DE2462331B2 - Gas detection element for intrinsically safe - Google Patents

Gas detection element for intrinsically safe

Info

Publication number
DE2462331B2
DE2462331B2 DE19742462331 DE2462331A DE2462331B2 DE 2462331 B2 DE2462331 B2 DE 2462331B2 DE 19742462331 DE19742462331 DE 19742462331 DE 2462331 A DE2462331 A DE 2462331A DE 2462331 B2 DE2462331 B2 DE 2462331B2
Authority
DE
Germany
Prior art keywords
gas detection
detection element
metal oxide
intrinsically safe
helix
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
Application number
DE19742462331
Other languages
German (de)
Other versions
DE2462331C3 (en
DE2462331A1 (en
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 DE19742462331 priority Critical patent/DE2462331C3/en
Publication of DE2462331A1 publication Critical patent/DE2462331A1/en
Publication of DE2462331B2 publication Critical patent/DE2462331B2/en
Application granted granted Critical
Publication of DE2462331C3 publication Critical patent/DE2462331C3/en
Expired legal-status Critical Current

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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

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  • 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)

Description

Die Erfindung bezieht sich auf ein Gasspüreiement nach dein Oberbegriff des Anspruchs I.The invention relates to a gas detection element according to the preamble of claim I.

Ein bekanntes Gasspürelement dieser Art (Glückauf, Hand 104 (1968), S 127-135) dient /um Messen von Methan. Gegenüber Methan ist es insofern eigensicher als die /.ündenergie von Methan oberhalb der Energie etwaiger Zündfunken liegt.A well-known gas detection element of this type (Glückauf, Hand 104 (1968), S 127-135) is used to measure Methane. In relation to methane it is intrinsically safe as the ignition energy of methane is above the energy there is any ignition spark.

Hei einem weiteren Gasspürelenient (s. GB-PS 184) liegt der Drahtdurchinesser bei 25,4 μιη. Diese Stärke ist ebenfalls noch zu groß, um eine Eigensicherheit des Stromkreises ohne Einkapselung desselben für beliebige Gase zu gewährleisten. Der Metalloxidkörper besteht aus Aluminiumoxid, in das Glas eingelagert ist.In another gas tracer (see GB-PS 184), the wire diameter is 25.4 μm. This strength is also still too great for an intrinsic safety of the circuit without encapsulation to ensure the same for any gases. The metal oxide body consists of aluminum oxide into which Glass is stored.

Schließlich ist auch noch ein Gasspürelement bekannt ■ (SViRE Digest. Gas Detection Il (H72)), bei dem der Durchmesser des Drahtes 50 μιη ist und der Metalloxidkörper aus Thoriumoxid besteht. A.uch ein Siromkreis mit diesem Element ist ohne Einkapselung für beliebige Gase nicht eigensicher.Finally, a gas detection element is also known ■ (SViRE Digest. Gas Detection II (H72)), in which the The diameter of the wire is 50 μm and the metal oxide body consists of thorium oxide. A. Also a Sirom circle with this element is without encapsulation for any Gases not intrinsically safe.

Der Erfindung liegt die Aufgabe zugrunde, ein Gasmeßgerät mit einem Gasspürelement de-art auszubilden, daß das Gerät für beliebigeGase eigensicher ist.The invention is based on the object of designing a gas measuring device with a de-art gas detection element, that the device is intrinsically safe for any gases.

Diese Aufgabe wird erfindungsgemäß gelöst wie im Kennzeichen des Anspruches 1 angegeben.This object is achieved according to the invention as indicated in the characterizing part of claim 1.

Auf diese Weise wird erreicht, daß die Ströme im Stromkreis kleiner als 100 mA sind. Die Energie etwa auftretender Funken ist insofern kleiner als die Zündenergie vorkommender Gase. Das Gerät ist somit auch ohne Einkapselung der stromführenden Teile eigensichcr. Die Zusammensetzung des Metalloxidkörpers trägt der Tatsache Rechnung, daß der extrem dünne Wendeldraht -in besonderer Weise gestützt werden muß: Thoriumoxid ist siaMer als das bisher verwendete Aluminiumoxid und deidaalb besser jil»> dieses für die Stützung des Doihaes geeignet. Der Zusatz von Aluminiumoxid ist andererseils .erforderlich, um die Ansdehnungseigcnschafien des Körpers den Ausdehnungseigenschaften des Drahtes anzupassen.In this way it is achieved that the currents in the circuit are less than 100 mA. The energy, for example the spark that occurs is smaller than the ignition energy of the gases that occur. The device is thus intrinsically safe even without encapsulation of the live parts. The composition of the metal oxide body takes into account the fact that the extremely thin helical wire is supported in a special way must be: Thorium oxide is safer than it has been up to now used alumina and deidaalb better jil »> this suitable for supporting the Doihaes. Of the The addition of aluminum oxide is required on the other hand, about the stretching properties of the body Adjust the expansion properties of the wire.

Zur Herstellung des Mctalloxidkörpers werden einer Thoriumnitratlösung 5 — 20% einer Lösung einer Aluminium-Verbindung zugesetzt. In diese werden die Wendeln in üblicher Weise eingetaucht und aufgeheizt.To produce the metal oxide body, a Thorium nitrate solution 5 - 20% of a solution of an aluminum compound added. The Coils immersed and heated in the usual way.

Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.Further developments of the invention are the subject of the subclaims.

In der Zeichnung sind zwei Ausführungsbcispiclc schematisch dargestellt. Darin zeigtIn the drawing there are two embodiments shown schematically. In it shows

F i g. 1 eine erste Ausführungsform,F i g. 1 a first embodiment,

F i g. 2 eine zweite Ausführungsform undF i g. 2 a second embodiment and

Fig. 3 einen Schnitt durch die Ausführungsfonn der Fig. 2.Fig. 3 is a section through the Ausführungsfonn Fig. 2.

Das Element 1 besteht aus einer Drahtwendel 2, die mit einem Überzug 3 ummantelt ist, in den ein Katalysator 4 eingebettet ist.The element 1 consists of a wire coil 2, which is covered with a coating 3, in the one Catalyst 4 is embedded.

1st der Metalloxidkörper hohl, wie im Falle der F i g. 2 und 3, ist ein besonders geringer Energieaufwand zur Heizung des Elementes erforderlich.If the metal oxide body is hollow, as in the case of FIG. 2 and 3, is a particularly low energy expenditure for Heating of the element required.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims (5)

Patentansprüche:Patent claims: 1. Gasspürelement für eigensichere Gasmeßgeräte mit1. Gas detection element for intrinsically safe gas measuring devices with a) einer heizbaren Wendel aus Platin oder einer Plalinlegierungunda) a heatable coil made of platinum or a platinum alloy and b) einem 'Metalloxidkörper, in den die Wendel eingebettet ist,b) a 'metal oxide body in which the helix is embedded, dadurch gekennzeichnet, daßcharacterized in that c) der Drahtdurchmesser der Wendel (2) zwischen 30 und 25 μιη liegt undc) the wire diameter of the helix (2) is between 30 and 25 μm and d) der Metalloxidkörper (3) zum überwiegenden Teil aus Thoriumoxid und zum verbleibenden Teil aus Aluminiumoxid besteht.d) the metal oxide body (3) predominantly made of thorium oxide and the remaining part Part is made of aluminum oxide. 2. Gasspürelement nach Anspruch 1, dadurch gekennzeichnet, daß der Metalloxidkörper (3) aus 80 bis 95% Thoriumoxid besteht. 2. Gas detection element according to claim 1, characterized in that the metal oxide body (3) consists of 80 to 95% thorium oxide. 3. Gasspürelement nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Metalloxidkörper (3) hohl ist.3. Gas detection element according to claim 1 or 2, characterized in that the metal oxide body (3) is hollow. 4. Gasspürelemenl nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Wendel (2) 10 bis 30 Windungen aufweisL4. Gasspürelemenl according to one of claims 1 to 3, characterized in that the helix (2) has 10 to 30 turns 5. Gasspürelement nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dall der Abstand der Windungen das I- bis Jfachc des Durchmessers des Drahtes der Wendel (2) ist.5. Gas detection element according to one of claims 1 to 4, characterized in that the distance between the Turns is the I- to Jfachc of the diameter of the wire of the coil (2). b. Gasspürelement nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der innere Durchmesser der Wendel 0,3 bis 0,5 mm beträgt.b. Gas detection element according to one of Claims 1 to 5, characterized in that the inner The diameter of the helix is 0.3 to 0.5 mm.
DE19742462331 1974-05-31 1974-05-31 Gas detection element for intrinsically safe gas measuring devices Expired DE2462331C3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19742462331 DE2462331C3 (en) 1974-05-31 1974-05-31 Gas detection element for intrinsically safe gas measuring devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742462331 DE2462331C3 (en) 1974-05-31 1974-05-31 Gas detection element for intrinsically safe gas measuring devices

Publications (3)

Publication Number Publication Date
DE2462331A1 DE2462331A1 (en) 1977-02-24
DE2462331B2 true DE2462331B2 (en) 1980-05-08
DE2462331C3 DE2462331C3 (en) 1981-01-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19742462331 Expired DE2462331C3 (en) 1974-05-31 1974-05-31 Gas detection element for intrinsically safe gas measuring devices

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DE (1) DE2462331C3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3906599A1 (en) * 1989-03-02 1990-09-06 Draegerwerk Ag Compensation element for a measuring device for combustible gases

Also Published As

Publication number Publication date
DE2462331C3 (en) 1981-01-29
DE2462331A1 (en) 1977-02-24

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C3 Grant after two publication steps (3rd publication)