SEDL / STP / STP234-EB / STP39300S

Electronic Size Analysis of Subsieve Particles by Flowing through a Small Liquid Resistor

Berg, RH
Process Control Services Co., Elmhurst, Ill.

Pages: 14    Published: Jan 1959

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Abstract

This paper describes basically a new principle of particle content and size analysis and reviews the principal theoretical points. The method is applicable to sizes ranging from below 0.6 μ. to over 200 μ. A suspension of particles in conductive liquid flows through an aperture with simultaneous flow ofelectrical current, resulting in a series of electrical pulses, each pulse being proportional in magnitude to the volume of the particle causing it. The pulses are amplified, scaled, and counted to provide direct data for plotting cumulative particle frequency against particle size. Potentials and limitations are discussed, and methods of calibration, sample preparation, and data reduction are emphasized.