WO1994007130A1 - Planare polarographische sonde zur bestimmung des lambda-wertes von gasgemischen - Google Patents
Planare polarographische sonde zur bestimmung des lambda-wertes von gasgemischen Download PDFInfo
- Publication number
- WO1994007130A1 WO1994007130A1 PCT/DE1993/000838 DE9300838W WO9407130A1 WO 1994007130 A1 WO1994007130 A1 WO 1994007130A1 DE 9300838 W DE9300838 W DE 9300838W WO 9407130 A1 WO9407130 A1 WO 9407130A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- probe
- diffusion layer
- diffusion
- layer
- panel
- Prior art date
Links
- 239000000523 sample Substances 0.000 title claims abstract description 68
- 239000000203 mixture Substances 0.000 title claims abstract description 8
- 238000009792 diffusion process Methods 0.000 claims abstract description 64
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000004888 barrier function Effects 0.000 claims abstract description 6
- 238000002485 combustion reaction Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 230000008901 benefit Effects 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 2
- 239000007784 solid electrolyte Substances 0.000 abstract description 27
- 238000005086 pumping Methods 0.000 abstract 4
- 239000010410 layer Substances 0.000 description 51
- 238000009413 insulation Methods 0.000 description 15
- 239000011230 binding agent Substances 0.000 description 8
- 238000007650 screen-printing Methods 0.000 description 7
- 239000004020 conductor Substances 0.000 description 4
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000011241 protective layer Substances 0.000 description 4
- 229910001928 zirconium oxide Inorganic materials 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011195 cermet Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- YAPQBXQYLJRXSA-UHFFFAOYSA-N theobromine Chemical compound CN1C(=O)NC(=O)C2=C1N=CN2C YAPQBXQYLJRXSA-UHFFFAOYSA-N 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- UHOKSCJSTAHBSO-UHFFFAOYSA-N indanthrone blue Chemical compound C1=CC=C2C(=O)C3=CC=C4NC5=C6C(=O)C7=CC=CC=C7C(=O)C6=CC=C5NC4=C3C(=O)C2=C1 UHOKSCJSTAHBSO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229960004559 theobromine Drugs 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
- G01N27/4071—Cells and probes with solid electrolytes for investigating or analysing gases using sensor elements of laminated structure
Definitions
- the invention is based on a planar polarographic probe according to the preamble of the main claim.
- Known polarographic probes are used to determine the lambda value of gas mixtures, which denotes the ratio of total oxygen required for the complete combustion of the fuel to oxygen of the fuel-air mixture burning in a cylinder, the probes determining the oxygen content of the exhaust gas via a change in the limit current . Due to an inexpensive production, the production of planar polarographic probes which can be produced in ceramic film and screen printing technology has become established in practice in recent years.
- planar polarographic probes can be produced in a simple and rational manner, starting from foil-shaped oxygen-conducting solid electrolytes made of zirconium oxide, for example, which are coated on both sides with an inner and outer pump electrode with associated conductor tracks.
- the inner pump electrode is advantageously located in the edge region of a diffusion channel through which the measurement gas is supplied and which serves as a gas diffusion resistor.
- DE-OS 38 11 713 it is proposed, in order to improve the reproducibility of the diffusion resistance, to form the diffusion resistance by means of a porous sintered molded body inserted into the unsintered probe without an air gap. For this purpose, a recess is punched out of a solid electrolyte film, into which the porous molded body is then inserted. To supply the measuring gas, a diffusion channel is led from the outside across the sensor layers to the porous molded body, or the porous molded body is exposed on the end face of the sensor.
- a planar polarographic probe is known from EP-A-01 94 082, the diffusion resistance of which is formed by a gap running parallel to the solid electrolyte body and a porous insulation layer opposite the gap and covering the electrode.
- the measuring gas is fed to the electrode via the gap and the porous insulation layer.
- the production method in the known planar polarographic probes is complex. For example, a punching process is necessary to make the diffusion hole, the positioning accuracy of which is of particular importance for the sensor function.
- the formation of the diffusion zone with an air gap on the other hand requires additional screen printing steps. Each additional screen printing step means an additional drying step and thus the possibility of increased substrate length changes. This, in turn, has a negative effect on the positioning accuracy of the subsequent screen printing steps, which affects reproducibility, in particular when the probe is expanded with Nernst cells.
- the polarographic probe with the characterizing features of claim 1 and claim 10 has the advantage that it has a structure suitable for production, through which it is possible to reduce the screen printing steps in the manufacture of the probe. Since the construction of the probe does not require a diffusion hole or diffusion gap, the probe is insensitive to crack formation and delamination after sintering. At the same time, a higher mechanical stability of the probe is achieved, especially in the area of the diffusion zone. This enables better reproducibility of the diffusion resistance and the sensor function.
- the measures listed in the subclaims allow advantageous developments of the polarographic probe specified in the main claim. It is particularly advantageous that the diffusion layer is printed over the entire surface over the multiple use. As a result, the individual probe can be manufactured particularly cost-effectively. It is also advantageous that the diffusion resistance can be set by the correspondingly exposed area of the diffusion layer on the end faces of the probe.
- FIG. 1 shows the layout of a first embodiment of a probe according to the invention
- FIG. 2 shows the layout of a second embodiment of a probe according to the invention
- FIG. 3 shows a longitudinal section through the diffusion zone of the probes according to FIGS. 1 and 2
- FIG. 4 shows the layout of a probe third embodiment of one Probe according to the invention, which in addition to a pump cell and a heater unit has a Nernst cell and thus represents a broadband sensor
- FIG. 5 shows a longitudinal section through the diffusion zone of the broadband sensor according to FIG. 4
- FIG. 6 shows a plan view of a multiple use for producing the Probe according to the invention.
- the probe of the first exemplary embodiment consists of a pump cell A, an intermediate film B and a heater unit C.
- the pump cell A is constructed from a first solid electrolyte film 14 with a punched through hole 15, the insulation 12 with a recessed window 13 , over which an outer pump electrode 11 extends.
- the outer pump electrode 11 is arranged on the other side of the solid electrolyte film 14 opposite an inner pump electrode 16, over which a porous diffusion layer 19 is placed.
- a compensating layer 17 covers the surface of the solid electrolyte film 14 that is not covered by the diffusion layer 19.
- the outer pump electrode 11 is covered with a protective layer 10 over the entire surface.
- the two electrodes 11, 16 are guided at connections 21 via conductor tracks.
- the protective layer 10 consists, for example, of porous zirconium oxide.
- the intermediate film B serves to stabilize the probe and consists of a second solid electrolyte film 22, which is provided on both sides with an interlaminar binder layer 23.
- the heater unit C consists of a third solid electrolyte film 29 with punched-out contacts 25, a first heater insulation 26 and a second heater insulation 28, each with a gas-impermeable frame 26 'or 28' and the heater connections 31. Between the solid electrolyte film 29 and the heater connections 31, a further insulation 30 is provided, which also has through-holes 25.
- the heater unit C is also provided with an interlaminar binder layer 24 towards the stabilization unit B.
- a second embodiment is shown in Figure 2.
- This exemplary embodiment differs from the first exemplary embodiment only in that the diffusion layer 19 is not placed over the entire width of the probe, but is delimited by the compensating layer 17 at the edges of the probe.
- the compensating layer 17 is designed such that it has a recess 18 in the region of the diffusion layer 19. This ensures that the diffusion layer 19 is only exposed on the front end face of the probe.
- the probe of the first and second exemplary embodiment is produced, as shown in a section in the region of the diffusion layer 19 in longitudinal section in Figure 3 is shown. Both probes are designed as lean probes.
- the third exemplary embodiment shown in FIGS. 4 and 5 is a polarographic probe designed as a broadband sensor, which essentially differs from the previously described probes of FIGS. 1 and 2 in that it is additionally Pump cell A and the heater unit C has a Nernst cell N.
- the pump cell A consists of the solid electrolyte film 14, the outer pump electrode 11 with a trimming resistor 32 and the inner pump electrode 16.
- the insulation 12 is located between the solid electrolyte film 14 and the outer pump electrode 11 the gas-tight frame 12 '.
- a window 13 is provided in the insulation 12 in the area of the electrode 11 so that the outer pump electrode 11 comes into contact with the solid electrolyte film 14.
- a cover layer 33 with a further window 34 inserted therein lies over the outer pump electrode 11 in such a way that the connections 21 and the trimming resistor 32 are freely accessible and the outer pump electrode 11 lies inside the window 34.
- the protective layer 10 is placed over the window 34 in this embodiment.
- a further insulation 35 with a gas-tight frame 35 ′ and a further window 36 is arranged between the solid electrolyte foil 14 and the inner pump electrode 16.
- the inner pump electrode 16 is positioned within the window 36.
- the diffusion layer 19 is placed over the inner pump electrode 16.
- the compensation layer 17 is arranged over the diffusion layer 19 and over the region of the probe not covered with the diffusion layer 19.
- the compensation layer 17 has a recess 37, the purpose of which will be discussed in connection with the description of the Nernst cell N.
- the Nernst cell N is formed from a solid electrolyte film 40, a measuring electrode 41, a reference electrode 42 and a further solid electrolyte film 44 with a reference channel 45 and a reference gap 46.
- the measuring electrode 41 is positioned so that it is opposite the pump electrode 16 on the diffusion layer 19 lies.
- gas-permeable insulation 38 is arranged, through which the measuring gas reaches measuring electrode 41.
- the recess 37 made in the compensation layer 17 serves to establish an electrical connection between the measuring electrode 41 and the inner pump electrode 16 of the pump cell A with a contact 43. It is clear from this that the measuring electrode 41 is placed on the inner pump electrode 16 via the contact 43, wherein the contacting of the inner pump electrode 16 takes place via the via hole 15 made in the solid electrolyte film 14 with one of the connections 21.
- the reference electrode 42 is arranged on the underside of the solid electrolyte film 40 and is connected to the reference gap 46.
- the comparison atmosphere reaches the reference electrode 42 via the reference channel 45 and the reference gap 46.
- the layers 20, 23, 24 are the usual interlaminar binder layers with which the parts the probe are laminated together.
- through-hole 51 is introduced into the lower of the two layers 23 and into the layer 48 and into the solid electrolyte film 44, into which a connection pin 52 is inserted.
- the heater unit C is constructed similarly to the first two exemplary embodiments.
- the heater unit C accordingly consists of the solid electrolyte film 29, with through-holes 25, 51, the heater 27, the first insulation 26 with gas-tight frame 26 'positioned towards the Nernst cell N, the second insulation 28 with the gas-tight frame 28' as well , the further insulation 30, the interlaminar binder layer 24 and the heater connections 31.
- the through-hole 51 provided for contacting the reference electrode 42 is likewise laid through the layer 24, the insulation 26 and 28 and through the solid electrolyte film 29.
- the contact holes 51 are provided in order to connect the reference electrode 42 to the outside with a further connecting pin 53 at a third connection 54.
- the heater unit C is connected to the Nernst cell by laminating the layers 23 and 24 together.
- the intermediate film B used to stabilize the probe in the first and second exemplary embodiments is dispensed with in the third exemplary embodiment, since the Nernst cell N already has two solid electrolyte films 40 and 44.
- the manufacture of the polarographic probe according to the invention will be explained using the example of the probe schematically shown in FIGS. 1 and 3 and the basic illustration of a multiple use M shown in FIG.
- the multiple panel M contains several panels S arranged in parallel next to one another, which later form the polarographic probes.
- an approximately 0.3 to 0.6 mm thickness with Y.0 stabilized ZrO film in the unsintered state is used as the solid electrolyte film 14.
- the ZrO film is dimensioned such that a corresponding number of probes can be placed next to one another, so that a multiple use with, for example, 7 uses according to FIG. 6 is produced.
- the insulation 12, the outer and the inner pump electrodes 11 and 16 are applied to the solid electrolyte film 14 in a screen printing process printed in addition to the associated conductor tracks and the connections 21 using a conventional Pt cermet paste and the protective layer 10.
- the via hole 15 is likewise filled with the electrically conductive Pt-cermet layer.
- the diffusion layer 19 is printed over the width of the multiple panel M. It is important that the diffusion layer 19 on the front edge 61 of the panel S projects beyond it.
- porous zirconium oxide is used as the diffusion layer 19, the porosity of the diffusion layer 19 being generated by adding pore formers which burn, decompose or evaporate during the sintering process.
- Typical pore formers are, for example, thermal soot powder, plastics, e.g. based on polyurethane, salts, e.g. Ammonium carbonate and organic substances such as e.g. Theobromine and indanthrene blue.
- Such pore formers are added to the zirconium oxide printing paste in such an amount that a diffusion layer with a porosity of 10 to 50% is formed.
- the average pore diameter is preferably 5-50 microns.
- the area of an individual panel S not provided with the diffusion layer 19 is then printed with the compensation layer 17. Finally, the multiple panel is coated with the interlaminar binder 20.
- Suitable solid electrolyte films are the known 0-ion conductive solid electrolyte films based on oxides of tetravalent metals, such as in particular ZrO, CeO, HfO and ThO with a content of divalent alkaline earth oxides and / or preferably trivalent oxides of rare earths.
- the pump electrodes and the associated conductor tracks and connections consist, in a manner known per se, of pastes based on noble metals, in particular platinum or noble metal cerium et.
- the heater 27 is made of the same material.
- the three individual multiple benefits are laminated together by means of the interlaminar binder layers 20, 23 and 24. Then the individual probes are cut out of the multiple use. Due to the diffusion layer 19 extending over the entire multiple benefit, the diffusion layer 19 according to the first embodiment is exposed on the front and the two lateral end faces when used individually in benefit S. These three end faces form the diffusion barrier for the measuring gas.
- a diffusion layer 19 is printed on each panel S, the diffusion layer 19 of each panel also projecting beyond the front edge of each panel S.
- the two lateral areas of the diffusion layer 19 of the individual panels S are - as already explained in connection with the description of FIG. 2 - delimited by the compensation layer 17.
- the diffusion layer 19 is only exposed on the front end face.
- the blanks S are sintered at a temperature of approx. 1400 ° C.
- the probes obtained in this way can be mounted in housings known per se and used to determine the lambda value of gas mixtures.
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP93918975A EP0613555B1 (de) | 1992-09-24 | 1993-09-11 | Planare polarographische sonde zur bestimmung des lambda-wertes von gasgemischen |
DE59309532T DE59309532D1 (de) | 1992-09-24 | 1993-09-11 | Planare polarographische sonde zur bestimmung des lambda-wertes von gasgemischen |
JP50766594A JP3183348B2 (ja) | 1992-09-24 | 1993-09-11 | ガス混合物のラムダ値の測定のための平坦なポラログラフィーゾンデ |
US08/244,273 US5529677A (en) | 1992-09-24 | 1993-09-11 | Planar polarographic sensor for determining the lambda value of gas mixtures |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4231966A DE4231966A1 (de) | 1992-09-24 | 1992-09-24 | Planare polarograhische Sonde zur Bestimmung des Lambda-Wertes von Gasgemischen |
DEP4231966.8 | 1992-09-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994007130A1 true WO1994007130A1 (de) | 1994-03-31 |
Family
ID=6468711
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1993/000838 WO1994007130A1 (de) | 1992-09-24 | 1993-09-11 | Planare polarographische sonde zur bestimmung des lambda-wertes von gasgemischen |
Country Status (6)
Country | Link |
---|---|
US (1) | US5529677A (de) |
EP (1) | EP0613555B1 (de) |
JP (1) | JP3183348B2 (de) |
DE (2) | DE4231966A1 (de) |
ES (1) | ES2132250T3 (de) |
WO (1) | WO1994007130A1 (de) |
Cited By (1)
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WO2001029551A1 (de) * | 1999-10-22 | 2001-04-26 | Robert Bosch Gmbh | Planares sensorelement |
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US4657659A (en) * | 1985-05-09 | 1987-04-14 | Ngk Insulators, Ltd. | Electrochemical element |
EP0259175A2 (de) * | 1986-09-05 | 1988-03-09 | Ngk Insulators, Ltd. | Elektrochemischer Gassensor und Verfahren zu seiner Herstellung |
WO1989002074A1 (fr) * | 1987-08-27 | 1989-03-09 | Robert Bosch Gmbh | ELEMENT CAPTEUR POUR CAPTEURS A COURANT LIMITE DE DETERMINATION DE LA VALEUR lambda DE MELANGES GAZEUX |
WO1989002073A1 (en) * | 1987-08-25 | 1989-03-09 | Robert Bosch Gmbh | Limiting current-type sensor for polarographic measurement |
WO1989008840A1 (en) * | 1988-03-18 | 1989-09-21 | Robert Bosch Gmbh | ELEMENT FOR LIMIT-CURRENT SENSORS FOR DETERMINING THE lambda VALUE OF A GAS MIXTURE |
WO1990004171A1 (de) * | 1988-10-14 | 1990-04-19 | Robert Bosch Gmbh | SENSORELEMENT FÜR GRENZSTROMSENSOREN ZUR BESTIMMUNG DES μ-WERTES VON GASGEMISCHEN |
WO1990006506A1 (de) * | 1988-12-10 | 1990-06-14 | Robert Bosch Gmbh | SENSORELEMENT FÜR GRENZSTROMSENSOREN ZUR BESTIMMUNG DES μ-WERTES VON GASGEMISCHEN |
WO1990010862A1 (de) * | 1989-03-15 | 1990-09-20 | Robert Bosch Gmbh | SENSORELEMENT FÜR GRENZSTROMSENSOREN ZUR BESTIMMUNG DES μ-WERTES VON GASGEMISCHEN |
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EP0142992B1 (de) * | 1983-11-18 | 1990-07-18 | Ngk Insulators, Ltd. | Elektrochemische Vorrichtung mit einem Messfühlelement |
US4579643A (en) * | 1983-11-18 | 1986-04-01 | Ngk Insulators, Ltd. | Electrochemical device |
US4645572A (en) * | 1985-02-23 | 1987-02-24 | Ngk Insulators, Ltd. | Method of determining concentration of a component in gases and electrochemical device suitable for practicing the method |
DE3811713A1 (de) * | 1988-04-08 | 1989-10-19 | Bosch Gmbh Robert | Planare polarographische sonde zur bestimmung des (lambda)-wertes von gasgemischen |
-
1992
- 1992-09-24 DE DE4231966A patent/DE4231966A1/de not_active Withdrawn
-
1993
- 1993-09-11 DE DE59309532T patent/DE59309532D1/de not_active Expired - Lifetime
- 1993-09-11 ES ES93918975T patent/ES2132250T3/es not_active Expired - Lifetime
- 1993-09-11 US US08/244,273 patent/US5529677A/en not_active Expired - Lifetime
- 1993-09-11 JP JP50766594A patent/JP3183348B2/ja not_active Expired - Fee Related
- 1993-09-11 EP EP93918975A patent/EP0613555B1/de not_active Expired - Lifetime
- 1993-09-11 WO PCT/DE1993/000838 patent/WO1994007130A1/de active IP Right Grant
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US4657659A (en) * | 1985-05-09 | 1987-04-14 | Ngk Insulators, Ltd. | Electrochemical element |
EP0259175A2 (de) * | 1986-09-05 | 1988-03-09 | Ngk Insulators, Ltd. | Elektrochemischer Gassensor und Verfahren zu seiner Herstellung |
WO1989002073A1 (en) * | 1987-08-25 | 1989-03-09 | Robert Bosch Gmbh | Limiting current-type sensor for polarographic measurement |
WO1989002074A1 (fr) * | 1987-08-27 | 1989-03-09 | Robert Bosch Gmbh | ELEMENT CAPTEUR POUR CAPTEURS A COURANT LIMITE DE DETERMINATION DE LA VALEUR lambda DE MELANGES GAZEUX |
WO1989008840A1 (en) * | 1988-03-18 | 1989-09-21 | Robert Bosch Gmbh | ELEMENT FOR LIMIT-CURRENT SENSORS FOR DETERMINING THE lambda VALUE OF A GAS MIXTURE |
WO1990004171A1 (de) * | 1988-10-14 | 1990-04-19 | Robert Bosch Gmbh | SENSORELEMENT FÜR GRENZSTROMSENSOREN ZUR BESTIMMUNG DES μ-WERTES VON GASGEMISCHEN |
WO1990006506A1 (de) * | 1988-12-10 | 1990-06-14 | Robert Bosch Gmbh | SENSORELEMENT FÜR GRENZSTROMSENSOREN ZUR BESTIMMUNG DES μ-WERTES VON GASGEMISCHEN |
WO1990010862A1 (de) * | 1989-03-15 | 1990-09-20 | Robert Bosch Gmbh | SENSORELEMENT FÜR GRENZSTROMSENSOREN ZUR BESTIMMUNG DES μ-WERTES VON GASGEMISCHEN |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001029551A1 (de) * | 1999-10-22 | 2001-04-26 | Robert Bosch Gmbh | Planares sensorelement |
US6620302B1 (en) | 1999-10-22 | 2003-09-16 | Robert Bosch Gmbh | Planar sensor element |
Also Published As
Publication number | Publication date |
---|---|
EP0613555B1 (de) | 1999-04-21 |
JP3183348B2 (ja) | 2001-07-09 |
JPH07501404A (ja) | 1995-02-09 |
EP0613555A1 (de) | 1994-09-07 |
DE59309532D1 (de) | 1999-05-27 |
ES2132250T3 (es) | 1999-08-16 |
US5529677A (en) | 1996-06-25 |
DE4231966A1 (de) | 1994-03-31 |
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