Chemistry: electrical and wave energy – Processes and products
Patent
1987-06-05
1989-04-18
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
204412, 204416, 204418, 204419, 204435, G01N 2730
Patent
active
048224561
ABSTRACT:
A real time, on-line ion mesurement system for a solution has continuous monitoring of the physical conditions of the ion electrode and the reference electrode of the system. A dual chamber reference electrode is provided having an inner chamber and electrode for providing an ion measurement reference potential, and an outer chamber and electrode for producing a monitoring potential to detect poisoning of the reference electrode membrane. A first time varying low level signal is applied to the ion electrode and a second time varying low level signal orthogonal to and uncorrelated with the first signal is applied to a solution ground electrode disposed in the solution adjacent the reference electrode, the signals producing a composite common ground current. A pair of cross-correlators extracts the two time varying components from the common ground current for measuring the ion electrode and reference electrode impedances. Visual readouts and threshold circuits are provided to indicate when changes in impedances and the reference monitoring potential occur indicative of a system fault.
REFERENCES:
patent: 3862895 (1975-01-01), King et al.
patent: 4498039 (1985-02-01), Galwey et al.
patent: 4686011 (1987-08-01), Jackle
Gorgos Kathryn
Niebling John F.
Wiggins Macdonald J.
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