Electrochemical measuring electrode
First Claim
1. An arrangement for carrying out electrochemical measurements on samples, comprisinga measuring chamber having walls surrounding a measuring cavity, inlet and outlet means for introducing the samples into and expelling them from the measuring cavity, and a hole in the walls leading to the measuring cavity, in combination withan electrochemical measuring electrode including a substantially cylindrical portion, a thin foil-shaped membrane arranged over an end face of the cylindrical portion and folded along the adjacent cylindrical outer wall of the cylindrical portion, a resilient O-ring inserted over the folded-over part of the membrane and a circumferential groove in the cylindrical portion at the transition from the cylindrical outer wall to the end face thereof, the groove being of such dimension in relation to the O-ring and so positioned that the O-ring, when seated in the groove, will be maintained therein by its elastic force and extends beyond the end face of the cylindrical portion, whereby, when the electrode is placed so in relation to the measuring chamber that the membrane covers the hole in the walls of the measuring chamber, the O-ring will in addition to maintaining the membrane in position on the cylindrical portion, provide a sealing of the membrane against the walls of the measuring chamber.
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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.
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Citations
1 Claim
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1. An arrangement for carrying out electrochemical measurements on samples, comprising
a measuring chamber having walls surrounding a measuring cavity, inlet and outlet means for introducing the samples into and expelling them from the measuring cavity, and a hole in the walls leading to the measuring cavity, in combination with an electrochemical measuring electrode including a substantially cylindrical portion, a thin foil-shaped membrane arranged over an end face of the cylindrical portion and folded along the adjacent cylindrical outer wall of the cylindrical portion, a resilient O-ring inserted over the folded-over part of the membrane and a circumferential groove in the cylindrical portion at the transition from the cylindrical outer wall to the end face thereof, the groove being of such dimension in relation to the O-ring and so positioned that the O-ring, when seated in the groove, will be maintained therein by its elastic force and extends beyond the end face of the cylindrical portion, whereby, when the electrode is placed so in relation to the measuring chamber that the membrane covers the hole in the walls of the measuring chamber, the O-ring will in addition to maintaining the membrane in position on the cylindrical portion, provide a sealing of the membrane against the walls of the measuring chamber.
Specification
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- Resources
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Current AssigneeRadiometer A/S (Danaher Corporation)
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Original AssigneeRadiometer A/S (Danaher Corporation)
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InventorsAas, Flemming, Jensen, Ole Dollerup
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Primary Examiner(s)Kaplan, G. L.
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Application NumberUS05/508,623Time in Patent Office932 DaysField of Search204/195 P, 204/1 TUS Class Current204/409CPC Class CodesG01N 27/30 Electrodes, e.g. test elect...
