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Division DEFINITIONS

United Kingdom

Original text. Later amendments are not shown.

MeterAn instrument designed to measure continuously, memorise and display the quantity at metering conditions of liquid flowing through the measurement transducer in a closed, fully charged conduit.
CalculatorA part of a meter that receives the output signals from the measurement transducer(s) and possibly, from associated measuring instruments and displays the measurement results.
Associated measuring instrumentAn instrument connected to the calculator for measuring certain quantities which are characteristic of the liquid, with a view to make a correction and/or conversion.
Conversion Device

A part of the calculator which by taking account of the characteristics of the liquid (temperature, density, etc.) measured using associated measuring instruments, or stored in a memory, automatically converts:

  • the volume of the liquid measured at metering conditions into a volume at base conditions and/or into mass, or

  • the mass of the liquid measured at metering conditions into a volume at metering conditions and/or into a volume at base conditions

Note:

A conversion device includes the relevant associated measuring instruments.

Base conditionsThe specified conditions to which the measured quantity of liquid at metering conditions is converted.
Measuring SystemA system that comprises the meter itself and all devices required to ensure correct measurement or intended to facilitate the measuring operations.
Fuel dispenserA measuring system intended for the refuelling of motor vehicles, small boats and small aircraft.
Self-service arrangementAn arrangement that allows the customer to use a measuring system for the purpose of obtaining liquid for his own use.
Self-service deviceA specific device that is part of a self-service arrangement and which allows one of more measuring systems to perform in this self-service arrangement.
Minimum measured quantity (MMQ)The smallest quantity of liquid for which the measurement is metrologically acceptable for the measuring system.
Direct indication

The indication, either volume or mass, corresponding to the measure and that the meter is physically capable of measuring.

Note:

The direct indication may be converted into another quantity using a conversion device.

Interruptible/non-interruptibleA measuring system is considered as interruptible/non-interruptible when the liquid flow can/cannot be stopped easily and rapidly.
Flowrate rangeThe range between the minimum flowrate (Qmin) and maximum flowrate (Qmax).