Gas meters - Rotary displacement meters

This European Standard specifies ranges, construction, performances, output characteristics and testing of rotary displacement gas meters (hereinafter referred to as RD meters or simply meters) for gas volume measurement.
This European Standard applies to rotary displacement gas meters used to measure the volume of at least fuel gases of the 1st, 2nd and 3rd gas families, the composition of which is specified in EN 437, at a maximum working pressure up to and including 20 bar over an ambient and gas temperature range of at least -10 °C to + 40 °C.
This standard applies to meters that are installed in locations with vibration and shocks of low significance (class M1 according to MID) and in
-   closed locations (indoor or outdoor with protection as specified by the manufacturer) with condensing or with non-condensing humidity
or, if specified by the manufacturer,
-   open locations (outdoor without any covering) with condensing humidity or with non-condensing humidity.
For use in open location, the meters shall fulfil the specification in annex G
and in locations with electromagnetic disturbances.
Unless otherwise specified in this standard:
-   all pressures used are gauge;
-   all influence quantities, except the one under test, are kept relatively constant at their reference value.
This standard also applies to meters with a maximum allowable pressure PS and the volume V of less than 6 000 bar ž litres or with a product of PS and DN of less than 3 000 bar, as defined by EU directive 97/23/EC.  
The risk philosophy adopted in this standard is based on the analysis of hazards on account of pressure. The standard applies principles to eliminate or reduce hazards. Where these hazards cannot be eliminated appropriate protection measures are specified.
Any residual hazard identified has to be communicated to the user where appropriate.
Depending on the installation situation additional requirements may apply to cover the risks arising from traffic, wind, earthqua

Gaszähler - Drehkolbengaszähler

Diese Europäische Norm legt den Einsatzbereich, den Bau, den Betrieb, die Ausgabecharakteristiken und die
Prüfung von Drehkolbengaszählern (nachfolgend RD-Zähler oder einfach nur Zähler genannt) für die Gasvolumenmessung
fest.
Diese Europäische Norm gilt für Drehkolbengaszähler, die wenigstens für die Volumenmessung von Brenngasen
der 1., 2. und 3. Gasfamilie, deren Zusammensetzung in EN 437 beschrieben ist, bei einem maximalen
Betriebsdruck bis einschließlich 20 bar in einem Umgebungs- und Gastemperaturbereich von mindestens
−10 °C bis +40 °C eingesetzt werden.
Die vorliegende Norm gilt für Zähler, die an Standorten eingebaut sind, an denen unbedeutende Schwingungen
und Erschütterungen auftreten können (Kategorie M1 nach MID), sowie an
⎯ geschlossenen Standorten (innen oder außen mit dem vom Hersteller vorgeschriebenen Schutz) mit oder
ohne Betauung,
oder, bei entsprechender Angabe durch den Hersteller,
⎯ offenen Standorten (außen ohne Abdeckung) mit oder ohne Betauung,
Für die Verwendung an offenen Standorten müssen die Zähler die Anforderungen in Anhang G erfüllen
sowie an Standorten mit elektromagnetischen Störungen.
Soweit in dieser Norm nicht anders angegeben:
⎯ sind alle dargestellten Drücke als Überdrücke zu verstehen;
⎯ werden alle Einflussgrößen außer der geprüften Einflussgröße relativ konstant bei ihrem Referenzwert
gehalten.
Diese Norm gilt auch für Zähler mit einem maximal zulässigen Druck PS und Volumen V von weniger als
6 000 bar ⋅ Liter oder mit einem Produkt aus PS und DN von weniger als 3 000 bar, wie in der EU-Richtlinie
97/23/EG festgelegt.

Compteurs de gaz - Compteurs à pistons rotatifs

La présente Norme européenne spécifie les gammes, construction, performances, caractéristiques de sortie et essais des compteurs de mesure de volume de gaz à pistons rotatifs (appelés ci-après simplement compteurs).
La présente Norme européenne s'applique aux compteurs de gaz à pistons rotatifs utilisés pour mesurer au moins le volume de gaz des 1ère, 2ème et 3ème familles, dont la composition est spécifiée dans l’EN 437, à une pression d'utilisation maximum jusqu’à 20 bar et pour une gamme de température ambiante et de température du gaz au moins comprise entre - 10 °C et + 40 °C.
La présente norme s'applique aux compteurs installés dans des endroits soumis à des vibrations et chocs peu significatifs (catégorie M1 conformément à la directive sur les instruments de mesure) et dans
-   des lieux fermés (intérieur ou extérieur avec une protection spécifiée par le fabricant) avec ou sans condensation de l'humidité
ou, en cas de spécification du fabricant,
-   des lieux ouverts (extérieur sans protection) avec ou sans condensation de l'humidité.
Lorsqu'ils sont utilisés dans des lieux ouverts, les compteurs doivent satisfaire aux spécifications de l'Annexe G
et dans des lieux présentant des perturbations électromagnétiques.
Sauf indications contraires spécifiées dans la présente norme :
-   toutes les pressions utilisées sont des pressions relatives ;
-   toutes les quantités influentes, à l’exception de celle soumise à l’essai, sont maintenues relativement constantes par rapport à la valeur de référence.
La présente norme s’applique également aux compteurs dont le produit de la pression maximale admissible PS par le volume V est inférieur à 6 000 bar litres ou dont le produit PS.DN est inférieur à 3 000 bar, conformément à la définition donnée par la Directive UE 97/23/CE.
La philosophie du risque adoptée dans la présente norme s’appuie sur l’analyse des dangers représentés par la pression.

Plinomeri - Rotacijski plinomeri

General Information

Status
Not Published
Current Stage
4098 - Decision to abandon - Enquiry
Due Date
09-Dec-2011
Completion Date
09-Dec-2011

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SLOVENSKI STANDARD
oSIST prEN 12480:2010
01-december-2010
Plinomeri - Rotacijski plinomeri
Gas meters - Rotary displacement meters
Compteurs de gaz - Compteurs de gaz à déplacement rotatif
Compteurs de gaz - Compteurs à pistons rotatifs
Ta slovenski standard je istoveten z: prEN 12480
ICS:
91.140.40 Sistemi za oskrbo s plinom Gas supply systems
oSIST prEN 12480:2010 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 12480:2010
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oSIST prEN 12480:2010
EUROPEAN STANDARD
DRAFT
prEN 12480 rev
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2010
ICS 91.140.40 Will supersede EN 12480:2002
English Version
Gas meters - Rotary displacement meters

Compteurs de gaz - Compteurs à pistons rotatifs Compteurs de gaz - Compteurs de gaz à déplacement

rotatif

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 237.

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 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,

Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

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
Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12480 rev:2010: E

worldwide for CEN national Members.
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oSIST prEN 12480:2010
prEN 12480:2010 (E)
Contents Page

Foreword ..............................................................................................................................................................5

1 SCOPE ....................................................................................................................................................5

2 NORMATIVE REFERENCES ..................................................................................................................6

3 TERMINOLOGY ......................................................................................................................................7

3.1 Terms and definitions ...........................................................................................................................7

3.2 Symbols ..................................................................................................................................................9

4 WORKING RANGE .............................................................................................................................. 10

4.1 General ................................................................................................................................................. 10

4.2 Flow rate range ................................................................................................................................... 10

4.3 Pressure range .................................................................................................................................... 11

4.4 Temperature range ............................................................................................................................. 11

5 METROLOGICAL PERFORMANCE ................................................................................................... 11

5.1 Error of indication ............................................................................................................................... 11

5.1.1 Requirements ...................................................................................................................................... 11

5.1.2 Test ....................................................................................................................................................... 13

5.2 Pressure loss ...................................................................................................................................... 13

5.2.1 Requirements ...................................................................................................................................... 13

5.2.2 Test ....................................................................................................................................................... 13

5.3 Metrological repeatability ................................................................................................................... 14

5.3.1 Requirements ...................................................................................................................................... 14

5.3.2 Test ....................................................................................................................................................... 14

5.4 Working pressure ............................................................................................................................... 14

5.4.1 Requirements ...................................................................................................................................... 14

5.4.2 Conformity assessment ..................................................................................................................... 14

5.4.3 Individual test ...................................................................................................................................... 14

5.5 Working temperature range ............................................................................................................... 15

5.6 Condensing ambient conditions ....................................................................................................... 16

5.6.1 Requirements ...................................................................................................................................... 16

5.6.2 Test ....................................................................................................................................................... 16

5.7 Bidirectional meters ........................................................................................................................... 16

5.7.1 Requirements ...................................................................................................................................... 16

5.7.2 Conformity assessment ..................................................................................................................... 16

5.8 Influence of oil filling .......................................................................................................................... 16

5.8.1 Requirements ...................................................................................................................................... 16

5.8.2 Tests ..................................................................................................................................................... 16

6 DESIGN AND MANUFACTURING ...................................................................................................... 17

6.1 General ................................................................................................................................................. 17

6.2 Material ................................................................................................................................................ 17

6.2.1 General ................................................................................................................................................. 17

6.2.2 Resistance to external corrosion ...................................................................................................... 17

6.2.3 Penetration resistance ....................................................................................................................... 17

6.2.4 Adhesion of the protective coating................................................................................................... 19

6.2.5 Materials for pressurized parts ......................................................................................................... 19

6.2.6 Strength of housings .......................................................................................................................... 20

6.3 Robustness ......................................................................................................................................... 21

6.3.1 Resistance to internal pressure ........................................................................................................ 21

6.3.2 Fire resistance ..................................................................................................................................... 23

6.3.3 External leak tightness ....................................................................................................................... 23

6.3.4 Overload .............................................................................................................................................. 23

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6.3.5 Bending and torsional moment ......................................................................................................... 24

6.4 Transportation and storage ................................................................................................................ 26

6.4.1 Protection against foreign matter ...................................................................................................... 26

6.4.2 Protection against damage................................................................................................................. 26

6.5 Connections ......................................................................................................................................... 27

6.6 Pressure and temperature tappings .................................................................................................. 28

6.6.1 Pressure tappings ............................................................................................................................... 28

6.6.2 Temperature tappings ......................................................................................................................... 28

6.7 Manufacturing ...................................................................................................................................... 28

7 METER OUTPUT .................................................................................................................................. 29

7.1 Index ..................................................................................................................................................... 29

7.1.1 General ................................................................................................................................................. 29

7.1.2 Magnetic coupling ............................................................................................................................... 29

7.1.3 Mechanical indicating device ............................................................................................................. 30

7.1.4 Test element ......................................................................................................................................... 30

7.2 Index window ....................................................................................................................................... 31

7.2.1 General ................................................................................................................................................. 31

7.2.2 Requirements ....................................................................................................................................... 31

7.2.3 Tests ..................................................................................................................................................... 32

7.3 Output drive shafts .............................................................................................................................. 32

7.3.1 Requirements ....................................................................................................................................... 32

7.3.2 Tests ..................................................................................................................................................... 34

7.4 Pulse generators ................................................................................................................................. 34

7.4.1 General ................................................................................................................................................. 34

7.4.2 Specification for low frequency pulse generator ............................................................................. 35

7.4.3 Specification for high frequency pulse generator ........................................................................... 35

7.4.4 Electrical Connection .......................................................................................................................... 35

8 DURABILITY ......................................................................................................................................... 35

8.1 Requirements ....................................................................................................................................... 35

8.2 Tests ..................................................................................................................................................... 36

9 MARKING.............................................................................................................................................. 36

9.1 General ................................................................................................................................................. 36

9.2 Direction of flow .................................................................................................................................. 37

9.3 Pressure tappings ............................................................................................................................... 37

9.4 Durability and legibility of marking ................................................................................................... 37

9.4.1 Requirements ....................................................................................................................................... 37

9.4.2 Indelibility test ..................................................................................................................................... 37

10 DOCUMENTATION ............................................................................................................................... 37

10.1 Documentation related to the manufacturer's tests ........................................................................ 37

10.2 Declaration of conformity ................................................................................................................... 37

10.3 Instruction manual .............................................................................................................................. 37

Annex A (normative) Conformity assessment tests .................................................................................... 39

Annex B (normative) Individual meter testing .............................................................................................. 42

Annex C (normative) Resistance to high temperature (optional) ................................................................ 43

C.1 Requirements ....................................................................................................................................... 43

C.2 Test ....................................................................................................................................................... 43

C.2.1 Apparatus ............................................................................................................................................. 43

C.2.2 Test conditions .................................................................................................................................... 43

C.2.3 Test procedure ..................................................................................................................................... 44

C.3 Marking ................................................................................................................................................. 45

Annex D (informative) Compliance evaluation for gas meters ..................................................................... 46

D.1 Quality Management System.............................................................................................................. 46

D.1.1 General ................................................................................................................................................. 46

D.1.2 Requirement ......................................................................................................................................... 46

D.1.3 Final assessment ................................................................................................................................. 46

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Annex E (normative) Non destructive testing (NDT) .................................................................................... 47

Annex F (informative) Materials for pressurized parts ................................................................................. 50

Annex G (normative) Additional tests for meters to be used in open locations ....................................... 58

G.1 Weathering .......................................................................................................................................... 58

G.1.1 Requirements ...................................................................................................................................... 58

G.1.2 Test ....................................................................................................................................................... 58

Annex H (normative) Meter family .................................................................................................................. 59

H.1 Definition of meter family ................................................................................................................... 59

Annex ZA (informative) Relationship to MID ................................................................................................. 60

Annex ZB (informative) Relationship to PED ................................................................................................ 65

Bibliography ..................................................................................................................................................... 70

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oSIST prEN 12480:2010
prEN 12480:2010 (E)
Foreword

This document (prEN 12480:2010) has been prepared by Technical Committee CEN/TC 237 “Gas meters”,

the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12480:2002.

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(s).

For relationship with EU Directives, see informative Annex ZA and ZB, which are an integral part of this

document.
1 SCOPE

This European Standard specifies ranges, construction, performances, output characteristics and testing of

rotary displacement gas meters (hereinafter referred to as RD meters or simply meters) for gas volume

measurement.

This European Standard applies to rotary displacement gas meters used to measure the volume of at least

fuel gases of the 1st, 2nd and 3rd gas families, the composition of which is specified in EN 437, at a maximum

working pressure up to and including 20 bar over an ambient and gas temperature range of at least– 10 °C to

+ 40 °C.

This standard applies to meters that are installed in locations with vibration and shocks of low significance

(class M1 according to MID) and in

 closed locations (indoor or outdoor with protection as specified by the manufacturer) with

condensing or with non-condensing humidity
or, if specified by the manufacturer,

 open locations (outdoor without any covering) with condensing humidity or with non-condensing

humidity.
For use in open location, the meters shall fulfil the specification in annex G
and in locations with electromagnetic disturbances.
Unless otherwise specified in this standard:
 all pressures used are gauge;

 all influence quantities, except the one under test, are kept relatively constant at their reference

value.
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oSIST prEN 12480:2010
prEN 12480:2010 (E)

This standard also applies to meters with a maximum allowable pressure PS and the volume V of less than

6 000 bar x litres or with a product of PS and DN of less than 3 000 bar, as defined by EU directive 97/23/EC.

The risk philosophy adopted in this standard is based on the analysis of hazards on account of pressure. The

standard applies principles to eliminate or reduce hazards. Where these hazards cannot be eliminated

appropriate protection measures are specified.

Any residual hazard identified has to be communicated to the user where appropriate.

Depending on the installation situation additional requirements may apply to cover the risks arising from

traffic, wind, earthquake loading and external fire.

This European Standard is primarily written to address metrological aspects and conformity assessment of

RD meters. This standard clearly identifies in annex ZA and ZB which clauses are specific to the metrological

or pressure containing requirements, or those that are applicable to both. As well as providing conformity

assessment requirements, this standard provides requirements that shall be fulfilled prior to delivery of the

product, i.e. Individual meter testing.
2 NORMATIVE REFERENCES

This European Standard incorporates by dated or undated references provisions from other publications.

These normative references are cited at the appropriate places in the text, and the publications are listed

hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to

this European Standard only when incorporated in it by amendment or revision. For undated references the

latest edition of the publication referred to applies (including amendments).
EN 437, Test gas - Test pressures – Appliance categories
EN 10204, Metallic products - Types of inspection documents
EN 12405, Gas-volume electronic conversion devices
EN 12156-3, Valves – Shell design strength – Part 3: Experimental method

EN 60079-0:2007, Electrical apparatus for explosive gas atmospheres - General requirements

EN 60079-11:2007, Equipment protection by intrinsic safety "i"

EN 60947-5-6, Low voltage switchgear and controlgear – Part 5-6: Control circuit devices and switching

elements – DC interface for proximity sensors and switching amplifiers (NAMUR) (IEC 60947-5-6:1999)

EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989)

EN 60730-1:1995, Automatic electrical controls for household and similar use - Part 1: General requirements

(IEC 60730-1:1993, modified)

ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimension,

tolerances and designation

ISO 834-1, Fire resistance tests – Elements of building construction – Part 1: General requirements

ISO 1518: 2009, Paints and varnishes — Scratch test

ISO 2768-1, General tolerances – Part 1: Tolerances for linear and angular dimensions without individual

tolerance indications
ISO 7005-1, Metallic flanges - Part1: Steel flanges
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oSIST prEN 12480:2010
prEN 12480:2010 (E)
ISO 7005-2, Metallic flanges - Part2: Cast iron flanges
3 TERMINOLOGY
3.1 Terms and definitions

For the purposes of this European Standard, the following terms and definitions apply:

3.1.1 actual flow rate

flow, at the pressure and temperature conditions prevailing in the gas distribution line in which the meter is

fitted
3.1.2 Accuracy class 1,0

meter which has an error of indication between –2 % and + 2 % for flow rates Q where Q ≤ Q < Q , and

min t
between –1 % and +1 % for flow rates Q where Q ≤ Q ≤ Q
t max
3.1.3 base conditions

fixed conditions to which a volume of gas is converted, having been initially measured at prevailing

metering conditions
3.1.4 cyclic volume
volume of the gas measured by one complete revolution of the element(s)
3.1.5 density of gas
the mass of gas divided by the volume
3.1.6 design temperature range (TS)

range of temperatures for which the meter is designed as specified by the manufacturer and marked on the

meter
3.1.7 diameter
nominal size of diameter
3.1.8 error of indication

value which shows the relationship in percentage terms of the difference between the volume indicated

by the meter and the volume which has actually flowed through the meter, to the latter value :

where
V V
i c
E = ⋅ 100

V is the indicated volume and V is the volume which has actually flowed through the meter

i c
a pressure of (1 013,25 ±100) mbar and temperature of (20 ±0.5) °C
3.1.9 maximum allowable pressure (PS)

maximum pressure for which the meter is designed as specified by the manufacturer

3.1.10 minimum flow rate Qmin

lowest flowrate at which the gas meter provides indications that satisfy the requirements regarding

maximum permissible error (MPE)
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oSIST prEN 12480:2010
prEN 12480:2010 (E)
3.1.11 maximum flowrate Qmax

highest flow rate at which the gas meter provides indications that satisfy the requirements regarding

maximum permissible error (MPE)
3.1.12 meter family

A meter family in respect to the conformity assessment is a group of meters of different sizes but with similar

construction (see Annex H). By specifying a meter family it is possible to reduce the number of tests and

documents during assessment
3.1.13 metering conditions
conditions of the gas prevailing at the point of measurement
3.1.14 metering pressure (p )
absolute pressure at which the volume of the gas is measured
3.1.15 normal conditions of use
conditions referring to the meter operating :
 within the range of working pressure
 within the operational temperature and gas temperature range
 with the distributed gas
3.1.16 operating pressure range

limits of working pressure, as marked on the meter, for which the meter will continue to operate within its

metrological characteristics as declared by the manufacturer
3.1.17 operating temperature range

range of temperatures for which the meter satisfies the metrological requirements of this standard

3.1.18 overload flowrate Q

the highest flowrate at which the meter operates for a short period of time without

deteriorating
3.1.19 pressure loss

non-recoverable pressure drop caused by the presence of the meter in the pipeline

3.1.20 rotary displacement meter (RD meter)

gas volume meter in which a rigid measuring compartment is formed between the walls of a stationary

chamber and rotating element or elements. Each rotation of the element(s) displaces a fixed volume of

gas which is cumulatively registered and indicated by an indicating device. It is designed to measure,

memorize and display the volume of a fuel gas that has passed through it
3.1.21 specified conditions

condition of the gas at which the performance specifications of the meter are given

3.1.22 storage temperature range

range of temperatures at which the meter can be stored without being adversely affected

3.1.23 transitional flowrate Q
transitional flowrate, the flowrat
...

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