Kozin V. Z., Komlev A. S. – The Ural State Mining University, Ekaterinburg, the Russian Federation.
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All the analyzers of weight mass in flux single out and analyze a part of the material of a flux, which is equivalent to
the sample selected with the method of longtitudal sections. Such sampling is equivalent to sampling from a well-stirred
massif where inaccuracy depends on the mass of a sample. The analyzed mass depends on the conditions of the
analysis and can be hundreds of grams for pulps, whereas for lumpy products – kilograms. Pit sample is represented
by the mass of the material analyzed in the fixed period of the analysis, when the quantity of pit samples is the function
of break duration between the measurements (analyses). Random inaccuracy of pulp analyzers, depending on the
mass of the analyzed material, can be associated with inaccuracies acquired in sampling with the method of longtitudal
sections. When analyzing a large amount of pit samples, random inaccuracy can be significantly decreased. Random
inaccuracy of analyzers of ore fluxes at the conveyors, depending on the mass of the analyzed material, is high and
becomes acceptable only under averaging of a large amount of pit samples. Under the use of the method of longtitudal
sections, systematic inaccuracy can be totally excluded.

Key words: analyzers of ore fluxes; the method of longtitudal sections; sampling inaccuracy.

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