Centrifugal pump

A centrifugal pump including a pump shaft, a pump casing enclosing at least one pump stage with an impeller mounted on an internal part of the pump shaft and fixed to the pump shaft for rotation with the pump shaft, a flow measuring device configured to measure a delivery flow through the centrifugal pump by a turbine wheel arranged in the pump casing rotationally about the pump shaft and rotationally in relation to the pump shaft, the turbine wheel being exposed to the delivery flow through the centrifugal pump, the turbine wheel including at least one permanent magnet, the flow measuring device including at least one magnetic flux sensor, the flow measuring device being configured to measure the delivery flow on a basis of at least a first measurement signal generated by the at least one magnetic flux sensor as a result of a rotation of the turbine wheel, and the at least one magnetic flux sensor being arranged in a sensor housing-mounted in an opening formed in an outer wall of the pump casing, wherein that a rotatable disc is mounted on the pump shaft and fixed to the pump shaft for rotation with the pump shaft, wherein the rotatable disc includes at least one permanent magnet, and wherein the flow measuring device is configured to include in a measurement of the delivery flow a second measurement signal generated by the at least one magnetic flux sensor as a result of the rotation of the rotatable disc.