Membrane mounting device

A mounting device for mounting a membrane or a foil in a stretched condition at one end of a rod-shaped or tubular member, such as a measuring electrode member, said mounting device comprising

• a body member defining a passage therein and having first and second abutment surfaces at opposite first and second ends of said passage, respectively,
• a membrane or foil arranged at said first end of the passage and extending transversely in relation thereto, said membrane being releasably retained at its rim portion,
• a ring-stretching means including a radially enlarged part which is positioned at said second end of the passage and which may engage with said second abutment surface, and a part extending axially from said enlarged part through said passage, said ring-stretching means being axially displaceable in relation to said body member, and
• a separate resilient mounting ring surrounding the axially extending part of said stretching means and positioned at said first end of the passage, the outer diameter of said ring exceeding the minimum diameter of the adjacent first end of said passage, whereby said ring may engage with said first abutment surface.