A control device for determining an actual fuel turnover for a fuel cell arrangement, wherein the control device comprises:
- a voltage reception device for receiving values of a voltage applying over the fuel cell arrangement;
- a fuel flow setting device for setting a flow of fuel supplied or suppliable to the fuel cell arrangement and/or a current setting device for setting an electrical current output by the fuel cell arrangement;
- and
- a memory for storing calibration data corresponding to a relation between a fuel turnover of the fuel cell arrangement and a voltage applying over the fuel cell arrangement;
- wherein the control device is adapted to receive a first voltage value;
- to control, after reception of the first voltage value, a variation of the flow of fuel supplied to the fuel cell arrangement and/or the current output by the fuel cell arrangement;
- and
- to receive a second voltage value after the variation;
- and
- wherein the control device is further adapted to determine the actual fuel turnover of the fuel cell arrangement based on the first voltage value, the second voltage value, and the calibration data.