Abstract: The invention relates to a membrane mounting device for mounting a membrane or foil in a stretched condition at one end of a rod-shaped or tubular member, such as a measuring electrode member. The mounting device comprises a membrane to be mounted as well as a resilient mounting ring for retaining the membrane in its mounted condition. The resilient mounting ring is preferably kept in a condition substantially free from tension. However, immediately before use of the mounting device the ring may be tensed or stretched, and one end of a rod-shaped or tubular member may then be inserted in the membrane mounting device whereby the membrane may automatically be mounted at the said end of the rod-shaped or tubular member.

Abstract: Electrochemical measuring electrodes often have a thin foil-shaped membrane, e.g. made of a plastic foil, which is arranged at one end of a cylindrical portion of the electrode and maintained in position by means of a resilient ring-shaped member, e.g. an O-ring, which presses the folded-over edge portion of the membrane against the outside of the cylindrical portion. It is now suggested to guide the ring-shaped holding member in such a way on the cylindrical portion that it protrudes beyond the membrane and thereof. The guiding may be provided by means of a circumferential groove in the cylindrical portion near the membrane end thereof.