Self diagnostic pH sensor

Details Self diagnostic pH sensor Self diagnostic pH sensor

1991-10-25

1993-12-07

Teska, Kevin J.

Boots, shoes, and leggings

324438, 364486, 364496, 364550, G06F 1546, G01R 2700

Patent

active

052688526

ABSTRACT:
An apparatus and method for measuring potentiometric electrode impedance for diagnostic purpose while continuously reading the results of the process value. A square wave is applied to an external circuit, which in turn is coupled to an electrode assembly output through a capacitor. The output of the electrode is converted into a pulse width modulated signal and sampled. These sampled values are used to calculate the impedance and process output value.

REFERENCES:
patent: 4013899 (1977-03-01), Guicheteall
patent: 4536274 (1985-08-01), Papadakis et al.
patent: 4546441 (1985-10-01), Burch
patent: 4777444 (1988-10-01), Beijk et al.
patent: 4829253, Koluver
patent: 4998068 (1991-03-01), McKee, Jr.
patent: 5046028 (1991-09-01), Bryan et al.

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