Division DEFINITIONS
United Kingdom
| 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. |