Patent ID: 9404786
Filing Date: 2016-08-02
CPC Classification: B22D,G01F

Claim Text:
1. A device to detect the level of liquid metal (M) in a casting apparatus which comprises at least a crystallizer, wherein said crystallizer has lateral walls, or is of a tubular shape, and comprises an upper edge which, with respect to one of its inner corners, defines an open top through which the liquid metal (M) to be cast is discharged, wherein the device comprises a box-like structure associated in correspondence with the upper end of the crystallizer and extending along the aforesaid upper edge, for at least a part of said box-like structure's perimeter, said box-like structure having a peripheral cavity inside which, for at least a substantial part of a perimeter extension, at least a means is disposed, protruding at least partly toward the inside of said crystallizer, for the generation and detection of a variable magnetic field, wherein said generation and detection means extends for at least a segment thereof beyond said inner corner of the crystallizer so as to face directly into the open top of the crystallizer, said generation and detection means being suitable to generate a variable magnetic field (L) which is propagated at least partly in said liquid metal (M), in order to generate induced currents therein, and to detect a signal of a reaction magnetic field (K), generated by said induced currents, and to render said signal available to a command and control unit suitable to process said signal and to determine the level of liquid metal (M) present in the crystallizer.