A conductivity probe for measuring local concentrations in slurry systems

Abstract

A simple, economical and accurate technique has been developed to measure local in situ solids concentration in slurry systems. The instrument relies on measuring slurry resistivity, as it changes with the solids concentration, for a small region in space. The device was tested in comparison with isokinetic sampling and γ-ray absorption for a variety of slurry pipeline flows. The effects of fluid properties, temperature, velocity, particle size and pipe wall material were examined experimentally. In contrast with previous techniques the effect of fluid velocity upon the measurements was eliminated by a dual electrode-pair system. © 1987.