DE403764C - Firedamp indicator - Google Patents
Firedamp indicatorInfo
- Publication number
- DE403764C DE403764C DEG59694D DEG0059694D DE403764C DE 403764 C DE403764 C DE 403764C DE G59694 D DEG59694 D DE G59694D DE G0059694 D DEG0059694 D DE G0059694D DE 403764 C DE403764 C DE 403764C
- Authority
- DE
- Germany
- Prior art keywords
- firedamp
- gas mixture
- methane content
- burn
- indicator
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/10—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
- G01N7/12—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference the diffusion being followed by combustion or catalytic oxidation
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (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)
Description
Schlagwetteranzeiger. Bei dem Schlagwetteranzeiger des Hauptpatentes 400716 hat sich gezeigt, daß der in dem durch wenig poröse Steine abgedeckten Raume für nur eine ganz bestimmte Gasmenge zur Verbrennung der Grubengase auf Weißglut gehaltene dünne Draht aus Platin, Palladium u. dgl. mit den Verbrennungsprodukten gern Kohlenstoffverbindungen eingeht und dadurch leicht brüchig wird.Firedamp indicator. With the firedamp indicator of the main patent 400716 has been shown that the space covered by less porous stones for only a very specific amount of gas to burn the mine gases on incandescent embers held thin wire of platinum, palladium and the like with the combustion products likes to enter into carbon compounds and thus becomes easily brittle.
Die Anwendung eines dickeren Drahtes, um diesem Übelstande zu begegnen, verbietet sich aber wegen der dazu nötigen größeren Akkumulatorenbatterie, die dem Apparat die Handlichkeit nehmen würde.The use of a thicker wire to counteract this malady but because of the larger accumulator battery required for this, it is not possible to use the Apparatus that would take away from handiness.
Gemäß der vorliegenden Erfindung werden nun zur Beseitigung dieses Übelstandes zwei Wege vorgeschlagen.According to the present invention are now to eliminate this Two ways are suggested.
Der eine Weg geht dahin, den Draht mit einer dünnen Schicht von Ceroxyd zu überziehen, welche die Verbrennung der Grubengase an dem glühenden Draht nicht behindert, die Aufnahme von Kohlenstoff aber verhütet.One way is there, the wire with a thin layer of ceria to coat which the combustion of the mine gases on the glowing wire does not hinders, but prevents the uptake of carbon.
Statt Ceroxyd kann auch ein anderes Oxyd benutzt werden, sofern es nur die gewünschten Eigenschaften hat und seinerseits beim Erkalten den Draht nicht zerreißt, weil sein Ausdehnungskoeffizient bei erhöhter Temperatur gar zu sehr von dem des Platins oder des Palladiums abweicht. Als solche Oxyde erscheinen z. B. auch Thoroxyd und, wenn auch weniger gut, Kalziumoxyd oder auch andere Mischungen dieserOxyde mit Ceroxyd geeignet.Instead of cerium oxide, another oxide can be used, provided that it is only has the desired properties and, for its part, not the wire when it cools down tears because its coefficient of expansion is too much at elevated temperature differs from that of platinum or palladium. Such oxides appear, for. B. also thoroxide and, if less well, calcium oxide, or other mixtures this oxides with cerium oxide are suitable.
Der zweite Weg geht dahin, den Draht nur so weit vorzuwärmen, daß an ihm eine Entzündung des Gasgemisches noch nicht erfolgen kann. Versuche nach dieser Richtung haben nämlich ergeben, daß bereits bei einem bis zur hellen Rotglut erhitzten Draht eine vollkommen hinreichende Verbrennung schon -bei kleinstem Methangehalt des Gasgemisches stattfindet, dagegen aber selbst bei einem Methangehalt von 5 bis io Prozent keine Entflammung oder Explosion des Gasgemisches eintritt und infolgedessen auch kein schädlicher Überdruck in der Verbrennungskammer erzeugt wird.The second way is to preheat the wire just enough that ignition of the gas mixture cannot yet take place on it. Try after this direction have shown that already with one to bright red heat heated wire a completely sufficient combustion even with the smallest methane content of the gas mixture takes place, but even with a methane content of 5 to 10 percent no ignition or explosion of the gas mixture occurs and as a result also no harmful overpressure is generated in the combustion chamber.
Hieraus folgt, daß selbst ein nicht durch Ceroxyd o. dgl. geschützter Draht nicht so leicht zerreißt, als wenn er bis auf die Entzündungstemperatur der schlagenden Wetter vorgewärmt wäre.From this it follows that even one that is not protected by cerium oxide or the like Wire does not tear as easily as when it is down to the ignition temperature beating weather would be preheated.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEG59694D DE403764C (en) | 1923-08-11 | 1923-08-11 | Firedamp indicator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEG59694D DE403764C (en) | 1923-08-11 | 1923-08-11 | Firedamp indicator |
Publications (1)
Publication Number | Publication Date |
---|---|
DE403764C true DE403764C (en) | 1924-10-02 |
Family
ID=7132244
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEG59694D Expired DE403764C (en) | 1923-08-11 | 1923-08-11 | Firedamp indicator |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE403764C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6623152B1 (en) | 1999-12-08 | 2003-09-23 | Mentor Gmbh & Company | Display element capable of being mounted on a printed circuit board |
-
1923
- 1923-08-11 DE DEG59694D patent/DE403764C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6623152B1 (en) | 1999-12-08 | 2003-09-23 | Mentor Gmbh & Company | Display element capable of being mounted on a printed circuit board |
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