EN 1434-4:2015

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Merilniki toplote - 4. del: Preskusi za odobritev tipaWärmezähler - Teil 4: Prüfungen für die BauartzulassungCompteurs d'énergie thermique - Partie 4: Essais en vue de l'approbation de modèleHeat meters - Part 4: Pattern approval tests17.200.10Toplota. KalorimetrijaHeat. CalorimetryICS:Ta slovenski standard je istoveten z:EN 1434-4:2015SIST EN 1434-4:2016en,fr,de01-januar-2016SIST EN 1434-4:2016SLOVENSKI
STANDARDSIST EN 1434-4:2007/AC:2007SIST EN 1434-4:20071DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1434-4
November
t r s w ICS
s yä t r rä s r Supersedes EN
s v u væ vã t r r yEnglish Version
Heat meters æ Part
vã Pattern approval tests Compteurs d 5énergie thermique æ Partie
vã Essais en vue de l 5approbation de modèle
Wärmezähler æ Teil
vã Prüfungen für die Bauartzulassung This European Standard was approved by CEN on
w September
t r s wä
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
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Avenue Marnix 17,
B-1000 Brussels
t r s w 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 vã t r s w ESIST EN 1434-4:2016

Testing procedure for temperature sensor pairs with pockets and without pockets . 35 A.1 Test set-up . 35 A.2 Test sequence . 37 A.3 Calculations . 37 Annex B (informative)
Checklist for type approvals of heat meters according to EN 1434 . 38 SIST EN 1434-4:2016

Criteria for a fully developed flow profile . 52 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 2004/22/EC, MID . 53 Bibliography . 54
1) EN 1434-3 is maintained by CEN/TC 294. SIST EN 1434-4:2016

«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 manufacturer 6.2 Reference conditions Range of ambient temperature: +15 °C to +35 °C SIST EN 1434-4:2016

Heating applications Cooling applications Range of temperature difference: (40 ± 2) 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 Outlet temperature: (50 ± 5) °C (15 ± 5) °C 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. Flow rate simulation for the flow sensor electronics is allowed, but testing with water is always preferred. The temperature of the liquid in the flow sensor shall be kept at (50 ± 5) °C or at ambient temperature. 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). 7 Tests and measurements 7.1 General Unless otherwise stated in the test specification, the test requirements apply irrespective of the heat meter's environmental class. See EN 1434-1:2015, Clause 10. All measurements shall be carried out under the installation conditions stipulated by the manufacturer 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. 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 at all tests. If the error determined lies outside the MPE, the test shall be repeated twice unless otherwise stated. The test is satisfactory declared 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. SIST EN 1434-4:2016

Influence factors
MPE 7.4 Performance test X X X X 2 MPE 7.5 Dry heat
Xa X X 2 MPE 7.6 Cold
Xa X X 2 MPE 7.7 Static deviations in supply voltage
Xa X X 2
Disturbances
NSFa 7.8 Durability X X
X 4 NSF 7.9.1 7.9.2 Damp heat, cyclic Damp heat, steady-state X Xc Xa Xc X
X X 1 1 NSF 7.10 Short time reduction in supply voltage
X X X 3 NSFa 7.11 Electrical transients
Xa,b Xb X 3 NSFd 7.12 Electromagnetic field
Xa,b Xb X 3 NSFd 7.13 Electromagnetic field – digital radio equipment
Xa,b Xb X 3 NSFd 7.14 Radio frequency, amplitude modulated
Xa,b Xb X 3 NSFa 7.15 Electrostatic discharge
Xa X X 3 NSFd 7.16 Static magnetic field
X X X 3 NSFd 7.17 Mains frequency magnetic field
Xa X X 3 NSFa 7.18 Internal pressure
X
X 1
7.19 Pressure loss
X
X 1
7.20 Electromagnetic emission
Xa Xb X 3 SIST EN 1434-4:2016
7.21 24 hrs interruption
X X 3 NSFd 7.22 Flow disturbances
X
X 1 NSFa 7.23 Vibration/ mechanical shock X X X X 2 MPE Maximum permissible error according to EN 1434-1:2015, Clause 9. NSFd No signification fault shall occur during the test. NSFa No signification 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. c For cooling for meters / sub-assemblies with at least IP 65. For heating/cooling meters the tests in 7.4 shall cover both functions, the tests in 7.6 and 7.9 shall be carried out using the cooling function, but all other tests shall be carried out using the heating function. (For RVM values see 6.3.) 7.3 Uncertainty of test equipment and influences of EUT 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 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) if the uncertainty is higher than 1/5 of MPE, the value of the difference between uncertainty and 1/5 MPE shall be subtracted from MPE, to calculate a new reduced MPE. The use of a) is recommended. Uncertainty influences (combination of resolution and repeatability) coming from equipment under test shall not be more than 30 % for the flow sensor, 20 % for the calculator and 60 % for the temperature sensor pair of the MPE of each sub-assembly. 7.4 Performance tests 7.4.1 General The initial intrinsic error shall be determined at least at the conditions stated in 7.4.2, 7.4.3, 7.4.4 and 7.4.5. 7.4.2 Flow sensor 7.4.2.1 General All performance tests shall be carried out three times. SIST EN 1434-4:2016

Applications
Heating Cooling Test points All All
a minθ to minθ+ 5) °C (but not less than 10 °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 DN 250, 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. 7.4.2.3 Electromagnetic type flow sensors Electromagnetic type flow sensors shall be tested with water having an electrical conductivity higher than 200
¶ 2,5 m3/h shall be investigated by measuring the total quantity of water delivered in 10 to 15 cycles, consisting of 10 s period at a flow rate of qs and 30 s period at zero flow rate. The duration of start and stop shall be (1 ± 0,2) s. The water temperature shall be as a) in 7.4.2.2. The error shall not exceed the MPE. For a complete or combined meter, the water temperature specified above is the outlet temperature. The temperature difference shall be the maximum obtainable, but shall not exceed 42 K. 7.4.3 Calculator 7.4.3.1 Heating and cooling applications The calculator shall be tested at the following simulated temperatures: Table 5 — Testing temperatures for heating applications Temperature °C Temperature difference K a) ()5min0outletθθ+= min∆Θ, 5, 20, RVM∆Θ b) ()5outletRVMθθ=± min∆Θ, 5, 20, RVM∆Θ, max∆Θa c) ()0max5inletθθ−= 20, RVM∆Θ, max∆Θ a The level corresponding to max∆Θ shall be reduced if needed to be within maxθ. Table 6 — Testing temperatures for cooling applications Temperature °C Temperature difference K a) ()5min0inletθθ+= min∆Θ, 5, RVM∆Θ, max∆Θ b) ()155inletθ=± min∆Θ c) ()0max5outletθθ−= RVM∆Θ, max∆Θ The maximum temperature for these tests shall not exceed max. Tolerances: For all temperature differences: ± 20 %, SIST EN 1434-4:2016

> hc and at inlet > hc; — cooling energy shall only be recorded at
< - hc and at inlet < hc; — no heating and cooling energies shall be recorded between - hc and hc. The general test in this clause shall be performed both for the heating and the cooling function using the correct heat coefficient (depending on installation of the flow sensor in higher respectively lower temperature). 7.4.3.2 Additional functionalities for smart metering applications 7.4.3.2.1 Internal clock as control quantity It shall be shown that the deviation from the official legal time during the whole estimated durability period does not exceed the optional values given in EN 1434-1:2015, 5.10.5.1, means less than 1 h/year or less than 6 min or less than 7 s, by verifying the accuracy for setting the legal time or calculated evidence of deviation by the characteristics of the crystal frequency depending on e.g. temperature and time. By test for the accuracy of periodic interval registers for billing periods (e.g. hourly, daily, weekly or monthly registers), it shall be shown that the time deviation is not more than 1 % of the regarded period. This correct function of time as control quantity shall be tested at least three points of time within an appropriate period (e.g. 24 h), at a defined date. 7.4.3.2.2
External digital signal as control quantity By tests of each additional register depending on the specific digital trigger signal (switching on/off), the correct activation of the specific additional accumulation register shall be proved. 7.4.3.2.3 Absolute temperature as control quantity 7.4.3.2.3.1 Single temperature sensor The compliance with the permissible error of the temperature sensor of ± 0,7 K compared to the performance curve according to EN 60751, including the signal cables thereof, shall be tested for each temperature sensor at three typical temperature points for field applications (e.g. 10 °C; 30 °C; 50 °C). 7.4.3.2.3.2 Calculator The compliance with the permissible error on temperature indication of the inlet and outlet temperatures compared to the correct value of the absolute temperature of ± 0,3 K shall be tested. This test shall be examined in relation to the value of the threshold temperature S used for activating the specific additional accumulation register at the range of SIST EN 1434-4:2016

Figure 1 — Basic wear test cycles with magnification of the first cycle The 100 continuous load changes are estimated for a durability period of 5 years. The durability period is scalable by its number of load cycles. Water quality is explained according to CEN/TR 16911. 7.8.2.3 Additional test The additional endurance test for long-life flow sensors shall have a duration of 500 h at a continuous flow rate equal to qs and at the upper limit of the temperature range. The additional test is estimated for an additional durability period of 5 years. The durability period is scalable by its number of hours. Water quality is explained according to CEN/TR 16911. Tolerance: 0s5q%− After the test the error of indication shall be determined at the flow rates stated in 7.4.2 (for the flow sensor) at: For heating applications (50 ± 5) °C or at ()0max5θ− °C if max < 50 °C. For cooling applications (15 ± 5) °C No significant error shall occur. 7.8.2.4 Accelerated Durability test To accelerate the test procedure the samples may be weared alternatively by 4 000 continuous load change cycles; flow sensors with moving mechanical parts with flow rate load changes shall be raised SIST EN 1434-4:2016
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