DE2426773B2 - GAS POLLUTION ELEMENT FOR GAS MEASURING AND GAS ANALYSIS DEVICES - Google Patents
GAS POLLUTION ELEMENT FOR GAS MEASURING AND GAS ANALYSIS DEVICESInfo
- Publication number
- DE2426773B2 DE2426773B2 DE19742426773 DE2426773A DE2426773B2 DE 2426773 B2 DE2426773 B2 DE 2426773B2 DE 19742426773 DE19742426773 DE 19742426773 DE 2426773 A DE2426773 A DE 2426773A DE 2426773 B2 DE2426773 B2 DE 2426773B2
- Authority
- DE
- Germany
- Prior art keywords
- gas
- analysis devices
- measuring
- detection element
- oxide
- 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.)
- Granted
Links
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
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
- G01N27/16—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by burning or catalytic oxidation of surrounding material to be tested, e.g. of gas
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Description
Die Erfindung bezieht sich auf ein Gasspürelement für Gasmeß- und Gasanalysegeräte, bestehend aus einer Wendel aus Platin oder Platinlegierung mit einem die Wendel unmittelbar umgebenden Metall-Oxid-Körper und einem in diesem eingelagerten Katalysator.The invention relates to a gas detection element for gas measurement and gas analysis devices, consisting of a Coil made of platinum or platinum alloy with a metal oxide body immediately surrounding the coil and a catalyst stored in this.
Bei einem bekannten Gasspürelement dieser Art (siehe DAS 11 50 227) besteht das Stützgerüst ausschließlich aus Aluminium-Oxid. Dieses ist bei den hier auftretenden Temperaturen (800 bis 1000° C) nicht stabil; es neigt vielmehr dazu, aus seiner «-Struktur in seine y-Struktur überzugehen. Dabei ändert es seine Oberflächenstruktur, was im vorliegenden Fall zur Folge hat, daß sich die Empfindlichkeit des Gasspürelementes allmählich vermindert.In the case of a known gas detection element of this type (see DAS 11 50 227), the support structure consists exclusively made of aluminum oxide. This is not the case with the temperatures occurring here (800 to 1000 ° C) stable; rather, it tends to pass from its «structure to its y structure. In doing so, it changes his Surface structure, which in the present case has the consequence that the sensitivity of the gas detection element gradually diminished.
Der Erfindung liegt die Aufgabe zugrunde, das eingangs erwähnte Gasspürelement derart auszubilden, daß es eine längere Lebensdauer hat als das bekannte.The invention is based on the object of designing the gas detection element mentioned at the outset in such a way that that it has a longer lifespan than the known.
Diese Aufgabt wird erfindungsgemäß dadurch gelöst, daß der Körper aus überwiegend Thonum-Oxid und aus Aluminium-Oxid besteht.According to the invention, this object is achieved in that the body consists predominantly of thonum oxide and from Consists of aluminum oxide.
Thorium-Oxid ist bei den hier auftretenden Temperaturen wesentlich stabiler als Aluminium-Oxid und behält insofern seine Oberflächenstruktur bei: das erfindungsgemäße Gasspürelement hat infolgedessen eine längere Lebensdauer als das bekannte. Der geringe Zusatz an Aluminium-Oxid dient dazu, die Ausdehnungseigenschaften des Körpers den Ausdehnungseigenschaften der Wendel bei Temperaturvariationen anzupassen.At the temperatures occurring here, thorium oxide is much more stable than aluminum oxide and retains it insofar as its surface structure: the gas detection element according to the invention consequently has a longer one Lifespan than the known. The small addition of aluminum oxide serves to improve the expansion properties of the body to adapt the expansion properties of the helix in the event of temperature variations.
Das Fehlen der Umwandlung der Struktur des Thorium-Oxids bei den hier auftretenden Temperaturen hat einen weiteren Vorteil: Der Körper braucht nicht so voluminös wie derjenige zu sein, der ausschließlich aus Aluminium-Oxid besteht (ein großes Volumen hat eine große Oberfläche; je größer die Oberfläche, um soThe lack of transformation of the structure of the thorium oxide at the temperatures occurring here has another advantage: the body does not need to be as voluminous as the one that is exclusively made of Aluminum oxide is made up of (a large volume has a large surface area; the larger the surface area, the greater the surface area
ίο länger dauert es bei einem Aluminium-Oxid-Körper, bis das Element nicht mehr brauchbar ist). Ein kleines Volumen des Körpers wiederum hat einen geringeren Leistungsaufwand zur Folge. Das erfindungsgemäße Element kann also so ausgelegt sein, daß es wenigerίο It takes longer with an aluminum oxide body the element is no longer usable). A small volume of the body, in turn, has a smaller one Performance expenditure result. The element according to the invention can thus be designed so that there is less
Energie benötigt und damit eigensicher ist, im Gegensatz zu dem bekannten. Letzteres bedeutet, daß Teile in explosionsgefährdeten Räumen ausgewechselt werden können.Energy is required and is therefore intrinsically safe, in contrast to the known. The latter means that Parts can be exchanged in potentially explosive areas.
Es sei erwähnt, daß es auch schon bekannt ist (siehe GB-PS 1184184, Fig. 2), um einen die Wendel unmittelbar umgebenden Körper aus Aluminium-Oxid, in dem Glas eingelagert ist eine den Katalysator enthaltende Thorium-Oxid-Schicht zu legen. Abgesehen davon, daß hierbei nicht wie beim Erfindungsgegenstand der die Wendel unmittelbar umgebende Körper das Thorium-Oxid enthält, hat dieser Gegenstand den Nachteil gegenüber dem Erfindungsgegenstand, daß sein Körper der zwei Schichten wegen auf jeden Fall voluminöser ist als derjenige des Erfindungsgegenstandes, der nur aus einer Schicht besteht. Das wiederum schlägt sich in einem höheren Leistungsaufwand nieder. Ein höherer Leistungsaufwand ist bei diesem bekannten Gegenstand ferner auch deshalb zu erwarten, weil das zugesetzte Glas ein schlechter Wärmeleiter ist.It should be mentioned that it is already known (see GB-PS 1184184, Fig. 2) to one the helix directly surrounding body made of aluminum oxide, in which glass is embedded the catalyst containing thorium oxide layer. Apart from the fact that this is not the case with the subject matter of the invention the body immediately surrounding the coil contains the thorium oxide, this object has the Disadvantage compared to the subject matter of the invention that its body in any case because of the two layers is more voluminous than that of the subject invention, which consists of only one layer. That in turn is reflected in a higher performance expenditure. A higher power expenditure is known with this one The object is also to be expected because the added glass is a poor conductor of heat.
Zwec'smäßigerweise liegt der Anteil des Thorium-Oxids in Uen Grenzen zwischen 80 und 95%.The proportion of thorium oxide is expediently within limits between 80 and 95%.
In der Zeichnung sind zwei Ausführungsbeispiele schematisch dargestellt. Darin zeigen
F i g. 1 eine erste Ausführungsform,Two exemplary embodiments are shown schematically in the drawing. Show in it
F i g. 1 a first embodiment,
F i g. 2 eine zweite Ausführungsform undF i g. 2 a second embodiment and
F i g. 3 einen Schnitt durch die Ausführungsform der F ig. 2.F i g. 3 shows a section through the embodiment of FIG Fig. 2.
Das Element 1 besteht aus einer Drahtwendel 2, die mit einem Thorium-Oxid-Überzug 3 ummantelt ist, in den ein Katalysator 4 eingebettet ist.The element 1 consists of a wire coil 2, which is coated with a thorium oxide coating 3, in a catalyst 4 is embedded.
Hierzu 1 Blatt Zeichnungen1 sheet of drawings
Claims (3)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19742426773 DE2426773B2 (en) | 1974-05-31 | 1974-05-31 | GAS POLLUTION ELEMENT FOR GAS MEASURING AND GAS ANALYSIS DEVICES |
GB2385675A GB1512708A (en) | 1974-05-31 | 1975-06-02 | Methods of producing gas detectors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19742426773 DE2426773B2 (en) | 1974-05-31 | 1974-05-31 | GAS POLLUTION ELEMENT FOR GAS MEASURING AND GAS ANALYSIS DEVICES |
Publications (2)
Publication Number | Publication Date |
---|---|
DE2426773A1 DE2426773A1 (en) | 1975-12-11 |
DE2426773B2 true DE2426773B2 (en) | 1977-02-03 |
Family
ID=5917189
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19742426773 Granted DE2426773B2 (en) | 1974-05-31 | 1974-05-31 | GAS POLLUTION ELEMENT FOR GAS MEASURING AND GAS ANALYSIS DEVICES |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE2426773B2 (en) |
GB (1) | GB1512708A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2489961A1 (en) * | 1980-09-05 | 1982-03-12 | Nat Res Dev | ELEMENT ASSOCIATING A CATALYTIC MATERIAL AND AN ELECTRIC RESISTANCE FOR THE DETECTION OF COMBUSTIBLE GASES |
-
1974
- 1974-05-31 DE DE19742426773 patent/DE2426773B2/en active Granted
-
1975
- 1975-06-02 GB GB2385675A patent/GB1512708A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2489961A1 (en) * | 1980-09-05 | 1982-03-12 | Nat Res Dev | ELEMENT ASSOCIATING A CATALYTIC MATERIAL AND AN ELECTRIC RESISTANCE FOR THE DETECTION OF COMBUSTIBLE GASES |
Also Published As
Publication number | Publication date |
---|---|
DE2426773A1 (en) | 1975-12-11 |
GB1512708A (en) | 1978-06-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C3 | Grant after two publication steps (3rd publication) | ||
E77 | Valid patent as to the heymanns-index 1977 |