Electrolysis: processes – compositions used therein – and methods – Electrolytic analysis or testing – For nitrogen or nitrogen containing compound
Patent
1997-06-25
2000-03-14
Tung, T.
Electrolysis: processes, compositions used therein, and methods
Electrolytic analysis or testing
For nitrogen or nitrogen containing compound
204425, 204426, 2057845, 2057865, 205788, G01N 27407
Patent
active
06036842&
ABSTRACT:
A system is constructed such that a voltage between an inner pumping electrode and a reference electrode is measured to determine a difference between a measured voltage and a reference voltage so that a pumping voltage is controlled by using the differential voltage. Specifically, a comparative amplifier is provided for comparing the reference voltage with the terminal voltage between the reference electrode and the inner pumping electrode, and amplifying the difference therebetween with a predetermined gain to make an output. The system is wired and connected such that the output voltage (differential voltage) from the comparative amplifier is applied, as the pumping voltage supplied to an oxygen pump, between the inner pumping electrode and an outer pumping electrode. The inner pumping electrode is grounded. Accordingly, for example, when the oxygen pump is used, it is possible to effectively avoid the oscillation phenomenon in the feedback control system for the control voltage for the oxygen pump.
REFERENCES:
patent: 4857164 (1989-08-01), Kodachi et al.
patent: 4927517 (1990-05-01), Mizutani et al.
patent: 5672811 (1997-09-01), Kato et al.
Japanese Utility Model Publication No. 7-45004; published Oct. 11, 1995; "Oxygen Sensor" (Toyota Motor Corporation).
Ina Noriyuki
Kato Nobuhide
NGK Insulators Ltd.
Tung T.
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