Patent US4592825A successfully refreshed from Google Patents.
US4592825A
Expired / Lapsed
US
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Probe for measuring oxygen partial pressure in a gas atmosphere
Assignee: Individual
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Filing: 1985-08-23
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Granted: 1986-06-03
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Expires: 2005-08-23
Abstract
Abstract The probe comprises an outer casing communicating through apertures with the atmosphere of a furnace and bearing a support part on which the measuring electrode, or anode, is wound. A tablet of solid electrolyte in contact with the anode can be easily and quickly replaced when the measuring face thereof has become contaminated by the furnace atmosphere. The reference electrode, or cathode, is formed by the soldered junction and one of the wires of a thermocouple, the two conductors of which are crumpled into a hollow in the reference face of the tablet, then pass through a conduit of insulating refractory material. Between the bottom of the casing and that of a tubular support accommodated therein there is a spring which has the effect of pressing the tablet against a washer via the supporting part, thus sealing the furnace atmosphere from a reference atmosphere. The reference atmosphere is maintained by a flow of air or oxygen injected into the conduit and sweeping the wires of the thermocouple, exiting again within the tubular support.
Inventors
- 👤 Teresa Crevoiserat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:01
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4071; G01N27/4078
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
230 words
A probe for measuring the oxygen partial pressure in a gaseous atmosphere as compared with a reference atmosphere, comprising: a tablet of solid electrolyte having a first face exposed to the gaseous atmosphere and a second face exposed to the reference atmosphere; a tubular support releasably bearing against said tablet and separating said gaseous atmosphere from said reference atmosphere; a measuring electrode in contact with a central zone of said first face of said tablet; a reference electrode in contact with a central zone of said second face of said tablet; an annular seat surface at one end of said tubular support for sealably engaging a peripheral zone of said second face; a holding support for holding said measuring electrode in contact with said central zone of said first face; and means co-acting between said holding support and said tubular support for urging said measuring electrode against only said central zone of said first face and said peripheral zone of said second face against said annular seat, thereby simultaneously providing a releasably sealed connection between said tablet and said tubular support and an electrical contact between said central zone of said first face and said measuring electrode within said gaseous atmosphere the contact between said measuring electrode and said central zone being the sole area where pressure is transmitted between the holding support and the first surface of the tablet.
Claim 2
Dependent Claim
230 words
A probe for measuring the oxygen partial pressure in a gaseous atmosphere as compared with a reference atmosphere, comprising: a tablet of solid electrolyte having a first face exposed to the gaseous atmosphere and a second face exposed to the reference atmosphere; a tubular support releasably bearing against said tablet and separating said gaseous atmosphere from said reference atmosphere; a measuring electrode in contact with a central zone of said first face of said tablet; a reference electrode in contact with a central zone of said second face of said tablet; an annular seat surface at one end of said tubular support for sealably engaging a peripheral zone of said second face; a holding support for holding said measuring electrode in contact with said central zone of said first face; and means co-acting between said holding support and said tubular support for urging said measuring electrode against only said central zone of said first face and said peripheral zone of said second face against said annular seat, thereby simultaneously providing a releasably sealed connection between said tablet and said tubular support and an electrical contact between said central zone of said first face and said measuring electrode within said gaseous atmosphere the contact between said measuring electrode and said central zone being the sole area where pressure is transmitted between the holding support and the first surface of the tablet.
Claim 3
Dependent Claim
41 words
The probe of claim 1, wherein said holding support comprises a tubular casing enclosing said tubular support and a cap removably affixed to an end of said casing nearest to said measuring head, said measuring electrode being secured to said cap.
Claim 4
Dependent Claim
41 words
The probe of claim 2, further comprising gasket means disposed between said casing and said tubular support, said cap including apertures affording communication between said gaseous atmosphere and the interior of said casing. electrode to press said tablet against said seal.
Claim 5
Dependent Claim
16 words
The probe of claim 2, further comprising means electrically connecting said casing to said measuring electrode.
Claim 6
Dependent Claim
15 words
The probe of claim 4, wherein said casing is lined with a layer of platinum.
Claim 7
Dependent Claim
34 words
The probe of claim 1, wherein said seat surface of said tubular support is a plane, annular shoulder, and wherein a washer comprising a platinum ring is disposed between said table and said shoulder.
Claim 8
Dependent Claim
22 words
The probe of claim 1, wherein said measuring electrode comprises a supporting portion and a platinum wire wound about said supporting portion.
Claim 9
Dependent Claim
45 words
The probe of claim 1, further comprising two wires joined at a soldered junction to form a thermocouple constituting said reference electrode, said two wires constituting means for transmitting through said probe a potential from said reference electrode and a potential difference from said thermocouple.
Claim 10
Dependent Claim
76 words
The probe of claim 8, wherein said first face of said tablet is plane and said second face of said tablet is parallel to said first face and includes a hollow, said soldered junction and adjoining portions of said two wires being crumpled into a ball and accommodated in said hollow, said probe further comprises means for maintaining said ball of wire in contact with said second face of said tablet at a plurality of points.
Claim 11
Dependent Claim
77 words
The probe of claim 8, further comprising a tubular conduit of insulating material fitted within said tubular support and including at the end of said conduit remote from said measuring head a connection pipe, said two wires of said thermocouple constituting said reference electrode being guided within said conduit, and said connection pipe being. adapted to admit into said conduit a flow of said reference atmosphere for sweeping said second face of said tablet of solid electrolyte.
Claim 12
Dependent Claim
60 words
A probe according to claim 1, further comprising spring means disposed between said tubular casing and said tubular support, said tubular casing and support being axially movable with respect to each other, such that said measuring electrode is urged against said first face and said peripheral zone of said second face is urged against said seat by said spring means.
Claim 13
Dependent Claim
37 words
A probe according to claim 1, wherein each of said measuring and reference electrodes comprises a plurality of point contacts which contact a plurality of points of the central zones of the corresponding faces of said tablet.
Claim 14
Dependent Claim
57 words
A probe according to claim 12, wherein said measuring electrode further comprises a rigid body having a front portion disposed toward said first face, said front portion comprising a network of projections which serve as said plurality of point contacts, while simultaneously allowing circulation of said gaseous atmosphere between and among said projections and said first face.
Claim 15
Dependent Claim
36 words
A probe according to claim 1, wherein said holding support and said tubular support are comprised of a refractory material different from the material of said solid electrolyte, and wherein said electrodes are comprised of platinum.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-02 | 1989-12-02 | 1990-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-02 | 1993-12-02 | 1994-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-02 | 1997-12-02 | 1998-06-03 | $7700.00 | Window Closed / Lapsed |