DE19850291C1 - Capacitive measuring probe for continuous monitoring of container filling level; has integrated thermoelement positioned next to capacitive measuring electrode - Google Patents

Capacitive measuring probe for continuous monitoring of container filling level; has integrated thermoelement positioned next to capacitive measuring electrode

Info

Publication number
DE19850291C1
DE19850291C1 DE1998150291 DE19850291A DE19850291C1 DE 19850291 C1 DE19850291 C1 DE 19850291C1 DE 1998150291 DE1998150291 DE 1998150291 DE 19850291 A DE19850291 A DE 19850291A DE 19850291 C1 DE19850291 C1 DE 19850291C1
Authority
DE
Germany
Prior art keywords
electrode
measuring
capacitive measuring
measuring probe
measuring electrode
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.)
Expired - Lifetime
Application number
DE1998150291
Other languages
German (de)
Inventor
Armin Kohler
Ulrich Pok
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.)
RECHNER IND ELEKTRONIK GmbH
Original Assignee
RECHNER IND ELEKTRONIK 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 RECHNER IND ELEKTRONIK GmbH filed Critical RECHNER IND ELEKTRONIK GmbH
Priority to DE1998150291 priority Critical patent/DE19850291C1/en
Application granted granted Critical
Publication of DE19850291C1 publication Critical patent/DE19850291C1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G01F23/26—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/268—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors mounting arrangements of probes
    • 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
    • G01F23/26—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • 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
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
    • 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
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/226—Construction of measuring vessels; Electrodes therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605—Measuring capacitance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2617—Measuring dielectric properties, e.g. constants
    • G01R27/2635—Sample holders, electrodes or excitation arrangements, e.g. sensors or measuring cells
    • G01R27/2647—Sample holders, electrodes or excitation arrangements, e.g. sensors or measuring cells of coaxial or concentric type, e.g. with the sample in a coaxial line
    • G01R27/2652—Sample holders, electrodes or excitation arrangements, e.g. sensors or measuring cells of coaxial or concentric type, e.g. with the sample in a coaxial line open-ended type, e.g. abutting against the sample

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Electromagnetism (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

The probe has a cylindrical measuring electrode (2) and a cylindrical screening electrode (3), which are coupled to a cable conductor and the screening of a coaxial cable (20), respectively. A thermoelement (10) is positioned next to the measuring electrode, and is enclosed by a protective mantle (5) coupled to the screening electrode.

Description

Die Erfindung betrifft eine kapazitive Meßsonde, bei der in der Nachbarschaft wenigstens einer insbesondere zylindrischen Meßelektrode wenigstens eine insbesondere zylindrische Schirmelektrode angeordnet is und die Abschirmung eines Koaxialkabels mit der Schirmelektrode und die Seele des Koaxialkabels mit der Meßelektrode verbunden sind.The invention relates to a capacitive probe in the neighborhood at least one in particular cylindrical measuring electrode at least one in particular cylindrical shield electrode is arranged and the shield a coaxial cable with the shield electrode and the core of the coaxial cable the measuring electrode are connected.

Aus dem Dokument DE 195 28 384 A1 ist eine kapazitive Meßeinrichtung zur kontinuierlichen Standregelung für Medien unterschiedlicher Dielektrizitätskonstanten bekannt, die zur Erfassung von Kapazitätsänderungen eine eingangs genannte Meßsonde benutzt. In dem Dokument DE 43 34 663-A wird ein Verfahren sowie eine Vorrichtung zur kontinuierlichen Messung des Füllstandes eines Flüssigkeitsbehälters unter Verwendung einer kapazitiven Meßsonde beschrieben, deren mit steigender Füllhöhe zunehmende Kapazität in einer elektrischen Meßschaltung als Maß für den Füllstand ausgewertet wird. Dabei weist die Meßsonde eine Innenelektrode und eine diese im Abstand umhüllende Außenelektrode auf, wobei der Zwischenraum zwischen Innen- und Außenelektrode von der im Flüssigkeitsbehälter befindlichen Flüssigkeitspegel gleich gefüllt ist, und wobei ein in der Meßsonde integrierter Temperaturfühler sowie eine programmierbare Meß- und Auswerteelektronik vorgesehen sind.Document DE 195 28 384 A1 describes a capacitive measuring device for continuous level control for different media Dielectric constant known for the detection of changes in capacitance uses a measuring probe mentioned at the beginning. In document DE 43 34 663-A is a method and an apparatus for continuous measurement of the Level of a liquid container using a capacitive Measuring probe described whose capacity increases with increasing fill level in an electrical measuring circuit is evaluated as a measure of the fill level. Here the measuring probe has an inner electrode and an envelope enclosing it at a distance Outer electrode, with the space between the inner and External electrode from the liquid level in the liquid container is filled equally, and a temperature sensor integrated in the measuring probe and a programmable measuring and evaluation electronics are provided.

In der Schrift US 5,513,399 wird eine digitale Erfassungsvorrichtung für einen Flüssigkeitspegel beschrieben, die Veränderungen in der Dielektrizitätskonstanten der Flüssigkeit erfaßt. Die Vorrichtung weist eine Reihe kapazitiver Elemente auf, die in der zu erfassenden Flüssigkeit angeordnet sind, wobei mehrere einzelne unterteilte Platten längs der Meßachse der zu erfassenden Flüssigkeit vorgesehen sind. Eine Steuereinheit gibt Impulse auf die Platten, deren Ausgänge einem Verstärker zugeführt werden, welcher eine Reihe von entsprechenden analogen Ausgangsspannungen liefert. Diese analogen Ausgangsspannungen werden dann einem Spitzenspannungsdetektor zugeführt, der eine Reihe von Spitzenspannungssignalen, die für die Größe der analogen Ausgangsspannungen repräsentativ sind, erzeugt. Die Steuereinheit vergleicht schrittweise diese Werte mit einem vorgegebenen Referenzwert und das Vergleichsergebnis erlaubt eine Anzeige dahingehend, welche der Platten wenigstens teilweise in die Flüssigkeit eintaucht.In US 5,513,399 a digital detection device for a Liquid levels described the changes in dielectric constant of the liquid. The device has a series of capacitive elements, which are arranged in the liquid to be detected, with several individual divided plates provided along the measuring axis of the liquid to be detected are. A control unit gives impulses to the plates, the outputs of which one Amplifiers are supplied, which are a series of corresponding analog Provides output voltages. These analog output voltages are then fed to a peak voltage detector which is a series of  Peak voltage signals, for the size of the analog output voltages are representative. The control unit compares these values step by step with a given reference value and the comparison result allows one Indicate which of the plates is at least partially in the liquid immersed.

Der Erfindung liegt die Aufgabe zugrunde, bei der eingangs genannten Meßsonde Maßnahmen vorzusehen, die eine genauere Erfassung der Dielektrizitätskonstanten der Medien erlauben. Dazu schlägt die Erfindung vor, die Spitze eines Mantel- Thermoelementes in der Nähe der Meßelektrode zu halten und den Mantel des Mantel-Thermoelementes mit der Schirmelektrode zu verbinden. Unter Spitze eines Mantel-Thermoelementes wird diejenige Verbindungsstelle der beiden unterschiedlichen Materialien des Thermoelementes verstanden, an welcher die Thermospannung auftritt. Durch die Erfindung wird die Meßgenauigkeit durch geleichzeitige Erfassung der Medientemperatur erhöht, wobei durch die besondere Anordnung des Mantel-Thermoelementes das Einbringen eines störenden Potentials in das Elektrodensystem verhindert wird.The invention has for its object in the above-mentioned measuring probe Provide measures that allow a more accurate detection of the dielectric constant allow the media. To this end, the invention proposes that the tip of a jacket Keep thermocouple near the measuring electrode and the jacket of the To connect jacket thermocouple with the shield electrode. Under lace a jacket thermocouple becomes the junction of the two understood different materials of the thermocouple on which the Thermal voltage occurs. By the invention, the accuracy of measurement simultaneous detection of the media temperature increased, due to the special Arrangement of the jacket thermocouple introducing an annoying Potential in the electrode system is prevented.

Die Erfindung ist dann mit besonderem Vorteil einsetzbar, wenn die elektrische Messung nach dem Prinzip des kapazitiven Spannungsteilers erfolgt, bei welchem die Meßkapazität der Längskondensator in einem RC-Koppelglied (Hochpaß) ist. In bevorzugter Ausgestaltung der Erfindung sind die Schirmelektrode und/oder die Meßelektrode hohlzylindrisch ausgeführt. Zweckmäßig ist die Schirmelektrode koaxial zur Meßelektrode angeordnet und das Mantel-Thermoelement ist axial durch die Schirmelektrode und die Meßelektrode geführt. Zum Schutz des Meßsystems empfiehlt es sich, die Schirmelektrode, die Meßelektrode und das Mantel-Thermoelement mit einer thermisch leitfähigen und elektrisch isolierenden Hülse zu umgeben, in deren Boden die Spitze des Mantel-Thermoelementes dann zweckmäßig verankert sein kann. Die Dynamik der Temperaturmessung wird verbessert, wenn die Thermoelement-Spitze durch den Boden der Hülse hindurchgeführt ist. In dem Mantel-Thermoelement können beliebige Thermopaarungen eingesetzt werden, also zum Beispiel Fe/Ko oder Ni/CrNi.The invention can be used with particular advantage if the electrical Measurement is based on the principle of the capacitive voltage divider, in which the measuring capacitance of the series capacitor in an RC coupling element (high pass). In a preferred embodiment of the invention, the shield electrode and / or the Measuring electrode made hollow cylindrical. The shield electrode is useful arranged coaxially to the measuring electrode and the jacket thermocouple is axial  passed through the shield electrode and the measuring electrode. To protect the Measuring system it is recommended to use the shield electrode, the measuring electrode and the Sheathed thermocouple with a thermally conductive and electrically insulating To surround sleeve, in the bottom of which the tip of the jacket thermocouple can be appropriately anchored. The dynamics of temperature measurement will improved when the thermocouple tip through the bottom of the sleeve is passed through. Any can in the jacket thermocouple Thermocouples are used, for example Fe / Ko or Ni / CrNi.

Im übrigen sind vorteilhafte Ausführungsformen der Erfindung in den Unteransprüchen angegeben. Die Erfindung wird nachstehend anhand des in der beigefügten Zeichnung schematisch dargestellten Ausführungsbeispiels beschrieben.In addition, advantageous embodiments of the invention in the Subclaims specified. The invention is illustrated below in the attached drawing schematically illustrated embodiment described.

In ein oben offenes und unten ballig verschlossenes Rohr 1 aus thermisch leitfähigem und elektrisch isolierendem Kunststoff ist axial ein im Ganzen mit 10 bezeichnetes Mantel-Thermoelement üblicher Bauart axial eingesetzt. Die Spitze 12 des Mantel-Thermoelementes ist in der Mitte des balligen Rohrverschlusses in die Masse des Rohres 1 eingebettet. Der elektrisch leitfähige Schutzmantel 5 des Thermoelementes ist mittels einer elektrischen Leitung 14 mit einer auf Masse- Potential liegenden Schirmelektrode 3 eines kapazitiven Meßsystems verbunden.In a tube 1 made of thermally conductive and electrically insulating plastic which is open at the top and crowned at the bottom, a jacket thermocouple of a conventional type, designated overall by 10, is axially inserted. The tip 12 of the jacket thermocouple is embedded in the center of the spherical tube closure in the mass of the tube 1 . The electrically conductive protective jacket 5 of the thermocouple is connected by means of an electrical line 14 to a shield electrode 3 of a capacitive measuring system which is at ground potential.

Das kapazitive Meßsystem umfaßt eine in der Nähe des unteren Endes des Rohres 1 in diesem gehaltene hohlzylindrische Meßelektrode 2, welche mit der Seele 7 eines Koaxialkabels 20 verbunden ist. Ferner gehört zu dem kapazitiven Meßsystem die erwähnte hohlzylindrische Schirmelektrode, die im Rohr 1 koaxial und mit Abstand über der Meßelektrode 2 gehalten ist. Die Abschirmung 4 des Koaxialkabels 20 ist mittels einer elektrischen Leitung 8 mit der Schirmelektrode 3 verbunden. Das Koaxialkabel 20 ist aus der Öffnung des Rohres 1 heraus und zu einer nicht dargestellten Auswerteeinrichtung geführt. Das andere Ende der Seele 7 ist über einen ebenfalls nicht dargestellten Ohmschen Widerstand mit dem elektrischen Eingang der Auswerteeinrichtung verbunden und die Abschirmung 4 ist auf Massepotential gelegt.The capacitive measuring system comprises a hollow cylindrical measuring electrode 2 which is held in the vicinity of the lower end of the tube 1 and which is connected to the core 7 of a coaxial cable 20 . The capacitive measuring system also includes the hollow cylindrical shield electrode mentioned, which is held coaxially in the tube 1 and at a distance above the measuring electrode 2 . The shield 4 of the coaxial cable 20 is connected to the shield electrode 3 by means of an electrical line 8 . The coaxial cable 20 is led out of the opening of the tube 1 and to an evaluation device, not shown. The other end of the core 7 is connected to the electrical input of the evaluation device via an ohmic resistor, also not shown, and the shield 4 is connected to ground potential.

In der Nähe der Öffnung des Rohres 1 ist in diesem weit oberhalb des von der Meßelektrode abgewandten Endes der Schirmelektrode 3 ein Übergangsteil 6 vorgesehen, in welchem der Schutzmantel 5 endet. Jeder einzelne nicht dargestellte Innendraht des Thermoelementes ist für sich mit einer von zwei zugehörigen Ausgleichsleitungen 16, 18 elektrisch verbunden, welche für die Hinführung zur Auswerteeinrichtung hinreichende Flexibilität besitzen und preiswert sind.In the vicinity of the opening of the tube 1 , a transition part 6 is provided in this, far above the end of the shield electrode 3 facing away from the measuring electrode, in which the protective jacket 5 ends. Each individual inner wire (not shown) of the thermocouple is electrically connected to one of two associated compensating lines 16 , 18 , which have sufficient flexibility for leading to the evaluation device and are inexpensive.

Die beschriebene Meßsonde kann in ein Medium mit bestimmter Dielektrizitätskonstanten und variabler Temperatur eingetaucht werden, welches sich in einem leitfähigen und die andere Elektrode des Meßkondensators bildenden Behälter befindet und dessen Füllhöhe schwankt.The measuring probe described can be in a medium with certain Dielectric constant and variable temperature are immersed, which form in a conductive and the other electrode of the measuring capacitor Container is located and its fill level fluctuates.

Claims (7)

1. Kapazitive Meßsonde, bei der in der Nachbarschaft wenigstens einer insbesondere zylindrischen Meßelektrode wenigstens eine insbesondere zylindrische Schirmelektrode angeordnet ist und die Abschirmung eines Koaxialkabels mit der Schirmelektrode und die Seele des Koaxialkabels mit der Meßelektrode verbunden sind, dadurch gekennzeichnet, daß die Spitze (12) eines Mantel-Thermoelementes (10) in der Nähe der Meßelektrode (2) gehalten und der Schutzmäntel (5) des Mantel-Thermoelementes mit der Schirmelektrode (3) verbunden ist.1. Capacitive measuring probe in which at least one in particular cylindrical measuring electrode is arranged in the vicinity of at least one especially cylindrical measuring electrode and the shield of a coaxial cable is connected to the shield electrode and the core of the coaxial cable is connected to the measuring electrode, characterized in that the tip ( 12 ) a jacket thermocouple ( 10 ) in the vicinity of the measuring electrode ( 2 ) and the protective jacket ( 5 ) of the jacket thermocouple is connected to the shield electrode ( 3 ). 2. Meßsonde nach Anspruch 1, dadurch gekennzeichnet, daß die Meßelektrode (2) Teil eines mit einer Auswerteeinrichtung verbundenen RC-Koppelgliedes ist.2. Measuring probe according to claim 1, characterized in that the measuring electrode ( 2 ) is part of an RC coupling element connected to an evaluation device. 3. Meßsonde nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Schirmelektrode (3) und/oder die Meßelektrode (2) hohlzylindrisch ausgeführt sind.3. Measuring probe according to claim 1 or 2, characterized in that the shield electrode ( 3 ) and / or the measuring electrode ( 2 ) are hollow cylindrical. 4. Meßsonde nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Schirmelektrode (3) koaxial zur Meßelektrode (2) angeordnet und das Mantel-Thermoelement (10) axial durch die Schirmelektrode und die Meßelektrode geführt ist.4. Measuring probe according to one of the preceding claims, characterized in that the shield electrode ( 3 ) is arranged coaxially to the measuring electrode ( 2 ) and the jacket thermocouple ( 10 ) is guided axially through the shield electrode and the measuring electrode. 5. Meßsonde nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Schirmelektrode, die Meßelektrode und das Mantel-Thermoelement von einer thermisch leitfähigen, elektrisch isolierenden, rohrförmigen Hülse (1) umgeben sind.5. Measuring probe according to one of the preceding claims, characterized in that the shield electrode, the measuring electrode and the jacket thermocouple are surrounded by a thermally conductive, electrically insulating, tubular sleeve ( 1 ). 6. Meßsonde nach Anspruch 5, dadurch gekennzeichnet, daß die Spitze (12) im Boden der Hülse (1) verankert ist.6. Measuring probe according to claim 5, characterized in that the tip ( 12 ) is anchored in the bottom of the sleeve ( 1 ). 7. Meßsonde nach Anspruch 5, dadurch gekennzeichnet, daß die Spitze (12) durch den Boden der Hülse (1) hindurchgeführt ist.7. Measuring probe according to claim 5, characterized in that the tip ( 12 ) is passed through the bottom of the sleeve ( 1 ).
DE1998150291 1998-10-30 1998-10-30 Capacitive measuring probe for continuous monitoring of container filling level; has integrated thermoelement positioned next to capacitive measuring electrode Expired - Lifetime DE19850291C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1998150291 DE19850291C1 (en) 1998-10-30 1998-10-30 Capacitive measuring probe for continuous monitoring of container filling level; has integrated thermoelement positioned next to capacitive measuring electrode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1998150291 DE19850291C1 (en) 1998-10-30 1998-10-30 Capacitive measuring probe for continuous monitoring of container filling level; has integrated thermoelement positioned next to capacitive measuring electrode

Publications (1)

Publication Number Publication Date
DE19850291C1 true DE19850291C1 (en) 2000-02-17

Family

ID=7886302

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1998150291 Expired - Lifetime DE19850291C1 (en) 1998-10-30 1998-10-30 Capacitive measuring probe for continuous monitoring of container filling level; has integrated thermoelement positioned next to capacitive measuring electrode

Country Status (1)

Country Link
DE (1) DE19850291C1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1273909A1 (en) * 2001-07-06 2003-01-08 Moletherm Holding AG Sensor
DE102007059669A1 (en) * 2007-12-10 2009-06-25 Endress + Hauser Gmbh + Co. Kg Capacitive measuring device for determining and/or monitoring filling level of e.g. liquid, provided in container, has intermediate layer electrically conductive and surrounded partially by electrically isolating insulation layer
DE102008015052A1 (en) 2008-03-19 2009-09-24 Rechner Industrie-Elektronik Gmbh Rod-shaped capacitive level measuring sensor for analog or multi-channel limit value level measuring, has electrically isolating tubular outer hull made from one-sided locked plastic tube and pipe made from glass-fiber reinforced plastic
DE102008001100A1 (en) 2008-04-10 2009-10-15 Robert Bosch Gmbh Capacitive probe and method of making a capacitive probe
DE102018113040B3 (en) 2018-05-31 2019-10-24 Technische Universität Dresden System for the hydrostatic and capacitive determination of the level of a fluid medium in a container
CN112683363A (en) * 2020-12-04 2021-04-20 中广核工程有限公司 Installation method of seawater level measuring instrument of nuclear power station

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4334663A1 (en) * 1993-10-12 1995-04-13 Rolf Windhorst Method for continuously measuring the filling level of a liquid container and the temperature of the liquid, using a capacitive measuring probe which accurately indicates the volume even in the case of different shapes of container
DE19528384A1 (en) * 1995-08-02 1997-02-06 Pok Ulrich Dipl Ing Th Capacitive meter for continuous control of level of materials with different dielectric constants in e.g. hopper or tank - has upper and lower measurement electrodes screened from one another with surface ratio lower/upper of 1:2 and compensation for empty condition signal with outputs connected to linear differential amplifier
US5613399A (en) * 1993-10-27 1997-03-25 Kdi Precision Products, Inc. Method for liquid level detection

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4334663A1 (en) * 1993-10-12 1995-04-13 Rolf Windhorst Method for continuously measuring the filling level of a liquid container and the temperature of the liquid, using a capacitive measuring probe which accurately indicates the volume even in the case of different shapes of container
US5613399A (en) * 1993-10-27 1997-03-25 Kdi Precision Products, Inc. Method for liquid level detection
DE19528384A1 (en) * 1995-08-02 1997-02-06 Pok Ulrich Dipl Ing Th Capacitive meter for continuous control of level of materials with different dielectric constants in e.g. hopper or tank - has upper and lower measurement electrodes screened from one another with surface ratio lower/upper of 1:2 and compensation for empty condition signal with outputs connected to linear differential amplifier

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1273909A1 (en) * 2001-07-06 2003-01-08 Moletherm Holding AG Sensor
WO2003004976A2 (en) * 2001-07-06 2003-01-16 Moletherm Holding Ag Sensor
WO2003004976A3 (en) * 2001-07-06 2004-04-22 Moletherm Holding Ag Sensor
DE102007059669A1 (en) * 2007-12-10 2009-06-25 Endress + Hauser Gmbh + Co. Kg Capacitive measuring device for determining and/or monitoring filling level of e.g. liquid, provided in container, has intermediate layer electrically conductive and surrounded partially by electrically isolating insulation layer
DE102008015052A1 (en) 2008-03-19 2009-09-24 Rechner Industrie-Elektronik Gmbh Rod-shaped capacitive level measuring sensor for analog or multi-channel limit value level measuring, has electrically isolating tubular outer hull made from one-sided locked plastic tube and pipe made from glass-fiber reinforced plastic
DE102008001100A1 (en) 2008-04-10 2009-10-15 Robert Bosch Gmbh Capacitive probe and method of making a capacitive probe
DE102018113040B3 (en) 2018-05-31 2019-10-24 Technische Universität Dresden System for the hydrostatic and capacitive determination of the level of a fluid medium in a container
CN112683363A (en) * 2020-12-04 2021-04-20 中广核工程有限公司 Installation method of seawater level measuring instrument of nuclear power station

Similar Documents

Publication Publication Date Title
DE102013227051B4 (en) Measuring arrangement and method for temperature measurement and sensor cable for such a measuring arrangement
DE69329068T2 (en) SENSOR RESISTANCE MEASURING
DE69816995T2 (en) ARRANGEMENT OF SEVERAL RESISTIVE TRANSMITTERS FOR A CORIOLIS MASS FLOW METER
DE3104177A1 (en) CORROSION MEASUREMENT WITH SECONDARY TEMPERATURE COMPENSATION
DE2740289B2 (en) Device for monitoring the level of a liquid contained in a container
EP3237862B1 (en) Temperature probe
DE2947109A1 (en) CONDUCTIVE SENSOR
DE19850291C1 (en) Capacitive measuring probe for continuous monitoring of container filling level; has integrated thermoelement positioned next to capacitive measuring electrode
DE69726580T2 (en) CABLE FAULT MONITORING SYSTEM
DE4312813C2 (en) Arrangement for capacitive level measurement
DE2603185C2 (en) Arrangement for capacitive measurement of the fill level of a container
DE3824231C2 (en)
EP0927877B1 (en) A measuring device for a fuel gauge
EP1255969B1 (en) Device for determining the level of a medium in a container
DE2531784C2 (en) Measuring arrangement for temperature and pressure measurement of a medium in boreholes
DE3518186A1 (en) Device for detecting the effective dielectric constant of a medium, particularly for determining the water content in a filled container for oil or alcohol
DE102014102054A1 (en) Level sensor with electrode monitoring
EP3015877B1 (en) Method for calibrating a current measuring device
EP0927351A1 (en) Air quality measuring device
DE29805413U1 (en) Level sensor
DE19756159C1 (en) Sensor for detecting presence of electrically insulating fluid or loose material
DE3641987A1 (en) DEVICE FOR DETERMINING THE SLUME HEIGHT IN A METAL MELT
DE4412386C2 (en) Circuit arrangement for conductive level measurement
DE1466811A1 (en) Measuring device for determining the skin condition
DE3532524A1 (en) Device for measuring the transient potential of the encapsulation of a metal-encapsulated, gas-insulated high-voltage installation

Legal Events

Date Code Title Description
8100 Publication of the examined application without publication of unexamined application
D1 Grant (no unexamined application published) patent law 81
8364 No opposition during term of opposition
R071 Expiry of right