DE2554019A1 - Highly sensitive moisture detector - comprises double salt melt-applied between electrodes - Google Patents
Highly sensitive moisture detector - comprises double salt melt-applied between electrodesInfo
- 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
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
- G01N27/12—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
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 Fluid Adsorption Or Reactions (AREA)
Abstract
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)
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 |
Family
ID=5963178
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19752554019 Expired DE2554019C3 (en) | 1975-12-02 | 1975-12-02 | Humidity sensor |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2554019C3 (en) |
Cited By (1)
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)
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. |
-
1975
- 1975-12-02 DE DE19752554019 patent/DE2554019C3/en not_active Expired
Cited By (1)
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 |
---|---|
DE2554019B2 (en) | 1980-04-03 |
DE2554019C3 (en) | 1980-12-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OGA | New person/name/address of the applicant | ||
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 |