Dispersion of Samples and Sample‐feeding for Counting Methods

Abstract

The currently used methods of sample preparation are examined and found to be unsatisfactory in case of counting methods for particle size analysis. It is the purpose of this paper to review the results of investigations of two different measuring principles (light extinction and electrical resistance change) by use of the same signal handling equipment. The commonly used techniques and units are compared with regard to the resulting density distributions of particle size below 0.25 mm. The final conclusions including recommendations to the use of ultrasonic treatment and to improvements of the sampling and the sample‐feeding units are valid for all counting methods.

Optische Extinktionsmessverfahren zur Inline‐Kontrolle disperser Stoffsysteme

“…Ersetzt man in Gl. (8) die Partikelanzahlkonzentration c N durch die einfach bestimmbare Partikelvolumenkonzentration c V , erhält das Lambert-Beersche Gesetz die für monodisperse Partikel gebräuchliche Form:…”