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US4279142A
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US
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Technique for in situ calibration of a gas detector
Assignee: Rosemount Inc
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Filing: 1979-08-31
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Granted: 1981-07-21
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Expires: 1999-08-31
Abstract
Abstract In a gas measuring probe assembly having a gas sensing device located within a tubular housing positioned within a gas environment to be monitored, a tubular calibration gas flow pattern is established within the tubular housing substantially parallel to the walls of the tubular housing to sweep the monitored gas environment from the tubular housing and expose the gas sensing device to a calibration gas mixture substantially free of the monitored gas environment. This technique permits the in situ calibration of gas detectors, and is especially useful in calibrating stack gas monitoring probes.
Inventors
- 👤 William H. McIntyre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:10
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0006; G01N27/00; G01N27/26; G01N27/416; G01N27/417; G01N27/4175
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A method for calibrating a gas measuring probe having a gas sensing device located within a housing for generating electrical signals in response to the gas constituents of a monitored gas, comprising the steps of, flowing calibration gas into said housing, and deflecting the flow of said calibration gas to produce a spiral tubular calibration gas flow pattern within said housing to sweep said monitored gas from said gas sensing device and expose said gas sensing device to said calibration gas.
Claim 2
Independent Claim
81 words
A method for calibrating a gas measuring probe having a gas sensing device located within a housing for generating electrical signals in response to the gas constituents of a monitored gas, comprising the steps of, flowing calibration gas into said housing, and deflecting the flow of said calibration gas to produce a spiral tubular calibration gas flow pattern within said housing to sweep said monitored gas from said gas sensing device and expose said gas sensing device to said calibration gas.
References Cited (Backward Citations)
US3729979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |