Self diagnostic ph sensor

G - Physics – 01 – R

Patent

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Details

G01R 27/02 (2006.01) G01N 27/416 (2006.01) G01R 31/28 (2006.01)

Patent

CA 2119435

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.

Appareil et procédé permettant de mesurer l'impédance potentiométrique d'une électrode à des fins diagnostiques tout en pouvant lire en continu les résultats de la valeur traitée. Une onde carrée est appliquée à un circuit externe (78, 84) qui, à son tour, est couplé à une sortie d'un ensemble à électrodes (13), par l'intermédiaire d'un condensateur (52). La sortie de l'électrode (13) est convertie en un signal modulé en largeur d'impulsions et échantillonnée. Ces valeurs échantillonnées sont utilisées pour calculer l'impédance et la valeur de sortie du traitement.

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