DE2700229A1 - Liq. level indicating device - has heated foil probe whose resistance varies with depth of immersion - Google Patents

Liq. level indicating device - has heated foil probe whose resistance varies with depth of immersion

Info

Publication number
DE2700229A1
DE2700229A1 DE19772700229 DE2700229A DE2700229A1 DE 2700229 A1 DE2700229 A1 DE 2700229A1 DE 19772700229 DE19772700229 DE 19772700229 DE 2700229 A DE2700229 A DE 2700229A DE 2700229 A1 DE2700229 A1 DE 2700229A1
Authority
DE
Germany
Prior art keywords
liq
probe
immersion
depth
sensor
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.)
Pending
Application number
DE19772700229
Other languages
German (de)
Inventor
Wilhelm Jung
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.)
Mannesmann VDO AG
Original Assignee
Mannesmann VDO 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 Mannesmann VDO AG filed Critical Mannesmann VDO AG
Priority to DE19772700229 priority Critical patent/DE2700229A1/en
Publication of DE2700229A1 publication Critical patent/DE2700229A1/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • G01F23/246—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices

Abstract

A device measuring the level of a liq. in a container consists of a heated probe of which the resistance varies indicating its depth of immersion. A constant current source (3) feeds the probe (2) by means of a pair of connection wires (7, 8). The voltage developed across the probe, which is dependent on its resistance, is indicated by a meter (4). The probe is partially immersed in the liq. and carries a sensing track (6), pref. of copper. The track, which is mounted on a thin insulating foil (5) follows a meandering path to increase its sensitivity. Pref. the sensing track is covered with an insulating coating to prevent spurious readings being obtained as a result of by-pass current flowing through the liq.

Description

Fülls@ng@@ßeinrichtung Filling device

Die Erfindung bezicht sich auf eine Einrichtung zum Erfassen der Füllhand in Flüssigkeits@ehltern mit einem elektrisch beheizten Fühler, dessen fühlhöhenabhängige Widerstandsänderung zut Anzeige gebracht wird.The invention relates to a device for detecting the filling hand in liquid containers with an electrically heated sensor, its sensor height-dependent Change in resistance is brought to the display.

Bekannte Einrichtungen dieser Gattang bestehen im allgemeinen aus einem Fühler mit einem Meßdraht aus einem Widerstandematerial, dur di@cktdurcht einem durch ihr hindurchfließenden Strom oder indirekt mittels eienr Heizeinrichtung beheizt ist. An den Stellen, an denen sich der Meßdraht in der Flüssgkeit befindet, ist aufgru@i der relativ guten Wärweübertragung zwischen dem Meßdraht und dar Flüssigkeit der Widerstand des Meßdrahtes niedriger als an den nicht@@spülten Meßdrahtstellen, su daß der g@samte Widerstand je nach Behälterfülung zwischen einem Hächstwert und einem Tiefsh@@rt schwankt. Der sich füllstandsabhängig ändernde Widerstandswert wird mittels eines Anz@geinstruments angezeigt.Known institutions of this type generally consist of a sensor with a measuring wire made of a resistance material, thick through a current flowing through it or indirectly by means of a heating device is heated. At the points where the measuring wire is in the liquid, is due to the relatively good heat transfer between the measuring wire and the liquid the resistance of the measuring wire is lower than at the non-flushed measuring wire points, su that the total resistance depending on the tank filling between a maximum value and fluctuates to a low @@ rt. The resistance value that changes depending on the level is displayed by means of a display instrument.

Diese bekannten Einrichtungen haben den Nachteil, daß der verhältnismäßig dünne, zwischen zwei Endpunkten frei aufgespannte Meßdraht bei starken Flüssigkeitsschwankungen zerrissen oder aus seinen Vernakerungen gerissen werden kann. Zwar besteht die Müglichkeitm durch Anordnung einer entsprachenden Schutzülle um den Draht diesen Nachteil weitgehend beheben zu können, jeduch verteuert sich dadurch der Fühler nicht unwesentlich. Hinzu kommt, daß die Herstellung der Fühler verhältnismäßig schwierig und eine vollautomatische Herstellung nicht oder allanfalls nur mit erheblichem Aufwand mäglich ist. Dies gilt in gleicher Weise auch für Ausführungsformen, bei denen der Meßdraht auf einen Stab aufgewickelt ist.These known devices have the disadvantage that the relatively thin measuring wire stretched freely between two end points in the event of strong fluid fluctuations can be torn or torn from its Vernakerungen. Although there is a possibility by arranging an appropriate protective sheath around the wire this disadvantage largely to be able to remedy, however, the sensor is not insignificantly expensive. In addition, the production of the sensor is relatively difficult and fully automatic Production is not possible or only possible with considerable effort. this applies in the same way to embodiments in which the measuring wire on a Rod is wound up.

Diese Nachteile sollen durch die Erfindung h@@@@@igt werden. Es ist daher Aufgabe der Urfindunn, eine Füllhöhermeßeinrichtung zu schaffen, deren Fühler einen mäglichst herstellungsgünstigen Aufban besitzt und insbes@dere voll@utomatisch herstellbar ist.These disadvantages are intended to be addressed by the invention. It is therefore the task of Urfindunn to create a level measuring device, its sensor Has a construction that is as inexpensive to manufacture as possible and, in particular, is fully @ utomatic can be produced.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Fühleraus einem dünnen Träger und einer darauf fest haftenden Leiterbahn, vurzugsweise nus Kupfer, besteht.This object is achieved according to the invention in that the sensor from a thin carrier and a conductor track firmly adhering to it, preferably nus Copper.

Ein derartiger Fühler läßt sich, wie sich g@@@g@ hat, ohne Schwierigkeitem und ohne großen Aufwand vollautomatisch hexstellen, beispielsweise durch Beschichten @ires dünnen Trägerbandes mit der Leiterbahn im Durchlaufverfahren und auschließendes Ablängen das Bandes auf die gewünschte Länge.Such a feeler can be, as g @@@ g @ has, without difficulty and hexing fully automatically without great effort, for example by coating @ires thin carrier tape with the conductor track in the continuous process and exclusive Cut the tape to the required length.

In einer bevorqugien Ausführungsform der Erfindung ist der Fühler nach Art einer flexiblen Leiterplatte bzw. Leiterfolie aufgebeut.In a preferred embodiment of the invention, the sensor is in the manner of a flexible printed circuit board or printed circuit foil.

Zur Erziclung einer möglichst greßen Widerstanesänderung zwischen minimalem und maximalem Behälterfüllniveau ist am zweckmäßigster, die Leiterbahn wehrfach gewunden ausgcbildet. Als zweckmäßig hat sich eine mäanderfärmig verlaufende Leiterbahn erwiesen.To produce the greatest possible change in resistance between minimum and maximum container filling level is most useful, the conductor track trained multiple times wound. A meandering one has proven to be useful Track proven.

Insbesondere bei Einrichtungen, die für die Erfassung der Füllhöhe leitender Flüssgkeiten in Flüssigkeitsbehältern vorgesehen sind, empfiehlt es sich, die Leiterbahn auf ihrer dem Träger abgewandten Seite mit einem isolierenden Überzung zu versehen. Auf diese Weise ist sicher unterbunden, daß ein zu der Leiterbabn parallen verlaufender Strompfad durch die Flüssigkeit auftritt, der das Meßergebnis verfälschen kann.Particularly in the case of devices that are used to record the fill level conductive liquids are provided in liquid containers, it is recommended that the conductor track on its side facing away from the carrier with an insulating coating to provide. In this way it is safely prevented that a parallel to the ladder babn running current path occurs through the liquid, which falsify the measurement result can.

Die Erfindung sei anhand der Zeichnung, die in zum Teil schematischer Derstellung ein Ausführungsbeispiel enthält, näher erläutert.The invention is based on the drawing, which is in part schematic Derstellung contains an exemplary embodiment, explained in more detail.

In einem schematisch dargestellen Ochälter 1, dessen @lüssigkeitsinhalt überwacht werden soll, befindet sich ein Fühler 2 einer Meßeinrichtung, die des weiteren eine Konstntstromquelle 3 und ein Anzeigeinstrument 4 aufweist.In a schematically represented Ochälters 1, whose @ liquid content is to be monitored, there is a sensor 2 of a measuring device that des further comprises a constant current source 3 and a display instrument 4.

Der Fühlcr 2 besteht aus einem dünnen, folienartigen Trager 5, der mit einer möanderförmig verlaufenden Leiterbahn 6 aus Kopfer kaschiert ist, und demgemäß einen einer Leiterfolei entsprechenden Aufbau besitzt. Die Leiterbahnenden sind über Anschlußdrähte 7 und 8 en das elektrische Netzwerk der Einrichtung angeschlessen.The Fühlcr 2 consists of a thin, film-like carrier 5, the is laminated with a meander-shaped conductor track 6 made of Kopfer, and accordingly has a structure corresponding to a conductor foil. The conductor ends are connected via connecting wires 7 and 8 en the electrical network of the device.

Claims (5)

Patentansprüche 1. Einrichtung zum Eifassen der Füllhöhe in Flässigkritsbehältern mit einem elektrisch beheizern Fühler, dessen füllhöhenabhängige Widerstandsänderung zur Anzeige gebracnt wird, dadurch gekennzeichnet, daß der Fühler (@) aus einem dünnen Träger (5) und einer darauf fest h@ftenden Leiterbahn (6), vorzugsweise aus Bupfer, besteht. Claims 1. Device for grasping the filling level in liquid fuel containers with an electrically heated sensor, its level-dependent change in resistance is burned for display, characterized in that the sensor (@) consists of a thin carrier (5) and a conductor track (6) firmly adhering to it, preferably made of Bupfer, there. 2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Fühler (2) nach Art einer flexiblen Leiterplette bzw. Leiterfolie aufgebaut ist. 2. Device according to claim 1, characterized in that the sensor (2) is constructed in the manner of a flexible printed circuit board or printed circuit foil. 3. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Leiterbahn (6) mehrfach gewunden ausgebildet ist. 3. Device according to claim 1 or 2, characterized in that the conductor track (6) is designed to be wound several times. 4. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die. 4. Device according to claim 3, characterized in that the. Leiterbahn (6) mäanderförmig ausgebildet ist. Conductor track (6) is designed in a meandering shape. 5. Einrichtung nach einem der Ansprüche 1 bis 4 für leitende Flüssgkeiten, dadurch gekennzeichnet, daß die Leiterbahn (6) auf ihrer dem Träger (5) abgewandten Seite mit einem isolierenden Überzung versehen ist. 5. Device according to one of claims 1 to 4 for conductive liquids, characterized in that the conductor track (6) on its facing away from the carrier (5) Side is provided with an insulating cover.
DE19772700229 1977-01-05 1977-01-05 Liq. level indicating device - has heated foil probe whose resistance varies with depth of immersion Pending DE2700229A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19772700229 DE2700229A1 (en) 1977-01-05 1977-01-05 Liq. level indicating device - has heated foil probe whose resistance varies with depth of immersion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19772700229 DE2700229A1 (en) 1977-01-05 1977-01-05 Liq. level indicating device - has heated foil probe whose resistance varies with depth of immersion

Publications (1)

Publication Number Publication Date
DE2700229A1 true DE2700229A1 (en) 1978-07-13

Family

ID=5998140

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19772700229 Pending DE2700229A1 (en) 1977-01-05 1977-01-05 Liq. level indicating device - has heated foil probe whose resistance varies with depth of immersion

Country Status (1)

Country Link
DE (1) DE2700229A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2841889A1 (en) * 1978-09-26 1980-03-27 Siemens Ag Meter for fuel level in tank - has temp. sensitive resistor immersed in liq. and supplied with constant current
EP0009252A1 (en) * 1978-09-26 1980-04-02 Siemens Aktiengesellschaft Level gauging device for a container filled at least partially with a liquid
FR2501860A1 (en) * 1981-03-10 1982-09-17 Draloric Electronic ELECTROTHERMIC LEVEL INDICATOR AND METHOD FOR PRODUCING THE SAME
DE3137153A1 (en) * 1981-09-18 1983-04-07 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Appliance for measuring the filling level
FR2573866A1 (en) * 1984-11-27 1986-05-30 Veglia E D PROBE FOR MEASURING THE LEVEL OF A LIQUID
DE19858695A1 (en) * 1998-12-18 2000-06-21 Mannesmann Vdo Ag Filling level sensor for motor vehicle employs resistance sensor with horizontal and vertical wire sections

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2841889A1 (en) * 1978-09-26 1980-03-27 Siemens Ag Meter for fuel level in tank - has temp. sensitive resistor immersed in liq. and supplied with constant current
EP0009252A1 (en) * 1978-09-26 1980-04-02 Siemens Aktiengesellschaft Level gauging device for a container filled at least partially with a liquid
FR2501860A1 (en) * 1981-03-10 1982-09-17 Draloric Electronic ELECTROTHERMIC LEVEL INDICATOR AND METHOD FOR PRODUCING THE SAME
DE3108969A1 (en) * 1981-03-10 1982-09-30 Draloric Electronic GmbH, 8672 Selb ELECTRIC THERMAL LEVEL INDICATOR AND METHOD FOR THEIR PRODUCTION
DE3137153A1 (en) * 1981-09-18 1983-04-07 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Appliance for measuring the filling level
FR2573866A1 (en) * 1984-11-27 1986-05-30 Veglia E D PROBE FOR MEASURING THE LEVEL OF A LIQUID
EP0184497A1 (en) * 1984-11-27 1986-06-11 Jaeger Liquid level measuring probe
US4679432A (en) * 1984-11-27 1987-07-14 Veglia Probe for measuring the level of a liquid
DE19858695A1 (en) * 1998-12-18 2000-06-21 Mannesmann Vdo Ag Filling level sensor for motor vehicle employs resistance sensor with horizontal and vertical wire sections
DE19858695B4 (en) * 1998-12-18 2005-12-22 Siemens Ag level sensor

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