Patent US3646803A successfully refreshed from Google Patents.
US3646803A
Expired / Lapsed
US
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Paramagnetic gas-measuring device
Assignee: MSA Italiana SpA
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Filing: 1970-03-06
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Granted: 1972-03-07
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Expires: 1990-03-06
Abstract
Abstract The ends of a hollow cylindrical magnet are closed by closures, from which pole pieces extend toward each other with their inner ends spaced apart to form an airgap. The device is provided with an inlet and an outlet for a gaseous mixture that may contain a paramagnetic gas, such as oxygen or nitricoxide. Four electrical resistance heating elements are spaced along a substantially diametric line extending through the gap, with a pair of the elements disposed at each side of the gap. Wires lead from each element out of the magnet for connecting them in an electric circuit to heat them and the surrounding gaseous mixture. This heating, when a paramagnetic gas is present, creates a magnetic wind that moves the gaseous mixture into the gap between the two pairs of heating elements and out of it across them for removing heat from the two innermost elements and transferring it to the outermost elements. The difference in temperature between the inner and outer elements is a measure of the concentration of the paramagnetic gas in the mixture.
Inventors
- 👤 Emilio G Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:56
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/74
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
222 words
A device for use in measuring the concentration of a paramagnetic gas in a gaseous mixture, comprising a hollow cylindrical magnet, closures secured to the ends of the magnet, pole pieces extending centrally from said closures toward each other with their inner ends spaced apart to form a gap, the pole pieces being spaced inwardly from the encircling wall of the magnet, said device being provided with an inlet and an outlet to the annular space between the pole pieces and the cylindrical magnet for the gaseous mixture being analyzed, four electricalresistance-heating elements spaced along a substantially diametric line extending through said gap, a pair of said elements being disposed at each side of the gap, and wires leading from each heating element out of the magnet for connecting the elements in an electric circuit to heat them and thereby the gaseous mixture, whereby to create in the presence of a paramagnetic gas a magnetic wind moving some of the gaseous mixture into said gap between the two pairs of heating elements and out of the gap across those elements for removing heat from the two innermost elements and transferring it to the two outermost elements, said device being adapted to be electrically connected to means for measuring the difference in temperature between said innermost heating elements and said outermost heating elements.
Claim 2
Independent Claim
222 words
A device for use in measuring the concentration of a paramagnetic gas in a gaseous mixture, comprising a hollow cylindrical magnet, closures secured to the ends of the magnet, pole pieces extending centrally from said closures toward each other with their inner ends spaced apart to form a gap, the pole pieces being spaced inwardly from the encircling wall of the magnet, said device being provided with an inlet and an outlet to the annular space between the pole pieces and the cylindrical magnet for the gaseous mixture being analyzed, four electricalresistance-heating elements spaced along a substantially diametric line extending through said gap, a pair of said elements being disposed at each side of the gap, and wires leading from each heating element out of the magnet for connecting the elements in an electric circuit to heat them and thereby the gaseous mixture, whereby to create in the presence of a paramagnetic gas a magnetic wind moving some of the gaseous mixture into said gap between the two pairs of heating elements and out of the gap across those elements for removing heat from the two innermost elements and transferring it to the two outermost elements, said device being adapted to be electrically connected to means for measuring the difference in temperature between said innermost heating elements and said outermost heating elements.
Claim 3
Dependent Claim
33 words
A device according to claim 1, in which said wires support the heating elements and extend out through one of said closures, and said inlet and outlet are located in the other closure.
Claim 4
Dependent Claim
40 words
A device according to claim 1, in which one of said pole pieces is provided with a plurality of longitudinal passages there through receiving said wires, said device including insulating members mounted in said passages and sealing the wires therein.
Claim 5
Dependent Claim
52 words
A device according to claim 1, in which one of said closures is provided with a central opening in which the outer end of one of the pole pieces fits, and said outer end of the pole piece is provided with a flange secured to the outer surface of said one closure.
Claim 6
Dependent Claim
25 words
A device according to claim 1, including nonmagnetic means encircling one of the pole pieces and filling the space between it and the surrounding magnet.
Claim 7
Dependent Claim
27 words
A device according to claim 5, in which said means include an internally tapered cylindrical sleeve fitting around the pole piece, and a ring encircling the sleeve.
Claim 8
Dependent Claim
66 words
A device according to claim 1, in which said pole pieces are tapered toward each other, said device including an internally tapered nonmagnetic sleeve fitting around each pole piece and having a cylindrical outer surface, insulating tubes surrounding said wires, and means sealing the wires in the tubes, one of said pole pieces and the sleeve surrounding it being provided with longitudinal passages containing said tubes.
Claim 9
Dependent Claim
29 words
A device according to claim 1, including means for measuring the difference in temperature between the inner heating elements and the outer ones when a paramagnetic gas is present.
Claim 10
Dependent Claim
28 words
A device according to claim 1, in which said heating elements havE terminal wires and are supported by them out of contact with the rest of said device.
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |