor . 20
11.3 Temperature sensor pair . 21
11.4 Calculator . 22
11.5 Complete meters . 23
12 Information to be delivered with the meter or sub-assemblies . 25
12.1 Installation instructions . 25
12.2 Parameter setting instructions . 26
12.3 Adjustment instructions . 26
12.4 Maintenance instructions . 27
12.5 Hints for disposal instructions . 27
Annex A (normative) Heat coefficient equations . 28
Annex B (normative) Flow conditioner package . 31
Annex C (informative) Fast response meters . 33
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2004/22/EC, MID . 34
Bibliography . 35

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Foreword
This document (prEN 1434-1:2014) has been prepared by Technical Committee CEN/TC 176 “Heat meters”,
the secretariat of which is held by SIS.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1434-1:2007.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive.
For relationship with EU Directive, see informative Annex ZA, which is an integral part of this document.
EN 1434 Heat meters consists of the following parts:
 Part 1: General requirements
 Part 2: Constructional requirements
1)
 Part 3: Data exchange and interfaces
 Part 4: Pattern approval tests
 Part 5: Initial verification tests
 Part 6: Installation, commissioning, operational monitoring and maintenance
In comparison to EN 1434-1:2007, the following changes have been made:
 special cases for combined cooling and heating meters are added;
 additional functionality for smart metering applications are added;
 metrological requirements for smart metering applications are added;
 definitions and requirements for the cooling meter are added;
 tariff meters are added;
 terms and definitions, requirements for registration devices and cooling meters are added;
 requirements for fast response meters are added (informative Annex C).

1) EN 1434-3 is maintained by CEN/TC 294
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1 Scope
This European Standard (prEN 1434-1:2014) specifies the general requirements and applies to heat meters.
Heat meters are instruments intended for measuring the energy which in a heat-exchange circuit is absorbed
(cooling) or given up (heating) by a liquid called the heat-conveying liquid. The heat meter indicates the
quantity of heat in legal units.
Electrical safety requirements are not covered by this European Standard.
Pressure safety requirements are not covered by this European Standard.
Surface mounted temperature sensors are not covered by this European Standard.
This standard covers meters for closed systems only, where the differential pressure over the thermal load is
limited.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
prEN 1434-2:2014, Heat meters — Part 2: Constructional requirements
prEN 1434-4:2014, Heat meters — Part 4: Pattern approval test
EN 60751, Industrial platinum resistance thermometers and platinum temperature sensors
EN 61010-1, Safety requirements for electrical equipment for measurement, control and laboratory use —
Part 1: General requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
response time
τ
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
3.3
rated voltage
U
n
voltage of the external power supply required to operate the heat meter, conventionally the voltage of the AC
mains supply
3.4
rated operating conditions
conditions of use, giving the range of values of influence quantities, for which the metrological characteristics
of the instrument are within the specified maximum permissible errors
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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
3.10.3
significant fault
fault greater than the absolute value of the MPE and not being a transitory fault
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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
value of a quantity, which for the purpose of this European Standard is considered as the true value
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.
3.13
meter model
different sizes of heat meters or sub-assemblies having a family similarity in the principles of operation,
construction and materials
3.14
electronic device
device employing electronic elements and performing a specific function
3.15
electronic element
smallest physical entity in an electronic device which uses electron hole conduction in semi-conductors, or
electron conduction in gases or in a vacuum
3.16
qualifying immersion depth of a temperature sensor
immersion depth over which the sensor is considered stable enough for the purpose of this European
Standard
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
meters other than for heating

3.18.1
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
3.18.2
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.
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Key
No energy recording

Heating

Cooling

Figure 1 — Example for function of heating and cooling register
3.19
flow direction
direction of the liquid going through the system from inlet to outlet
Note 1 to entry: The inlet is for the heating case the hot side and for the cooling case the cold side.
Note 2 to entry: In the literature the word "flow" is also being used for "inlet", and the word "return" is also being used
for "outlet".
Note 3 to entry: Different temperature values for θ for heating and cooling applications may also occur.
hc
3.20
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
3.21
pulse output and input devices

3.21.1
pulse output device
functional part of flow sensor, calculator or auxiliary devices
EXAMPLE Remote displays or input devices of control systems
3.21.2
pulse input device
functional part of flow sensor, calculator or auxiliary devices
EXAMPLE Remote displays or input devices of control systems
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3.22
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 (< 1 h / day; < 200 h / year)
without a significant fault after the exposure to this maximum admissible temperature
3.23
durability
a measuring instrument shall be designed to maintain an adequate stability of its metrological characteristics
(e.g. to fulfil the double of MPE) over a period of time estimated by the manufacturer, provided that it is
properly installed, maintained and used according to the manufacturer's instruction when in the environmental
conditions for which it is intended under treated water conditions
Note 1 to entry: Adapted from Directive 2004/22/EC of the European Parliament and of the Council (MID Measuring
Instruments Directive).
3.24
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
3.25
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)
3.26
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
3.27
meter for smart metering
heat meter or cooling meter with the capability of data communication and support of smart metering
functionalities
Note 1 to entry: Data could be transmitted via user interface and/ or communication interface in fixed time intervals
and/or on request.
Note 2 to entry: For more information on smart meters see standard series EN 13757 and CEN/CLC/ETSI TR 50572.
3.28
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
3.29
register
a component of a registration device which contains accumulated or actual values e.g. thermal energy,
volume, maximum flow rate, power or temperature
3.30
interval register
a 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.
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Note 2 to entry: During consecutive time intervals the measured process values of flow rate and/or temperature could
be additionally stored.
4 Types of instruments
4.1 General
For the purposes of this European Standard, heat meters are defined either as complete instruments or as
combined instruments.
4.2 Complete instrument
A heat meter, which does not have separable sub-assemblies as defined in 4.5.
4.3 Combined instrument
A heat meter, which has separable sub-assemblies as defined in 4.5.
4.4 Hybrid instrument
A heat meter, which for the purpose of pattern approval and verification can be treated as a combined
instrument as defined in 4.3 or combinations between sub-assemblies. However, after verification, its sub-
assemblies shall be treated as inseparable.
4.5 Sub-assemblies of a heat meter, which is a combined instrument
4.5.1 General
The flow sensor, the temperature sensor pair and the calculator or a combination of these.
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.
4.5.5 Equipment under test (EUT)
A sub-assembly, a combined sub-assembly or a complete meter subject to a test.
5 Rated operating conditions
5.1 Limits of temperature range
5.1.1 The upper limit of the temperature range, θ , is the highest temperature of the heat conveying
max
liquid, at which the heat meter shall function without the maximum permissible errors being exceeded.
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5.1.2 The lower limit of the temperature range, θ , is the lowest temperature of the heat-conveying liquid,
min
at which the heat meter shall function without the maximum permissible errors being exceeded.
5.1.3 The optional switching over temperature, θ , is for switching over between heating and cooling in
hc
bifunctional meters.
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 inlet and outlet of the heat-exchange circuit.
5.2.2 The upper limit of the temperature difference, ∆Θ , is the highest temperature difference, at which
max
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, ∆Θ , is the lowest temperature difference, above
min
which the heat meter shall function, without the maximum permissible errors being exceeded.
5.2.4 The value ∆Θ for switching over between heating and cooling energy and reversed is the threshold
hc
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, q , is the highest flow rate, at which the heat meter shall function for
s
short periods (< 1 h / day; < 200 h / year), without the maximum permissible errors being exceeded.
5.3.2 The permanent flow rate, q , is the highest flow rate, at which the heat meter shall function
p
continuously without the maximum permissible errors being exceeded.
5.3.3 The lower limit of the flow rate, q , is the lowest flow rate, above which the heat meter shall function
i
without the maximum permissible errors being exceeded.
5.4 Limit of thermal power
The upper limit of the thermal power is the h
...