EP1274973A2 - Dispositif de determination du niveau de remplissage d'un recipient avec un agent de remplissage - Google Patents

Dispositif de determination du niveau de remplissage d'un recipient avec un agent de remplissage

Info

Publication number
EP1274973A2
EP1274973A2 EP01931616A EP01931616A EP1274973A2 EP 1274973 A2 EP1274973 A2 EP 1274973A2 EP 01931616 A EP01931616 A EP 01931616A EP 01931616 A EP01931616 A EP 01931616A EP 1274973 A2 EP1274973 A2 EP 1274973A2
Authority
EP
European Patent Office
Prior art keywords
conductive element
coupling unit
container
interface
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
EP01931616A
Other languages
German (de)
English (en)
Inventor
Ralf Reimelt
Herbert Schroth
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 EP1274973A2 publication Critical patent/EP1274973A2/fr
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces

Definitions

  • the invention relates to a device for determining the filling level of a filling material in a container according to the preamble of the independent claims.
  • the device is also suitable for determining the position of at least one interface between two phases of a medium or between two media.
  • measuring systems are used which measure different physical quantities.
  • the desired information about the fill level is subsequently derived on the basis of these variables.
  • capacitive, conductive or hydrostatic measuring probes are used, as are detectors that work on the basis of ultrasound, microwaves or radioactive radiation.
  • sensors are increasingly being used here, in which short electromagnetic high-frequency pulses (TDR method or pulse radar method) or continuous frequency-modulated microwaves (e.g. FMCW radar method) are coupled into a conductive element or a waveguide and by means of the waveguide into the container in which the contents are stored.
  • TDR method or pulse radar method short electromagnetic high-frequency pulses
  • FMCW radar method continuous frequency-modulated microwaves
  • the known variants come as waveguides: surface waveguides according to Sommerfeld or Goubau or Lecher waveguides.
  • this measuring method takes advantage of the effect that at the interface between two different media, e.g. B. air and oil or air and water, due to the sudden change (discontinuity) of the dielectric constant of both media, a part of the guided high-frequency pulses or the guided microwaves reflected and the conductive Element is passed back into a receiving device.
  • the greater the difference in the dielectric constant of the two media the greater the reflected portion ( ⁇ useful echo signal).
  • the distance to the surface of the filling material can be determined on the basis of the transit time of the reflected portion of the high-frequency pulses or the CW signals (echo signals). If the empty distance of the container is known, the filling level of the filling material in the container can be calculated. If an interface determination is to be carried out, the position of the interface can be determined on the basis of the measurement results.
  • Sensors with guided high-frequency signals are distinguished from sensors that radiate high-frequency pulses or waves freely (free-field microwave systems (FMR) or 'real radar systems') by a significantly higher echo amplitude.
  • FMR free-field microwave systems
  • 'real radar systems' a significantly higher echo amplitude.
  • the reason for this is that the power flow takes place very deliberately along the waveguide or the conductive element.
  • the sensors with guided high-frequency signals have a higher measuring sensitivity and measuring accuracy in the close range than the freely radiating sensors.
  • Working surface or Lecher waveguide is considerably deteriorated if the transition area from the coupling unit to the conductive element is in the area of a container neck or - generally speaking - in the area of a structural part which is arranged in the container. If this is the case, there is a risk that the part of the radiation which is not directed towards the surface of the filling material, but rather is emitted to the side, leads to transverse resonances (in the case of a nozzle, to cavity resonances). In addition, the surface waves can cause longitudinal resonances to form on the conductive element. The false echo signals caused thereby can become so large that the actual useful echo signal can no longer be detected.
  • the container then forms an approach which can grow over time in such a way that the transmission of the surface waves is completely prevented or that at least interference echo signals are generated in the close range.
  • the invention is based on the object of proposing a device which is able to largely eliminate the influence that a structural part and / or attachment formation on the sensor has on the measuring accuracy and the measuring sensitivity of the sensor.
  • the object is achieved in that the coupling unit has at least a length which essentially corresponds to the distance from the container wall to the lower edge of the structural part and is positioned such that the transition region 'coupling unit - conductive element' approximately lies in the plane of the lower edge of the structural part and that the diameter of the opening of the coupling unit at the transition between the coupling unit and the conductive element is in the order of magnitude of the wavelength of the high-frequency measurement signals. Due to the extension of the coupling unit according to the invention, the structural parts lie outside the area into which electromagnetic energy is emitted. The generation of cavity resonances and interference signals is therefore largely prevented.
  • the opening or aperture of the coupling unit is of the same order of magnitude as the wavelength of the measurement signals. This ensures that the coupling unit has a pronounced directional characteristic and the measurement signals are largely coupled onto the conductive element and thus do not run back along the coupling unit in the opposite direction or are emitted laterally.
  • the object is achieved in that the coupling unit has a predetermined one Has length, and is positioned in the container so that the opening of the coupling unit pointing in the direction of the medium is a certain distance from the corresponding container wall, and that the diameter of the opening of the coupling unit at the transition 'coupling unit - conductive element' is of the order of magnitude
  • Wavelength of the high-frequency measurement signals is particularly advantageous if there are no structural parts in the vicinity of the coupling unit, which can have a negative effect on the propagation of the measurement signals, but if there is an increased risk that deposits will form on the coupling unit due to condensation and dust formation inside the container ,
  • the extended coupling shifts the transition area between the coupling unit and the conductive element to a location further in the interior of the container, which experience has shown is less susceptible to formation of deposits.
  • the coupling unit has an inner conductor and an outer conductor and that a dielectric material is arranged between the inner conductor and the outer conductor at least in a partial area. Since the field symmetry in the coaxial cable is very similar to the field symmetry on a Sommerfeld or Goubau conductor, only minor field disturbances occur in the transition area 'coupling unit - conductive element', which is reflected in a high transmission rate and thus a high measuring sensitivity. Due to the low proportion of reflected measurement signals, the interference in the close range is also small, since multiple reflections between locally extended interference points are avoided.
  • the fault points are, for example, plugs on the electronics, on the one hand, and the transition area 'coupling unit - conductive element', on the other hand. Further advantages of this configuration can be seen in the fact that the dielectric material seals the level sensor from the container and that it serves for the mechanical holding of the inner conductor. If there is no fear of condensate forming in the cavities of the coupling, the space area between the inner conductor and outer conductor can be completely filled with dielectric material for cost reasons. It has also proven to be particularly advantageous if the dielectric material of the coupling unit is tapered essentially from the transition region 'coupling unit - conductive element', an upper section of the conductive element being arranged approximately in the region of the longitudinal axis of the taper. The tapered shape of the dielectric material has several advantages:
  • the tapered shape changes the phase front at the transition 'coupling unit - conductive element' so that there is an improved directivity. On the one hand, this reduces the undesired radiation to the side and to the rear, while on the other hand the
  • Coupling to the waveguide is improved. Because of the advantage mentioned first, the occurrence of false echoes and the so-called bell ringing is reduced, while due to the advantage mentioned second, an increase in the amplitude of the useful echo signal is achieved.
  • the tapered shape means that signal components reflected at different locations on the taper interfere destructively, which leads to a reduction in the block distance. Block distance is the minimum measurable distance of a level sensor. 3.
  • the taped shape facilitates the drainage of condensate droplets; this reduces the risk of build-up.
  • the horn reduces the field distortion in the transition area 'coupling unit - conductive element', since the outer conductor does not drop abruptly, but continuously increases in diameter. Ideally, the diameter is so large that the surface wave mode is already detaches from the outer conductor. This results in low field disturbances in the transition area 'coupling unit - conductive element'. 3. Condensate can run off on the outside of the horn, so that the cross-section in which the signal is routed is not closed off by attachment.
  • the object is achieved in that the transition region 'coupling unit - conductive element' lies essentially in the plane of the container wall, that the coupling unit has an inner conductor and an outer conductor, that at least in between the inner conductor and the outer conductor A partial area is arranged a dielectric material and that the dielectric material of the coupling unit is tapered essentially from the transition area 'coupling unit - conductive element', an upper portion of the conductive element being arranged approximately in the region of the longitudinal axis of the taper.
  • the diameter of the aperture of the coupling unit is preferably in the order of magnitude of the wavelength of the measurement signals.
  • the object is achieved in that the transition region 'coupling unit - conductive element' lies essentially in the plane of the container wall, that the coupling unit has an inner conductor and an outer conductor, that between the inner conductor and the outer conductor at least in one A portion of a dielectric material is arranged and that the outer conductor of the coupling unit essentially changes into a horn-shaped element from the transition "coupling unit - conductive element", an upper section of the conductive element being arranged approximately in the region of the longitudinal axis of the horn.
  • the diameter of the aperture of the coupling unit is preferably in the order of magnitude of the wavelength of the measurement signals.
  • a preferred embodiment of the two aforementioned variants of the device according to the invention provides that the transition area 'coupling unit - conductive element' is positioned essentially in the plane of the top of a structural part provided on the container, in particular a nozzle.
  • the object is achieved in that a conductive material is arranged in the region of the side walls of the structural part and in the region of the underside of the structural part, and in that the transition region
  • a cup-shaped insert part can be inserted into the connecting piece, the insert part being coated on at least one side with a conductive material or the insert part being made from a conductive material.
  • an opening for receiving the fill level sensor is provided on the underside of the insert part. This enables the same measuring device to be used for different installation situations. You only have to match the pot to the dimensions of the nozzle.
  • an embodiment of the device according to the invention provides a cover part which closes the top of the connecting piece or the insert part. This protects the electronics of the measuring device, since no dirt or z. B. can accumulate water. In addition, it becomes possible to mount the level sensor so that the display and / or operating elements of the sensor remain accessible even with narrow nozzles.
  • the object is achieved in that the coupling unit has a length which essentially corresponds to the distance from the container wall to the lower edge of the structural part, that the coupling unit is positioned such that the transition region 'coupling unit - conductive element 'is approximately in the plane of the lower edge of the structural part, and that on the underside of the nozzle in the transition area' coupling unit - conductive element 'a plate-shaped element is arranged which is electrically conductive at least on the side facing the medium in the container.
  • This variant of the invention can be classified as particularly inexpensive.
  • An advantageous development of the device according to the invention provides, in connection with the variant described above, electrical connecting elements which are arranged in the region between the outer edges of the plate-shaped element and the connecting piece.
  • the preferably resilient contact elements ensure an HF-tight seal between the plate and the socket.
  • the object is achieved in that the transition region 'coupling unit - conductive element' is arranged in the plane in which the upper edge of the structural part lies, that the conductive element approximately over the length of the structural part or over the Length, which corresponds to the distance between the corresponding container wall and the lower edge of the structural part, is modified such that in this area there are almost no interactions between the measurement signals carried on the conductive element and the structural part.
  • the conductive element over the length of the structural part or over the length that corresponds to the distance between the corresponding container wall and the lower edge of the structural part, made of a material with low electrical conductivity and / or large magnetic Permeability is made.
  • Construction part corresponds, has a roughened surface structure.
  • the surface of the conductive element has a surface structure over the length of the structural part or over the length that corresponds to the distance between the corresponding container wall and the lower edge of the structural part, by means of which the longitudinal inductance of the conductive element is increased ,
  • An example of this is a helical surface structure.
  • the conductive element bears an insulating layer, the magnetic and / or dielectric, over the length of the structural part or over the length which corresponds to the distance between the corresponding container wall and the lower edge of the structural part Properties are dimensioned in such a way that the expansion of the electromagnetic fields of the measurement signals is essentially limited to the vicinity of the conductive element.
  • the above-mentioned configurations are distinguished by the fact that the field expansion is specifically reduced in the areas in which there is a risk of undesired interaction with internals, but not over the remaining length of the conductive element. Here would be a minor one
  • the object is achieved in that the transition region 'coupling unit - conductive element' is arranged in the plane of the container wall, that the conductive element, at least in the upper region, is made of a material with low electrical conductivity and / or large magnetic Permeability is made, and / or that the conductive element has a roughened surface structure at least in the upper region, and / or that the conductive element has at least in the upper region a surface structure by which the longitudinal inductance of the conductive element is increased, and / or that conductive element carries at least in the upper region an insulating layer, the magnetic and / or dielectric properties of which are dimensioned such that the electromagnetic fields of the measurement signals are limited to the vicinity of the conductive element.
  • FIG. 5 a schematic representation of an advantageous embodiment of the embodiment of the device according to the invention shown in FIG. 3,
  • FIG. 6 a schematic representation of an advantageous embodiment of the embodiment of the device according to the invention shown in FIG. 4,
  • FIG. 8 a schematic representation of an advantageous embodiment of the embodiment of the device according to the invention shown in FIG. 7,
  • FIG. 11 a schematic representation of an eighth embodiment of the device according to the invention and Fig. 12: a schematic representation of a preferred embodiment of the conductive element.
  • the fill level sensor 1 shows a schematic representation of a first embodiment of the fill level sensor 1 according to the invention.
  • the fill level sensor 1 consists of a transmitter / receiver unit 29, a coax cable, a coupling unit 2 and a conductive element 7.
  • the echo signals are evaluated in a manner shown in FIG. 1 evaluation unit not shown separately.
  • the coupling unit 2 has a length that is greater than the length of the connector 4.
  • the coupling unit 2 is arranged in such a way that the opening 8 is arranged in the vicinity - here: below - the lower edge 5 of the connector 4.
  • the opening 8 can also lie above the lower edge 5.
  • the opening 8 of the coupling unit 2 is dimensioned such that it lies in the order of magnitude of the wavelength of the measurement signals carried by the level sensor 1.
  • the space between the inner conductor 9 and the outer conductor 10 is further filled with a dielectric material 11.
  • the dielectric material 11 is tapered from the transition region 6 'coupling unit 2 - conductive element 7'.
  • the taper 12 can of course have a wide variety of configurations.
  • 2 shows a schematic representation of a second embodiment of the device according to the invention, which differs from the embodiment shown in FIG. 1 essentially only in that it is not arranged in a connecting piece 4, but rather directly on the container wall 3.
  • the advantages of this embodiment according to the invention have also already been explained in detail at the previous point.
  • FIG. 3 A schematic representation of a third embodiment of the device according to the invention can be seen in FIG. 3.
  • the transition region 6 'coupling unit 2 - conductive element 7' is arranged so that it lies almost in the plane of the container wall 3.
  • the coupling unit 2 has an inner conductor 9 and an outer conductor 10.
  • a dielectric material 11 is arranged between the two parts.
  • the dielectric material 11 of the coupling unit 2 is tapered approximately from the transition region 6 'coupling unit 2 - conductive element 7', an upper section of the conductive element 7 being arranged approximately in the region of the longitudinal axis of the taper 12.
  • the main advantages of this configuration are the excellent directivity, the small block distance and the reduced risk of build-up.
  • the outer conductor 13 is widened from the transition region 6 ′ coupling unit 2 - conductive element 7 ′ to a horn-shaped element 13.
  • FIG. 4 shows a schematic illustration of a fourth embodiment of the device according to the invention.
  • the transition area 6 'coupling unit 2 - conductive element 7' is arranged so that it lies almost in the plane of the container wall 3.
  • the coupling unit 2 consists of an inner conductor 9 and an outer conductor 10, a dielectric material 13 being found between the inner conductor 9 and the outer conductor 10.
  • the dielectric material 11 it is not necessary for the dielectric material 11 to fill the entire space between the inner conductor 9 and the outer conductor 10.
  • the outer conductor 10 of the coupling unit 2 is widened approximately from that of the transition region 6 'coupling unit 2 - conductive element 7' in such a way that it forms a horn-shaped element 13.
  • An upper section of the conductive element 7 is arranged approximately in the region of the longitudinal axis of the horn-shaped element 13. Since the advantages of this configuration have already been described in detail at the previous point, it is sufficient here to list them in key words: improved directivity, reduced field distortion at the transition area 6 'coupling unit 2 - conductive element 7' and thus an increased transmission rate, strongly reduced risk of build-up.
  • the embodiments shown in FIGS. 5 and 6 correspond to those of FIGS. 3 and 4, however, the level sensors 1 are arranged here in the nozzle 4 of a container 3.
  • the metal plate improves the electrical adaptation of the conductive element 7 and prevents electromagnetic energy from being radiated to the rear.
  • the metal plate acts almost as an electrical mirror.
  • 7 shows a schematic representation of a fifth embodiment of the device according to the invention.
  • a nozzle 4 is provided in the container wall 3.
  • a conductive material 20 is arranged on the side walls 17, 18 and in the region of the underside 19 of the connector 4. It is preferably a pot-shaped insert element 21 which is adapted to the dimensions of the socket 4.
  • the coupling unit 2 is positioned in the connection piece 4 such that the transition region 6 'coupling unit 2 - conductive element 7' comes to lie essentially in the plane of the container wall 3.
  • FIG. 8 shows a schematic illustration of an advantageous embodiment of the embodiment of the device according to the invention shown in FIG. 7. It differs from the variant shown in FIG. 7 essentially only by the cover part 23, which closes the cup-shaped insert part 21 arranged in the socket 4 to the outside. This configuration will always be used if the TDR sensor 1 is to be protected from environmental influences on the one hand, but its operating and display elements are to remain easily accessible on the other hand.
  • 9 shows a schematic representation of a sixth embodiment of the device according to the invention, which is characterized by low production costs.
  • the coupling unit 2 has a length which essentially corresponds to the length of the connector 4.
  • the coupling unit 2 is positioned such that the transition region 6 'coupling unit 2 - conductive element 7' lies approximately in the plane of the lower edge 5 of the connector 4.
  • connecting elements 25 made of an electrically conductive material are provided in the area of the outer edges 26 of the plate-shaped element 24, connecting elements 25 made of an electrically conductive material are provided.
  • connection or contact elements 25 are preferably resilient. They ensure an HF-tight seal between the plate-shaped element 24 and the nozzle 4, the side walls 17, 18 of which are either made of an electrically conductive
  • Material are made or are at least clad with an electrically conductive material. As already mentioned several times, this reduces the risk that part of the energy of the transmitted signals gets back into the nozzle.
  • FIG. 10 shows a schematic representation of a seventh embodiment of the device according to the invention.
  • the transition region 6 'coupling unit 2 - conductive element 7' is arranged in the plane in which the top 16 of the connector 4 lies.
  • the conductive element 7 is approximately modified over the length of the connecting piece 4 (or generally speaking: over the length which corresponds to the distance between the corresponding container wall 3 and the lower edge 5 of the respective construction or installation part) in such a way that in this area there are almost no interactions between the measurement signals carried on the conductive element 7 and the nozzle 4 (or generally speaking: the structural part).
  • the solution shown in FIG. 11 differs from the embodiment shown in FIG. 10 only in that it is not fastened in the area of a connecting piece 4. There are a variety of ways in which the goal can be achieved - taken individually or in combination with at least one other variant:
  • the conductive element 7 is at least in the upper region made of a material with a low electrical conductivity and / or a large magnetic one
  • the conductive element 7 has a roughened at least in the upper region
  • the conductive element 7 has a surface structure, at least in the upper region, through which the longitudinal inductance of the conductive element is increased; 10 and 11, the conductive element 7 carries, at least in the upper region, an insulating layer 28, the magnetic and / or dielectric properties of which are dimensioned such that the extension of the electromagnetic fields to the vicinity of the conductive element 7 is limited.
  • FIG. 12 shows a schematic illustration of a preferred embodiment of the conductive element 7.
  • the conductive element 7 is made of a highly permeable material, which causes a small field expansion of the surface wave carried on the conductive element 7.
  • the surface of the conductive element 7 is not smooth, but shows a roughened structure, which also contributes to a considerable field reduction. If you design the surface of the conductive element 7 z. B. helical, an increase in the longitudinal inductance is achieved. The wave resistance is increased and the field expansion is reduced.
  • the conductive element carries, at least in the area that adjoins the coupling unit, an insulating layer 29 which has coordinated magnetic and dielectric properties such that the field expansion of the measurement signals carried on the conductive element 7 is also reduced to the desired level.
  • an insulating layer 29 which has coordinated magnetic and dielectric properties such that the field expansion of the measurement signals carried on the conductive element 7 is also reduced to the desired level.
  • Construction part e.g. B. socks

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

La présente invention concerne un capteur de niveau de remplissage (1). L'invention a pour objet la mise en place d'un capteur de niveau de remplissage (1) permettant d'éliminer dans une large mesure l'influence qu'ont les éléments structuraux (4) et/ou la formation de dépôts sur la précision de mesure et sur la sensibilité de mesure du capteur de niveau de remplissage (1). Pour cela, l'unité de couplage (2) présente au moins une longueur qui correspond principalement à la distance entre la paroi de récipient (3) et l'arête inférieure (5) de l'élément structurel (4), et qui est positionnée de sorte que la zone de transition "unité de couplage élément conducteur" (6) se trouve approximativement dans le plan de l'arête inférieure (5) de l'élément structurel (4), et que le diamètre de l'ouverture (8) de l'unité de couplage (2) au niveau de la transition "unité de couplage élément conducteur" (6) est de l'ordre de grandeur de la longueur d'onde des signaux de mesure haute fréquence.
EP01931616A 2000-04-18 2001-04-18 Dispositif de determination du niveau de remplissage d'un recipient avec un agent de remplissage Ceased EP1274973A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10019129 2000-04-18
DE10019129A DE10019129A1 (de) 2000-04-18 2000-04-18 Vorrichtung zur Bestimmung des Füllstandes eines Füllguts in einem Behälter
PCT/EP2001/004385 WO2001079788A2 (fr) 2000-04-18 2001-04-18 Dispositif de determination du niveau de remplissage d'un recipient avec un agent de remplissage

Publications (1)

Publication Number Publication Date
EP1274973A2 true EP1274973A2 (fr) 2003-01-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP01931616A Ceased EP1274973A2 (fr) 2000-04-18 2001-04-18 Dispositif de determination du niveau de remplissage d'un recipient avec un agent de remplissage

Country Status (5)

Country Link
US (1) US6847214B2 (fr)
EP (1) EP1274973A2 (fr)
AU (1) AU2001258345A1 (fr)
DE (1) DE10019129A1 (fr)
WO (1) WO2001079788A2 (fr)

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DE102004034251A1 (de) * 2004-07-14 2006-02-09 Vega Grieshaber Kg Füllstands-Messvorrichtung mit einem Wellenreiter und einem Wellenanpasser
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US9518856B2 (en) * 2014-03-28 2016-12-13 Honeywell International Inc. Threaded coupling device with nozzle for GWR measurements in non-metallic tanks
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US9970806B2 (en) * 2015-04-30 2018-05-15 Rosemount Tank Radar Ab Single conductor probe radar level gauge system and method for a tank having a tubular mounting structure
DE102016103430B4 (de) * 2016-02-26 2021-08-19 Finetek Co., Ltd. Zeitbereichs-Reflektometrie-Wellenleiterstruktur
US10403953B2 (en) 2016-12-22 2019-09-03 Rosemount Tank Radar Ab Tank with a guided wave radar level gauge
CN113811746A (zh) * 2019-07-30 2021-12-17 Vega格里沙贝两合公司 用于检测容器中的过程变量的测量设备

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AU2001258345A1 (en) 2001-10-30
US20040017200A1 (en) 2004-01-29
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DE10019129A1 (de) 2001-10-25
WO2001079788A3 (fr) 2002-05-23

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