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Patent US4828673A successfully refreshed from Google Patents.
US4828673A
Expired / Lapsed
US
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Apparatus for measuring combustible gas concentration in flue gas
Assignee: Yokogawa Electric Corp
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Filing: 1988-03-01
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Granted: 1989-05-09
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Expires: 2008-03-01
Abstract
Abstract An apparatus having a combustible gas detecting sensor and an O 2 gas detecting sensor which are provided separately of each other, the combustible gas detecting sensor made of zirconia solid electrolyte and having an electrode exposed to reference gas and a molybdenum disilicide electrode exposed to gas to be measured, wherein the combustible gas detecting sensor is heated to an operating temperature which is different from the heating temperature of the O 2 detecting sensor, thereby to measure the concentration of a wide range of combustible gas in the gas to be measured which is in an O 2 gas rich state, by calculation based on the respective outputs of the two sensors.
Inventors
- 👤 Masato Maeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:23
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/417; G01N27/403; G01N27/406; G01N27/407; G01N27/4073; G01N27/4074
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
85 words
An apparatus for measuring a combustible gas concentration in a flue gas comprising a combustible gas detecting zirconia solid electrolytic sensor comprising one electrode to which a reference gas is applied and another electrode to which a gas to be measured is applied, said other electrode being a molybdenum disilicide electrode film, whereby wide concentration of combustible gas in said gas to be measured is measured on the basis of output from said sensor and O 2 gas concentration in said gas to be measured.
Claim 2
Independent Claim
85 words
An apparatus for measuring a combustible gas concentration in a flue gas comprising a combustible gas detecting zirconia solid electrolytic sensor comprising one electrode to which a reference gas is applied and another electrode to which a gas to be measured is applied, said other electrode being a molybdenum disilicide electrode film, whereby wide concentration of combustible gas in said gas to be measured is measured on the basis of output from said sensor and O 2 gas concentration in said gas to be measured.
Claim 3
Independent Claim
119 words
An apparatus for measuring a combustible gas concentration in a flue gas comprising a combustible gas-detecting zirconia solid electrolytic sensor comprising one electrode to which a reference gas is applied and another electrode to which a gas to be measured is applied, said another electrode being molybdenum disilicide electrode film; and an O 2 gas detecting sensor, both said sensors being inserted directly into a duct through which said gas to be measured flows, thereby to measure wide concentrations of combustible gas in said gas to be measured which is in an O 2 gas rich state by calculation made on the basis of respective outputs of said combustible gas detecting sensor and said O 2 gas detecting sensor.
Claim 4
Independent Claim
119 words
An apparatus for measuring a combustible gas concentration in a flue gas comprising a combustible gas-detecting zirconia solid electrolytic sensor comprising one electrode to which a reference gas is applied and another electrode to which a gas to be measured is applied, said another electrode being molybdenum disilicide electrode film; and an O 2 gas detecting sensor, both said sensors being inserted directly into a duct through which said gas to be measured flows, thereby to measure wide concentrations of combustible gas in said gas to be measured which is in an O 2 gas rich state by calculation made on the basis of respective outputs of said combustible gas detecting sensor and said O 2 gas detecting sensor.
Claim 5
Independent Claim
191 words
An apparatus for measuring a combustible gas concentration in a flue gas comprising a combustible gas detecting zirconia solid electrolytic sensor comprising one electrode to which a reference gas is applied and another electrode to which a gas to be measured is applied, said other electrode being a molybdenum disilicide film; and an O 2 gas detecting zirconia solid electrolytic sensor comprising one electrode to which a reference gas is applied and another electrode to which the gas to be measured is applied, the other electrode being of a platinum film, wherein said two sensors being inserted directly into a duct through which said gas to be measured flows, wherein said O 2 gas detecting sensor is heated to an operating temperature at which said sensor becomes an oxygen ion conductor, wherein said combustible gas detecting sensor is heated to a lower temperature than said operating temperature, thereby to measure wide concentration of combustible gas in said gas to be measured which is in an O 2 gas rich state, by calculation made on the basis of respective outputs from said combustible gas detecting sensor and said O 2 detecting sensor.
Claim 6
Independent Claim
191 words
An apparatus for measuring a combustible gas concentration in a flue gas comprising a combustible gas detecting zirconia solid electrolytic sensor comprising one electrode to which a reference gas is applied and another electrode to which a gas to be measured is applied, said other electrode being a molybdenum disilicide film; and an O 2 gas detecting zirconia solid electrolytic sensor comprising one electrode to which a reference gas is applied and another electrode to which the gas to be measured is applied, the other electrode being of a platinum film, wherein said two sensors being inserted directly into a duct through which said gas to be measured flows, wherein said O 2 gas detecting sensor is heated to an operating temperature at which said sensor becomes an oxygen ion conductor, wherein said combustible gas detecting sensor is heated to a lower temperature than said operating temperature, thereby to measure wide concentration of combustible gas in said gas to be measured which is in an O 2 gas rich state, by calculation made on the basis of respective outputs from said combustible gas detecting sensor and said O 2 detecting sensor.
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) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |