Operation: Fluid is fed into an open bowl at the top and discharged through a centered port at the bottom. A float valve controls discharge so as to flood the working space and provide uniform, low velocity of flow through the matrix, where magnetic separation takes place.

When the separating chamber is magnetized, a safety valve is held open, permitting flow through the discharge port. If current is interrupted, the valve falls, closing the discharge port, to prevent contamination of the cleaned product.

Water cooled units (Models 241, 261, 461, 71 and 271) require continuous flow of clean, low dissolved solids cooling water at a maximum temperature of 32°C (95°F).

Magnetic Field intensity, field gradient and energy gradient. The F1 Series is designed for maximum economy consistent with effective separation of fine ferromagnetic particles. Background magnetizing fields measured in the empty separating chamber (with pole pieces but without the matrix in place) are approximately 1000 Oersteds. With the matrix in place the background field increases substantially.

The background field induces a field several times more intense in the collecting elements. A high field gradient is provided at the collecting edges; the dimensions and orientation of the elements are essential to these high gradients. Energy gradient (HdH/dX) at the collecting edges of a standard matrix element fabricated of steel ribbon 1/4" in width and 0.02" thick is calculated as 2.5 x 10¹¹ Gauss²/cm, assuming that the field induced in the steel near the edge is about 5000 Gauss, as measurements indicate.

Matrices: Standard grids are fabricated by winding in spiral form two ribbons of type 430 stainless steel, one crimped to provide uniform openings and one flat. Nickel brazing provides rigidity. The matrix supplied for a particular application is composed of grids selected for ribbon dimensions and size of openings suitable for the material to be processed.

Other matrix materials are available.