Method and device for eliminating electrode drift

Details Method and device for eliminating electrode drift Method and device for eliminating electrode drift

1996-04-17

1998-06-16

Lacyk, John P.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

128637, 128640, 204406, 204420, 204433, 204435, G01N 2726

Patent

active

057664323

ABSTRACT:
A pH-measuring method and device for monitoring and then correcting for electrode drift is provided. The device includes a pH-measuring electrode and more than one reference electrode. During operation, the pH-measuring device is place in contact with a sample. The pH value measured at each electrode pair is due to the electrical potential difference between the pH electrode and the reference electrode. The maximum and minimum pH values are determined, and then the remaining pH values are averaged together to generate an overall average pH. The maximum and minimum pH values are subtracted from the average pH to generate a difference which is then compared to a user-defined drift level to determine if a particular electrode is deficient. The pH values from deficient electrodes are not considered when the overall pH of the sample is determined.

REFERENCES:
patent: 4133732 (1979-01-01), Boeke
patent: 4155814 (1979-05-01), Tejfalussy et al.
patent: 4404065 (1983-09-01), Matson
patent: 4647362 (1987-03-01), Watanabe
patent: 4686011 (1987-08-01), Jackle
patent: 4748562 (1988-05-01), Miller et al.
patent: 4780663 (1988-10-01), Mulder
patent: 4886584 (1989-12-01), Cheng
patent: 4912417 (1990-03-01), Giggoney et al.

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