Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Material level or thickness responsive
Patent
1980-10-31
1982-09-07
Adee, John
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Material level or thickness responsive
210 90, B01D 2100
Patent
active
043482783
ABSTRACT:
A settlement tank wherein suspended solids or denser fluids are separated from a lighter parent liquid by gravitational settlement is provided with a monitoring arrangement to permit determination of the prevailing distribution of suspended matter, including that depth of the lighter liquid at which an interface may exist with settled material of greater density, to permit selective removal of one of the fluids from the tank, for utilization or disposal. The monitoring arrangement comprises a probe displaceably mounted for movement downward through the liquid having detection means for sensing the instantaneous hydrostatic pressure acting on the head of the probe. One embodiment utilizes a display wherein the variation in density is evidenced as a change in the gradient of a pressure depth and/or pressure time characteristic. The provision of depth monitoring means for the probe head permits the provision of a subtractive feed back to compensate for the static head of the parent fluid, which by subtraction from the sensor head output provides a differential output responsive solely to variation in sensed pressure due to the presence of settling suspended matter creating a density change of the tank contents at the level being sensed.
REFERENCES:
patent: 3443692 (1969-03-01), Halsey
patent: 3939072 (1976-02-01), La Forte
patent: 3983031 (1976-09-01), Kirk
patent: 4226714 (1980-10-01), Furness et al.
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