Most experience exists for coal with a particle size 0 - 20 mm . The precision achieved depends on the concrete characteristics of the coal (i.e. inhomogenties of filter cake and/or mud), but is about +/- 0,5 %. For more homogeneous materials the precision can be largely enhanced up to an accuracy of ±0,1% which has been achieved for instance in sand.
±0.3% was the result in copper ore.
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