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DE3503720A1 - Instrument for the continuous photometric determination of pollutant components in exhaust gases and/or for influencing exhaust-gas temperatures - Google Patents

Instrument for the continuous photometric determination of pollutant components in exhaust gases and/or for influencing exhaust-gas temperatures

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Publication number
DE3503720A1
DE3503720A1 DE19853503720 DE3503720A DE3503720A1 DE 3503720 A1 DE3503720 A1 DE 3503720A1 DE 19853503720 DE19853503720 DE 19853503720 DE 3503720 A DE3503720 A DE 3503720A DE 3503720 A1 DE3503720 A1 DE 3503720A1
Authority
DE
Germany
Prior art keywords
exhaust
exhaust gases
exhaust gas
light source
transmitter
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Withdrawn
Application number
DE19853503720
Other languages
German (de)
Inventor
Thomas Dipl.-Ing. 3300 Braunschweig Bennöhr
Dieter Dipl.-Ing. 3302 Cremlingen Mehlitz
Reinhard Dipl.-Chem. 3300 Braunschweig Siekmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MSR GES fur MESS STEUERUNGS U
Original Assignee
MSR GES fur MESS STEUERUNGS U
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MSR GES fur MESS STEUERUNGS U filed Critical MSR GES fur MESS STEUERUNGS U
Priority to DE19853503720 priority Critical patent/DE3503720A1/en
Publication of DE3503720A1 publication Critical patent/DE3503720A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1451—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the sensor being an optical sensor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N2021/3185—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry typically monochromatic or band-limited
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/85—Investigating moving fluids or granular solids
    • G01N2021/8578—Gaseous flow

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Immunology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pathology (AREA)
  • Health & Medical Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The patent application relates to an instrument for the continuous photometric determination of pollutant components in exhaust gases and/or for influencing exhaust-gas temperatures, preferably for exhaust gases of internal combustion engines. It can be used advantageously, inter alia, for monitoring the function of exhaust-gas catalysts and for influencing their operating temperatures. On a partially nozzle-shaped exhaust gas pipe, a monochromatic light source as a transmitter and a measuring sensor as a receiver are positioned in installation spaces where the pressure is higher than that of the exhaust-gas stream. The airstream generated by the pressure gradient ensures that the transmitter and the receiver remain free of deposits of exhaust-gas components. It also has the effect that, after it enters the exhaust-gas stream, the exhaust gases are cooled. The measurement method is known per se. The exhaust gases are passed between the transmitter and the receiver. The optical absorption spectrum, for example for NO2, shows a distinctive extreme value at a wavelength between 400 nm and 500 nm. If the emission wavelength of the transmitter is located in this region, signals will be produced at the receiver in the form of current and/or voltage values which are proportional to the NO2 content of the exhaust gases flowing between the transmitter and the receiver. These signals can be displayed or ... for the purpose of controlling motor units or motor auxiliary units in order to reduce certain exhaust-gas components ... Original abstract incomplete.

Description

BESCHREIBUNGDESCRIPTION

Gerät zur kontinuierlichen fotometrischen Bestimmung von Schadstoff-Komponenten in Abgasen und/oder zur Beeinflussung von Abgastemperaturen Es sind derzeit keine auf fotometrischer Basis arbeitende Geräte bekannt, die in Großserienfertigung für die Messung von spezifischen Schadstoff-Komponenten in Abgasen, vorzugsweise von Verbrennungskraftmaschinen, geeignet wären. Die Gründe hierfür liegen im wesentlichen im hohen Preis für monochromatische Lichtquellen bestimmter Wellenlängen und in der Tatsache, daß durch Ablagerung von Abgaskomponenten (besonders Ruß) auf Lichtquelle und Meßsensor keine zuverlässigen Meßergebnisse, zumindest über längere Zeit, erzielt werden können. Es werden jedoch zunehmend preiswerte Fotodioden angeboten, die schmalbandig in diversen Wellenlängen emittieren, so daß die Frage des Preises an Bedeutung verliert.Device for the continuous photometric determination of pollutant components in exhaust gases and / or to influence exhaust gas temperatures There are currently none known working on a photometric basis, which are in mass production for the measurement of specific pollutant components in exhaust gases, preferably of Internal combustion engines would be suitable. The reasons for this are essentially in the high price for monochromatic light sources of certain wavelengths and in the fact that due to the deposition of exhaust gas components (especially soot) on the light source and measuring sensor does not achieve reliable measurement results, at least over a long period of time can be. However, there are increasingly inexpensive photodiodes offered that have a narrow band emit in various wavelengths, so that the question of price becomes less important.

Erfindunsgemäß werden Lichquelle und Sensor in Bauräumen untergebracht, in denen gegenüber dem Abgasstrom Oberdruck herrscht, so daß keine Abgaspartikel in diese Bauräume eindringen können, womit auch das Problem der Verschmutzung von Sensoren und Lichtquellen nicht mehr relevant ist.According to the invention, the light source and sensor are housed in installation spaces, in which there is overpressure in relation to the exhaust gas flow, so that no exhaust gas particles can penetrate into these installation spaces, which also the problem of contamination of Sensors and light sources is no longer relevant.

Besondere Bedeutung gewinnt die Patentanmeldung im Zusammenhang mit der überwachung der Funktion von Abgaskatalysatoren für Otto-Motoren. Es ist bekannt, daß die einwandfreie Funktion von Abgaskatalysatoren durch vorsätzliche Eingriffe, durch zu heiße Abgase, z.B. im Vollastbetrieb der Motoren, durch ungeeignete, vornehmlich bleihaltige Kraftstoffe und durch Erreichen der Lebensdauer der Katalysatoren beeinflußt wird. Der Gesetzgeber hat deshalb eine jährliche Überprüfung der Funktion von Kraftfahrzeug-Katalysatoren vorgesehen. Erfindungsgemäß kann diese Überprüfung entfallen, wenn das Gerät als Zusatzeinrichtung für Abgaskatalysatoren nach Art der ebenfalls gesetzlich vorgeschriebenen Fahrtenschreiber für Lastkraftwagen verplombt wird und die einwandfreie Funktion der Katalysatoren durch eine geeignete Anzeige bei jeder polizeilichen Straßenverkehrskontrolle überprüfbar ist.The patent application is of particular importance in connection with the monitoring of the function of catalytic converters for gasoline engines. It is known, that the perfect functioning of catalytic converters through deliberate interventions, by excessively hot exhaust gases, e.g. when the engines are running at full load, by unsuitable, primarily leaded fuels and by Reaching the service life of the Catalysts is affected. The legislature therefore has an annual review the function of motor vehicle catalytic converters provided. According to the invention this can Checks are not required if the device is used as an additional device for catalytic converters according to the type of tachograph for trucks, which is also required by law is sealed and the proper function of the catalytic converters by a suitable one The display can be checked at every police road traffic control.

Aus dem Gerät als Zusatzeinrichtung für Abgaskatalysatoren können ferner, ersatzweise für die üblichen Lambda-Sonden, elektrische Größen entnommen werden, die proportional dem Gehalt eines spezifischen Schadstoffes in den Abgasen sind und deshalb zur Steuerung oder Regelung von Motoraggregaten oder Motor-Hilfsaggregaten wie z.b. Ventilantrieben, Einspritzpumpen und Vergasern zwecks Senkung dieser Schadstoffanteile im Abgas herangezogen werden können.You can use the device as an additional device for catalytic converters furthermore, as a substitute for the usual lambda probes, electrical values are taken that is proportional to the content of a specific pollutant in the exhaust gases and are therefore used to control or regulate engine units or auxiliary engine units such as. Valve drives, injection pumps and carburetors to reduce these pollutants can be used in the exhaust gas.

Die Erfindung wird anhand der Abbildungen beispielsweise beschrieben. Im einzelnen zeigt Fig. 1 Emissionsspektrum einer monochromatischen Lichtquelle mit einem ausgeprägten Emissionsmaximum bei einer Wellenlänge von 400 nm Fig. 2 Absorptionsspektrum von N02 mit einem ausgeprägten Absorptionsmaximum bei 400 nm Fig. 3 Gerät entsprechend der Erfindung und dessen Anordnung im Abgasstrom Mit dem an sich bekannten absorptions-spektrometrischen Verfahren sind alle Schadstoffe in Abgasen qualitativ und quantitativ zu bestimmen, die einen ausgeprägten Extremwert in ihrem Absorptionsspektrum aufweisen. In der Beschreibung der Erfindung wird beispielsweise auf N02 Bezug genommen, das einen solchen Extremwert für eine Wellenlänge von ca.The invention is described, for example, with reference to the figures. In detail, Fig. 1 shows the emission spectrum of a monochromatic light source with a pronounced emission maximum at a wavelength of 400 nm Fig. 2 Absorption spectrum of NO2 with a pronounced absorption maximum at 400 nm Fig. 3 device according to the invention and its arrangement in the exhaust gas flow With the absorption-spectrometric method known per se are all pollutants to determine qualitatively and quantitatively in exhaust gases that have a pronounced extreme value have in their absorption spectrum. In the description of the invention, for example referred to N02, which has such an extreme value for a wavelength of approx.

400 nm aufweist.400 nm.

Das Gerät ist vorzugsweise in einem Winkel von 90t zur Richtung des Abgasstromes angeordnet. Die Absorptionsmeßstrecke befindet sich auf der Linie I-I (Fig. 3). Auf dieser Linie sind die Lichtquelle (5), der Meßsensor (6) sowie der Referenzsensor (7) angeordnet. Die Lichtquelle (5) emittiert annähernd monochromatisches Licht der Wellenlänge, für die das Absorptionsspektrum der nachzuweisenden Abgaskomponente ein Absorptionsmaximum aufweist (Fig.l und 2).The device is preferably at an angle of 90t to the direction of the Exhaust gas stream arranged. The absorption measuring section is on line I-I (Fig. 3). On this line are the light source (5), the measuring sensor (6) and the Reference sensor (7) arranged. The light source (5) emits almost monochromatic Light of the wavelength for which the absorption spectrum of the exhaust gas component to be detected has an absorption maximum (Fig.l and 2).

Der Abgasstrom wird zwischen der Lichtquelle und dem Meßsensor (6) hindurchgeführt. Entsprechend dem gewählten Beispiel wird sich bei steigendem N02 -Gehalt des Abgases eine diesem Anstieg proportionale Potentiald:ifferenz zwischen dem Meßsensor (6) und dem Referenzsensor (7) einstellen.The exhaust gas flow is between the light source and the measuring sensor (6) passed through. According to the example chosen, with increasing N02 -Content of the exhaust gas a potential proportional to this increase: ifference between the measuring sensor (6) and the reference sensor (7).

Die Lichtquelle (5) und die Sensoren (6) (7) sind mit einer bekannten elektronischen Schaltung verbunden. Da das gesamte Gerät je nach Betriebszustand des Motors und den klimatischen Verhältnissen erheblichen Temperaturschwankungen ausgesetzt ist, muß diese Schaltung neben einem Intensitätsregler (1) für die Lichtquellenansteuerung und einem Komparator (4) auch eine Temperaturkompensation (3) beinhalten, die über einen Temparatursensor (2), welcher vorzugsweise an der Abgasleitung (8) positioniert ist, angesteuert wird.The light source (5) and the sensors (6) (7) have a known one electronic circuit connected. As the entire device depending on the operating status of the engine and the climatic conditions are significant temperature fluctuations is exposed, this circuit must have an intensity regulator (1) for the light source control and a comparator (4) also include a temperature compensation (3), which over a temperature sensor (2), which is preferably positioned on the exhaust pipe (8) is controlled.

Das Auftreten von freiem Kohlenstoff hat bei früheren Versuchen, Sensoren aller Art im Einwirkungsbereich der Abgase zu installieren, zum Verrußen dieser Sensoren und damit zu unsicheren Meßergebnissen geführt. Um solche Ablagerungen zu vermeiden, ist das Abgasrohr erfindungsgemäß als Düse mit dem kleinsten Querschnitt im Bereich der Absorptionsmeßstrecke I - I ausgebildet. Lichtquelle (5) und Sensoren (6) (7) sind in Kanälen (9) (10) untergebracht,die im Bereich des kleinsten Düsenquerschnittes in die Abgasleitung münden- und an den jeweils offenen Enden mit Luftfiltern (11) versehen sein können. An den Positionen von- Lichtquelle (5) und Meßsensor (6) herrscht also gegenüber dem Abgasstrom Überdruck, so daß eine Ablagerung von Abgasbestandteilen auf diesen Elementen vermieden wird.The appearance of free carbon has in previous attempts at sensors of all kinds to be installed in the area affected by the exhaust gases, to soot them Sensors and thus led to uncertain measurement results. To such deposits According to the invention, the exhaust pipe is to be avoided as a nozzle with the smallest cross section formed in the area of the absorption measuring section I - I. Light source (5) and sensors (6) (7) are housed in channels (9) (10) in the area of the smallest nozzle cross-section open into the exhaust pipe and with air filters (11) at the open ends can be provided. At the positions of the light source (5) and measuring sensor (6) prevails thus overpressure in relation to the exhaust gas flow, so that a deposition of exhaust gas components on these elements is avoided.

Als Zusatzeinrichtung zu Katalysatoren ist das Gerät in seiner Zuverlässigkeit ohnehin durch Verrußen von Lichtquelle und Sensor nicht gefährdet. Der Katalysator hat bekanntlich die Aufgabe, die Oxidation von C bzw. CO in C02 , bei gleichzeitiger Reduktion vo.n N02 in N zu fördern. Ein Verrußen der Lichtquelle (5) und des Meßsensors (6) würde deshalb in gleicher Weise eine Funktionsstörung des Katalysators signalisieren wie das Ansteigen des N02 -Gehaltes im Abgas.As an add-on to catalytic converters, the device is extremely reliable anyway not endangered by soot on the light source and sensor. The catalyst is known to have the task of the oxidation of C or CO in C02, with simultaneous Promote reduction of N02 in N. Sooting of the light source (5) and the measuring sensor (6) would therefore signal a malfunction of the catalytic converter in the same way like the increase in the N02 content in the exhaust gas.

Durch das Ansaugen von Frischluft durch die Kanäle (9) u. (10) erfolgt ferner eine zusätzliche Kühlung der emittierten Abgase. Als Zusatzeinrichtung für Abgaskatalysatoren kann das Gerät in Richtung des Abgasstromes wahlweise vor oder hinter dem Katalysator angeordnet werden. Die Ansaugöffnungen der Kanäle (9) und (10) können mit Ventilen bzw.Drossel- klappen (12) versehen werden, die von einem Abgas-Temperatursensor (13) über eine Schaltung (14) angesteuerbar sind, wodurch der Frischluftzustrom in Abhängigkeit von der Abgastemperatur variert werden kann. Ordnet man das Gerät vor dem Katalysator an, ergibt sich der zusätzliche Vorteil, daß dadurch die Betriebstemperatur des Katalysators, unabhängig vom Betriebszustand des Motors, in einem optimalen Bereich zu halten ist.By sucking in fresh air through the channels (9) and (10) takes place also an additional cooling of the emitted exhaust gases. As an additional device for The device can have exhaust gas catalytic converters either in front of or in the direction of the exhaust gas flow be arranged behind the catalytic converter. The suction openings of the channels (9) and (10) can be fitted with valves or throttle flaps (12) are provided, which can be controlled by an exhaust gas temperature sensor (13) via a circuit (14) are, whereby the fresh air inflow varies depending on the exhaust gas temperature can be. If the device is arranged in front of the catalytic converter, the additional one results The advantage that this increases the operating temperature of the catalytic converter, regardless of the operating state of the engine is to be kept in an optimal range.

Claims (7)

PATENTANSPRUCHE 1. Gerät zur kontinuierlichen fotometrischen Messung von Schadstoff-Komponenten in Abgasen und/oder zur Beeinflussung der Abgastemperaturen, vorzugsweise für Abgase von Verbrennungskraftmaschinen, dadurch gekennzeichnet, daß Lichtquelle und Meßsensor in Bauräumen positioniert sind, in denen gegenüber dem zu messenden Abgasstrom ein über herrscht.PATENT CLAIMS 1. Device for continuous photometric measurement of pollutant components in exhaust gases and / or to influence the exhaust gas temperatures, preferably for exhaust gases from internal combustion engines, characterized in that that the light source and measuring sensor are positioned in installation spaces in which opposite the exhaust gas flow to be measured prevails. 2. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß das abgasführende Rohr partiell als Düse ausgebildet ist und daß in diese Düse im Bereich erhöhter Strömungsgeschwindigkeit der Abgase Kanäle münden, in welchen Lichtquelle und Meßsensor positioniert sind.2. Apparatus according to claim 1, characterized in that the exhaust gas leading Tube is partially designed as a nozzle and that increased in this nozzle in the area Flow velocity of the exhaust gases channels open into which light source and measuring sensor are positioned. 3. Gerät nach Anspruch 1 und 2, dadurch gekennzeichnet, daß vorzugsweise atmosphärische Luft, entsprechend dem Druckgefälle, an der Lichtquelle und dem Meßsensor vorbeistreicht und diese dadurch von Ablagerungen aus Abgaspartikeln freihält.3. Apparatus according to claim 1 and 2, characterized in that preferably atmospheric air, according to the pressure gradient, at the light source and the measuring sensor sweeps past and thus keeps it free of deposits from exhaust gas particles. 4. Gerät nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß unabhängig von Zahl und Art der Meßsensoren der Luftstrom in den Kanälen beispielsweise durch Ventile oder Drosselklappen so gesteuert bzw. geregelt wird, daß die Temperatur der Abgase durch Mischung mit diesem Luftstrom in gewünschten Grenzen gehalten wird.4. Apparatus according to claims 1 to 3, characterized in that the air flow in the ducts, for example, regardless of the number and type of measuring sensors is controlled or regulated by valves or throttle valves so that the temperature the exhaust gases are kept within desired limits by mixing with this air flow. 5. Gerät nach den Ansprüchen 1,3,4, dadurch gekennzeichnet, daß die Bauräume, in denen Lichtquelle und Meßsensor positioniert sind, durch einen ge- genüber dem Abgasstrom höheren Druck beaufschlagt werden.5. Apparatus according to claims 1,3,4, characterized in that the Installation spaces in which the light source and measuring sensor are positioned opposite higher pressure is applied to the exhaust gas flow. 6. Gerät nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß die fotometrischen Meßwerte in geeigneter Weise, vorzugsweise als Grenzwertanzeige, sichtbar gemacht werden und/oder zur Steuerung von Motoraggregaten oder Motorhilfsaggregaten zu dem Zweck herangezogen werden, durch Anderung des Motor-Betriebszustandes eine Absenkung bestimmter Schadstoffanteile im Abgas zu bewirken.6. Apparatus according to claims 1 to 5, characterized in that the photometric measured values in a suitable manner, preferably as a limit value display, can be made visible and / or for controlling engine units or engine auxiliary units can be used for the purpose of changing the engine operating state To bring about a reduction in certain pollutant levels in the exhaust gas. 7. Gerät nach Anspruch 6., eingesetzt als Zusatzeinrichtung an Abgaskatalysatoren, dadurch gekennzeichnet, daß deren einwandfreie Funktion kontinuierlich überprüft und durch schnelle Anderung des Motor-Betriebszustandes ein Schaden am Katalysator v.erhindert wird.7. Device according to claim 6, used as an additional device on catalytic converters, characterized in that their proper functioning is checked continuously and damage to the catalytic converter due to rapid changes in the engine operating state is prevented.
DE19853503720 1985-02-05 1985-02-05 Instrument for the continuous photometric determination of pollutant components in exhaust gases and/or for influencing exhaust-gas temperatures Withdrawn DE3503720A1 (en)

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DE19853503720 DE3503720A1 (en) 1985-02-05 1985-02-05 Instrument for the continuous photometric determination of pollutant components in exhaust gases and/or for influencing exhaust-gas temperatures

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DE3503720A1 true DE3503720A1 (en) 1986-08-07

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4129068A1 (en) * 1991-09-02 1993-03-04 Grundig Emv ARRANGEMENT FOR MEASURING EXHAUST GASES IN COMBUSTION ENGINES
EP0609461A4 (en) * 1992-08-24 1995-11-08 Tomoe Kogyo Kk Concentration measuring apparatus.
DE4443016A1 (en) * 1994-12-02 1996-06-05 Sick Optik Elektronik Erwin Spectral analyser of gas concentration
US6791689B1 (en) 1998-04-14 2004-09-14 Instrumentarium Corp. Sensor assembly and method for measuring nitrogen dioxide
DE102012215805B3 (en) * 2012-09-06 2013-09-26 Siemens Aktiengesellschaft Process interface for transmitted light-based in-situ process gas analyzer, has ring element arranged inside tubes and comprising inner side convex curved such that cross-section of ring element comprises profile with edge at window

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4129068A1 (en) * 1991-09-02 1993-03-04 Grundig Emv ARRANGEMENT FOR MEASURING EXHAUST GASES IN COMBUSTION ENGINES
DE4129068C2 (en) * 1991-09-02 1999-05-20 Grundig Ag Arrangement for measuring exhaust gases in internal combustion engines
EP0609461A4 (en) * 1992-08-24 1995-11-08 Tomoe Kogyo Kk Concentration measuring apparatus.
DE4443016A1 (en) * 1994-12-02 1996-06-05 Sick Optik Elektronik Erwin Spectral analyser of gas concentration
US5781306A (en) * 1994-12-02 1998-07-14 Erwin Sick Gmbh Optik-Elektronik Measuring apparatus for gas analysis
US6791689B1 (en) 1998-04-14 2004-09-14 Instrumentarium Corp. Sensor assembly and method for measuring nitrogen dioxide
DE102012215805B3 (en) * 2012-09-06 2013-09-26 Siemens Aktiengesellschaft Process interface for transmitted light-based in-situ process gas analyzer, has ring element arranged inside tubes and comprising inner side convex curved such that cross-section of ring element comprises profile with edge at window

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