Vision device for viewing a granular material stream

The invention relates to a visual device 10 for viewing of a granular stream of material, comprising a first inlet 14 for admitting a first flow of material into the classifying device 10, a second inlet 12 for admitting a second stream of material into the classifying device 10, a static classifier 20, a dynamic classifier 22 wherein the static separator 20 is arranged such that it 22 at least partially encloses the dynamic classifier, the classifying device 10, a manifold 42; 52; having 54 which is adapted to supply the material flow of the first inlet 14 of the static separator 20 and the material flow of the second inlet 12 to the dynamic classifier 22nd