Electrolysis: processes – compositions used therein – and methods – Electrolytic analysis or testing – For oxygen or oxygen containing compound
Reexamination Certificate
2008-03-04
2008-03-04
Olsen, Kaj K. (Department: 1753)
Electrolysis: processes, compositions used therein, and methods
Electrolytic analysis or testing
For oxygen or oxygen containing compound
C204S401000, C204S425000
Reexamination Certificate
active
10774491
ABSTRACT:
A set of methods controls the pumping action of and provides leak checking of a solid electrolyte oxygen sensor having internal and external electrodes. A first method performs a leak check on the sensor by forcing the sensor internal reference chamber to an evacuated state while seeking a minimum pumping current able to maintain this state. Further pumping control methods apply current pulses to the sensor electrodes to achieve a balanced state between an external oxygen partial pressure and an internal reference oxygen partial pressure. Reduction expressions modify the pulse parameters as a function of the sensor voltage output. A further expression modifies the pulse magnitude as a function of the internal reference chamber oxygen partial pressure. A further expression modifies the initial value of the pulse magnitude as a function of the oxygen partial pressure in a calibration gas during a calibration process.
REFERENCES:
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patent: 0 810 433 (1997-12-01), None
patent: 52-71293 (1977-06-01), None
Patent abstract for JP 55-66751, May 1980.
International Search Report mailed Apr. 1, 2005.
David M. Haaland, “Internal-Reference Solid-Electrolyte Oxygen Sensor”, Analytic Chemistry, vol. 49 No. 12, Oct. 1977, pp. 1813-1817.
William C. Maskell, “Progress In The Development of Zirconia Gas Sensors”, Solid State Ionics 134 (2000), pp. 43-50.
H. Kaneko et al., “Miniature Oxygen Pump-Gauge, I. Leakage Considerations”, Received Apr. 11, 1986, pp. 161-172.
General Electric Company
Nixon & Vanderhye P.C.
Olsen Kaj K.
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