DE10308394A1 - Sensor element of a gas sensor - Google Patents
Sensor element of a gas sensor Download PDFInfo
- Publication number
- DE10308394A1 DE10308394A1 DE10308394A DE10308394A DE10308394A1 DE 10308394 A1 DE10308394 A1 DE 10308394A1 DE 10308394 A DE10308394 A DE 10308394A DE 10308394 A DE10308394 A DE 10308394A DE 10308394 A1 DE10308394 A1 DE 10308394A1
- Authority
- DE
- Germany
- Prior art keywords
- sensor element
- gas mixture
- gas
- auxiliary electrode
- potential
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000007789 gas Substances 0.000 claims abstract description 129
- 239000000203 mixture Substances 0.000 claims abstract description 40
- 238000002485 combustion reaction Methods 0.000 claims abstract description 7
- 239000000470 constituent Substances 0.000 claims abstract 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 51
- 239000001301 oxygen Substances 0.000 claims description 29
- 229910052760 oxygen Inorganic materials 0.000 claims description 29
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 28
- 238000009792 diffusion process Methods 0.000 claims description 16
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 229910021529 ammonia Inorganic materials 0.000 claims description 5
- 238000000354 decomposition reaction Methods 0.000 claims description 4
- 230000003197 catalytic effect Effects 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 229930195733 hydrocarbon Natural products 0.000 claims 1
- 150000002430 hydrocarbons Chemical class 0.000 claims 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 20
- 239000007784 solid electrolyte Substances 0.000 description 11
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 11
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 10
- 230000004888 barrier function Effects 0.000 description 9
- 239000010410 layer Substances 0.000 description 9
- 238000005259 measurement Methods 0.000 description 9
- 229910052815 sulfur oxide Inorganic materials 0.000 description 9
- 239000000919 ceramic Substances 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 229910001260 Pt alloy Inorganic materials 0.000 description 5
- 239000000654 additive Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 229910001020 Au alloy Inorganic materials 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- LRDAUUGUXQIHED-UHFFFAOYSA-N N.[N]=O Chemical class N.[N]=O LRDAUUGUXQIHED-UHFFFAOYSA-N 0.000 description 1
- 229910001252 Pd alloy Inorganic materials 0.000 description 1
- 229910000629 Rh alloy Inorganic materials 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 150000003973 alkyl amines Chemical class 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000011195 cermet Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007850 degeneration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000003353 gold alloy Substances 0.000 description 1
- JUWSSMXCCAMYGX-UHFFFAOYSA-N gold platinum Chemical compound [Pt].[Au] JUWSSMXCCAMYGX-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000002346 layers by function Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- -1 oxygen ions Chemical class 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910000923 precious metal alloy Inorganic materials 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/4073—Composition or fabrication of the solid electrolyte
- G01N27/4074—Composition or fabrication of the solid electrolyte for detection of gases other than oxygen
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/417—Systems using cells, i.e. more than one cell and probes with solid electrolytes
- G01N27/419—Measuring voltages or currents with a combination of oxygen pumping cells and oxygen concentration cells
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0054—Ammonia
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
Es wird ein Sensorelement eines Gassensors beschrieben, das der Bestimmung der Konzentration mindestens eines Bestandteils eines Gasgemischs, insbesondere in Abgasen von Verbrennungsmotoren dient. Es beinhaltet mindestens eine Hilfselektrode (20, 20a, 24) und eine Messelektrode (26), die in direktem Kontakt mit dem Gasgemisch stehen, wobei ein mittels der Messelektrode (26) generiertes Signal der Bestimmung der Konzentration des Bestandteils dient. Zum Abgleich des Sensorelements wird an die Hilfselektrode (20, 20a, 24) zeitweise ein Potential angelegt, bei dem der im Gasgemisch enthaltene Bestandteil vollständig aus dem Gasgemisch entfernt wird.A sensor element of a gas sensor is described which is used to determine the concentration of at least one component of a gas mixture, in particular in exhaust gases from internal combustion engines. It contains at least one auxiliary electrode (20, 20a, 24) and one measuring electrode (26) which are in direct contact with the gas mixture, a signal generated by means of the measuring electrode (26) being used to determine the concentration of the constituent. To adjust the sensor element, a potential is temporarily applied to the auxiliary electrode (20, 20a, 24), in which the constituent contained in the gas mixture is completely removed from the gas mixture.
Description
Die Erfindung betrifft ein Sensorelement eines Gassensors und ein Verfahren zur Bestimmung der Konzentration eines Bestandsteils eines Gasgemischs nach dem Oberbegriff der unabhängigen Ansprüche.The invention relates to a sensor element of a gas sensor and a method for determining the concentration a component of a gas mixture according to the preamble of the independent claims.
Im Zuge sich verschärfender Umweltrichtlinien kommt der Sensorik im Bereich der Abgase von Verbrennungsmotoren eine wachsende Bedeutung zu. Dabei werden insbesondere Gassensoren auf Festelektrolytbasis eingesetzt, die hochselektiv die zu detektierenden gasförmigen Bestandteile im Abgas nachweisen. Eine besondere Herausforderung für Gassensoren stellen dabei die aggressiven Umgebungsbedingungen in Verbindung mit hohen Betriebstemperaturen im Abgas von Verbrennungsmotoren dar. Als Folge sind alle dem Gasgemisch direkt ausgesetzten Komponenten einem raschen Alterungs- und Degenerierprozess unterworfen. Insbesondere durch die Alterung der Elektroden des Gassensors kommt es nach einem relativ kurzen Zeitraum zu Signalveränderungen und somit zu ungenauen Messergebnissen.In the course of tightening The sensor technology in the area of exhaust gases from internal combustion engines comes up to environmental guidelines a growing importance too. In particular, gas sensors used on a solid electrolyte basis, which selectively detects the gaseous Detect components in the exhaust gas. A special challenge for gas sensors connect the aggressive environmental conditions with high operating temperatures in the exhaust gas of internal combustion engines As a result, all components are directly exposed to the gas mixture subjected to a rapid aging and degeneration process. In particular due to the aging of the electrodes of the gas sensor, after a relatively short period of time for signal changes and thus inaccurate Measurement results.
Aus der
Demgegenüber liegt der vorliegenden Erfindung die Aufgabe zugrunde, ein Sensorelement für einen Gassensor bereitzustellen, das auf einfache Weise einen zeitweiligen Nullabgleich ermöglicht und somit langfristig eine genaue Bestimmung mindestens eines Bestandteils eines Gasgemischs gewährleistet.In contrast, the present Invention, the object of a sensor element for Provide gas sensor that is a temporary one in a simple manner Zero adjustment enabled and thus long-term an exact determination of at least one component guaranteed a gas mixture.
Das erfindungsgemäße Sensorelement bzw. das der Erfindung zugrunde liegende Verfahren mit den kennzeichnenden Merkmalen der unabhängigen Ansprüche hat den Vorteil, dass es dauerhaft die Messung von Bestandteilen eines Gasgemischs gestattet. Dazu wird in vorteilhafter Weise zumindest zeitweise ein Abgleich des Sensorelements durchgeführt. Dabei wird aus einem in das Sensorelement eindiffundierenden Gasgemisch der zu bestimmende Bestandteil mittels einer Hilfselektrode elektrochemisch entfernt und das derart vorbehandelte Gasgemisch für einen Nullabgleich des Sensorelements herangezogen.The sensor element according to the invention or that of Method on which the invention is based with the characterizing features who has independent claims the advantage that it permanently measures the components of a Gas mixture allowed. This is advantageously done at least temporarily an adjustment of the sensor element is carried out. It turns from an in the gas mixture diffusing the sensor element the component to be determined electrochemically removed by means of an auxiliary electrode and so pretreated gas mixture for a zero adjustment of the sensor element is used.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des in den unabhängigen Ansprüchen angegebenen Sensorelements bzw. Verfahrens möglich. So ist es beispielsweise von Vorteil, wenn eine erste und eine zweite Hilfselektrode vorgesehen sind, die unterschiedliche Materialien aufweisen, wobei sich die Materialien hinsichtlich ihrer katalytischen Aktivität gegenüber einer Zersetzung des zu messenden Gases unterscheiden. Vorteilhafterweise sind beide Hilfselektroden elektrisch miteinander verbunden, so dass nur ein Anschluss für beide Elektroden vorgesehen werden muss.By the measures listed in the subclaims are advantageous developments and improvements in the independent claims Sensor element or method possible. For example, it is advantageous if a first and a second Auxiliary electrodes are provided which have different materials, the materials differ from one another in terms of their catalytic activity Distinguish the decomposition of the gas to be measured. advantageously, both auxiliary electrodes are electrically connected to each other, so that just a connector for both electrodes must be provided.
In einer besonders vorteilhaften Ausführungsform wird das Sensorelement nur dann in einem Abgleichmodus betrieben, wenn das Signal des Sensors einen vorbestimmten Wert unter- oder überschreitet. Dies vermeidet die Vornahme eines periodischen Abgleichs des Sensorelements und verlängert die Zeit, die das Sensorelement der Messung zur Verfügung steht.In a particularly advantageous embodiment the sensor element is only operated in an adjustment mode, when the signal from the sensor falls below or exceeds a predetermined value. This avoids the periodic adjustment of the sensor element and extended the time that the sensor element is available for the measurement.
Zeichnungdrawing
Drei Ausführungsbeispiele der Erfindung sind
in der Zeichnung dargestellt und in der nachfolgenden Beschreibung
näher erläutert. Es
zeigen
In
Die integrierte Form des planaren
keramischen Körpers
des Sensorelements
Das Sensorelement
Der innere Gasraum
Im inneren Gasraum
Die Hilfselektroden
Im inneren Gasraum
Um zu gewährleisten, dass an den ersten Hilfselektroden
Die weitere Hilfselektrode
Die Messelektrode
In den keramischen Grundkörper des
Sensorelements
Innerhalb des inneren Gasraums
Zusätzlich zu der beschriebenen
Betriebsweise zur Detektion eines zu bestimmenden reduzierbaren
Gases in einem ersten Zeitraum kann in einem zweiten Zeitraum eine
Betriebsweise vorgesehen sein, die gewährleistet, dass das Sensorelement geeicht
bzw. abgeglichen werden kann. Dabei wird das an den Elektroden
Der Abgleichmodus wird so lange durchgeführt, bis ein ausreichend genauer Nullabgleich erfolgt ist. Danach wird wieder die Detektion des zu messenden Gases durchgeführt. Der Abgleich kann periodisch erfolgen oder vorzugsweise immer dann, wenn das Messsignal des Sensorelements einen vorbestimmten Wert über- bzw. unterschreitet.The adjustment mode is carried out until a sufficiently precise zero adjustment has been made. After that, again the detection of the gas to be measured is carried out. The adjustment can be periodic take place or preferably whenever the measurement signal of the sensor element exceed a predetermined value or falls below.
Wird das beschriebene Sensorelement zur Bestimmung von oxidierbaren Gasen wie beispielsweise Ammoniak, Wasserstoff, Schwefelwasserstoff, Schwefelmonoxid oder von Alkylaminen verwendet, so wird deren Bestimmung wie folgt durchgeführt.Will the sensor element described for the determination of oxidizable gases such as ammonia, Hydrogen, hydrogen sulfide, sulfur monoxide or from alkylamines used, their determination is carried out as follows.
Das Potential, das an den Hilfselektroden
Das zu bestimmende oxidierbare Gas
wird dann an der Oberfläche
der weiteren Hilfselektrode
Um zu gewährleisten, dass an den ersten Hilfselektroden
An der weiteren Hilfselektrode
Auch bei der Bestimmung weiterer
reduzierend wirkender Gase ist eine Betriebsweise im Abgleichmodus
möglich.
Dazu wird in einem ersten Zeitraum die beschriebene Betriebsweise
zur Detektion des zu messenden Gases durchgeführt und in einem zweiten Zeitraum
ein Abgleichmodus. Dabei wird das an den Elektroden
Um die Oxidation des zu bestimmenden
Gases an den ersten Hilfselektroden
In
Die zweiten Hilfselektroden
Die Elektroden
Während
des Abgleichsmodus im zweiten Zeitraum werden die im Messbetrieb
an den Oberflächen
der ersten Hilfselektroden
Werden die ersten Hilfselektroden
Eine weitere Betriebsweise zum Nullabgleich des
Sensorelements besteht bei nicht elektrisch miteinander verbundenen
ersten und zweiten Hilfselektroden
Eine weitere Verbesserung der Messgenauigkeit
kann erzielt werden, indem der innere Gasraum
Ein weiteres Ausführungsbeispiel der vorliegenden
Erfindung ist in
Weist die Diffusionsbarriere
Alternativ zu einer amperometrischen
Bestimmung des zu messenden Gases mittels der Pumpzelle
Claims (11)
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10308394A DE10308394A1 (en) | 2003-02-27 | 2003-02-27 | Sensor element of a gas sensor |
DE50312612T DE50312612D1 (en) | 2003-02-27 | 2003-09-03 | Method for the determination of ammonia |
AT03019971T ATE464557T1 (en) | 2003-02-27 | 2003-09-03 | METHOD AND SENSOR ELEMENT FOR DETERMINING A GAS IN A GAS MIXTURE |
EP03019971A EP1452859B1 (en) | 2003-02-27 | 2003-09-03 | Method and sensing element for measuring a gas in a gas mixture |
DE50312610T DE50312610D1 (en) | 2003-02-27 | 2003-09-03 | Method and sensor element for determining a gas in a gas mixture |
EP03019972A EP1452860B1 (en) | 2003-02-27 | 2003-09-03 | Method for measuring ammonia |
AT03019972T ATE464558T1 (en) | 2003-02-27 | 2003-09-03 | METHOD FOR DETERMINING AMMONIA |
GB0404212A GB2399644A (en) | 2003-02-27 | 2004-02-25 | Zero point adjustment of the signal from a sensor element of a gas sensor |
FR0401881A FR2851824A1 (en) | 2003-02-27 | 2004-02-25 | ELECTROCHEMICAL EXHAUST GAS DETECTOR |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10308394A DE10308394A1 (en) | 2003-02-27 | 2003-02-27 | Sensor element of a gas sensor |
Publications (1)
Publication Number | Publication Date |
---|---|
DE10308394A1 true DE10308394A1 (en) | 2004-09-09 |
Family
ID=32049678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE10308394A Withdrawn DE10308394A1 (en) | 2003-02-27 | 2003-02-27 | Sensor element of a gas sensor |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE10308394A1 (en) |
FR (1) | FR2851824A1 (en) |
GB (1) | GB2399644A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006136509A1 (en) * | 2005-06-23 | 2006-12-28 | Siemens Vdo Automotive Ag | Gas sensor |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2885336B2 (en) * | 1994-04-21 | 1999-04-19 | 日本碍子株式会社 | Method and apparatus for measuring NOx concentration in gas to be measured |
JP3470012B2 (en) * | 1996-05-30 | 2003-11-25 | 日本碍子株式会社 | Gas analyzer and its calibration method |
JP3621827B2 (en) * | 1997-05-02 | 2005-02-16 | 日本特殊陶業株式会社 | Method and apparatus for measuring nitrogen oxide concentration |
DE19912102C2 (en) * | 1999-03-18 | 2002-09-05 | Bosch Gmbh Robert | Electrochemical gas sensor |
DE19926139A1 (en) * | 1999-06-09 | 2000-12-14 | Volkswagen Ag | Calibration of a NOx sensor |
DE10116184A1 (en) * | 2001-03-31 | 2002-10-10 | Bosch Gmbh Robert | Method and device for detecting the concentration of an oxygen-containing compound in a measuring gas |
-
2003
- 2003-02-27 DE DE10308394A patent/DE10308394A1/en not_active Withdrawn
-
2004
- 2004-02-25 GB GB0404212A patent/GB2399644A/en not_active Withdrawn
- 2004-02-25 FR FR0401881A patent/FR2851824A1/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006136509A1 (en) * | 2005-06-23 | 2006-12-28 | Siemens Vdo Automotive Ag | Gas sensor |
Also Published As
Publication number | Publication date |
---|---|
GB0404212D0 (en) | 2004-03-31 |
FR2851824A1 (en) | 2004-09-03 |
GB2399644A (en) | 2004-09-22 |
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Legal Events
Date | Code | Title | Description |
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8141 | Disposal/no request for examination |