Abstract: A single-rod pH measuring arrangement comprised of a pH-sensitive glass electrode and a reference electrode electrically communicating with the solution to be measured via a salt bridge. A plastic containing member partially surrounds the glass electrode in a manner providing an aperture through which the pH-sensitive part of the glass electrode projects. The edge of the plastic member lies adjacent to the surface of the glass electrode whereby the space between the two constitutes the salt bridge, with the latter being particularly insensitive to reference electrode problems such as solid protein layer deposition due to the blood coagulation system which leads to reference electrode potential instability.

Abstract: An electrode cell assembly for the continuous determination of ion concentrations in living tissues, which cell assembly comprises a measuring electrode having an ion selective member, which is shaped in a way so that it can be introduced into the living tissue and which cell assembly, furthermore, has a reference electrode in a housing which is filled with an electrolyte and which housing of the reference electrode has a membrane which is in continuous contact with the surface, e.g., the skin or the tissue of the living being during the determination of the ion concentrations, so that the ion concentration can be continuously read off from a recording device with which the electrode cell assembly is connected.