Method for operating a device for the dosed supply of a liquid

A method for operating a device for a dosed supply of a liquid, at least having

• at least one pump configured to deliver the liquid, the at least one pump having a pump housing defining a generally circular space with at least one inlet and at least one outlet, wherein an eccentric is coaxially arranged inside the pump housing and a deformable diaphragm is coaxially arranged between the pump housing and the eccentric, wherein the deformable diaphragm and the pump housing delimit at least one generally circular delivery path from the at least one inlet to the at least one outlet and form at least one seal of the at least one delivery path, wherein the at least one seal is displaceable along the at least one delivery path by way of a movement of the eccentric to deliver the liquid, and at least one pressure sensor connected to the at least one outlet of the pump, wherein the method comprises:
• a) delivering the liquid using the at least one pump;
• b) monitoring, during the delivery, a temporal pressure profile at the at least one outlet of the pump using the at least one pressure sensor;
• and
• c) establishing an angle position of the eccentric along the generally circular delivery path of the at least one pump based at least in part on at least one characteristic feature of the temporal pressure profile at the at least one outlet.