Electricity: measuring and testing – Electrolyte properties – Using a conductivity determining device
Patent
1990-09-10
1992-02-11
Harvey, Jack B.
Electricity: measuring and testing
Electrolyte properties
Using a conductivity determining device
324446, 324450, G01N 2702
Patent
active
050878832
ABSTRACT:
A device for detecting relative differences in conductivity between filtered and unfiltered states of fluid comprises a differential comparator for measuring the voltage difference of its input ports, a differential bridge connected to the input sorts of the differential comparator for measuring the conductivity of the fluid, the differential bridge having electrodes for contacting the fluid in each of its filtered and unfiltered states and bridge adjustment circuitry for compensating for voltage offsets of the comparator and the bridge, and an indicator connected to the output of the comparator for generating an output indicative of the differential conductivity of the fluid in its filtered and unfiltered states.
REFERENCES:
patent: 3781659 (1973-12-01), Ur
patent: 3938034 (1976-02-01), Japenga
patent: 4331923 (1982-05-01), Akers, Jr.
patent: 4455530 (1984-06-01), Lee et al.
patent: 4814281 (1989-03-01), Byers
Harvey Jack B.
Hochberg D. Peter
Kusner Mark
Mr. Coffee Inc.
Weisz Louis J.
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