G - Physics – 01 – F
Patent
G - Physics
01
F
341/34
G01F 23/22 (2006.01) G01F 23/24 (2006.01)
Patent
CA 1221438
ABSTRACT OF THE DISCLOSURE: A method of monitoring changes in surface level of a nonmetallic flowable material in a container wherein a boundary layer without abrupt impedance change is provided between the material and an overlying gaseous medium. The method comprises the steps of: periodically positively ad- vancing a probe through the boundary layer toward the material which is selected from the group consisting of bulk solids, aqueous solutions, aqueous dispersions and organic liquids and retracting the probe away from the material so that at least during each advance and retraction cycle the probe is withdrawn from any contact with the material and out of the boundary layer and into the gaseous medium; during the periodic advance and retraction of the probe measuring the electrical impedance between the material and the probe to provide a control signal representing the location of the boundary level; and controlling the level of the material in the container in response to a comparison of the control signal with a signal obtained from a previous advance and retraction of the probe. And an apparatus to carry out this method.
456915
Christ Rolf
Naaf Rudiger
Schliefer Heinrich
Norddeutsche Affinerie Ag
Robic Robic & Associes/associates
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