Apparatus for the electrochemical determination of the partial oxygen pressure in a liquid measuring medium

US5225063A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Walter Gumbrecht · Herzogenaurach, DE
• Wolfgang Schelter · Uttenreuth, DE
• Roland Hofmann-Tikkanen · Pielavesi, FI
• Walter Preidel · Erlangen, DE

Key dates

• Filing date: Jul 10, 1991
• Grant date: Jul 6, 1993
• Expiry date: Jul 10, 2011

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N33/4925
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An apparatus for electrochemically determining the partial oxygen pressure pO.sub.2 in a liquid measuring medium includes a measuring sensor having a working electrode and a counter-electrode. The electrodes are manufactured in thin-film technology and are arranged on a substrate in a measuring channel, to which the measuring medium and a rinse medium can be supplied in alternation. The measuring channel connects a device which controls the flow rate of the measuring medium to a lumen of a double lumen catheter. The rinse medium is suppliable to a second lumen of the double lumen catheter with reversible flow direction. Both lumens have a common orifice which can be introduced into the measuring medium. So-called poisoning of the electrodes in this arrangement is suppressed because the electrodes are flooded in alternation by the measuring medium in a measuring phase and by the rinse medium in a regeneration phase.