Importance

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Abstract

A particle suspension from a process is introduced into a measuring vessel 1 and caused to rise above a screen 4 whereupon the streaming potential of the suspension is determined by measuring the voltage across the screen at alternately different, relatively low pressures. The measurements may be carried out continuously with the measuring vessel being rinsed between measurements. The apparatus comprises a vertical U-shaped measuring vessel 1 in which a horizontal screen plate 4 in one leg 3 defines a measuring chamber 9, the other leg 2 being supplied with the suspension. Valves V4-V8, V10 are provided to alternately subject the vessel to different measurement pressures, and to provide a high rinsing pressure. Adjacent its center the screen plate supports electrodes 5, 6 for measuring the voltages between particle suspension and filtrate, and an electrode 11 is associated with the screen plate for measuring the conductivity of the suspension. The drainage rate of the suspension may be determined by a pair of sensors 14, 15 at different levels above the screen plate and a time meter.

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First Claim