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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 (recast) (Text with EEA relevance)
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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 water meters intended for the measurement of volumes of clean, cold or heated water in residential, commercial and light industrial use.
Water Meter | An instrument designed to measure, memorise and display the volume at metering conditions of water passing through the measurement transducer. |
Minimum Flowrate (Q1) | The lowest flowrate at which the water meter provides indications that satisfy the requirements concerning the maximum permissible errors (MPEs.) |
Transitional Flowrate (Q2) | The transitional flowrate is the flowrate value occurring between the permanent 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. |
Permanent Flowrate (Q3) | The highest flowrate at which the water meter operates in a satisfactory manner under normal conditions of use, i.e. under steady or intermittent flow conditions. |
Overload Flowrate (Q4) | The overload flowrate is the highest flowrate at which the meter operates in a satisfactory manner for a short period of time without deteriorating. |
The manufacturer shall specify the rated operating conditions for the instrument, in particular:
The flowrate range of the water.
The values for the flowrate range shall fulfil the following conditions:
The temperature range of the water.
The values for the temperature range shall fulfil the following conditions:
0,1 °C to at least 30 °C, or
30 °C to at least 90 °C.
The meter may be designed to operate over both ranges.
The relative pressure range of the water, the range being 0,3 bar to at least 10 bar at Q3.
For the power supply: the nominal value of the AC voltage supply and/or the limits of DC supply.
2 % for water having a temperature ≤ 30 °C,
3 % for water having a temperature > 30 °C.
The meter shall not exploit the MPE or systematically favour any party.
The meter shall not exploit the MPE or systematically favour any party.
the change in the measurement result is no greater than the critical change value as defined in point 7.1.3, 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 volume corresponding to half of the magnitude of the MPE in the upper zone on the measured volume;
the volume corresponding to the MPE on the volume corresponding to one minute at flowrate Q3.
After an appropriate test, taking into account the period of time estimated by the manufacturer, has been performed, the following criteria shall be satisfied:
The variation of the measurement result after the durability test, when compared with the initial measurement result, shall not exceed:
3 % of the metered volume between Q1 included and Q2 excluded;
1,5 % of the metered volume between Q2 included and Q4 included.
The error of indication for the volume metered after the durability test shall not exceed:
± 6 % of the metered volume between Q1 included and Q2 excluded;
± 2,5 % of the metered volume between Q2 included and Q4 included for water meters intended to meter water with a temperature between 0,1 °C and 30 °C,
± 3,5 % of the metered volume between Q2 included and Q4 included for water meters intended to meter water with a temperature between 30 °C and 90 °C.
Water meters not designed to measure reverse flow shall either prevent reverse flow or shall withstand an accidental reverse flow without any deterioration or change in metrological properties.
The conformity assessment procedures referred to in Article 17 that the manufacturer can choose between are:
B + F or B + D or H1.
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