Pump and method for controlling a pump

A computer program product comprising a non-transitory computer-readable medium storing a program including instructions for execution by an integrated control unit of a pump for pumping liquid containing solid matter and configured to be at least partly submerged in the liquid during operation of the pump, the pump comprising:

• a drive unit having an electric motor and a drive shaft;
• a hydraulic unit having an impeller connected to the electric motor via the drive shaft;
• and
• an integrated control unit operatively connected to the electric motor and configured for monitoring and controlling operation of the pump;
• an integrated pressure sensor having a fixed reference pressure value and operatively connected to the integrated control unit, the integrated control unit configured to determine a liquid level of the liquid surrounding the pump based on a relation between the actual value of the pressure sensor and the fixed reference pressure value;
• the instructions when executed by the integrated control unit integrated control unit, configure the pump to:
• initiate pumping with the pump,
• continue pumping until the liquid level of the liquid surrounding the pump is equal to a predetermined calibration level fixed in relation to the pump,
• determine a calibration level actual value of the pressure sensor when the liquid level of the liquid surrounding the pump is equal to the predetermined calibration level, and
• calibrate the pump by setting the fixed reference pressure value to a new reference value corresponding to the calibration level actual value.