DE422442C - Device for the determination of combustible components in gases with the help of an electrically heated, catalytically active metal wire wound into a helical spring - Google Patents

Device for the determination of combustible components in gases with the help of an electrically heated, catalytically active metal wire wound into a helical spring

Info

Publication number
DE422442C
DE422442C DES60782D DES0060782D DE422442C DE 422442 C DE422442 C DE 422442C DE S60782 D DES60782 D DE S60782D DE S0060782 D DES0060782 D DE S0060782D DE 422442 C DE422442 C DE 422442C
Authority
DE
Germany
Prior art keywords
helical spring
gases
determination
metal wire
catalytically active
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
Application number
DES60782D
Other languages
German (de)
Inventor
Dr-Ing Max Moeller
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.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
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 Siemens and Halske AG, Siemens AG filed Critical Siemens and Halske AG
Priority to DES60782D priority Critical patent/DE422442C/en
Application granted granted Critical
Publication of DE422442C publication Critical patent/DE422442C/en
Expired legal-status Critical Current

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)
  • Catalysts (AREA)

Description

Vorrichtung zur Bestimmung von brennbaren Bestandteilen in Gasen mit Hilfe eines zu einer Schraubenfeder gewickelten, elektrisch heizbaren, katalytisch wirkenden Metalldrahtes. Es ist bekannt, zur Bestimmung des Gehaltes an brennbaren Gasen das zu untersuchende Gasgemisch an einem zu einer Schraubenfeder gewickelten, katalytisch wirkenden Metalldraht vorbei:streichen zu lassen. Die Temperatur des Drahtes erhöht sich dann und damit sein elektrischer Widerstand. Dieser kann vermittels einer Wheatstönes,chen Brücke leicht gemessen werden. Um den Draht mit nicht zu großer elektrischer Energie heizen zu können., müßte sein Querschnitt so gering ,als möglich gewählt werden. Das hat aber den Nachteil, daß er bei der ziemlich hohen Temperatur, auf die er erhitzt wird, leicht reißt.Device for the determination of combustible components in gases with With the help of an electrically heated, catalytic converter wound into a helical spring acting metal wire. It is known to determine the content of combustible Gases the gas mixture to be examined on a coil spring wound, catalytically active metal wire over: to be painted. The temperature of the The wire then increases and with it its electrical resistance. This can mediate a Wheattones bridge can easily be measured. To get the wire with not too to be able to heat large electrical energy., its cross-section would have to be so small , be chosen as possible. But that has the disadvantage that it is quite tears easily at high temperature to which it is heated.

Die Erfindung beruht nun in der Erkenntnis, daß man unter Beibehaltung der gleichen Drahtstärke die Heizenergie wesentlich herabsetzen oder unter Beibehaltung der gleichen Heizenergie einen wesentlich stärkeren Draht verwenden kann, sofern nur dafür Sorge getragen wird, daß die Wärmeverluste der Schraubenfeder entsprechend herabgesetzt werden.The invention is based on the knowledge that while maintaining the same wire size significantly reduce or maintain the heating energy the same heating energy can use a much stronger wire, provided that care is only taken that the heat losses of the coil spring accordingly be reduced.

Gemäß der Erfindung wird daher der Draht zu einer Schraubenfeder gewickelt, deren innerer Durchmesser kleiner als 1/2 mm und deren Ganghöhe kleiner als o,35 mm ist. Eine solche Schraubenfeder strahlt, wie die Technik der Halbwattlampe gelehrt hat, eine weit geringere Wärm.eenergle aus, da sich die einzelnen Windungender Schraubenfeder gegenseitig heizen. Dadurch wird es also möglich - und darin liegt der Hauptvorteil der Erfindung -, den Durchmesser des Drahtes zu vergrößern, ohne die elektrische Energie erhöhen zu müssen. Die so erzielte Durchmesservergrößerung genügt, um dem Draht die Lebensdauer zu geben, die ihn erst praktisch verwertbar macht. Überdies ermöglicht eine Schraubenfeder aus stärkerem Draht, wie er gemäß der Erfindung verwendet wird, die Ausspannung in. der Meßkammer unter so großem Zuge, daß die Achsie der Schraubenfader auch bei Erwärmung des Drahtes geradlinig verbleibt.According to the invention, the wire is therefore wound into a helical spring, whose inner diameter is less than 1/2 mm and whose pitch is less than 0.35 mm is. Such a coil spring shines, as taught by the technology of the half-watt lamp has a far lower level of warmth, since the individual turns of the helical spring heat each other. So that's what makes it possible - and that's the main benefit of the invention - to increase the diameter of the wire without the electrical Having to increase energy. The increase in diameter achieved in this way is sufficient to the To give wire the service life that makes it usable in practice. Besides enables a coil spring made of stronger wire as used according to the invention is, the relaxation in. the measuring chamber with such a great pull that the axis of the Helical filament remains in a straight line even when the wire is heated.

Claims (1)

]PATENT-AN SPRUCH: Vorrichtung zur Bestimmung von brennbaren Bestandteilen in Gasen mit Hilfe eines zu einer Schraubenfeder gewickelten, elektrisch heizbaren, katalytisch wirkenden Metalldrahtes, an dem das zu untersuchende Gasgemisch vorbeigeführt wird, dadurch gekennzeichnet, daß der Inn:endur.chmessier dieser Schraubenfeder kleiner ist als i/2 mm und ihre Ganghöhe weniger als o,35 mm beträgt.] PATENT-AN SPRUCH: Device for the determination of combustible components in gases with the aid of an electrically heatable, catalytically active metal wire wound into a helical spring, on which the gas mixture to be examined is passed, characterized in that the inside: endur.chmessier of this helical spring is smaller than 1/2 mm and its pitch is less than 0.35 mm.
DES60782D 1922-09-05 1922-09-05 Device for the determination of combustible components in gases with the help of an electrically heated, catalytically active metal wire wound into a helical spring Expired DE422442C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DES60782D DE422442C (en) 1922-09-05 1922-09-05 Device for the determination of combustible components in gases with the help of an electrically heated, catalytically active metal wire wound into a helical spring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES60782D DE422442C (en) 1922-09-05 1922-09-05 Device for the determination of combustible components in gases with the help of an electrically heated, catalytically active metal wire wound into a helical spring

Publications (1)

Publication Number Publication Date
DE422442C true DE422442C (en) 1925-12-01

Family

ID=7494369

Family Applications (1)

Application Number Title Priority Date Filing Date
DES60782D Expired DE422442C (en) 1922-09-05 1922-09-05 Device for the determination of combustible components in gases with the help of an electrically heated, catalytically active metal wire wound into a helical spring

Country Status (1)

Country Link
DE (1) DE422442C (en)

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