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Two techniques for on-line particle size measurement areWe compare this with a scanning back scatter instrument which evaluated on the reproducibility of their volume distribution is directly inserted in highly concentrated slurries. We present determinations. A forward scattering laser light devise is inter-the methods used to improve the robustness of the conversion faced with a dilutor to examine the potential of this technique of the output of the back scatter instrument to volume distribufor high concentration streams. The forward scattering in-tions. The output of the back scatter instrument is inherently struments are capable of outputting extremely reproducible less stable but with the proper methods one can obtain reprodistributions and here we show that when the dilutor is well ducibilities of the order of 2 to 6 percent. designed, the on-line instrument can have similar performance.

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