Measuring and testing – Gas content of a liquid or a solid – Particular separator
Patent
1993-11-02
1994-11-08
Noland, Thomas P.
Measuring and testing
Gas content of a liquid or a solid
Particular separator
204431, G01N 2726
Patent
active
053616243
ABSTRACT:
The present invention includes a microelectrode which achieves a surface-renewal advantage. The sensor and method directly controls the oxidizing and reducing nature of the electrode interface by controlling the cell potential, thereby protecting the sensing electrode's surface during periods in which the sensor is not being used. The microelectrode is biased at a small positive potential relative to the counterelectrode, except when a measurement is desired. To measure oxygen concentrations in brake fluid, the microelectrode is biased at a greater potential and the current is measured. After the current measurement, the potential is returned to the small positive potential. The oxygen concentration (and thus the amount of air) in the brake fluid is linearly related to the current measured.
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Koch Brian J.
Lambert David K.
Verbrugge Mark W.
Brooks Cary W.
General Motors Corporation
Noland Thomas P.
Roskos Joseph W.
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