Method for determining the initial pressure in a pressurized gas tank to be filled from a dispensing station

A dispensing station for a pressurized gas tank, the dispensing station comprising:

• a filling line including, in series, a pressurized gas source, a heat exchanger, and a dispenser, the dispensing station also comprising a bypass line on the filling line that is configured to bypass the heat exchanger,
• wherein the filling line comprises a first circuit connecting the gas source to an inlet of the heat exchanger, the first circuit being provided with a pressure controller, and a second circuit connecting an outlet of the heat exchanger to the dispenser, the second circuit being provided with a second valve, and
• an electronic component configured to control a transfer of a gas flow from the gas source or the heat exchanger to the dispenser via the bypass line,
• wherein the electronic component is also configured to determine an initial pressure in the tank to be filled as a function of a pressure measured on the filling line.