Patent ID: 11889972
Assignee: ALFRED KäRCHER SE & CO. KG
Field: Chemical engineering (Chemistry)
Classification: CPC A  B | IPC A  B

Claim 0:
1. A method for operating a suction device, said suction device comprising a suction unit, a controller implementing an evaluation unit, and a removable filtering device, wherein the suction unit generates a suction flow that flows through the filtering device when said filtering device is arranged on the suction device, said method comprising:
after the suction unit is started up, performing a check whether the filtering device is present, the check comprising:
accessing, by the evaluation unit, check data stored in a table of a storage device of the evaluation unit, or using, by the evaluation unit, an algorithm to compute the check data, the check data containing at least one threshold value or the algorithm defining the at least one threshold value, wherein the at least one threshold value includes a threshold value for switching off the suction unit, and wherein the at least one threshold value is a pressure value;
comparing, by the evaluation unit, an absolute pressure value to the pressure value;
generating and transmitting a switch-off signal from the evaluation unit to a switch of the controller if the absolute pressure value exceeds the pressure value thereby indicating that the filtering device is not present; and
switching off the suction unit,

wherein the pressure value is determined from measurements in which suction hoses of different diameters are attached to the suction device and the pressure value measurements are measured with the filtering device used and without using the filtering device.