| 摘要 |
A method for calibrating a flow meter system in a fuel pump unit is presented. The fuel pump unit is configured to dispense a liquefied fuel gas at an superatmospheric operation pressure, where the method comprises the steps of a) passing a reference volume of calibration fluid through the flow meter system, b) registering the reference volume, by the flow meter system, as a registered volume, and c) comparing the registered volume with the reference volume to determine a correction function that compensates for the deviation of the registered volume from the reference volume. The method is further characterised in that a liquid is used as the calibration fluid, at steps a) and b) a calibration pressure is used that lies below the vapour pressure of said liquefied fuel gas, the correction function is modified to compensate for differences between the fluid properties of the calibration liquid at the calibration pressure and the fluid properties of the liquefied fuel gas at the operation pressure, and that the flow meter system is adjusted by the modified correction function such that its measured volume corresponds to the volume of liquefied fuel gas dispensed at operation pressure.
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