Gas conveying unit, system consisting of a gas conveying unit and a water separating device, and fuel cell system

A system (40) comprising a gas conveying unit (10) having

• a first flow inlet (11a) for admitting anode exhaust gas (A) into the gas conveying unit (10);
• a flow outlet (12) for discharging anode exhaust gas (A) out of the gas conveying unit (10), wherein the first flow inlet (11a) can be fluidically connected to a first flow outlet (22a) of a water separating device (20);
• a sensor device paired with the gas conveying unit (10), wherein the gas conveying unit (10) comprises a controller, which is configured to evaluate sensor signals of the sensor device in order to determine the characteristic variable of the gas conveying unit (10) by means of a target value/actual value comparison and determine a fill level of the water separating device (20) on the basis of the determined characteristic variable of the gas conveying unit (10), wherein the characteristic variable of the gas conveying unit (10) represents an operating behavior of the gas conveying unit (10) during conveyance of anode exhaust gas;
• and
• a water separating device (20), wherein the water separating device (20) comprises a reservoir (23) for collecting deposited liquid water (LW) from an anode exhaust gas (A) and a controllable valve for flow control of collected liquid water (LW) from the reservoir (23), wherein the water separating device (20) is coupled to the gas conveying unit (10) such that the first flow outlet (22a) of the water separating device (20) is connected to the first flow inlet (11a) of the gas conveying unit (10).