Electricity: measuring and testing – Electrolyte properties – Using a conductivity determining device
Patent
1985-04-18
1987-03-24
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Electrolyte properties
Using a conductivity determining device
324444, 324 99D, G01N 2702
Patent
active
046528300
ABSTRACT:
Circuit for measuring the relative change in conductivity between two cells which include a test biorigion and a control biorigion as the test cell biorigion conductivity changes as a result of analyte modecules binding to receptor sites in the test cell biorigion. The invention includes circuitry for driving a current through each of the cells and for measuring the voltage drops across the test and control cells as a function of time. A novel two-stage ac analog-to-digital convertion circuit in which the initial conductivities are measured via a successive approximation process, while the relative conductivities are monitored during a test interval via a tracking technique is included. The circuitry is controlled by a digital controller which can vary the parameters of the measurement processes so as to make the circuit adaptable to the measurement of a wide variety of substances using different cell configurations and/or electrolytes.
REFERENCES:
patent: 3946309 (1976-03-01), Roughton et al.
patent: 4262253 (1981-04-01), Clark
EG&G Ocean Products, Inc.
Eisenzopf Reinhard J.
Mueller Robert W.
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