DE2554019A1 - Highly sensitive moisture detector - comprises double salt melt-applied between electrodes - Google Patents

Highly sensitive moisture detector - comprises double salt melt-applied between electrodes

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Publication number
DE2554019A1
DE2554019A1 DE19752554019 DE2554019A DE2554019A1 DE 2554019 A1 DE2554019 A1 DE 2554019A1 DE 19752554019 DE19752554019 DE 19752554019 DE 2554019 A DE2554019 A DE 2554019A DE 2554019 A1 DE2554019 A1 DE 2554019A1
Authority
DE
Germany
Prior art keywords
electrodes
double salt
highly sensitive
detector
moisture detector
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
DE19752554019
Other languages
German (de)
Other versions
DE2554019C3 (en
DE2554019B2 (en
Inventor
Alvaro Prof Dr Affonso
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.)
Hoelzle & Chelius 6078 Neu Isenburg De GmbH
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Individual
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 Individual filed Critical Individual
Priority to DE19752554019 priority Critical patent/DE2554019C3/en
Publication of DE2554019A1 publication Critical patent/DE2554019A1/en
Publication of DE2554019B2 publication Critical patent/DE2554019B2/en
Application granted granted Critical
Publication of DE2554019C3 publication Critical patent/DE2554019C3/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
    • G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
    • G01N27/121—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid for determining moisture content, e.g. humidity, of the fluid

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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 Fluid Adsorption Or Reactions (AREA)

Abstract

A highly sensitive moisture detector is claimed. The detector comprises a double salt (I) which is melt-applied between two electrodes. (I), which is alum or a cpd. isomorphous with KAl(SO4)2. 12H2O, may contain traces of a metal (e.g. Fe, Cu, Ni or Cr) to increase the detector's sensitivity and/or an aliph./ aromatic polyol to reduce the detector's electrical resistance. The detectors can be used for all the purposes for which those contg. LiCl have been hitherto used. Because of their increased sensitivity, they may also be used to measure the moisture on human skin, in ears etc.

Description

VERFAHREN ZUR HERSTELLUNG VON FEUCHTEFÜHLENPROCESS FOR PRODUCING MOISTURE FEELING

Vorliegendes Verfahren betrifft den Gebrauch von Klauren oder Mischungen von Alaunen mit Polyalkoholen, wobei die Substanzen ihre elektrische Leitfahigkeit ändern, durch Veränderung der Feuchte der sie ausgesetzt sind.The present method concerns the use of Klauren or mixtures of alums with polyalcohols, the substances being their electrical conductivity change by changing the humidity to which they are exposed.

Feuchtefühler auf der Basis von Lithiumchlorid sind bekannt und seit langem in Gebrauch. Sie finden Verwendung in Feuchtigkeitsreglern, Klimaanlagen usw. Solche Fühler haben einen niedrigen elektrischen Widerstand, brauchen Wechselstromanschluss und haben eine Temperaturbegrenzung während der Verwendung.Humidity sensors based on lithium chloride are known and have been since in use for a long time. They are used in humidity regulators, air conditioning systems etc. Such sensors have a low electrical resistance and need an AC connection and have a temperature limit during use.

Vorliegendes Verfahren ermöglicht die Herstellung von Feuchtefühlern mit relativ höherem elektrischen Widerstand sowie Verwendung von Gleichstromanschluss. Die Substanzen in Feuchtefühlern -hergestellt nach vorliegendem Verfahren- sind nicht zerfliessend. Außerdem sind sie beständiger gegenüber höheren Temperaturen. Die Erfindung ermöglicht die Herstellung von Feuchtefühlern durch ein enfaches Prinzip, d.h. durch Giessen der durch Hitze geschmolzenen Substanz zwischen zwei Elektroden von Gold oder Platin. Der so konstruierte Feuchtefühler kann grössenmässig beliebig verändert werden und zwar, bis auf weniger als einen Millimeter. Solch ein Mikrofeuchtefühler kann auf kleinstem Raum benutzt werden, um die relative oder absolute Feuchte zu messen. Feuchtefühler, hergestellt nach vorliegender Erfindung, können in fast allen Anwendungsgebieten zum Gebrauch kommen wo im Moment Lithiumchlorid in Anspruch genommen wird.The present process enables the production of humidity sensors with relatively higher electrical resistance and use of direct current connection. The substances in humidity sensors - manufactured according to the present process - are not dissolving. They are also more resistant to higher temperatures. The invention enables the production of humidity sensors by a simple principle, i.e. by pouring the heat-melted substance between two electrodes of gold or platinum. The humidity sensor constructed in this way can be of any size can be changed to less than a millimeter. Such a micro humidity sensor can be used in the smallest of spaces to measure relative or absolute humidity measure up. Humidity sensors, manufactured according to the present invention, can be used in almost all Areas of application come to use where at the moment lithium chloride is used will.

Außerdem, auf Grund ihrer hohen Empfindlichkeit und ihres Maßstabs, können sie in neuer Geruten, wie z.B. zum Messen der Feuchtigkeit auf der menschlichen Haut sowie in der Ohren usw., benutzt werden.In addition, due to their high sensitivity and scale, they can be used in new geruten, such as to measure the moisture on the human Skin as well as ears etc.

Die Klanne, welche diese Werte angeben, sind bekannte Alaune wie z.B. K Al(SO4)2 12 H2O, NH4 Al(SO4)2 12 H2O oder jedes Doppelsalz isomorph mit K Al(SO4)2 12 H2O. Die Polyalkohole, welche in Frage kommen, sind Polyalkohole die sich mit geschmolzenen Alaunen mischen, z.B. Glycerol, Polyethylenglykol usw. Die Erfindung wird durch folgende Beispiele erläutert: BEISPIEL 1 Reines Alaun K Al(SO4)2 12 H2O in feingepulverter Form, wird in einem Reagenzglas langsam erhitzt bis es schmilzt und eine klare Flüssigkeit ergibt. Zwei Platin- oder Goldeleketroden, Abstand ca. 1mm, werden in das flüssige Alaun eingetaucht und herausgehoben, so daß eine bestimmte Menge der Flüssigkeit zwischen der Elektroden bleibt. Nach einigen Stunden -bei Zimmertemperatur- kann der Feuchtefühler benutzt werden. Der elektrische Widerstand eines solchen Fühlers beträgt bei 50% relativer Feuchte (Kontaktoberfläche 1 x 1 x 1 mm) 5 megohm.The clusters which indicate these values are known alums such as e.g. K Al (SO4) 2 12 H2O, NH4 Al (SO4) 2 12 H2O or any double salt isomorphic with K Al (SO4) 2 12 H2O. The polyalcohols that come into question are polyalcohols that deal with mix molten alums, e.g., glycerol, polyethylene glycol, etc. The invention is illustrated by the following examples: EXAMPLE 1 Pure alum K Al (SO4) 2 12 H2O in finely powdered form, is slowly heated in a test tube until it melts and gives a clear liquid. Two platinum or gold electrodes, spaced approx. 1mm, are dipped into the liquid alum and lifted out so that a certain Amount of liquid remaining between the electrodes. After a few hours - at Room temperature - the humidity sensor can be used. The electrical resistance of such a sensor is at 50% relative humidity (contact surface 1 x 1 x 1 mm) 5 megohms.

In Spuren beigefügte Metallvereunreinigungen wie Cu, Ni, Cr, Fe usw. erhöhen die Empfindlichkeit des Fühlers.Metal impurities such as Cu, Ni, Cr, Fe, etc., added in traces. increase the sensitivity of the sensor.

BEISPIEL 2 2 G K Al(SO4)2 12 H2O in feingepulverter Form, werden mit 100 mg reinem Glycerol gemischr. Die Mischung wird -wie in Beispiel 1- geschmolzen. Auch die weitere Herstellung eines Fühlers ist aus Beispiel 1 zu entnehmen. Der elektrische Widerstand des Fühlers ist ca. 20 kiloohm. Der elektrische Widerstand ist in Proportion zu der prozentualen Menge von Glycerol. EXAMPLE 2 2 G K Al (SO4) 2 12 H2O in finely powdered form with 100 mg pure glycerol mixed. The mixture is melted as in Example 1-. The further manufacture of a sensor can also be found in Example 1. Of the electrical resistance of the sensor is approx. 20 kiloohm. The electrical resistance is in proportion to the percentage of glycerol.

Claims (4)

PATENTANSPRÜCHE 1. Verfahren zur Herstellung von hochempfindlichen Feuchtefühlern dadurch gekennzeichnet, daß ein anorganisches Doppelsalz durch schmelzen zwischen zwei Elektroden angebracht wird. Das Doppels 1z kann auch mit Spuren von Metallverunreinigungen versetzt werden, oder mit einer organischen Substanz gemischt werden. PATENT CLAIMS 1. Process for the production of highly sensitive Humidity sensors characterized in that an inorganic double salt melts through placed between two electrodes. The double 1z can also be used with traces of Metal impurities are added or mixed with an organic substance will. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das anorganische Doppelsalz ein Alaun oder eins von der Serie der Doppelsalze isomorph mit K Al(SO4)2 12 H2O ist. 2. The method according to claim 1, characterized in that the inorganic Double salt an alum or one of the series of double salts isomorphic with K Al (SO4) 2 12 is H2O. 3. Verfahren nach Anspruch 1 und 2, dadurch gekennzeichnet, daß sie Spuren von Metallvereunreinigungen, die man zur Erhöhung der Empfindlichkeit das Feuchtefühlers zusetzen kann, Eisen, Kupfer, Nickel oder Chrom sind. 3. The method according to claim 1 and 2, characterized in that it Traces of metal contamination that can be used to increase sensitivity Humidity sensor can add, are iron, copper, nickel or chromium. 4. Verfahren nach Anspruch 1, 2 und 3, dadurch gekennzeichnet, daß die organische Substanz, die man zur Verminderung der des elektrischen Widerstands des Feuchtefühlers zusetzen kann, ein aliphatischer oder aromatischer Polyalkohol ist. 4. The method according to claim 1, 2 and 3, characterized in that the organic substance that is used to reduce the electrical resistance of the humidity sensor can add an aliphatic or aromatic polyalcohol is.
DE19752554019 1975-12-02 1975-12-02 Humidity sensor Expired DE2554019C3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19752554019 DE2554019C3 (en) 1975-12-02 1975-12-02 Humidity sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752554019 DE2554019C3 (en) 1975-12-02 1975-12-02 Humidity sensor

Publications (3)

Publication Number Publication Date
DE2554019A1 true DE2554019A1 (en) 1977-06-16
DE2554019B2 DE2554019B2 (en) 1980-04-03
DE2554019C3 DE2554019C3 (en) 1980-12-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2433744A1 (en) * 1978-08-16 1980-03-14 Alliance Tech Ind Detecting water in normally gas-filled enclosure by means of a probe - with electrodes, resistance between which depends on condition, connected to current generator and circuit detecting current variation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4337809A1 (en) * 1993-11-05 1995-05-11 Abb Research Ltd Electric resistor and method for its fabrication
DE19528856A1 (en) * 1995-08-05 1997-02-06 Harald Dipl Ing Thiele Multi-functional compliance measuring system for clinical studies - records tablet dispensing and detects corresponding clinical and physiological parameters of patient for compliance checking.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2433744A1 (en) * 1978-08-16 1980-03-14 Alliance Tech Ind Detecting water in normally gas-filled enclosure by means of a probe - with electrodes, resistance between which depends on condition, connected to current generator and circuit detecting current variation

Also Published As

Publication number Publication date
DE2554019C3 (en) 1980-12-04
DE2554019B2 (en) 1980-04-03

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OD Request for examination
C3 Grant after two publication steps (3rd publication)
8327 Change in the person/name/address of the patent owner

Owner name: HOELZLE & CHELIUS GMBH, 6078 NEU ISENBURG, DE

8320 Willingness to grant licences declared (paragraph 23)
8339 Ceased/non-payment of the annual fee