Importance

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Abstract

A device for mounting and securing a membrane made of a substantially flat piece of flexible polymer film on an amperometric cell that has a substantially cylindrical cell end frontally provided with an electrolyte-bearing sensor face by means of a removable annular holding member; according to the invention the holding member is a substantially non-resilient and creep-resistant die ring, preferably made of stainless steel, having a cylindrical inner surface that fits slidingly onto the cylindrical cell end and at least one tapered inner surface portion that extends outwardly from the cylindrical inner surface toward a leading end of the die ring; the leading end of the die ring is moved over the cylindrical cell end whereby the polymer film is deep-drawn between the die ring and the cylindrical cell end and is permanently shaped to form a cup-shaped membrane portion extending over the electrolyte-bearing sensor face and the adjacent portion of the cylindrical cell end; the resulting cup-shaped membrane portion is sealingly held by the die ring on the cylindrical cell end during operation of the amperometric cell. A membrane-enclosed amperometric cell having a cylindrical cell end frontally provided with an electrolyte-bearing sensor face, a semi-permeable membrane formed of a flexible polymer film and extending over the sensor face; a circumferential portion of the membrane is in contact with the cylindrical cell end; a removable annular holding member is arranged around the circumferential portion of the membrane and presses the circumferential portion of the membrane sealingly onto the cell end; according to the invention, the annular holding member is a non-resilient and creep-resistant die ring, preferably made of stainless steel, having a cylindrical inner surface slidingly fitting onto the cylindrical cell end and at least one tapered inner surface portion outwardly extending from the cylindrical inner surface toward a leading end portion of the die ring; the membrane has a permanently formed cup-shaped portion extending over the electrolyte-bearing sensor face and an adjacent portion of the cylindrical cell end; the cup-shaped membrane portion is sealingly held by the die ring on the cylindrical cell end during operation of the cell; the die ring can be removed; e.g. for cell maintenance and re-used for applying and shaping a fresh membrane.

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First Claim