Liquid level measuring process and indicator
Method and apparatus for measuring volume and density of fluids in a drilling fluid system
ApplicationNo. 06/575964 filed on 02/01/1984
US Classes:209/1, MISCELLANEOUS209/166, With modifying agents209/170Pneumatic
ExaminersPrimary: Lutter, Frank W.
Assistant: Bond, William
Attorney, Agent or Firm
International ClassesB03D 1/14 (20060101)
B03B 9/00 (20060101)
B03B 13/00 (20060101)
AbstractA method of controlling the separation of coal from a mixture of coal and refuse in a froth flotation device by measuring the differential back pressure between two gas bubbler tubes immersed to different depths into the body of pulp in the device to produce a first control signal representative of the pulp density, and adjusting the rate of addition of a froth enhancement additive to the froth flotation device responsive to changes in said first signal; a second signal, produced by measuring back pressure of a single bubbler tube and representative of the pulp level in said device, can be corrected for changes in density by combining it with said first signal and then utilized to control liquid level in the cell by adjusting the rate of withdrawal of refuse therefrom.