System for monitoring and reporting the operability and calibrat

Details System for monitoring and reporting the operability and calibrat System for monitoring and reporting the operability and calibrat

1988-07-05

1990-02-13

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204 1T, 204412, 204415, G01N 2746

Patent

active

049004220

ABSTRACT:
A system for real time, on-line dissolved oxygen (DO) measurement of a process solution provides continuous data of the physical condition of the DO sensor and of the entire system performance. A DO sensor is disposed in the solution with two external electrodes adjacent thereto. A time-varying low level signal is applied to one electrode producing a current through the sensor membrane and grounded electrode, which is detected by a cross-correlation circuit to monitor the membrane impedance. The other electrode is periodically driven by a short, low level dc pulse, producing electrolysis of the water between the two electrodes, and generating a small, repeatable amount of oxygen ions. The sensor response is analyzed providing a direct indication of the sensor and system performance.

REFERENCES:
patent: 3661748 (1972-05-01), Blackmer
patent: 3718568 (1973-02-01), Neuwelt
patent: 4168220 (1979-09-01), McAdam et al.
patent: 4189367 (1980-02-01), Connery et al.
patent: 4541901 (1985-09-01), Parker et al.

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