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The relevant requirements of Annex I, the specific requirements of this Annex and the conformity assessment procedures listed in this Annex, apply to gas meters and volume conversion devices defined below, intended for residential, commercial and light industrial use.
Gas meter | An instrument designed to measure, memorise and display the quantity of fuel gas (volume or mass) that has passed it. |
Conversion device | A device fitted to a gas meter that automatically converts the quantity measured at metering conditions into a quantity at base conditions. |
Minimum flowrate (Qmin) | The lowest flowrate at which the gas meter provides indications that satisfy the requirements regarding maximum permissible error (MPE). |
Maximum flowrate (Qmax) | The highest flowrate at which the gas meter provides indications that satisfy the requirements regarding MPE. |
Transitional flowrate (Qt) | The transitional flowrate is the flowrate occurring between the maximum and minimum flowrates at which the flowrate range is divided into two zones, the ‘upper zone’ and the ‘lower zone’. Each zone has a characteristic MPE. |
Overload Flowrate (Qr) | The overload flowrate is the highest flowrate at which the meter operates for a short period of time without deteriorating. |
Base conditions | The specified conditions to which the measured quantity of fluid is converted. |
The manufacturer shall specify the rated operating conditions of the gas meter, taking into account:
Class | Qmax/Qmin | Qmax/Qt | Qr/Qmax |
---|---|---|---|
1,5 | ≥ 150 | ≥ 10 | 1,2 |
1,0 | ≥ 20 | ≥ 5 | 1,2 |
The gas meter shall be designed for the range of gases and supply pressures of the country of destination. In particular the manufacturer shall indicate:
the gas family or group;
the maximum operating pressure.
Class | 1,5 | 1,0 |
Qmin ≤ Q < Qt | 3 % | 2 % |
Qt ≤ Q ≤ Qmax | 1,5 % | 1 % |
The gas meter shall not exploit the MPEs or systematically favour any party.
the change in the measurement result is no greater than the critical change value as defined in point 3.1.3, or
the indication of the measurement result is such that it cannot be interpreted as a valid result, such as a momentary variation that cannot be interpreted, memorised or transmitted as a measuring result.
recover to operate within MPE, and
have all measurement functions safeguarded, and
allow recovery of all measurement data present just before the disturbance.
the quantity corresponding to half of the magnitude of the MPE in the upper zone on the measured volume;
the quantity corresponding to the MPE on the quantity corresponding to one minute at maximum flowrate.
Under installation conditions specified by the manufacturer, the effect of the flow disturbances shall not exceed one third of the MPE.
After an appropriate test, taking into account the period of time estimated by the manufacturer, has been performed, the following criteria shall be satisfied:
Editorial Information
X1 Substituted by Corrigendum to Directive 2014/32/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of measuring instruments (Official Journal of the European Union L 96 of 29 March 2014).
Metered quantity shall be displayed in cubic metre, or in kilogram.
A volume conversion device constitutes a sub-assembly when it is together with a measuring instrument with which it is compatible.
For a volume conversion device, the essential requirements for the gas meter shall apply, if applicable. In addition, the following requirements shall apply:
The manufacturer shall specify the base conditions for converted quantities.
0,5 % at ambient temperature 20 °C ± 3 °C, ambient humidity 60 % ± 15 %, nominal values for power supply;
0,7 % for temperature conversion devices at rated operating conditions;
1 % for other conversion devices at rated operating conditions.
The error of the gas meter is not taken into account.U.K.
The volume conversion device shall not exploit the MPEs or systematically favour any party.U.K.
Where a Member State imposes measurement of residential use, it shall allow such measurement to be performed by means of any Class 1,5 meter, and by Class 1,0 meters which have a Qmax/Qmin ratio equal or greater than 150.
Where a Member State imposes measurement of commercial and/or light industrial use, it shall allow such measurement to be performed by any Class 1,5 meter.]
As regards the requirements under points 1.2 and 1.3, Member States shall ensure that the properties be determined by the utility or the person legally designated for installing the meter, so that the meter is appropriate for the accurate measurement of consumption that is foreseen or foreseeable.
The conformity assessment procedures referred to in Article 17 that the manufacturer can choose between are
B + F or B + D or H1.