THE ACCURACY OF A SPECTRAFLOW ANALYZER
SpectraFlow is the only online analyzer on the market free of any radioactive components, neutron generators or lasers. Therefore SpectraFlow is completely safe to operate and no licenses or permits are needed to import, operate and maintain the online analyzer system. This report evaluates at nine different locations the accuracy of the SpectraFlow Analyzer with dynamic comparisons of the XRF at the airslide of raw mills, as well as an absolute comparison of the XRF of crossbelt analyzers after crushers of cement plants. Additionally a dynamic comparison of the results of a Prompt Neutron Activation Analyzer (PGNAA) after a limestone crusher of a cement plant was done. The results of this report show, that SpectraFlow is measuring compared to the XRF reference all constituents very accurately and compared to the PGNAA more accurate. For the process control at the Raw Mill it is essential, that the analyzer delivers very accurate measurement values, as the constituent ranges are very small (e.g. CaO 41% - 45%) compared to an application after the raw material crusher (e.g. CaO 30% - 55%). To control the weight feeders of the additives the measurement results have to be very accurate, real-time (no running averages) and noise-free. A measurement on a belt conveyor is always less accurate than a measurement of raw material on an airslide, due to the consistent grain size and homogeneity of the raw material. Therefore PGNAAs installed before the raw mill are not very efficient to reach very low standard deviations of the Raw Meal, because they have to be installed always on the belt conveyor before the raw mill rather than on the airslide after the mill. SpectraFlow is therefore the most efficient online analyzer for raw mill control.
This report shows the result of the SpectraFlow Analyzer compared to the conventional offline method XRF, as well as to Prompt Neutron Activation Analyzer (PGNAA). PGNAAs are highly toxic and dangerous and with the availability of SpectraFlow no longer necessary to operate. All the data in this report is collected over representative time frames and from nine different customer installations.
As the results show SpectraFlow is a highly accurate measurement device. The reason for this is:
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