US5217692A
Expired / Lapsed
US
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Gas sensor arrangement
Assignee: ETR ELEKTRONIK TECHNOLOGIE RUMP A Corp OF GERMANY GmbH
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Filing: 1991-06-10
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Granted: 1993-06-08
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Expires: 2011-06-10
Abstract
Abstract A gas sensor arrangement has at least a first sensor element which is primarily sensitive towards oxidizable gases and generates a corresponding measuring signal and an electric control and evaluation unit, wherein the measuring signal generated by the first sensor element is evaluated. In order to avoid inaccuracies when in addition to the oxidizable gases at the same time also reducible gases are present, the gas sensor arrangement is provided with at least one second sensor element, which is primarily sensitive to reducible gases and generates a corresponding measuring signal, which is fed to the control and evaluation unit for evaluation.
Inventors
- 👤 Hanns Rump
- 👤 Claus-Dieter Kohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:18
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01N33/0031; F; F02; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
109 words
A gas sensor system for he detection of an oxidizable gas in the presence of a reducing gas capable of masking the detection of said oxidizable gas, comprising: first sensor sensitive to an oxidizable gas which generates a signal representative of the concentration of the oxidizable gas, said signal capable of being masked by a reducible gas; a second sensor sensitive to said reducible gas; and a signal evaluator connected to said first and second sensors and provided with logic circuitry which eliminates from said signal any falsifying effect which may be created by the reducible gas thereby providing an output representing a true concentration of said oxidizable gas.
Claim 2
Dependent Claim
109 words
A gas sensor system for he detection of an oxidizable gas in the presence of a reducing gas capable of masking the detection of said oxidizable gas, comprising: first sensor sensitive to an oxidizable gas which generates a signal representative of the concentration of the oxidizable gas, said signal capable of being masked by a reducible gas; a second sensor sensitive to said reducible gas; and a signal evaluator connected to said first and second sensors and provided with logic circuitry which eliminates from said signal any falsifying effect which may be created by the reducible gas thereby providing an output representing a true concentration of said oxidizable gas.
Claim 3
Dependent Claim
79 words
The system defined in claim 1 wherein said second sensor includes at least one phthalocyanine sensor element and said first sensor comprises at least one metal-oxide sensor element, all of said sensor elements having respective outputs connected to said logic circuitry for logically combining outputs of said at least one phthalocyanine sensor element with outputs of said at least one metal-oxide sensor element and thereby providing at an output of said logic circuitry a measure of oxidizable gas concentration.
Claim 4
Dependent Claim
40 words
The system defined in claim 2, further comprising an air temperature sensor element and an air humidity sensor element connected to said logic circuitry for correcting the output of said logic circuitry in accordance with air temperature and humidity, respectively.
Claim 5
Dependent Claim
39 words
The system defined in claim 2 wherein said at least one metal-oxide sensor element and said at least one phthalocyanine sensor element are provided on a common heatable carrier separated thermally form one another by a SiO 2 gap.
Claim 6
Dependent Claim
24 words
The system defined in claim 2 wherein at lest one of said sensor elements is a thin-film sensor element applied to a polysilicon carrier.
Claim 7
Dependent Claim
28 words
The system defined in claim 2 wherein at lest one of said sensor elements is a thick-film sensor element applied together with a heater to an aluminum-oxide carrier.
Claim 8
Dependent Claim
21 words
The system defined in claim 2 wherein at least one of said metal oxide sensor elements is a tin-oxide sensor element.
Claim 9
Dependent Claim
38 words
The system defined in claim 1 wherein said first sensor comprises at least one tin-oxide sensor element and said second sensor is at lest one heated vanadate or vanadium-pentoxide sensor element responsive to the presence of nitrogen oxides.
Claim 10
Dependent Claim
15 words
The system defined in claim 8 wherein said second sensor contains iron, chromium or tungsten.
Claim 11
Dependent Claim
31 words
The system defined in claim 8 wherein said second sensor contains oxides of trivalent metals or mixtures thereof and includes SnO 2 , In 2 O 3 and In 3+ .
Claim 12
Dependent Claim
27 words
The system defined in claim 10 wherein said second sensor includes at least one second sensor element comprised of a mixture of chromium oxide and niobium oxide.
Claim 13
Dependent Claim
19 words
The system defined in claim 10 wherein said mixture consists essentially of 90% chromium oxide and 10% niobium oxide.
Claim 14
Dependent Claim
29 words
The system defined in claim 10 wherein said second sensor comprises at least one second sensor element comprised of an n-conductivity homogeneous semiconductor and a metal oxide gas-sensitive layer.
Claim 15
Dependent Claim
16 words
The system defined in claim 13 wherein said metal oxide gas-sensitive layer is reduced tin oxide.
Claim 16
Dependent Claim
19 words
The system defined in claim 13 wherein said second sensor element contains catalytic additive and a noble metal layer.
Claim 17
Dependent Claim
31 words
The system defined in claim 15 wherein said at least one second sensor element is composed of a heated wire of a catalytic material covered by platinum, gold, rhodium or palladium.
Claim 18
Dependent Claim
33 words
The system defined in claim 13 wherein said at least one second sensor element is composed of tin dioxide containing catalytic additives, zinc oxide with catalytic additives or iron oxide with catalytic additives.
Claim 19
Dependent Claim
25 words
The system defined in claim 13 wherein said at least one second sensor element comprises a mixture of a catalytic element and a noble metal.
Claim 20
Dependent Claim
23 words
The system defined in claim 13 wherein said at least one second sensor element contains catalytic quantities of palladium, platinum, rhodium or gold.
Claim 21
Dependent Claim
59 words
The system defined in claim 1 wherein said second sensor includes at least one second sensor element formed by a heated molybdate semiconductor, a heated zirconium oxide semiconductor, or a Clark cell with a solid electrolyte provided at a gas inlet side with a finely divided transition metal catalyst and formed with at lest one electrode for measuring conductivity.
Claim 22
Dependent Claim
16 words
The system defined in claim 20 wherein said finely divided transition metal is platinum or palladium.
Claim 23
Dependent Claim
22 words
The system defined in claim 20 wherein said at least one second sensor element is a molybdate semiconductor containing bismuth or iron.
Claim 24
Dependent Claim
19 words
The system defined in claim 20 wherein said at least one second sensor element is a sintered molybdate body.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-07 | 1996-12-07 | 1997-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-07 | 2000-12-07 | 2001-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-07 | 2004-12-07 | 2005-06-08 | $7700.00 | Window Closed / Lapsed |