US3871981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
In-situ oxygen detector
Assignee: Elsag International BV
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Filing: 1973-07-02
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Granted: 1975-03-18
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Expires: 1993-07-02
Abstract
Abstract A measuring apparatus having a self-contained reference atmosphere and utilizing thick film thermocouples to measure the operating temperature of the detector cell. An embodiment of the detector is provided with heating means and enclosed so as to be capable of operation in a high velocity varying temperature atmosphere. In another embodiment, the operating temperature of the detector cell is measured by one thick-film thermocouple inside and another outside the closed end of the electrolyte tube of the detector. The outputs of the two thermocouples are electrically parallel connected to provide an average of the two thermocouple readings.
Inventors
- 👤 Louis R Flais
- 👤 Ralph G Gentle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:06
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/4067
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
190 words
AN IN-SITU OXYGEN DETECTOR COMPRISING AN ELECTROLYTE TUBE OF ZIRCONIUM - OXIDE FORMED SO AS TO HAVE ONE END OPEN AND ONE END CLOSED; A FIRST POROUS PLATINUM ELECTRODE STRIP BONDED TO THE OUTSIDE OF SAID TUBE, EXTENDING PARTIALLY ACROSS THE CLOSED END AND CONTINUING ALONG THE SIDE OF SAID TUBE TO A FIRST CONTACT TERMINAL ON THE OUTSIDE OF SAID TUBE; A SECOND POROUS PLATINUM ELECTRODE STRIP BONDED TO THE INSIDE OF SAID TUBE, EXTENDING PARTIALLY ACROSS THE CLOSED END OF SAID TUBE SO AS TO OVERLAP SAID FIRST ELECTRODE AND CONTINUING ALONG THE INSIDE, OVER THE OPEN END AND PARTIALLY ON THE OUTSIDE OF SAID TUBE TO A SECOND CONTACT TERMINAL ON THE OUTSIDE OF SAID TUBE; MEANS SEALING THE OPEN END OF SAID TUBE INCLUDING A ZIRCONIA CAP; A SELF-CONTAINED REFERENCE ATMOSPHERE SEALED INSIDE SAID TUBE BY SAID SEALING MEANS; A FIRST THERMOCOUPLE LOCATED ON THE OUTSIDE CLOSED END OF SAID ELECTROLYTE TUBE SO AS TO DETECT THE TEMPERATURE OF SAID FIRST ELECTRODE; AND A SECOND THERMOCOUPLE LOCATED ON THE INSIDE CLOSED END OF SAID ELECTROLYTE TUBE SO AS TO DETECT THE TEMPERATURE OF SAID SECOND ELECTRODE.
Claim 2
Dependent Claim
190 words
AN IN-SITU OXYGEN DETECTOR COMPRISING AN ELECTROLYTE TUBE OF ZIRCONIUM - OXIDE FORMED SO AS TO HAVE ONE END OPEN AND ONE END CLOSED; A FIRST POROUS PLATINUM ELECTRODE STRIP BONDED TO THE OUTSIDE OF SAID TUBE, EXTENDING PARTIALLY ACROSS THE CLOSED END AND CONTINUING ALONG THE SIDE OF SAID TUBE TO A FIRST CONTACT TERMINAL ON THE OUTSIDE OF SAID TUBE; A SECOND POROUS PLATINUM ELECTRODE STRIP BONDED TO THE INSIDE OF SAID TUBE, EXTENDING PARTIALLY ACROSS THE CLOSED END OF SAID TUBE SO AS TO OVERLAP SAID FIRST ELECTRODE AND CONTINUING ALONG THE INSIDE, OVER THE OPEN END AND PARTIALLY ON THE OUTSIDE OF SAID TUBE TO A SECOND CONTACT TERMINAL ON THE OUTSIDE OF SAID TUBE; MEANS SEALING THE OPEN END OF SAID TUBE INCLUDING A ZIRCONIA CAP; A SELF-CONTAINED REFERENCE ATMOSPHERE SEALED INSIDE SAID TUBE BY SAID SEALING MEANS; A FIRST THERMOCOUPLE LOCATED ON THE OUTSIDE CLOSED END OF SAID ELECTROLYTE TUBE SO AS TO DETECT THE TEMPERATURE OF SAID FIRST ELECTRODE; AND A SECOND THERMOCOUPLE LOCATED ON THE INSIDE CLOSED END OF SAID ELECTROLYTE TUBE SO AS TO DETECT THE TEMPERATURE OF SAID SECOND ELECTRODE.
Claim 3
Dependent Claim
49 words
An in-situ oxygen detector as set forth in claim 1 wherein said first and second electrode strips overlap in the central portion of the closed end of said tube so as to form an electrode pair for ion conduction on the center of the closed end of said tube.
Claim 4
Dependent Claim
46 words
An in-situ oxygen detector as set forth in claim 2 wherein said self-contained reference atmosphere includes a metal-metal oxide powder, said metal reacting with any oxygen migrating through said zirconium-oxide tube to form the metal oxide and thereby maintaining said reference atmosphere''s oxygen partial pressure constant.
Claim 5
Dependent Claim
39 words
An in-situ oxygen detector as set forth in claim 3 wherein said sealing means includes the brazing of said zirconia cap to said electrolyte tube with a braze alloy capable of maintaining said brazed seal at 1500*F ambient temperature.
Claim 6
Dependent Claim
25 words
An in-situ oxygen detector as set forth in claim 1 wherein said first and second thermocouples are thickfilm thermocouples from 0.1 to 1.0 mils thick
Claim 7
Dependent Claim
127 words
An in-situ oxygen detector as set forth in claim 1 including: means for enclosing said electrolyte tube so as to leave the closed end of said tube exposed to an atmosphere of unknown oxygen content; a first means for heating a portion of the enclosed length of said electrolyte tube near the closed end of said tube, said first heating means being located along the length of said tube and internal to said enclosing means; a second means for heating the unknown atmosphere and the closed end of said tube located opposite the closed end of said tube; and means for controlling said first and second heating means so that the temperature sensed by said first and second thermocouples is maintained at a substantIally indentical temperature level.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |