US3852037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective ionization detector
Assignee: PE Manufacturing GmbH
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Filing: 1973-05-04
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Granted: 1974-12-03
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Expires: 1993-05-04
Abstract
Abstract Selective ionization detector for halogen, phosphorus or nitrogen compounds of the type including a diode through which a sample gas being analyzed is fed by means of a carrier gas and an electrode including an alkali source in the form of a heated alkali-containing glass so that the electrode exhibits an increased ion emission upon the occurrence of such specific substances. The major improvement comprises maintaining the alkali glass in a heated softened state during operation of the detector. This may be accomplished by an electric resistance heater, the electric energy to which is precisely adjusted; or by the flame of a burner to which the sample gas and a combustible gas are supplied. The alkali-supplying glass is maintained negative with respect to the collecting electrode, while the (burner nozzle) emitting electrode may be maintained at the same potential as the glass body or also at a positive voltage relative thereto.
Inventors
- 👤 B Kolb
- 👤 J Bischoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:45
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/62; G01N30/64; G01N30/68
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
83 words
A SELECTTIVE IONIZATION DETECTOR OF THE TYPE FOR DETECTING HAOLGEN, PHOSPHORUS AND NITROGEN COMPOUNDS, COMPRISING A DIODE THROUGH WHICH A SAMPLE GAS UNDER ANALYSIS IS FED BY MEANS OF A TRANSFER GAS, AND AN ELECTRODE INCLUDING AN ALKALI SOURCE IN THE FORM OF A HEATED ALKALI-CONTAINING GLASS, SO THAT THE ELECTRODE EXHIBITS AN INCREASED ION EMISSION UPON OCCURRENCE OF SUCH SPECIFIC SUBSTANCES, THE IMPROVEMENT IN WHICH: SAID ALKALI SOURCE COMPRISES ALKALI GLASS MAINTAINED IN A HEATED SOFTENED STATE DURING OPERATION OF THE DETECTOR.
Claim 2
Dependent Claim
83 words
A SELECTTIVE IONIZATION DETECTOR OF THE TYPE FOR DETECTING HAOLGEN, PHOSPHORUS AND NITROGEN COMPOUNDS, COMPRISING A DIODE THROUGH WHICH A SAMPLE GAS UNDER ANALYSIS IS FED BY MEANS OF A TRANSFER GAS, AND AN ELECTRODE INCLUDING AN ALKALI SOURCE IN THE FORM OF A HEATED ALKALI-CONTAINING GLASS, SO THAT THE ELECTRODE EXHIBITS AN INCREASED ION EMISSION UPON OCCURRENCE OF SUCH SPECIFIC SUBSTANCES, THE IMPROVEMENT IN WHICH: SAID ALKALI SOURCE COMPRISES ALKALI GLASS MAINTAINED IN A HEATED SOFTENED STATE DURING OPERATION OF THE DETECTOR.
Claim 3
Dependent Claim
18 words
A selective ionization detector as claimed in claim 1, in which: said alkali glass is a sodium-enriched glasS.
Claim 4
Dependent Claim
18 words
A selective ionization detector as claimed in claim 1, in which: said alkali glass is a rubidium-enriched glass.
Claim 5
Dependent Claim
75 words
A selective ionization detector as claimed in claim 1, further comprising: a burner nozzle (18) to which a combustible gas and sample gas mixture is supplied: an alkali glass body (30) heatable up to softening mounted above said burner nozzle (18); a collecting electrode (42) arranged above said alkali glass body (30); said collecting electrode (42) and burner nozzle (18) being connected to an electrical potential positive with respect to the alkali glass body (30).
Claim 6
Dependent Claim
113 words
A selective ionization detector as claimed in claim 4, in which: a housing (60) encloses said burner nozzle (18); said alkali glass body (30) and said collecting electrode (42) are mounted by means of insulation (58) with respect to ground; said housing (60) is connected to a negative voltage source with respect to ground; said alkali glass body (30) is electrically connected to said housing (60); said collecting electrode (42) is mounted in the housing (60) but is electrically insulated therefrom and is connected to an amplifier (56) which is grounded; and said burner nozzle (18) is electrically connectable alternatively to the housing (60) or to ground by means of a switch means.
Claim 7
Dependent Claim
66 words
A selective ionization detector as claimed in claim 1, further comprising: a burner nozzle (18) to which a combustible gas and sample gas mixture is supplied; said alkali source is in the form of an alkali glass body (30), mounted above said burner nozzle (18) and heatable by an electric resistance heating means (40) to an extent sufficient for softening of said alkali glass body (30).
Claim 8
Dependent Claim
25 words
A selective ionization detector as claimed in claim 6, in which: the heating energy supplied to the electric resistance heating means (40) is precisely adjustable.
Claim 9
Dependent Claim
40 words
A selective ionization detector as claimed in claim 7, in which: independently of said precisely adjustable energy, a separate heating quantity sufficient for igniting the flame can be supplied to said heating means by actuation of a manually operated means.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |