Device for regulating a burner system with at least one burner, and with at least one ionisation electrode, which is disposed so that, when the burner system is operating, it lies in the area of a flame of the at least one burner, wherein the regulation device is embodied, on the basis of the at least one ionisation electrode, to record an ionisation current, wherein the regulation device is embodied to set an air volume flow rate of the burner system, taking into account the ionisation current, wherein the regulation device comprises a memory and is embodied to store pairs consisting of air volume flow rate of the burner system and ionisation current, wherein the regulation device is embodied to form a difference between the reciprocal value of a first ionisation current ( I neighborBk) and a first air volume flow rate and a reciprocal value of a second ionisation current ( I neighborB0), which was recorded at a point in time before the first ionisation current ( I neighborBk) and belongs to the first air volume flow rate or essentially belongs to the first air volume flow rate, wherein the regulation device is embodied, as the sum of this difference and of the reciprocal value of a further ionisation current ( I B0), to calculate the reciprocal value and the value of a displaced ionisation current ( I Bk ↑), characterised in that the regulation device is embodied to filter the reciprocal value or the value of the displaced ionisation current ( I Bk ↑), using a filter constant on the reciprocal value or value of a historical ionisation current which was recorded at a point in time before the first ionisation current ( I neighborBk) and belongs to the second air volume flow rate or essentially belongs to the second air volume flow rate, so that, as a result of the filtering, a filtered ionisation current and its reciprocal value are calculated, wherein the further ionisation current ( I B0) and the displaced ionisation current ( I Bk ↑) belong to a second air volume flow rate of the burner system, which is different from the first air volume flow rate of the burner system and the second ionisation current ( I neighborB0) was recorded under laboratory conditions at a new or minimally aged ionisation electrode. wherein the regulation device is embodied, on the basis of the at least one ionisation electrode, to record an ionisation current, wherein the regulation device is embodied to set an air volume flow rate of the burner system, taking into account the ionisation current, wherein the regulation device comprises a memory and is embodied to store pairs consisting of air volume flow rate of the burner system and ionisation current, wherein the regulation device is embodied to form a difference between the reciprocal value of a first ionisation current ( I neighborBk) and a first air volume flow rate and a reciprocal value of a second ionisation current ( I neighborB0), which was recorded at a point in time before the first ionisation current ( I neighborBk) and belongs to the first air volume flow rate or essentially belongs to the first air volume flow rate, wherein the regulation device is embodied, as the sum of this difference and of the reciprocal value of a further ionisation current ( I B0), to calculate the reciprocal value and the value of a displaced ionisation current ( I Bk ↑), characterised in that the regulation device is embodied to filter the reciprocal value or the value of the displaced ionisation current ( I Bk ↑), using a filter constant on the reciprocal value or value of a historical ionisation current which was recorded at a point in time before the first ionisation current ( I neighborBk) and belongs to the second air volume flow rate or essentially belongs to the second air volume flow rate, so that, as a result of the filtering, a filtered ionisation current and its reciprocal value are calculated, wherein the further ionisation current ( I B0) and the displaced ionisation current ( I Bk ↑) belong to a second air volume flow rate of the burner system, which is different from the first air volume flow rate of the burner system and the second ionisation current ( I neighborB0) was recorded under laboratory conditions at a new or minimally aged ionisation electrode.