US4272248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitric oxide interference free sulfur dioxide fluorescence analyzer
Assignee: Rosemount Inc
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Filing: 1979-12-26
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Granted: 1981-06-09
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Expires: 1999-12-26
Abstract
Abstract In a sulfur dioxide fluorescence analyzer, a method and apparatus for eliminating the fluorescence effects of nitric oxide is disclosed wherein a sample gas is mixed with a diluent which substantially quenches nitric oxide fluorescence.
Inventors
- 👤 Radhakrishna M. Neti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:33
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; G01N2201/00; G01N2201/12; G01N2201/121; G01N2201/1215; Y; Y10; Y10T; Y10T436/00; Y10T436/18; Y10T436/186; Y10T436/25; Y10T436/25125
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
64 words
A method for removing the fluorescence effect of nitric oxide in a fluorescence analyzer that measures sulfur dioxide comprising the steps of: providing a sample stream of gas; providing a diluent stream of gas containing at least one component having nitric oxide quenching properties; intermixing said sample stream and said diluent stream to form a mixture; and supplying said mixture to the fluorescence analyzer.
Claim 2
Independent Claim
64 words
A method for removing the fluorescence effect of nitric oxide in a fluorescence analyzer that measures sulfur dioxide comprising the steps of: providing a sample stream of gas; providing a diluent stream of gas containing at least one component having nitric oxide quenching properties; intermixing said sample stream and said diluent stream to form a mixture; and supplying said mixture to the fluorescence analyzer.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein said step of providing a diluent stream of gas comprises providing a diluent stream of gas having a high oxygen concentration.
Claim 4
Dependent Claim
26 words
The method of claim 1 wherein said step of providing a diluent gas stream comprises the step of providing humidified ambient air as said diluent stream.
Claim 5
Independent Claim
70 words
A method for removing the fluorescence effects of nitric oxide in a fluorescent analyzer system for measuring the sulfur dioxide content in a sample stream of gas comprising: providing a sample stream of gas; providing a diluent stream of gas containing a component exhibiting quenching properties for nitric oxide fluorescence; intermixing said sample stream and said diluent stream forming a sample mixture; and supplying said mixture to the fluorescent analyzer.
Claim 6
Independent Claim
70 words
A method for removing the fluorescence effects of nitric oxide in a fluorescent analyzer system for measuring the sulfur dioxide content in a sample stream of gas comprising: providing a sample stream of gas; providing a diluent stream of gas containing a component exhibiting quenching properties for nitric oxide fluorescence; intermixing said sample stream and said diluent stream forming a sample mixture; and supplying said mixture to the fluorescent analyzer.
Claim 7
Independent Claim
26 words
The method of claims 2, 3 or 4 also including the step of: receiving said mixture in a scrubber wherein hydrogen sulfide and mercaptans are removed.
Claim 8
Dependent Claim
22 words
The method of claim 5 including the additional step of receiving said mixture in a converter wherein polynuclear aromatic hydrocarbons are removed.
Claim 9
Dependent Claim
71 words
In combination: conduit means for receiving a sample stream of gas containing nitric oxide as an interferent; diluent means for providing a diluent stream of gas containing a component exhibiting quenching properties for quenching nitric oxide fluorescence; mixing means for intermixing said sample stream and said diluent stream to form a sample mixture; and analyzer means for receiving said sample mixture and analyzing said sample mixture for sulfur dioxide by fluorescence.
Claim 10
Dependent Claim
71 words
In combination: conduit means for receiving a sample stream of gas containing nitric oxide as an interferent; diluent means for providing a diluent stream of gas containing a component exhibiting quenching properties for quenching nitric oxide fluorescence; mixing means for intermixing said sample stream and said diluent stream to form a sample mixture; and analyzer means for receiving said sample mixture and analyzing said sample mixture for sulfur dioxide by fluorescence.
Claim 11
Dependent Claim
16 words
The combination of claim 7 wherein said diluent stream comprises a stream of gas containing oxygen.
Claim 12
Dependent Claim
31 words
The combination of claim 8 wherein the concentration of said oxygen is such that the oxygen to nitric oxide ratio of said sample mixture is at least approximately forty to one.
Claim 13
Dependent Claim
13 words
The combination of claim 7 wherein said diluent stream comprises humidified ambient air.
Claim 14
Dependent Claim
33 words
The combination of claim 10 wherein said humidified ambient air is such that the water vapor plus oxygen to nitric oxide ratio of said sample mixture is at least approximately forty to one.
Claim 15
Dependent Claim
20 words
The combination of claims 8 or 10 also including means for removing hydrogen sulfide and mercaptans from said sample stream.
Claim 16
Dependent Claim
21 words
The combination according to claims 8 or 10 also including means for removing hydrogen sulfide and mercaptans from said sample mixture.
Claim 17
Dependent Claim
16 words
The combination according to claims 8 or 10 also including means for removing polynuclear aromatic hydrocarbons.
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) | 1984-06-08 | 1984-12-08 | 1985-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-08 | 1988-12-08 | 1989-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-08 | 1992-12-08 | 1993-06-09 | $7700.00 | Window Closed / Lapsed |