Method of regenerating amperometric sensors

US20090159462A1Inactive Publication Date: 2009-06-25METTLER TOLEDO AG

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[0026]FIG. 1 shows an amperometric sensor 101 with exposed electrodes 102, 103 of the kind known for example as a state-of-the-art oxygen sensor. The sensor 101 has a sensor housing 104 at one end of which a working electrode 102 and a counter electrode 103 are arranged. Shown here is a two-electrode sensor, but three-electrode versions with an additional reference electrode also exist (see FIG. 3). In the operative state, the electrodes 102, 103 are covered by a membrane body 105 filled with an electrolyte and encased by a cover sleeve 106 which, as shown here, can be additionally covered by a protective cap 107. The electrodes 102, 103 are immersed in the electrolyte.

[0027]To perform the regenerating process according to the inventive method, the membrane body 105, the electrolyte, the cover sleeve 106 and the protective cap 107 are removed, and the exposed electrodes 102, 103 are brought into contact with an active regenerating solution (see FI...

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Abstract

A method for regenerating an amperometric sensor involves bringing the electrodes of the sensor into contact with an active, complex-forming regenerating solution and connecting the electrodes into an adjustable electric circuit. This forms an electrochemical cell. Then, at least one negative and/or positive voltage pulse is applied to the electrochemical cell to either oxidize or reduce deposits on at least one of the electrodes into a deposit product, which is dissolved into the regenerating solution. The electrodes are removed from the regenerating solution and from the electric circuit, rinsed with a rinsing solution, and dried. After this, the electrodes are brought into contact with the sensor electrolyte and their functionality is verified. A device for performing this method is also provided.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims a right of priority under 35 USC §119 from German patent application 10 2007 061806.0, filed 19 Dec. 2007, the content of which is incorporated by reference as if fully recited herein.TECHNICAL FIELD[0002]The invention relates to a method and a device for regenerating at least one electrode of an amperometric sensor.BACKGROUND OF THE ART[0003]Amperometric sensors are used in the laboratory and in the process field for the determination of a multitude of chemical substances such as the determination of dissolved gases and in particular the determination of oxygen or ozone. Amperometric sensors are known in the form of two-electrode systems or three-electrode systems which have a working electrode, a counter electrode and, optionally, a reference electrode. During operation, the electrodes are immersed in an electrolyte.[0004]During operation of a sensor and in particular during continuous operation in a process syst...

Claims

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Application Information

Patent Timeline

25 Jun 2009

Publication

US20090159462A1

IPC: C25F1/00; C25F7/00

CPC: G01N27/38

Inventors: ZIZEK, CLAUS