DE2151693A1 - High concn carbon dioxide measurement - by partial absorption to reduce the concn before determination - Google Patents

High concn carbon dioxide measurement - by partial absorption to reduce the concn before determination

Info

Publication number
DE2151693A1
DE2151693A1 DE19712151693 DE2151693A DE2151693A1 DE 2151693 A1 DE2151693 A1 DE 2151693A1 DE 19712151693 DE19712151693 DE 19712151693 DE 2151693 A DE2151693 A DE 2151693A DE 2151693 A1 DE2151693 A1 DE 2151693A1
Authority
DE
Germany
Prior art keywords
concn
test tube
alkali
tube according
carrier
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.)
Pending
Application number
DE19712151693
Other languages
German (de)
Inventor
Auf Nichtnennung Antrag
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.)
Auergesellschaft GmbH
Original Assignee
Auergesellschaft GmbH
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 Auergesellschaft GmbH filed Critical Auergesellschaft GmbH
Priority to DE19712151693 priority Critical patent/DE2151693A1/en
Publication of DE2151693A1 publication Critical patent/DE2151693A1/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G01N33/0011—Sample conditioning
    • G01N33/0013—Sample conditioning by a chemical reaction
    • 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—Specially adapted to detect a particular component
    • G01N33/004—Specially adapted to detect a particular component for CO, CO2
    • 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

Abstract

concentrations 10% are measured in exhausts from internal combustion engines, particularly motor vehicles, by passing the gas stream initially through an absorbing layer consisting of an alkali-metal or alkaline-earth hydroxide, esp. KOH and/or Ba(OH)2, and an alkali-inert, fine-grained (0.1-0.2 mm) carrier esp. Al2O3 and/or calcium silicate. The ratio hydrate/carrier is 3/10 to 3/5 and the mixt. pref. contains 0.1-5% H2O. Part of the CO2 is absorbed and the remainder determined by an indicator of existing design. This cheap, simple absorption technique extends the range of existing CO2 indicating devices.

Description

Prüfröhrchen zur Messung von CO2 Die Erfindung bezieht sich auf ein Prüfröhrchen zur Messung von C02 in großen Konzentrationen, z.B. größer als 10 %. Detector tubes for measuring CO2 The invention relates to a Detector tube for measuring C02 in large concentrations, e.g. greater than 10%.

Es ist bereits allgemein bekannt, mittels einer Vorschicht einen Teil eines Gases, dessen Konzentration bestimmt werden soll, vor Eintritt in die Anzeigeschicht zu absorbieren, um auf diese Weise den Meßbereich zu größeren Konzentrationen hin zu verschieben (siehe Gebrauchsmuster 1 817 932). It is already well known to use a pre-coat Part of a gas whose concentration is to be determined before it enters the Display layer to absorb in order to increase the measuring range in this way to move towards (see utility model 1 817 932).

Der Erfindung liegt die Aufgabe zugrunde, das Prüfröhrchen der eingangs erwähnten Art nach dieser allgemeinen Lehre auszubilden.The invention is based on the object, the test tube of the opening mentioned type according to this general teaching.

Diese Aufgabe wird erfindungsgemäß gelöst durch eine in dem Prüfröhrchen vorgesehene Vorschicht, die einen Teil des C02 absorbiert und aus einem gegen starkes Alkali unempfindlichen porösen Träger, z.B. Aluminiumoxid und/oder Calciumsilikat und einem Alkali - und/oder Erdalkalihydroxid, z.B. KOH und/oder Ba(OH)2, besteht.According to the invention, this object is achieved by one in the test tube provided pre-layer, which absorbs part of the C02 and consists of a strong Alkali-insensitive porous carrier, e.g. aluminum oxide and / or calcium silicate and an alkali and / or alkaline earth hydroxide, e.g., KOH and / or Ba (OH) 2.

Mit einem Prüfröhrchen mit einer solchen Vorschicht können größere C02-Konzentrationen zur Anzeige gebraucht werden.With a test tube with such a pre-layer, larger C02 concentrations are needed for display.

Erfindungsgemäß soll das Prüfröhrchen bevorzugt zur Messung der C02-Konzentration in Autoabgasen verwendet werden.According to the invention, the test tube should preferably be used to measure the CO 2 concentration be used in car exhaust.

Erfindungsgemäß soll das Verhältnis Hydroxid zu Träger 3/10 bis 3/5 betragen. Die Menge an Alkali soll demnach groß sein, damit die Vorschicht eine große C02 Kapazität besitzt.According to the invention, the ratio of hydroxide to carrier should be 3/10 to 3/5 be. The amount of alkali should therefore be large, so that the pre-layer one has a large C02 capacity.

Ferner wird vorgeschlagen, daß die Vorschicht feucht ist, insbesondere 0,1 - 5 ffi H20, bezogen auf die Gesamtmasse, aufweist.It is also proposed that the preliminary layer be moist, in particular 0.1 - 5 ffi H20, based on the total mass.

Auf diese Weise wird erreicht, daß die Absorptionsreaktion besser abläuft.In this way it is achieved that the absorption reaction is better expires.

Beispiel: 100 g Al203 (0,1 - 0,2 mm) + 15 ml KOH-Lösung. (28g KOH + 72 ml H20).Example: 100 g Al203 (0.1-0.2 mm) + 15 ml KOH solution. (28g KOH + 72 ml H20).

Trocknung im Vakuum bei 1000 C. Nachfeuchtung mit 1 ml EpO.Drying in a vacuum at 1000 C. Re-moistening with 1 ml EpO.

Ein 20 mm langes Bett dieser Masse ist in der Lage, bei einem Prüfgasvolumen von 0,1 1 10 Vol C02 zu absorbieren.A 20 mm long bed of this mass is able to with a test gas volume to absorb 0.1 1 10 vol C02.

Claims (5)

P a t e n t a n s p r ü c h eP a t e n t a n s p r ü c h e 1. Prüfröhrchen zur Messung von C02 in großen Konzentrationen, z.B. größer als 10 %, g e k e n n z e i c h n e t durch eine Vorschicht, die einen Teil des C02 absorbiert und aus einem gegen starkes Alkali unempfindlichen porösen Träger, z.B. Aluminiumoxid und/oder Calciumsilikat und einem Alkali -und/oder Erdalkalihydroxid, z.B. KOH und/oder Ba(OH)2 besteht.1. Detector tubes for measuring C02 in large concentrations, e.g. greater than 10%, not indicated by a pre-shift which is a part of the C02 is absorbed and made of a porous carrier insensitive to strong alkali, e.g. aluminum oxide and / or calcium silicate and an alkali and / or alkaline earth hydroxide, e.g. KOH and / or Ba (OH) 2. 2. Prüfröhrchen nach Anspruch 1, dadurch g e k e n n -z e i c h n e t , daß der Träger feinkörnig ist, wobei insbesondere die Teilchengröße zwischen 0,1 und 0,2 mm liegt. 2. Test tube according to claim 1, characterized in that g e k e n n -z e i c h n e t that the carrier is fine-grained, in particular the particle size between 0.1 and 0.2 mm. 3. Prüfröhrchen nach Anspruch 1 oder 2, dadurch g e k e n n -z e i c h n e t , daß das Verhältnis Hydroxid zu Träger 3/10 bis 3/5 beträgt.3. test tube according to claim 1 or 2, characterized g e k e n n -z e i c h n e t that the ratio of hydroxide to support is 3/10 to 3/5. 4. Prüfröhrchen nach Anspruch 1 bis 3, dadurch g e k e n n -z e i c h n e t , daß die Vorschichtmasse feucht ist, insbesondere 0,1 - 5 ffi H20, bezogen auf die Gesamtmasse, aufweist.4. test tube according to claim 1 to 3, characterized g e k e n n -z e i c h n e t that the pre-layer compound is moist, in particular 0.1-5 ffi H20, based on the total mass. 5. Anwendung eines Prüfröhrchens gemäß einem oder mehreren der vorgenannten Ansprüche zur Messung der C02-Konzentration in Abgasen von Verbrennungsmotoren, insbesondere solchen von Kraftwagen.5. Use of a test tube according to one or more of the aforementioned Requirements for measuring the C02 concentration in exhaust gases from internal combustion engines, especially those of motor vehicles.
DE19712151693 1971-10-13 1971-10-13 High concn carbon dioxide measurement - by partial absorption to reduce the concn before determination Pending DE2151693A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19712151693 DE2151693A1 (en) 1971-10-13 1971-10-13 High concn carbon dioxide measurement - by partial absorption to reduce the concn before determination

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712151693 DE2151693A1 (en) 1971-10-13 1971-10-13 High concn carbon dioxide measurement - by partial absorption to reduce the concn before determination

Publications (1)

Publication Number Publication Date
DE2151693A1 true DE2151693A1 (en) 1973-04-19

Family

ID=5822590

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19712151693 Pending DE2151693A1 (en) 1971-10-13 1971-10-13 High concn carbon dioxide measurement - by partial absorption to reduce the concn before determination

Country Status (1)

Country Link
DE (1) DE2151693A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4345211C2 (en) * 1992-03-04 1996-08-08 Fujitsu Ltd Measuring equipment for simplified measurement of the ambient atmosphere
DE4390935C2 (en) * 1992-03-04 1996-08-29 Fujitsu Ltd Measuring ambient atmos. simply
US5750406A (en) * 1993-11-04 1998-05-12 Fujitsu Limited Environment monitoring test piece and test method
US5985213A (en) * 1992-03-04 1999-11-16 Fujitsu Limited Simplified environmental atmosphere measuring apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4345211C2 (en) * 1992-03-04 1996-08-08 Fujitsu Ltd Measuring equipment for simplified measurement of the ambient atmosphere
DE4390935C2 (en) * 1992-03-04 1996-08-29 Fujitsu Ltd Measuring ambient atmos. simply
US5985213A (en) * 1992-03-04 1999-11-16 Fujitsu Limited Simplified environmental atmosphere measuring apparatus
US5994144A (en) * 1992-03-04 1999-11-30 Fujitsu Limited Simplified environmental atmosphere measuring method
US5750406A (en) * 1993-11-04 1998-05-12 Fujitsu Limited Environment monitoring test piece and test method

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