System, apparatus, and method for measuring an ion...

Details System, apparatus, and method for measuring an ion... System, apparatus, and method for measuring an ion...

2007-06-25

2011-10-04

Barton, Jeffrey T (Department: 1759)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C073S023310, C073S031050, C204S425000

Reexamination Certificate

active

08029656

ABSTRACT:
An apparatus, system and method maximizes efficiency and accuracy of measuring an ion concentration of a measured fluid by varying a flow of ions within a measuring cell in accordance with an output signal of a sensor cell. The pump current through a pump cell is switched between a constant positive current and a constant negative current when upper and lower thresholds of the output signal are reached. The pulse width ratio of the square wave produced by the varying current is compared to a pulse width ratio function derived from a calibration procedure to determine the ion concentration of the measured fluid. In one embodiment, the functions of the pump cell and sensing cell are performed by a single electrochemical cell.

REFERENCES:
patent: 4226692 (1980-10-01), Isenberg
patent: 4384935 (1983-05-01), De Jong
patent: 6442998 (2002-09-01), Kurokawa et al.
patent: 2002/0046947 (2002-04-01), Lawless

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