SIST EN 1434-4:2007
(Main)Heat meters - Part 4: Pattern approval tests
Heat meters - Part 4: Pattern approval tests
This European Standard specifies pattern approval tests applies to heat meters, that is to instruments intended for measur¬ing 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 4: Prüfungen für die Bauartzulassung
Diese Europäische Norm legt Prüfungen für die Bauartzulassungen gilt für Wärmezähler fest, 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 Europäischen Norm nicht behandelt.
Den Druck betreffende Sicherheitsanforderungen werden in dieser Europäischen Norm nicht behandelt.
Oberflächenmontierte Sensoren werden in dieser Europäischen Norm nicht behandelt.
Compteurs d'énergie thermique - Partie 4: Essais en vue de l'approbation de modele
Toplotni števci - 4. del: Preskusi za odobritev tipa
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Heat meters - Part 4: Pattern approval testsToplotni števci - 4. del: Preskusi za odobritev tipaCompteurs d'énergie thermique - Partie 4: Essais en vue de l'approbation de modeleWärmezähler - Teil 4: Prüfungen für die BauartzulassungTa slovenski standard je istoveten z:EN 1434-4:2007SIST EN 1434-4:2007en17.200.10Toplota. KalorimetrijaHeat. CalorimetryICS:SIST EN 1434-4:1997/A1:2002SIST EN 1434-4:19971DGRPHãþDSLOVENSKI
STANDARDSIST EN 1434-4:200701-maj-2007
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1434-4February 2007ICS 17.200.10Supersedes EN 1434-4:1997
English VersionHeat meters - Part 4: Pattern approval testsCompteurs d'énergie thermique - Partie 4: Essais en vuede l'approbation de modèleWärmezähler - Teil 4: Prüfungen für die BauartzulassungThis 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 1434-4:2007: E
EN 1434-4:2007 (E) 2 Contents Page Foreword.4 1 Scope.5 2 Normative references.5 3 General.6 4 Requirements.6 5 Specification of operating conditions.6 5.1 Rated operating conditions.6 5.2 Reference conditions.6 5.3 Reference values for the measurand, RVM.7 5.3.1 General.7 5.3.2 Reference values for the measurand, RVM, for qp ≤≤≤≤ 3,5 m3/h.7 5.3.3 Reference values for the measurand, RVM, for qp > 3,5 m3/h.7 6 Tests and measurements.8 6.1 General.8 6.2 Test programme.8 6.3 Uncertainty of test equipment.10 6.4 Performance tests.10 6.4.1 General.10 6.4.2 Flow sensor.10 6.4.3 Calculator.12 6.4.4 Temperature sensors.12 6.4.5 Combined sub-assemblies or complete meter.13 6.5 Dry heat.14 6.5.1 General.14 6.5.2 Calculator.14 6.5.3 Flow sensor.14 6.5.4 Combined sub-assemblies or complete meter.14 6.6 Cold.14 6.6.1 General.14 6.6.2 Calculator.15 6.6.3 Flow sensor.15 6.6.4 Combined sub-assemblies or complete meter.15 6.7 Static deviations in supply voltage.15 6.8 Durability test.17 6.8.1 General.17 6.8.2 Flow sensor.17 6.8.3 Temperature sensors.18 6.8.4 Combined sub-assemblies or complete meter.19 6.9 Damp heat cyclic.19 6.10 Short time mains voltage reduction.20 6.11 Electrical transients.20 6.11.1 Fast transients (bursts).20 6.11.2 Surge transients.22 6.12 Electromagnetic field.24 6.13 Electromagnetic field specifically caused by digital radio equipment.24 6.14 Radio frequency amplitude modulated.25 6.15 Electrostatic discharge.27 6.16 Static magnetic field (fraud protection).28 6.17 Electromagnetic field at mains frequency.29
EN 1434-4:2007 (E) 3 6.18 Internal pressure.29 6.19 Pressure loss.30 6.20 Electromagnetic emission.30 6.20.1 General.30 6.20.2 Conducted emission on power AC lines.30 6.20.3 Conducted emission on signal and DC power lines.30 6.20.4 Radiated emission.31 6.21 24 h interruption in the mains power supply voltage.31 6.22 Flow disturbances.31 7 Documentation.32 Annex A (informative)
Testing procedure for temperature sensor pairs
with or without pockets.33 A.1 Test set-up.33 A.2 Test sequence.35 A.3 Calculations.35 Annex B (informative)
Checklist for type approvals of heat meters according to EN 1434.36 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of
EU Directive 2004/22/EC, MID.46 Bibliography.47
EN 1434-4:2007 (E) 4 Foreword This document (EN 1434-4:2007) 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 1434-4:1997. The other parts are: Part 1 - General requirements Part 2 - Constructional requirements Part 3 - Data exchange and interfaces 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 1434-4:2007 (E) 5 1 Scope This European Standard specifies pattern approval tests 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. ENV 13005, Guide to the expression of uncertainty in measurement EN 1434-1:2007, Heat meters — Part 1: General requirements EN 14154-3:2005, Water meters — Part 3: Test methods and equipment EN 55022:, Information technology equipment - Radio
disturbance characteristics - Limits and methods
of measurement (CISPR 22:2005, modified) EN 60068-2-1, Environmental testing — Part 2: Tests — Test A: Cold (IEC 60068-2-1:1990) EN 60068-2-2, Basic environmental testing procedures — Part 2-2: Tests — Tests B: Dry heat (IEC 60068-2-2:1974 +
IEC 60068-2-2A:1976) EN 60068-2-30, Environmental testing — Part 2-30: Tests — Test Db: Damp heat, cyclic (12 h + 12 h cycle) (IEC
60068-2-30:2005) EN 60751:1995, Industrial platinum resistance thermometer sensors (IEC 60751:1983 + A1:1986) EN 61000-4-2, Electromagnetic compatibility (EMC) — Part 4: Testing and measurement techniques — Section 2: Electrostatic discharge immunity test — Basic EMC publication (IEC 61000-4-2:1995) EN 61000-4-3, Electromagnetic compatibility (EMC) — Part 4-3: Testing and measurement techniques — Radiated, radio-frequency, electromagnetic field immunity test (IEC 61000-4-3:2006) EN 61000-4-4, Electromagnetic compatibility (EMC) — Part 4-4: Testing and measurement techniques — Electrical fast transient/burst immunity test (IEC 61000-4-4:2004) EN 61000-4-5, Electromagnetic compatibility (EMC) — Part 4: Testing and measurement techniques — Section 5: Surge immunity test (IEC 61000-4-5:1995) EN 61000-4-6:1996, Electromagnetic compatibility (EMC) — Part 4-6: Testing and measurement techniques — Section 6: Immunity to conducted disturbances, induced by radio-frequency fields (IEC 61000-4-6:1996) EN 61000-4-8, Electromagnetic compatibility (EMC) — Part 4: Testing and measurement techniques — Section 8: Power frequency magnetic field immunity test — Basic EMC publication (IEC 61000-4-8:1993)
EN 1434-4:2007 (E) 6 EN 61000-4-11, Electromagnetic compatibility (EMC) — Part 4-11: Testing and measuring techniques — Voltage dips, short interruption and voltage variations immunity tests (IEC 61000-4-1:2004) ISO 4064-3:2005, Measurement of water flow in fully charged closed conduits — Meters for cold potable water and hot water — Part 3: Test methods and equipment 3 General The procedure shall ascertain that the pattern conforms to the metrological requirements of this European Standard. In addition to the checking of the documentation (Clause 7) and the comparison of the pattern with the metrological requirements of this European Standard, the tests in Clause 6 shall be performed. It is recommended to use a checklist as in Annex B to report in a standardised way the result of the comparison between the pattern under approval with the essential requirements of this European Standard. 4 Requirements Under normal operating conditions, the error of heat meters or their sub-assemblies shall not exceed the maximum permissible error, MPE specified in EN 1434-1. When heat meters or their sub-assemblies are exposed to disturbances, significant faults shall not occur. 5 Specification of operating conditions 5.1 Rated operating conditions The rated operating conditions are those given in Table 1. Table 1 — Rated operating conditions Environmental class A B C Ambient temperature in ºC + 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 fnom ±2 % 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 supplier
5.2 Reference conditions Range of ambient temperature: + 15 ºC to + 35 ºC Range of relative humidity: 25 % to 75 % Range of ambient air pressure: 86 kPa to 106 kPa
EN 1434-4:2007 (E) 7 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 heat meter. 5.3 Reference values for the measurand, RVM 5.3.1 General For heating/cooling meters the RVM shall be based on the values for the heating range. 5.3.2 Reference values for the measurand, RVM, for qp ≤≤≤≤ 3,5 m3/h
Table 2 — Reference values for heating and cooling
Heating applications Cooling applications Range of temperature difference
(40 ± 2) K
or K02max−∆Θ
if
max∆Θ is less than 40 K (10 ± 2) K Range of flow-rate: (0,7 to 0,75) qp in m3/h
(0,7 to 0,75) qp in m3/h
Return temperature: (50 ± 5) ºC or
the upper limit of the return temperature, if it is less than 50 ºC (50 ± 5) ºC or the upper limit of the temperature range, if it is less than 50 ºC
The conditions, mentioned in Table 2, are reference values for a complete heat meter. Reference values for sub-assemblies are the relevant parts of the conditions mentioned in Table 2. 5.3.3 Reference values for the measurand, RVM, for qp > 3,5 m3/h Flow-rate simulation for the flow sensor electronics is allowed, but testing with water is always preferred and carried out in accordance with 5.3.2. If flow-rate simulation is used, the following RVM values apply: Range of temperature differences:
For heating applications: (40 ± 2) K
or
K02max−∆Θ
if
max∆Θ is less than 40 K For cooling applications: (10 ± 2) K
EN 1434-4:2007 (E) 8 The temperature of the liquid in the flow sensor shall be kept at (50 ± 5) °C or at ambient temperature Range of flow-rate: (0,7 to 0,75) qp
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). 6 Tests and measurements 6.1 General Unless otherwise stated in the test specification, the test requirements apply irrespective of the heat meter's environmental class. See Clause 10 of EN 1434-1:2007. All measurements shall be carried out under the installation conditions stipulated by the supplier 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. If so, 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 in all the tests. If the error determined lies outside the MPE, the test shall be repeated twice unless otherwise stated. The test is then declared satisfactory 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 6.4, 6.18 and 6.19 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 6.8 shall be carried out only for those sizes of a type for which the highest wear is expected. For dimensions > DN 200, 6.19 shall be carried out at Θmin. For each meter model the following tests shall be carried out on one size only: 6.5, 6.6, 6.7, 6.9, 6.10, 6.11, 6.12, 6.13, 6.14, 6.15, 6.16, 6.17, 6.20 and 6.21. 6.2 Test programme Samples of a heat 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 con-ditions and the samples shall be exposed to the influence factors or disturbances specified for the respective tests, as stated in Table 3. The test sequence and the number of items used shall be either as described in Table 2 or as agreed between the supplier and the testing laboratory (assuming four samples, numbered by the testing laboratory). Only one influence quantity shall be applied at a time. If the meter under test (complete, combined or sub-assemblies) has test outputs for quantity of water, temperature difference and/or energy, these outputs can be used to test such parameters.
EN 1434-4:2007 (E) 9 Table 3 — Test programme for heat meters and their sub-assemblies. Test Sub-clause Exposure Tempera-ture sensor pair Flow
sensor Calcula-ting dev-ice
Compl-ete meter Sample no.
INFLUENCE FAC-TORS
MPE
6.4 Performance test
X
X
X
X
2
MPE
6.5 Dry heat
X(a)
X
X
2
MPE
6.6 Cold
X(a)
X
X
2
MPE
6.7 Static deviations in supply voltage
X(a)
X
X
2
DISTURBANCES
NSFa
6.8 Durability
X
X
X
4
NSFd
6.9 Damp heat, cyclic
X(a)
X
X
1
NSFd
6.10 Short time reduction in supply voltage
X(a)
X
X
3
NSFa
6.11 Electrical transients
X(a)(b)
X(b)
X
3
NSFd
6.12 Electromagnetic field
X(a)(b)
X(b)
X
3 NSFd 6.13 Electromagnetic field - digital radio equipm.
X(a)(b) X(b) X
3 NSFd 6.14 Radio frequency, amplitude modulated
X(a)(b) X(b) X
3
NSFa
6.15 Electrostatic discharge
X(a)
X
X
3
NSFd
6.16 Static magnetic field
X
X
X
3
NSFd
6.17 Electromagnetic field at mains frequency
X(a)
X
X
3
NSFa
6.18 Internal pressure
X
X
1
6.19 Pressure loss
X
X
1
6.20 Electromagnetic emis-sion
X(a)
X(b)
X
3
6.21 24 hrs interruption in supply voltage
X X
3 NSFd 6.22 Flow disturbances
X
X 1
MPE
-
Maximum permissible error according to Clause 9 of EN 1434-1:2007
NSFd -
No significant fault shall occur during the test
NSFa -
No significant fault shall occur after the test
X
-
Test to be performed
a
-
Only for flow sensors with electronic devices
b
-
This test shall be done with connected cables
EN 1434-4:2007 (E) 10 For heating/cooling meters the tests in 6.4 shall cover both functions, the tests in 6.6 and 6.9 shall be carried out using the cooling function, but all other tests shall be carried out using the heating function. (For RMV values see 5.3.) 6.3 Uncertainty of test equipment Standards, instruments and methods used in pattern approval tests shall suit the purpose, be traceable to more precise standards and be part of a reliable calibration programme. The uncertainties associated with these standards, methods and measuring instruments shall always be known. They shall be calculated according to ENV 13005 with a coverage factor of 2 corresponding to a coverage probability of 95 %. The expanded uncertainties shall either: a) not exceed 1/5 of the maximum permissible errors of the heat meter or the sub-assemblies, or b) be subtracted from the maximum permissible errors of the heat meter or the sub-assemblies to obtain a new MPE, or otherwise specified in the test description of this standard. The use of a) is recommended - b) may only be used when ∆Θ ≤ 3 K. 6.4 Performance tests 6.4.1 General The initial intrinsic error shall be determined at least at the conditions stated in 6.4.2, 6.4.3, 6.4.4 and 6.4.5. 6.4.2 Flow sensor 6.4.2.1 General All performance tests shall be carried out three times. For a meter model with more than one specified mounting orientation, the performance testing shall be performed in the orientation, where the higher influences are expected. 6.4.2.2 Flow rates Flow rates: q1%0%10−, q2 ± 5%, q3 ± 5%, q4 ± 5% and q5 %10%0+
where q1 = qs and q5 = qi,
q1/q2 = q2/q3 = q3/q4 = q4/q5 = K where
EN 1434-4:2007 (E) 11 4isqqK= The test flow rate nearest to 0,7 qp to 0,75 qp shall be changed to be within 0,7 qp to 0,75 qp in order to obtain one point within RVM conditions. Table 4 — Water temperatures
Applications
Heating Cooling
Type of flow sensor All Mechanical with qp/qi ≤ 10 Static with qp/qi ≤ 25 Mechanical with qp/qi > 10 Static with qp/qi > 25 a Θmin to (Θmin + 5) °C (but not less than 10 °C) (15 ± 5) °C (15 ± 5) °C b (50 ± 5) °C
(5 ± 1) °C
c (85 ± 5) °C
The water temperature at the heat meter shall not vary by more than 2 K during a measurement. For flow sensors larger than DN250, testing at water temperature a) only, is considered sufficient if the following conditions are satisfied: • the test results for smaller flow sensors of the same model are inside MPE for all water temperatures; • documentary evidence is given that technological similarity exists between the models tested and the larger sizes applied for. 6.4.2.3 Electromagnetic type flow sensors shall be tested with water having an electrical conductivity higher than 200 µS/cm. If the supplier has stated a lower permitted conductivity, tests shall also be performed at that conductivity at the flow rates q1 and q5, and at the water temperature a). The conductivity shall be noted in the certificate. If the electronic part of the flow sensor is separated from the sensor head, the type and the maximum length of the connecting cable to the electrodes shall be stated by the supplier, be used for the above mentioned low conductivity test and noted in the certificate. 6.4.2.4 For fast response meters the transient behaviour of the flow sensors of size qp ≤ 2,5 m;/h shall be investigated by measuring the total quantity of water delivered in 10 to 15 cycles, consisting of a 10 s period at a flow rate of qs and a 30 s period at zero flow rate. The total quantity of water measured shall be twice the quantity used for the test at qs in 6.4.2.2. The duration of start and stop shall be (1 ± 0,2) s. The water temperature shall be as a) in 6.4.2.2. The error shall not exceed the MPE. For a complete or combined meter, the water temperature specified above is the return temperature. The
EN 1434-4:2007 (E) 12 temperature difference shall be the maximum obtainable, but shall not exceed 42 K. 6.4.3 Calculator The calculator shall be tested at the following simulated temperatures: Table 5 — Testing temperatures for heating applications Temperature
ºC Temperature difference
K
a)
Θreturn = (Θmin +5
0 )
∆Θmin, 5, 20, ∆ΘRVM
b)
Θreturn = (ΘRVM ± 5)
∆Θmin, 5, 20, ∆ΘRVM, ∆Θmax
a
c)
Θflow =
(Θmax
0 -5
)
20, ∆ΘRVM, ∆Θmax
a
The level corresponding to ∆Θmax shall be reduced if needed to be within Θmax
Table 6 — Testing temperatures for cooling applications Temperature
ºC Temperature difference
K
a)
Θflow = (Θmin +5
0 )
∆Θmin, 5, ∆ΘRVM , ∆Θmax
b)
Θflow = (15 ±5)
∆Θmin
c)
Θreturn =
(Θmax
0
-5
)
∆ΘRVM, ∆Θmax
The maximum temperature for these tests shall not exceed Θmax Tolerances: For all temperature differences:
± 20%, except for ∆Θmin: +20
0 %
and ∆Θmax:
0
-20 %
For all test points, the simulated flow rate shall not create a signal exceeding the maximum signal acceptable by the calculator. 6.4.4 Temperature sensors 6.4.4.1 Qualifying immersion depth It shall be verified in a thermostatic bath with a temperature of (90 ± 5) ºC at an ambient temperature of
(23 ± 3) ºC, that a deeper immersion than the qualifying immersion depth changes the resistance value by an amount corresponding to < 0,1 K.
EN 1434-4:2007 (E) 13 6.4.4.2 Thermal response time The temperature sensors shall be tested according to 4.3.3.3 of EN 60751:1995. For sensors designed to be mounted in pockets the test should be made with pockets using the set up defined in Annex A. The response time shall not exceed the supplier's specification. 6.4.4.3 General testing The temperature sensors of a pair shall be tested without their pockets at three temperature levels from the following scale: (5 ± 5) ºC
(40 ± 5) ºC
(70 ± 5) ºC
(90 ± 5) ºC
(130 ± 5) ºC
(160
± 10) ºC chosen to optimize the spread of temperature over the temperature range specified by the supplier. The immersion depth of the sensor under test shall be 90 % to 99 % of the total length. The determined resistance values shall be used in a system of three equations to calculate the three constants of the temperature/resistance equation of EN 60751 and a curve shall be drawn t
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