Method for making a polarographic oxygen sensor
First Claim
1. A method for making a polarographic oxygen sensor, comprising the steps of:
- a) providing an elongate cathode housing formed of an inert, electrically non-conducing machinable ceramic material and having a longitudinal passage therein extending into an opening of lesser diameter than the passage at a tip end of the housing;
b) securing an elongate cathode comprising at least one cathode wire through said longitudinal passage, symmetrically spaced from walls of said passage;
c) providing molten glass in said passage in which the cathode is secured;
d) allowing the molten glass to flow into said opening, toward said secured cathode, and toward said walls; and
e) subsequently allowing said molten glass to solidify and form a glass seal in said passage between the cathode and the cathode housing along a substantial length of the cathode.
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Accused Products
Abstract
The cathode sub-assembly of a polarographic sensor comprises an elongate housing with a longitudinal opening therethrough and with noble metal wires extending completely through the opening, the wires held symmetrically in the longitudinal opening by an extensive plug of glass which is solidified in situ in sealing contact with the wires and with the wall of the longitudinal opening. A suitable tubular anode is provided through which the cathode sub-assembly protrudes, and a flexible membrane of an inert material, which is permeable to gas and impermeable to water vapor and other than gaseous dissolved solutes, is secured in sealed relationship over the anode and the cathode, with a film of electrolyte bathing the anode and the cathode and contained by the membrane.
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Citations
5 Claims
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1. A method for making a polarographic oxygen sensor, comprising the steps of:
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a) providing an elongate cathode housing formed of an inert, electrically non-conducing machinable ceramic material and having a longitudinal passage therein extending into an opening of lesser diameter than the passage at a tip end of the housing; b) securing an elongate cathode comprising at least one cathode wire through said longitudinal passage, symmetrically spaced from walls of said passage; c) providing molten glass in said passage in which the cathode is secured; d) allowing the molten glass to flow into said opening, toward said secured cathode, and toward said walls; and e) subsequently allowing said molten glass to solidify and form a glass seal in said passage between the cathode and the cathode housing along a substantial length of the cathode. - View Dependent Claims (2, 3, 4, 5)
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Specification