Patent US3748906A successfully refreshed from Google Patents.
US3748906A
Expired / Lapsed
US
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Gas sampling apparatus
Assignee: Jones and Laughlin Steel Inc
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Filing: 1970-10-15
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Granted: 1973-07-31
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Expires: 1990-10-15
Abstract
Abstract Gas-sampling apparatus for sampling a dirt- and moisture-laden gas stream, such as blast-furnace top gas, cleaning the gas and delivering it to a gas analyzer employs parallel sampling probes and associated filter units to permit continuous alternate sampling and cleaning of the filters by back-flushing. The apparatus automatically ceases sampling whenever a foreign gas is introduced into the gas stream being sampled.
Inventors
- 👤 D Manka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:02
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/2247; G01N1/2258; G01N1/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
210 words
Gas sampling apparatus including sampling means comprising at least two sampling probes mounted in a first gas duct, for taking samples of a gas flowing therethrough, a filtering system including two filtering units, each probe being in fluid communication with a respective one of the filtering units, valve means in each of the filtering units for closing the passage of sample gas from the sampling means to the same, a sample gas delivery line for conveying filtered sample gas, a purging-gas delivery line connected to a source of purging gas, and means for alternately placing one of the filter units in fluid communication with the sample-gas delivery line and the other filter unit in communication with the purging gas delivery line, a second gas duct for selectively passing a second gas, said first and second gas ducts being in fluid communication, means in the second gas duct in communication with each of said valve means and said alternating means automatically causing each of said valve means to terminate the passage of sample gas from the sampling means into the gas filtering units and to terminate fluid communication between both filter units and the sample-gas and purging-gas lines, respectively, upon the passage of said second gas through said second gas duct.
Claim 2
Dependent Claim
210 words
Gas sampling apparatus including sampling means comprising at least two sampling probes mounted in a first gas duct, for taking samples of a gas flowing therethrough, a filtering system including two filtering units, each probe being in fluid communication with a respective one of the filtering units, valve means in each of the filtering units for closing the passage of sample gas from the sampling means to the same, a sample gas delivery line for conveying filtered sample gas, a purging-gas delivery line connected to a source of purging gas, and means for alternately placing one of the filter units in fluid communication with the sample-gas delivery line and the other filter unit in communication with the purging gas delivery line, a second gas duct for selectively passing a second gas, said first and second gas ducts being in fluid communication, means in the second gas duct in communication with each of said valve means and said alternating means automatically causing each of said valve means to terminate the passage of sample gas from the sampling means into the gas filtering units and to terminate fluid communication between both filter units and the sample-gas and purging-gas lines, respectively, upon the passage of said second gas through said second gas duct.
Claim 3
Dependent Claim
42 words
The gas-sampling apparatus of claim 6 wherein said automatic means in the second gas duct includes a pressure switch and actuator means for opening and closing each of said valve means in response to said second gas acting on said pressure switch.
Claim 4
Dependent Claim
90 words
The gas-sampling apparatus of claim 1 further including pump means for pumping sample gas through the apparatus to a gas analyzer, vacuum sensor means connected to said sample-gas delivery line between the filtering units and the pump means for sensing the pressure within the delivery line and providing a signal when the pressure in the delivery line falls below a preselected level indicating an interruption in sample gas flow, and pump control means for turning off the pump means in response to the signal provided by the vacuum sensor means.
Claim 5
Dependent Claim
56 words
The apparatus of claim 3 including means for removing water moisture from the sample gas and means located between the means for removing water moisture and the gas analyzer for causing the gas stream to divert from the gas analyzer when the water moisture level in the sample gas is in excess of a preselected value.
References Cited (Backward Citations)
US3457787A
Cited
US3495463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |