Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture
Patent
1990-10-09
1992-06-30
Williams, Hezron E.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
324664, 324667, G08B 2100
Patent
active
051252651
ABSTRACT:
A contamination capacitance probe system is disclosed that capacitively mtors whether or not two or more fluids or materials that have to remain separated have been mixed or mingled and that provides first and second control signals respectively representative of the unmingled and mingled conditions. The system includes a capacitance sensor constituted by spaced-apart first and second capacitor plates of preselected size and spacing. The plate size and spacing is selected to render negligible any effect that the different materials or fluids or materials might have on the capacitance of the sensor. Circuit means are disclosed that includes a capacitance to frequency convertor, a frequency to voltage convertor, and a Schmidt trigger operative to provide the first and second control signals. The contamination capacitance probe system of the present invention is operable with any two or more fluids or materials having different dielectric constants and that are either immiscible or miscible.
REFERENCES:
patent: 1960168 (1934-05-01), Schoenberg
patent: 3816811 (1974-06-01), Cmelik
patent: 4114090 (1978-09-01), Poskitt
patent: 4638305 (1987-01-01), Sutton
patent: 4683904 (1987-08-01), Iltis
patent: 4710757 (1987-12-01), Haase
patent: 4751842 (1988-06-01), Ekrann et al.
patent: 4916940 (1990-04-01), Mougne
Frank Thomas A.
O'Connell Thomas A.
Lall Prithvi C.
McGowan Michael J.
Miller Craig
Oglo Michael F.
The United States of America as represented by the Secretary of
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