Electrochemical sensor instrumentation

Details Electrochemical sensor instrumentation Electrochemical sensor instrumentation

1981-12-11

1984-08-28

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

204401, G01R 3102

Patent

active

044686080

ABSTRACT:
An electrochemical sensor system includes a high impedance ion selective electrode and an electrode test circuit that has an isolation capacitor connected between the output signal lead from the ion selective electrode and a test voltage terminal, and a monitoring circuit connected to respond to the output signal from the electrode. The isolation capacitor is a high quality capacitor and provides a shunt impedance that is much higher than the maximum electrode impedance. A voltage transition at the test voltage terminal is coupled by the isolation capacitor to the output lead and the resulting decay rate of the voltage transition on the output lead is monitored to provide an indication of the quality of the electrode.

REFERENCES:
patent: 2117596 (1938-05-01), Bender
patent: 2563062 (1951-08-01), Perley
patent: 2913386 (1959-11-01), Clark
patent: 3111622 (1963-11-01), Zechter
patent: 3661748 (1972-05-01), Blackmer
patent: 3713020 (1973-01-01), Kohler
patent: 3718568 (1973-02-01), Neuwelt
patent: 3986108 (1976-10-01), Thomas
patent: 4189367 (1980-02-01), Connery
patent: 4223549 (1980-09-01), Kitzinger

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