Dissolved oxygen sensor calibration, monitoring and reporting sy

Details Dissolved oxygen sensor calibration, monitoring and reporting sy Dissolved oxygen sensor calibration, monitoring and reporting sy

1988-10-11

1992-03-24

Fisher, Richard V.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204415, 204412, 20415317, G01N 27419

Patent

active

050985477

ABSTRACT:
A dissolved oxygen measurement system includes real time monitoring and calibrating of a dissolved oxygen sensor. The sensor includes a pair of measuring electrodes, an electrolyte, and a pair of closely spaced electrolysis electrodes. The housing includes a permeable membrane and is immersed in the process solution. A computer is provided, programmed to perform dissolved oxygen concentration measurement, and continuous monitoring of the membrane impedance and sensor condition. A test electrode is disposed in the process solution adjacent the membrane and is driven by a low level pseudorandom binary signal from the computer producing a current through the membrane impedance which is monitored by the computer. Small pulses of direct current are passed between the electrolysis electrodes, producing small increases in oxygen. The pulse characteristics of the resulting small increases in oxygen concentration are continuously monitored by the computer for any changes in condition of the dissolved oxygen sensor and for on-line recalibration of the sensor and system.

REFERENCES:
patent: 2805191 (1957-09-01), Hersch
patent: 4223549 (1980-09-01), Mitzinger
patent: 4457808 (1984-07-01), Taylor et al.
patent: 4460448 (1984-07-01), Wolcott
patent: 4900422 (1990-02-01), Bryan et al.

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