Patent ID: 8043490
Filing Date: 2011-10-25
Classification: G01N

Abstract:
1. A combination electrode, comprising: a first tube, which is, at least radially, electrically non-conductive; a measuring membrane, which is arranged at a first end section of said first tube and which sealedly closes said first tube to form a measuring chamber; a second tube, which, at least sectionally, surrounds said first tube and which is connected with said first tube, so that, between said first tube and said second tube, an annular reference chamber is formed; a buffer solution located in said measuring chamber; an electrolyte solution located in said reference chamber; a first electrode in contact with said buffer solution, in order to tap a first potential; and a second electrode in contact with the electrolyte, in order to tap a second potential, wherein: arranged in said reference chamber is an annular sealing element, which is axially shiftable in said annular reference chamber and which axially bounds a volume occupied by the electrolyte solution; and said annular sealing element is axially biased by means of an electrically conductive, elastic, deformation element, which surrounds said first tube, and said second electrode is electrically conductively connected with said deformation element, so that the potential of said second electrode can be tapped via said deformation element.