EP1325351A1 - Dispositif destine a determiner le niveau de remplissage d'un materiau dans un contenant - Google Patents

Dispositif destine a determiner le niveau de remplissage d'un materiau dans un contenant

Info

Publication number
EP1325351A1
EP1325351A1 EP01967276A EP01967276A EP1325351A1 EP 1325351 A1 EP1325351 A1 EP 1325351A1 EP 01967276 A EP01967276 A EP 01967276A EP 01967276 A EP01967276 A EP 01967276A EP 1325351 A1 EP1325351 A1 EP 1325351A1
Authority
EP
European Patent Office
Prior art keywords
antenna
container
filling material
opening
measurement signals
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.)
Ceased
Application number
EP01967276A
Other languages
German (de)
English (en)
Inventor
Roland Müller
Wolfgang Lubcke
Winfried Maier
Thomas Malzahn
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.)
Endress and Hauser SE and Co KG
Original Assignee
Endress and Hauser SE and Co KG
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 Endress and Hauser SE and Co KG filed Critical Endress and Hauser SE and Co KG
Publication of EP1325351A1 publication Critical patent/EP1325351A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • 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
    • G01F23/28—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 the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/06—Systems determining the position data of a target
    • G01S15/08—Systems for measuring distance only
    • G01S15/10—Systems for measuring distance only using transmission of interrupted, pulse-modulated waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/86—Combinations of sonar systems with lidar systems; Combinations of sonar systems with systems not using wave reflection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/521—Constructional features
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/225—Supports; Mounting means by structural association with other equipment or articles used in level-measurement devices, e.g. for level gauge measurement

Definitions

  • the invention relates to a device for determining the filling level of a filling material in a container with a signal generating unit that generates measurement signals, with at least one antenna that transmits the measurement signals in the direction of the surface of the filling material and that receives the measurement signals reflected on the surface of the filling material , and with a control / evaluation unit that determines the fill level of the filling material in the container on the basis of the running time of the measurement signals.
  • the measurement signals are preferably ultrasound signals or microwave signals.
  • Runtime methods take advantage of the physical laws, according to which the running distance is the product of the running time and the speed of propagation.
  • the running distance corresponds to twice the distance between the antenna and the surface of the product.
  • the useful echo signal i.e. the signal reflected on the surface of the product, and its transit time are determined using the so-called echo function or the digitized envelope, the envelope representing the amplitudes of the echo signals as a function of the distance 'antenna - surface of the product'.
  • the level itself then results from the difference between the known distance of the antenna to the bottom of the container and the distance of the surface of the medium to the antenna determined by the measurement.
  • the measurement signals are microwaves, both the pulse radar and the frequency modulation continuous wave radar (FMCW radar) can be used.
  • FMCW radar frequency modulation continuous wave radar
  • Microwave measuring devices that use pulse radar are sold by the applicant, for example under the name 'MICROPILOT'.
  • a device type that works with ultrasound signals is offered by the applicant, for example under the name 'PROSONIC'.
  • Both in the known ultrasonic measuring devices and in microwave measuring devices are the antennas via which the measuring signals in the direction of Surface of the filling material emitted or via which the measurement signals reflected on the surface of the filling material are received can be found in the lid area of the container. This arrangement is necessary so that the measurement signals strike the surface of the filling material essentially perpendicularly.
  • An antenna is preferably positioned in a nozzle which is already present in the lid of the container. In cases where there is no opening, it must be created specifically for the attachment of the antenna. In the simplest case, the measuring device is fastened in the nozzle opening of the cover via a flange.
  • the assembly and maintenance of a measuring device in the lid area of a container proves to be particularly cumbersome and difficult if no opening is provided there and an opening has to be created beforehand. Assembly and maintenance of the measuring device are particularly problematic for containers with large geometric dimensions - that is, the case common in industrial process and measuring technology.
  • openings in the side wall of the container in which the contents are stored can serve, for example, to accommodate a so-called bypass, that is to say a piece of pipe which is arranged parallel to the outer wall of the container.
  • they can also be provided for attaching a differential pressure sensor.
  • an opening must be provided both in the lower and in the upper region of the side wall of the container.
  • the already existing opening in the side wall can be a receiving opening for a pressure or temperature sensor or for a limit switch for determining and / or monitoring the maximum filling level of a filling material in the container. Whatever this opening was originally intended for - if it is located in the upper region of the side wall of the container, it can be used in connection with the device according to the invention.
  • the invention has for its object to propose a device that enables an inexpensive and simple assembly of a level measuring device, which works on the runtime principle, on a container.
  • an opening is provided in the upper region of a side wall of the container and in that the at least one antenna is positioned in this opening, the antenna being arranged or designed in this way is that the measurement signals are emitted essentially in the direction of the filling material or that the measuring signals reflected on the surface of the filling material are received by the antenna.
  • the transmitting and receiving unit can also be designed as separate units, it being entirely possible to arrange both antennas in a device designed as an integral unit.
  • openings in the upper region of the side wall of the container are preferably used on the one hand for the assembly of the fill level measuring device, the openings on the other hand already being present there. Both measures can of course considerably simplify the assembly and maintenance of the level measuring device. In many cases, the customer would also like to replace the existing differential pressure measurement technology with a measurement technology that works with electromagnetic measurement signals.
  • the antenna is essentially an elongated element, the outer dimensions of which are larger in the longitudinal direction and smaller in the transverse direction than the inner dimensions of the opening. Because of this configuration, it is possible to insert the antenna from the outside through the side wall into the interior of the container and to adjust it such that the measurement signals are emitted essentially in the direction of the surface of the filling material. In the simplest case, the antenna is adjusted by correspondingly rotating the elongated element about the longitudinal axis.
  • the antenna can be, for example, a leaky waveguide, a ridge waveguide or a Yagi antenna.
  • a separate rod antenna or a separate home antenna can also be provided as the antenna.
  • the rod antenna or the horn antenna is then preferably arranged in a foldable manner in the region of the end face of the elongate element.
  • the rod or horn antenna is oriented in the direction of the longitudinal axis of the elongate element, the antenna being dimensioned in this position in such a way that it is passed through from the outside Opening can be pushed.
  • the rod or horn antenna is pivoted through 90 ° so that it can now transmit the measurement signals in the direction of the surface of the filling material or can receive the measurement signals reflected on the surface ,
  • An advantageous embodiment provides an additional sensor that determines at least one process variable in the container.
  • This additional sensor is connected to the antenna, which determines the fill level over the transit time of measurement signals.
  • the additional sensor is preferably attached in the direction of the longitudinal axis of the antenna.
  • the additional sensor can be, for example, a vibration detector, that is to say a limit switch Determine and / or monitor the level in the container, act as a pressure sensor or a temperature sensor.
  • An advantageous development of the device according to the invention proposes that two antennas are arranged in or on the elongated element, which transmit measurement signals of different frequencies in the direction of the surface of the filling material or which receive the measuring signals reflected on the surface of the filling material ,
  • two antennas are arranged in and / or on the elongate element, one being used as a transmitting unit and the other as a receiving unit for measurement signals of a predetermined frequency. In the latter case, it is therefore a level sensor with a separate transmitter and receiver unit.
  • At least the additional sensor is a sensor that corresponds to a specified safety standard.
  • the following security standards can include: B. fulfilled by the sensor: Water Resources Act, ordinance regarding flammable liquids, Safety Integrity Level (SIL).
  • SIL Safety Integrity Level
  • a metallic shield can be found in the antenna area which is arranged in the opening of the side wall of the container or in an antenna area which is arranged in the immediate vicinity of the opening in the side wall of the container , This configuration effectively eliminates interference signals caused by reflections in the opening of the container wall (the so-called bell ringing), on the container wall or on adjacent internals inside the container.
  • the shield can be, for example, a metal sleeve.
  • an embodiment of the device according to the invention proposes that the additional sensor and / or that the antenna is / is provided with a protective layer, in particular with a dielectric protective layer, at least in the area that projects into the interior of the container.
  • a protective layer in particular with a dielectric protective layer, at least in the area that projects into the interior of the container.
  • This configuration is particularly advantageous when the antenna and / or the additional sensor come into direct contact with the filling material.
  • Protective layers that can be used in connection with the present invention have become known, for example, from EP 0 669 673 B1.
  • an outer housing which is fastened in the opening in the upper region of the side wall of the container, and that the antenna or the antenna with the additional sensor is positioned in the outer housing ,
  • the outer housing is with the container z. B. firmly connected via a flange.
  • the outer housing preferably consists of a dielectric material.
  • the antenna is arranged in the outer housing such that it can be rotated or pivoted about its longitudinal axis. An adjustment with respect to the recess described above is therefore easily possible. Adjustment is particularly necessary if the hole pattern of the customer flange is unknown. A radiation in the direction of the filling material is only guaranteed if the radiation direction is variable and adjustable relative to the hole pattern of the flange.
  • the measurement signals are conducted from the signal generation unit to the antenna via a conductive element.
  • the conductive element is e.g. B. a coaxial cable, a waveguide or a waveguide.
  • Fig. 1 shows a first embodiment of the device according to the invention.
  • the antenna 7 is integrated in the elongated element 8.
  • the outer dimensions of the elongated element 8 are larger in the longitudinal direction and smaller in the transverse direction than the inner dimensions of the opening 6, which can be found in the upper region of the side wall 5 of the container 4. Due to the dimensioning of the elongated element 8, it is possible to guide the antenna 7 through the opening 6 into the interior of the container 4 and to place it in such a way that the measurement signals strike the surface 3 of the filling material 2 essentially perpendicularly and accordingly into the antenna 7 are reflected back.
  • an asymmetrical horn antenna is used in the embodiment shown in FIGS. 3 and 3a.
  • the device 1 according to the invention is designed as a compact device, the Electronics part 11, ie the signal generation unit and the control / evaluation unit, is located outside the container 4.
  • the design as a compact device is of course not mandatory.
  • a metallic protective layer 35 is provided in the corresponding area of the elongate element 8. Comparable configurations have already become known in connection with a rod antenna from EP 0 834 722 A2. The key word for embodiments of this type is: 'inactive length'.
  • the measurement signals are guided within the elongate element 8 via a coaxial cable 9, the measurement signals are guided via a waveguide 12 in the embodiment shown in FIG. 2 Waveguides are used. Furthermore, the measurement signals can also be fed directly into the horn antenna 16 via a microstrip line arranged on a circuit board.
  • the elongate element 8 is also covered with a dielectric protective layer 36.
  • the elongate element 8 is made of a conductive material, in particular a metal.
  • the measuring device is therefore characterized by its high resistance to aggressive filling materials and vapors. If the elongate element 8 is made of a conductive material, the measurement signals are emitted or received via a dielectric window 13 provided in the metallic casing.
  • the antenna is not integrated into the elongate element 8, as shown in FIGS. 1 to 4. Rather, the measurement signals are emitted or received via a rod antenna 14 which is oriented in a first position, the assembly position, in the longitudinal direction of the elongated element 8 and which is rotated by 90 ° via the swivel mechanism 15 in a second position, the measurement position so that the measurement signals are now radiated in the desired direction onto the surface 3 of the filling material 2 or that the measurement signals reflected on the surface 3 of the filling material 2 are received by the rod antenna 14.
  • a rod antenna 14 which is oriented in a first position, the assembly position, in the longitudinal direction of the elongated element 8 and which is rotated by 90 ° via the swivel mechanism 15 in a second position, the measurement position so that the measurement signals are now radiated in the desired direction onto the surface 3 of the filling material 2 or that the measurement signals reflected on the surface 3 of the filling material 2 are received by the rod antenna 14.
  • FIG. 6 A variant of the device according to the invention is shown in FIG. 6:
  • a horn antenna 16 is arranged in the end region of a flexible waveguide 17.
  • the longitudinal axis of the horn antenna 16 virtually forms the continuation of the longitudinal axis of the elongate element 8 or the flexible waveguide 17.
  • the horn antenna 16 is pivoted by 90 °, so that the aperture of the horn antenna 16 is now aligned in the direction of the surface 3 of the filling material 2.
  • FIG. 7 Another possibility of designing the antenna 7 can be seen in FIG. 7.
  • a so-called Yagi antenna 18 is used here.
  • a slot waveguide antenna 19 is used in FIG. 8.
  • FIG. 9 shows an embodiment of the device 1 according to the invention with a separate transmitting antenna 20 and receiving antenna 21.
  • FIG. 10 A particularly advantageous embodiment of the device 1 according to the invention is shown in FIG. 10.
  • the elongated element 8 with an integrated antenna 7 is arranged in a protective tube 22 made of a dielectric material.
  • the protective tube 22 is fixedly mounted in the opening 6 via a flange 25.
  • this is positioned in the protective tube 22 and fastened to the connection piece via the flange 10.
  • an installation and removal z. B. for maintenance of the device 1 according to the invention if the filling 2 in the container 4 extends beyond the opening 6.
  • FIGS. 12 to 16 show embodiments of the device 1 according to the invention, in which an additional sensor for determining and / or monitoring the fill level is provided on the preferably elongate element 8.
  • the additional sensor is, for example, a conductive sensor 26 (FIG. 12), a capacitive sensor 28 (FIG. 13) or a vibration detector (FIG. 13).
  • a further sensor for continuous level measurement or level monitoring can be used, it can either be an ultrasonic sensor 32 (FIG. 15) or a second microwave sensor 31 (FIG. 16), which with measurement signals Measuring frequency f2 works, which is different from the measuring frequency f1 of the first microwave sensor 30.
  • FIG. 16 also shows the configuration of the device 1 according to the invention, in which the sensor 1 communicates with a remote control point 33 via a bus line 34.
  • any known transmission standard can be used for communication.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

L'invention concerne un dispositif destiné à déterminer le niveau de remplissage d'un matériau (2) dans un contenant au moyen d'une unité de production de signaux. Ledit dispositif est composé d'au moins une antenne (7) émettant les signaux de mesure en direction de la surface (3) du matériau (2), et recevant les signaux de mesure réfléchis par la surface (3) du matériau (2), et d'une unité de régulation et d'exploitation déterminant le niveau de remplissage du matériau (2) dans le contenant (4) sur la base de la durée de parcours des signaux de mesure. L'invention vise à mettre en oeuvre un dispositif (1) permettant de monter de manière simple et économique un appareil de niveaumétrie fonctionnant selon le principe de la durée de parcours, sur un contenant (4). A cet effet, une ouverture (6) est pratiquée dans la partie supérieure d'une paroi latérale (5) du contenant (4), et la ou les antennes (7) sont logées dans cette ouverture (6), l'antenne (7) étant logée ou conçue de manière que les signaux de mesure sont essentiellement émis dans la direction de la surface (3) du matériau (2), et que les signaux de mesure réfléchis par la surface (3) du matériau (2) sont reçus par la ou les antennes (7).
EP01967276A 2000-10-14 2001-08-16 Dispositif destine a determiner le niveau de remplissage d'un materiau dans un contenant Ceased EP1325351A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10051025A DE10051025A1 (de) 2000-10-14 2000-10-14 Vorrichtung zur Bestimmung des Füllstands eines Füllguts in einem Behälter
DE10051025 2000-10-14
PCT/EP2001/009425 WO2002033439A1 (fr) 2000-10-14 2001-08-16 Dispositif destine a determiner le niveau de remplissage d'un materiau dans un contenant

Publications (1)

Publication Number Publication Date
EP1325351A1 true EP1325351A1 (fr) 2003-07-09

Family

ID=7659828

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01967276A Ceased EP1325351A1 (fr) 2000-10-14 2001-08-16 Dispositif destine a determiner le niveau de remplissage d'un materiau dans un contenant

Country Status (4)

Country Link
EP (1) EP1325351A1 (fr)
AU (1) AU2001287687A1 (fr)
DE (1) DE10051025A1 (fr)
WO (1) WO2002033439A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10149851A1 (de) * 2001-10-10 2003-04-24 Endress & Hauser Gmbh & Co Kg Vorrichtung zur Bestimmung des Füllstandes eines Füllguts in einem Behälter
DE10240550A1 (de) * 2002-08-29 2004-03-18 Krohne S.A. Füllstandsmeßgerät
DE10360711A1 (de) 2003-12-19 2005-07-14 Endress + Hauser Gmbh + Co. Kg Füllstandsmeßgerät und Verfahren zur Füllstandsmessung und -überwachung
DE202009005513U1 (de) * 2009-04-11 2010-09-02 Sick Ag Vibrationsfüllstandsmessvorrichtung
DE102010038535A1 (de) 2010-07-28 2012-02-02 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Bestimmung und/oder Überwachung eines vorgegebenen Füllstands
DE102012104075A1 (de) 2012-05-09 2013-11-14 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Bestimmung und/oder Überwachung mindestens einer Prozessgröße eines Mediums
DE102012109101A1 (de) 2012-09-26 2014-03-27 Endress + Hauser Gmbh + Co. Kg Füllstandsmessgerät
HRP20221114T1 (hr) * 2015-03-27 2022-11-25 Vega Grieshaber Kg Radarski uređaj za mjerenje razine napunjenosti s integriranim senzorom granične razine
DE102015007698B4 (de) * 2015-06-18 2018-11-15 Baumer Electric Ag Sensorvorrichtung und Verfahren zur Distanzmessung mittels Ultraschall
DE202017106083U1 (de) * 2017-10-06 2019-01-17 Acs-Control-System Gmbh Pegelmessvorrichtung
EP3699558A1 (fr) * 2019-02-19 2020-08-26 VEGA Grieshaber KG Dispositif émetteur radar pourvu d'antenne intégrée
DE102019129274A1 (de) * 2019-10-30 2021-05-06 Vega Grieshaber Kg Messsystem zur Messung eines Füllstandes in einem Behälter sowie Verfahren zur Installation des Messsystems
DE102020106020A1 (de) 2020-03-05 2021-09-09 Endress+Hauser SE+Co. KG Füllstandsmessgerät
DE102021132553A1 (de) 2021-12-09 2023-06-15 Endress+Hauser SE+Co. KG Füllstandsmessgerät

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EP0449590A2 (fr) * 1990-03-30 1991-10-02 Nkk Corporation Appareil pour la mesure du niveau de la scorie dans un four
DE29923322U1 (de) * 1999-01-18 2000-07-13 Rattay Hans Vorrichtung zur Ermittlung des Füllstandes metallischer Flüssigkeiten

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US4146869A (en) * 1976-10-28 1979-03-27 Bindicator Company Ultrasonic antenna assembly
US4222267A (en) * 1978-02-10 1980-09-16 Keystone International, Inc. Material level detector circuit
LU80645A1 (fr) * 1978-12-12 1979-04-09 Wurth Anciens Ets Paul Dispositif de montage d'une sonde radar pour fours a cuve
DE4405855A1 (de) * 1994-02-23 1995-08-24 Grieshaber Vega Kg Antenneneinrichtung für ein Füllstandmeßgerät
US5611239A (en) * 1994-09-21 1997-03-18 Magnetrol International Inc. Microwave point instrument with self-test circuit
DE19641036C2 (de) 1996-10-04 1998-07-09 Endress Hauser Gmbh Co Mit Mikrowellen arbeitendes Füllstandsmeßgerät

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
EP0449590A2 (fr) * 1990-03-30 1991-10-02 Nkk Corporation Appareil pour la mesure du niveau de la scorie dans un four
DE29923322U1 (de) * 1999-01-18 2000-07-13 Rattay Hans Vorrichtung zur Ermittlung des Füllstandes metallischer Flüssigkeiten

Non-Patent Citations (1)

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Title
See also references of WO0233439A1 *

Also Published As

Publication number Publication date
DE10051025A1 (de) 2002-04-18
WO2002033439A1 (fr) 2002-04-25
AU2001287687A1 (en) 2002-04-29

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