CH682183A5 - Humidity measuring sensor for air-conditioning system - has copper@ or copper@ alloy sintered filter enclosing capacitive measuring element to provide protection against aggresive gases - Google Patents
Humidity measuring sensor for air-conditioning system - has copper@ or copper@ alloy sintered filter enclosing capacitive measuring element to provide protection against aggresive gases Download PDFInfo
- Publication number
- CH682183A5 CH682183A5 CH136691A CH136691A CH682183A5 CH 682183 A5 CH682183 A5 CH 682183A5 CH 136691 A CH136691 A CH 136691A CH 136691 A CH136691 A CH 136691A CH 682183 A5 CH682183 A5 CH 682183A5
- Authority
- CH
- Switzerland
- Prior art keywords
- copper
- measuring element
- gases
- air
- conditioning system
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (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)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The sensor comprises a measuring element (1) surrounded by a filter (5) made of copper or an alloy with a high copper content. Pref. the measuring element (1) acts as a capacitive humidity sensor coupled via a pair of lead wires (2) to an evaluation circuit contained in a separate housing (3). The lead wires (2) extend through a tube (4) between the measuring element (1) and the evaluation circuit, with the sintered, porous filter (5) fitted to its free end. USE/ADVANTAGE - For protecting humidity sensor for air-conditioning system from damage to increase lifetime.
Description
Die Erfindung bezieht sich auf einen Fühler zur Messung von Zustandsgrössen in Gasen gemäss dem Oberbegriff des Anspruchs 1.
Solche Fühler eignen sich beispielsweise zur Messung der Luftfeuchtigkeit und werden im Zusammenhang mit der Regelung der Klimatisierung von Räumen verwendet.
Ein Feuchtefühler ist aus der Druckschrift "Raumfeuchtefühler QFA63" (Landis & Gyr-Druckschrift 3454) bekannt. Das Messelement ist dabei durch ein korrosionsbeständiges Sintermetallfilter geschützt.
Der Erfindung liegt die Aufgabe zugrunde, einen Fühler zur Messung von Zustandsgrössen in Gasen zu schaffen, der in aggresiver Umgebung eine erhöhte Lebensdauer aufweist.
Die genannte Aufgabe wird erfindungsgemäss durch die Merkmale des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen ergeben sich aus den abhängigen Ansprüchen.
Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand einer Zeichnung näher erläutert. Die einzige Figur zeigt einen teilweisen Schnitt durch einen Fühler zur Messung von Zustandsgrössen in Gasen.
In der Figur bedeutet 1 ein Messelement. Dieses Messelement 1 kann beispielsweise ein kapazitiver Feuchtesensor sein. Es ist mittels eines Kabelpaars 2 an eine innerhalb eines Gehäuses 3 angeordnete, nicht dargestellte Auswerteschaltung angeschlossen. Das Kabelpaar 2 verläuft innerhalb eines Rohres 4 zwischen dem Messelement 1 und der Auswerteschaltung. Das dem Gehäuse 3 abgewandte Ende des Rohres 4 ist mittels eines Filters 5 verschlossen, das das Messelement 1 umgibt. Das Filter 5 ist porös, so dass Gas, dessen Eigenschaftswert zu bestimmen ist, hindurchtreten und in Kontakt mit dem Messelement 1 kommen kann.
Das Filter 5 besteht im wesentlichen aus Kupfer oder einer hochkupferhaltigen Legierung. Damit wird erreicht, dass die die Aggresivität verursachenden chemischen Agenzien, beispielsweise Chlorgas, mit dem Kupfer reagieren und dadurch aus dem zum Messelement 1 vordringenden Gas entfernt werden. Damit können sie am Messelement 1 selbst keinen Schaden anrichten, der die Ursache der verkürzten Lebensdauer ist. Als Beispiel solcher durch das Filter 5 vermeidbarer Schäden ist die Zerstörung von Gold, das als Leiterbahn und Kontaktfläche von kapazitiven Feuchtesensoren Verwendung findet, durch Chlorgas genannt. Somit lässt sich die Lebensdauer des Messelements 1 deutlich erhöhen.
Das Filter 5 kann verwirklicht sein durch ein innerhalb eines Käfigs angeordnetes Pulver aus Kupfer bzw. einer hochkupferhaltigen Legierung.
Es ist vorteilhaft, wenn das Kupfer bzw. die hochkupferhaltige Legierung oberflächenaktiv ist. Damit wird die Reaktionsfähigkeit des Filters 5 erhöht. Das Filter 5 kann vorteilhaft ein Sinterkörper sein. Die hohe Oberflächenaktivität wird durch Sintern in desoxidierender Atmosphäre erreicht.
The invention relates to a sensor for measuring state variables in gases according to the preamble of claim 1.
Such sensors are suitable, for example, for measuring the air humidity and are used in connection with the regulation of the air conditioning in rooms.
A humidity sensor is known from the publication "Room humidity sensor QFA63" (Landis & Gyr publication 3454). The measuring element is protected by a corrosion-resistant sintered metal filter.
The invention has for its object to provide a sensor for measuring state variables in gases, which has an increased service life in an aggressive environment.
According to the invention, the stated object is achieved by the features of claim 1. Advantageous configurations result from the dependent claims.
An exemplary embodiment of the invention is explained in more detail below with reference to a drawing. The single figure shows a partial section through a sensor for measuring state variables in gases.
In the figure, 1 means a measuring element. This measuring element 1 can be a capacitive moisture sensor, for example. It is connected by means of a cable pair 2 to an evaluation circuit, not shown, arranged within a housing 3. The cable pair 2 runs within a tube 4 between the measuring element 1 and the evaluation circuit. The end of the tube 4 facing away from the housing 3 is closed by a filter 5 which surrounds the measuring element 1. The filter 5 is porous, so that gas, the property value of which is to be determined, can pass through and come into contact with the measuring element 1.
The filter 5 consists essentially of copper or a high copper alloy. It is thereby achieved that the chemical agents causing the aggressiveness, for example chlorine gas, react with the copper and are thereby removed from the gas penetrating to the measuring element 1. This means that they cannot cause any damage to the measuring element 1 itself, which is the cause of the shortened service life. The destruction of gold, which is used as a conductor track and contact surface of capacitive moisture sensors, by chlorine gas is mentioned as an example of such damage which can be avoided by the filter 5. The service life of the measuring element 1 can thus be significantly increased.
The filter 5 can be realized by a powder made of copper or a high copper-containing alloy arranged within a cage.
It is advantageous if the copper or the high-copper alloy is surface-active. This increases the responsiveness of the filter 5. The filter 5 can advantageously be a sintered body. The high surface activity is achieved by sintering in a deoxidizing atmosphere.
Claims (3)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH136691A CH682183A5 (en) | 1991-05-07 | 1991-05-07 | Humidity measuring sensor for air-conditioning system - has copper@ or copper@ alloy sintered filter enclosing capacitive measuring element to provide protection against aggresive gases |
| DE9205704U DE9205704U1 (en) | 1991-05-07 | 1992-04-28 | Sensors for measuring state variables in gases |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH136691A CH682183A5 (en) | 1991-05-07 | 1991-05-07 | Humidity measuring sensor for air-conditioning system - has copper@ or copper@ alloy sintered filter enclosing capacitive measuring element to provide protection against aggresive gases |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH682183A5 true CH682183A5 (en) | 1993-07-30 |
Family
ID=4208747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH136691A CH682183A5 (en) | 1991-05-07 | 1991-05-07 | Humidity measuring sensor for air-conditioning system - has copper@ or copper@ alloy sintered filter enclosing capacitive measuring element to provide protection against aggresive gases |
Country Status (2)
| Country | Link |
|---|---|
| CH (1) | CH682183A5 (en) |
| DE (1) | DE9205704U1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1201912A3 (en) * | 2000-10-26 | 2002-10-30 | Filterwerk Mann + Hummel Gmbh | Air intake system |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4300780A1 (en) * | 1993-01-14 | 1994-07-21 | Bosch Gmbh Robert | Measuring device for detecting pollutants in the fresh air, in particular a vehicle compartment |
| FR2793025B1 (en) * | 1999-04-27 | 2002-12-27 | Valeo Climatisation | PROTECTED RELATIVE HUMIDITY SENSOR, PARTICULARLY FOR HEATING AND / OR AIR CONDITIONING APPARATUS |
| WO2007079516A2 (en) * | 2006-01-12 | 2007-07-19 | Avl List Gmbh | Sensor device and method for monitoring a fuel cell system |
-
1991
- 1991-05-07 CH CH136691A patent/CH682183A5/en not_active IP Right Cessation
-
1992
- 1992-04-28 DE DE9205704U patent/DE9205704U1/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1201912A3 (en) * | 2000-10-26 | 2002-10-30 | Filterwerk Mann + Hummel Gmbh | Air intake system |
| US6564768B2 (en) | 2000-10-26 | 2003-05-20 | Filterwerk Mann & Hummel Gmbh | Air intake system for an internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| DE9205704U1 (en) | 1992-06-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PFA | Name/firm changed |
Owner name: LANDIS & GYR BUSINESS SUPPORT AG TRANSFER- SIEMENS |
|
| PL | Patent ceased |