xmlns:atom="http://www.w3.org/2005/Atom" xmlns:atom="http://www.w3.org/2005/Atom"
The relevant essential requirements of Annex I, the specific requirements of this Annex and the conformity assessment procedures listed in this Annex, apply to measuring systems intended for the continuous and dynamic measurement of quantities (volumes or masses) of liquids other than water. If appropriate, the terms ‘volume, and L’ in this Annex can be read as: ‘mass and kg’.
The manufacturer shall specify the rated operating conditions for the instrument, in particular;
The flowrate range is subject to the following conditions:
the flowrate range of a measuring system shall be within the flowrate range of each of its elements, in particular the meter.
meter and measuring system:
Table 1 | ||
Specific measuring system | Characteristic of liquid | Minimum ratio of Qmax: Qmin |
---|---|---|
Fuel dispensers | Not Liquefied gases | 10: 1 |
Liquefied gases | 5: 1 | |
Measuring system | Cryogenic liquids | 5: 1 |
Measuring systems on pipeline and systems for loading ships | All liquids | Suitable for use |
All other measuring systems | All liquids | 4: 1 |
Temperature range;
Pressure range;
Density range;
Viscosity range.
Point 1.4 is without prejudice to the Member States’ obligations to require use of a temperature of either 15 °C in accordance with Article 12(2) of Council Directive 2003/96/EC of 27 October 2003 restructuring the Community framework for the taxation of energy products and electricity(1).
Accuracy Class | |||||
---|---|---|---|---|---|
0,3 | 0,5 | 1,0 | 1,5 | 2,5 | |
Measuring systems (A) | 0,3 % | 0,5 % | 1,0 % | 1,5 % | 2,5 % |
Meters (B) | 0,2 % | 0,3 % | 0,6 % | 1,0 % | 1,5 % |
Measured volume V | MPE |
---|---|
V < 0,1 l | 4 × value in Table 2, applied to 0,1 L |
0,1 l ≤ V < 0,2 l | 4 × value in Table 2 |
0,2 l ≤ V < 0,4 l | 2 × value in Table 2, applied to 0,4 L |
0,4 l ≤ V < 1 l | 2 × value in Table 2 |
1 l ≤ V < 2 l | Value in Table 2, applied to 2 L |
the absolute value of the MPE given in Table 2 or Table 3,
the absolute value of the MPE for the minimum measured quantity (Emin).
Condition 1
Emin shall fulfil the condition: Emin ≥ 2 R, where R is the smallest scale interval of the indication device.
Condition 2
Emin is given by the formula: , where:
MMQ is the minimum measured quantity,
A is the numerical value specified in line A of Table 2.
In the case of a converted indication the MPEs are as in line A of Table 2.
MPEs on converted indications due to a conversion device are equal to ± (A — B), A and B being the values specified in Table 2.
Parts of conversion devices that can be tested separately
MPEs on quantities of liquid indications applicable to calculation, positive or negative, are equal to one-tenth of the MPEs as defined in line A of Table 2.
Associated measuring instruments shall have an accuracy at least as good as the values in Table 4:
MPE on Measurements | Accuracy classes of the measuring system | ||||
---|---|---|---|---|---|
0,3 | 0,5 | 1,0 | 1,5 | 2,5 | |
Temperature | ± 0,3 °C | ± 0,5 °C | ± 1,0 °C | ||
Pressure | Less than 1 MPa: ± 50 kPa From 1 to 4 MPa: ± 5 % Over 4 MPa: ± 200 kPa | ||||
Density | ± 1 kg/m3 | ± 2 kg/m3 | ± 5 kg/m3 |
These values apply to the indication of the characteristic quantities of the liquid displayed by the conversion device.
The MPE for the calculation of each characteristic quantity of the liquid, positive or negative, is equal to two fifths of the value fixed in (b).
the change in the measurement result is not greater than the critical change value as defined in point 3.2, or
the indication of the measurement result shows a momentary variation that cannot be interpreted, memorised or transmitted as a measuring result. Furthermore, in the case of an interruptible system, this can also mean the impossibility to perform any measurement, or
the change in the measurement result is greater than the critical change value, in which case the measuring system shall permit the retrieval of the measuring result just before the critical change value occurred and cut off the flow.
After an appropriate test, taking into account the period of time estimated by the manufacturer, has been performed, the following criterion shall be satisfied:
The variation of the measurement result after the durability test, when compared with the initial measurement result, shall not exceed the value for meters specified in line B of table 2.
However, in the case of a self-service arrangement the scale intervals of the main indicating device on the measuring system and the scale intervals of the self-service device shall be the same and results of measurement shall not deviate one from another.
0,5 % for liquids other than potable liquids and for liquids of a viscosity not exceeding 1 mPa.s, or
1 % for potable liquids and for liquids of a viscosity exceeding 1 mPa.s.
However, the allowed variation shall never be smaller than 1 % of MMQ. This value applies in the case of air or gas pockets.
It shall not be possible to divert the measured quantity.
A measuring system shall either be provided with an emergency power supply device that will safeguard all measuring functions during the failure of the main power supply device or be equipped with means to save and display the data present in order to permit the conclusion of the transaction in progress and with means to stop the flow at the moment of the failure of the main power supply device.
a However, Member States may require measuring systems of accuracy class 0,3 or 0,5 when used for the levying of duties on mineral oils when (un)loading ships and rail and road tankers. | |
Note: However, the manufacturer may specify a better accuracy for a certain type of measuring system. | |
Accuracy Class | Types of Measuring system |
---|---|
0,3 | Measuring systems on pipeline |
0,5 | All measuring systems if not differently stated elsewhere in this Table, in particular:
|
1,0 | Measuring systems for liquefied gases under pressure measured at a temperature equal to or above – 10 °C |
Measuring systems normally in class 0,3 or 0,5 but used for liquids
| |
1,5 | Measuring systems for liquefied carbon dioxide |
Measuring systems for liquefied gases under pressure measured at a temperature below – 10 °C (other than cryogenic liquids) | |
2,5 | measuring systems for cryogenic liquids (temperature below – 153 °C) |
The metered quantity shall be displayed in millilitres, cubic centimetres, litres, cubic metres, grams, kilograms or tonnes.
The conformity assessment procedures referred to in Article 17 that the manufacturer can choose between are:
B + F or B + D or H1 or G.