Method for detecting metal (150, 350) in an inner area (145, 535) of a casting mould during a casting process, the casting mould comprising several mould elements (530, 540, 550) defining several inner areas (535, 545) to be filled with liquid metal during the casting process, wherein a plurality of eddy current probe assemblies (110, 310, 320, 330, 510, 520) are positioned outside the inner area (145, 535) of the casting mould and wherein each of the plurality of eddy current probe assemblies (110, 310, 320, 330, 510, 520) is arranged at a predefined position with respect to the respective non-conductive mould material (340,530) of the casting mould so as to detect metal in a predefined region of the casting mould, the method comprising - exciting at least one eddy current probe assembly of the plurality of eddy current probes (110, 310, 320, 330, 510, 520) such that each of the at least one eddy current probe assembly (110, 310, 320, 330, 510, 520) generates a primary magnetic field passing through non-conductive mould material (140, 340, 530) of the casting mould to the inner area (145, 535) of the casting mould, - providing at each of the at least one eddy current probe assemblies (110, 310, 320, 330, 510,520) a signal indicative of a secondary magnetic field (128, 128') detected by the respective eddy current probe assembly (110, 310, 320, 330, 510, 520), the secondary magnetic field (128, 128') caused by eddy currents (125, 125') induced in metal (150,350) in the inner area (145, 535), and - detecting metal (150, 350) in the casting mould based on said at least one signal, - adjusting the filling rate of the liquid metal (150, 350) based on detected metal in the casting mould, characterized in that adjusting the filling rate comprises adjusting the filling rate in accordance with a filling rate value associated with a predefined eddy current probe assembly (110, 310, 320, 330, 510, 520) when metal (150, 350) is newly detected based on the signal of this predefined eddy current probe assembly (110, 310, 320, 330, 510, 520), wherein each of the predefined regions of one of the plurality of eddy current probe assemblies (110, 310, 320, 330, 510, 520) is associated with a respective filling rate value of liquid metal, wherein a mould element of the several mould elements (530, 540,550) is formed of non-conductive mold material and comprises recesses, each of the recesses being configured to receive a respective eddy current probe assembly (510, 520) of the plurality of eddy current probe assemblies (110, 310, 320, 330, 510, 520). - exciting at least one eddy current probe assembly of the plurality of eddy current probes (110, 310, 320, 330, 510, 520) such that each of the at least one eddy current probe assembly (110, 310, 320, 330, 510, 520) generates a primary magnetic field passing through non-conductive mould material (140, 340, 530) of the casting mould to the inner area (145, 535) of the casting mould, - providing at each of the at least one eddy current probe assemblies (110, 310, 320, 330, 510,520) a signal indicative of a secondary magnetic field (128, 128') detected by the respective eddy current probe assembly (110, 310, 320, 330, 510, 520), the secondary magnetic field (128, 128') caused by eddy currents (125, 125') induced in metal (150,350) in the inner area (145, 535), and - detecting metal (150, 350) in the casting mould based on said at least one signal, - adjusting the filling rate of the liquid metal (150, 350) based on detected metal in the casting mould,