Patent ID: 9217724
Filing Date: 2015-12-22
Classification: G01N

Abstract:
1. A potentiometric sensor comprising: a housing, in which a reference half cell space and a separated, measuring half cell space are formed, wherein said reference half cell space contains a reference electrolyte and at least one part of a first potential sensing electrode immersed in the reference electrolyte for sensing a reference potential, and said measuring half cell space is liquid-tightly sealed by a measuring membrane, and contains an inner electrolyte and at least one part of a second potential sensing electrode immersed in the inner electrolyte for sensing a measuring half cell potential; a passageway which extends through a wall of said housing, opens into said reference half cell space, and is sealed relative to a medium surrounding said housing; and means for producing through said passageway an electrolytic contact between said reference electrolyte and medium surrounding said housing, wherein: said passageway is sealed by a wall, film or membrane or a plug or stopper of a polymer materials, which is insoluble in the reference electrolyte, and, in contact with a process medium which progressively dissolves the seal.