WO2002068913A2 - Vorrichtung zur bestimmung und/oder überwachung des füllstands eines füllguts in einem behälter - Google Patents
Vorrichtung zur bestimmung und/oder überwachung des füllstands eines füllguts in einem behälter Download PDFInfo
- Publication number
- WO2002068913A2 WO2002068913A2 PCT/EP2001/014790 EP0114790W WO02068913A2 WO 2002068913 A2 WO2002068913 A2 WO 2002068913A2 EP 0114790 W EP0114790 W EP 0114790W WO 02068913 A2 WO02068913 A2 WO 02068913A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- homiform
- measurement signals
- container
- lower opening
- filling material
- Prior art date
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
- G01F23/28—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
Definitions
- the invention relates to a device for determining and / or monitoring the filling level of a filling material in a container.
- the measuring devices of the aforementioned type are usually attached to the container by means of a screw thread or or a flange. When installing, make sure that the measuring device is placed above the maximum level to be measured.
- the coupling of the measurement signals from the transmitting unit to the conductive element or from the conductive element into the receiving unit takes place via a coupling unit which is designed in such a way that the interference echo signals occurring in transition areas as a result of impedance jumps are kept as low as possible.
- the coupling unit has a relatively small opening area; due to the small opening area, an impedance jump occurs on the one hand, which leads to an undesired reflection when the measurement signal is emitted; on the other hand, the electrical field is distorted due to the small opening area, so that in addition to the excitation of the desired wave mode, which has a pronounced radiation characteristic in the direction of the filling material, modes are also generated which have an undesired lateral radiation.
- the funnel-shaped element should ensure that the guidance of the measurement signals in the direction of the surface of the filling material is optimized.
- the radiation is only optimized if the wavelength of the measurement signals is small in relation to the diameter of the lower opening area of the homiform element. If the wavelength is in the order of magnitude of the diameter of the homiform element, there is no pronounced directional characteristic in the running direction of the measurement signals. Rather, some of the energy runs back on the outer surface of the homiform element, is reflected on the coupling unit, on the container wall, the flange or another obstacle, which causes relatively strong false echoes. In a large number of applications, the measurement results are therefore even worse by attaching the homiform element.
- the invention has for its object to optimize the coupling of measurement signals in a level measuring device with guided measurement signals.
- a transmitter / receiver unit which generates or receives high-frequency measurement signals and that an evaluation / control unit is provided which determines the fill level of the filling material in the container on the basis of the transit time of the high-frequency measurement signals.
- a conductive element is provided, on which the high-frequency measurement signals or the reflected measurement signals are guided.
- the measuring signals are coupled onto the conductive element or the reflected measuring signals into the transmitting / receiving unit via a coupling unit.
- the device is attached by means of a fastening part above the maximum fill level to be measured and / or monitored.
- a homiform element is provided in the upper region of the conductive element, which element is arranged in such a way that its lower opening surface pointing towards the surface of the filling material lies approximately in the plane of the fastening part.
- the lower opening area of the homiform element has an enlarged opening area compared to a conventional coupling. This increases the proportion of high-frequency energy which is transformed into the desired waveguide mode or subsequently transformed back again. As a result, the amplitude of the useful signal - that is, the echo signal, which represents the filling level of the filling material in the container - is increased.
- the horn-shaped element does not hinder the material flow through the lateral outlet.
- the upper opening area of the homiform element is smaller than the lower opening area. This is achieved, for example, in that the side walls of the homiform element increase continuously (exponentially, conically, etc.) or step-like from the plane of the upper opening surface to the lower opening surface.
- the angle of inclination can have any angle in the range greater than zero degrees and less than or equal to 90 degrees.
- a preferred development of the device according to the invention provides that the flange itself is turned out and has a quasi horn-shaped structure on the container side. Since the flange also takes on the task of the homiform element, material and costs can be saved in this way.
- an advantageous embodiment of the device according to the invention provides that the side walls of the homiform element have a smooth or a structured inner surface. In this way, the formation of the desired modes can be forced.
- the fastening element is designed as a plate.
- the plate has an opening, the area of which approximately corresponds to the lower opening area of the homiform element.
- the plate can be z. B. the upper surface of a container neck, the upper surface of the container or a flange, via which the device can be attached to the container.
- the lower edge of the homiform element can be fastened to the plate or the fastening element by means of a welded, soldered, riveted, screwed or adhesive connection.
- the lower edge of the homiform element can be complementarily beveled or designed when the assembly is carried out, for. B. to be done on an oblique fuel cap.
- an external or internal thread can be attached in the area of the horn edge.
- the thread is then screwed, for example, into or onto a sleeve.
- a flange can be provided on the horn edge so that the horn can be screwed directly onto the container or onto a nozzle, a bypass or a still pipe.
- the direct screwing onto the container is useful, for example, in the case of plastic containers since, among other things, with such a connection the tensile forces are also transmitted to a relatively large area of the container.
- a particularly preferred embodiment of the device according to the invention proposes that the flange and the homiform element are designed as an integral unit.
- the horn-shaped element can also be connected to a sheet which is subsequently clamped between two flanges for fastening to the container.
- the device is at least partially modular.
- an advantageous embodiment of the device according to the invention proposes that the device can be fastened to a still pipe, to a bypass or to a nozzle.
- the lower dimensions of the opening area of the homiform element then approximately correspond to the dimensions of the opening area of the still pipe or the bypass or the nozzle. This effectively prevents false echoes, but at least limits them to a tolerable level.
- the dimensions of the opening area are standardized and the adaptation to the respective sound tube or the respective bypass via z. B. flanges of different dimensions.
- a development of the device according to the invention proposes to at least partially fill the interior of the homiform element with a dielectric material.
- the dielectric material is taped in the direction of the filling material, that is to say on the filling material side.
- Fig. 5 a third embodiment of the attachment between the horn-shaped element and the container
- Fig. 6 a fourth embodiment of the attachment between the horn-shaped element and the container.
- the high-frequency measurement signals are generated in the transmission unit 9 and are coupled in at certain intervals specified by the control / evaluation unit 11 via the coupling unit 8 onto the conductive element 6 and in the direction of the filling material 2 guided.
- the measurement signals are reflected on the surface 4 of the filling material and reach the receiving unit 10 via the coupling unit 8.
- the control / evaluation unit 11 determines the filling level of the filling material 2 on the basis of the transit time of the measurement signals that are reflected on the surface 4 of the filling material 2 in the container 3.
- a corresponding measuring device and a method by means of which the fill level can be determined have become known, for example, from EP 1 020 735 A2.
- the device 1, ie the TDR measuring device, is fastened in an opening 25 in the lid 5 of the container 3. It goes without saying that instead of the cover 5 of the container 3, the fastening of the measuring device 1 also in the area of the upper one External surface of a nozzle can be made.
- the high-frequency measurement signals are conducted to the conductive element 6 via a homiform element 7.
- the lower opening surface 15 pointing in the direction of the surface 4 of the filling material 2 lies approximately in the plane of the preferably plate-shaped fastening part, here the cover 5.
- the upper opening area 14 of the homiform element 7 is smaller than the lower opening area 15. This is achieved, for example, in that the side walls of the homiform element 7 are continuous, that is, for example, exponential or conical, or Increase in steps from the level of the upper opening area 14 to the lower opening area 15.
- the preferred embodiment of the device according to the invention is shown in FIG. 1, according to which the side walls of the homiform element 7 have a smooth or a structured inner surface. In this way, the spread of preferred modes can be forced.
- the horn-shaped element 7 can be completely or partially filled with a dielectric material 22 (see FIG. 4).
- the dielectric material 22 prevents the homiform element 7 from becoming clogged with filling material 2.
- the device 1 according to the invention shown in FIG. 1 can have a Fresnel lens which closes the lower opening surface 15 of the homiform element 7. This solution shown in FIG. 3 is useful if no large pressure differences between the inner and outer surface of the dielectric plate 21 are to be expected.
- the diameter of the lower opening surface 15 when using measurement signals in the frequency range between 300 MHz and 1.5 GHz (this range includes, for example, the frequencies of the measurement signals that are used in a fill level measuring device that the Is marketed under the name Levelflex) 100 mm; then a length of the homiform element 7 of approximately 150 mm is optimal.
- Fig. 2 shows a schematic representation of an embodiment of the device 1 according to the invention.
- the measuring device is fastened here in the upper region of a bypass 12, the dimensions of the homogeneous element 7 being matched such that the lower opening surface 15 of the homogeneous element 7 essentially corresponds to the Opening area of the bypass 12 matches.
- the impedance can be kept almost constant; there are practically no reflections in the area of the coupling.
- a fill level measurement can therefore be carried out virtually up to the lower opening surface 15 of the homiform element 7, which is why it is possible for the first time to use a measuring device which determines the fill level over the transit time of guided measurement signals as overfill protection.
- the lower opening surface 15 of the homiform element 7 can thus be adapted to a specific nozzle, bypass or surge pipe diameter in order to achieve the highest possible efficiency.
- the measuring device can be mounted on a bypass 12, on a connecting piece or on a still pipe.
- stillpipes are preferred when high-precision, verifiable measurements have to be carried out.
- FIGS. 3, 4, 5 and 6 show different configurations of the fixation between a homiform element 7 and a fastening part.
- the horn-shaped element 7 can be seen as a separate part.
- the horn-shaped element 7 has an internal thread 13 for mounting the coupling unit 8.
- the horn-shaped element 7 can also be an integral part of the coupling unit 8. 3, by the way, the conductive element 6 is decentered, that is to say not arranged in the direction of the axis of symmetry of the homiform element 7.
- the decentralized arrangement of the conductive element 6 is in no way limited to the arrangement according to the invention, in particular thus to the arrangement of the homiform element 7 relative to the fastening part 5. Rather, the decentralized arrangement also proves to be advantageous if no homiform element 7 is used at all or if the horn-shaped element 7, as is known from the prior art, projects into the container 3 in which the level measurement is carried out ,
- surface structures 26 are provided on the inner surface 24 of the side wall 23 of the homiform element 7, which favor the propagation of preferred modes of the high-frequency measurement signals.
- the lower opening surface 15 of the homiform element 7 is closed by a dielectric plate 21.
- the dielectric plate 21 is, for example, a Fresnel lens.
- the horn-shaped element 7 is an integral part of a flange 16.
- this makes it possible to optimally match the horn-shaped element 7 and the coupling to the high-frequency measurement signals used and then to fix the device 1 to the desired fastening part 5 via the flange 16 of any size.
- the device 1 proposes to at least partially fill the interior of the homiform element 7 with a dielectric material 22.
- the dielectric material 22 is taped in the direction of the filling material 2, that is to say on the filling material side.
- FIG. 5 shows a variant in which the connection between the homiform element 7 and the fastening part 5 takes place via a screw connection.
- an internal thread 19 is provided in the region of the lower edge of the homiform element 7, which with a corresponding part, for. B. a sleeve, which is provided on the fastening part 5, is connected.
- FIG. 6 shows an embodiment in which the connection between the homiform element 7 and the fastening part 5 also takes place via a screw connection - however, an external thread 20 is arranged here in the region of the lower edge of the homiform element 7.
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
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/469,161 US6928867B2 (en) | 2001-02-27 | 2001-12-14 | Device for determining and/or monitoring the level of a filled substance in a container |
EP01273821A EP1402234A2 (de) | 2001-02-27 | 2001-12-14 | Vorrichtung zur bestimmung und/oder überwachung des füllstands eines füllguts in einem behälter |
AU2002219187A AU2002219187A1 (en) | 2001-02-27 | 2001-12-14 | Device for determining and/or monitoring the level of a filled substance in a container |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10109453A DE10109453A1 (de) | 2001-02-27 | 2001-02-27 | Vorrichtung zur Bestimmung und/oder Überwachung des Füllstands eines Füllguts in einem Behälter |
DE10109453.1 | 2001-02-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002068913A2 true WO2002068913A2 (de) | 2002-09-06 |
WO2002068913A3 WO2002068913A3 (de) | 2004-01-08 |
Family
ID=7675682
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/014790 WO2002068913A2 (de) | 2001-02-27 | 2001-12-14 | Vorrichtung zur bestimmung und/oder überwachung des füllstands eines füllguts in einem behälter |
Country Status (5)
Country | Link |
---|---|
US (1) | US6928867B2 (de) |
EP (1) | EP1402234A2 (de) |
AU (1) | AU2002219187A1 (de) |
DE (1) | DE10109453A1 (de) |
WO (1) | WO2002068913A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008037302A1 (en) * | 2006-09-29 | 2008-04-03 | Vega Grieshaber Kg | Silo contents measurements system |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004022516B4 (de) * | 2004-05-05 | 2017-01-19 | Endress + Hauser Gmbh + Co. Kg | Hornantenne |
US7592946B2 (en) * | 2005-02-14 | 2009-09-22 | Endress + Hauser Gmbh + Co. Kg | Level measurement arrangement |
US7819144B2 (en) * | 2005-09-01 | 2010-10-26 | Wotring Blake R | Method and apparatus for loading and conditioning materials |
DE102005042646A1 (de) * | 2005-09-07 | 2007-03-08 | Endress + Hauser Gmbh + Co. Kg | Vorrichtung zur Ermittlung und Überwachung des Füllstandes eines Mediums in einem Behälter |
NL1030317C2 (nl) * | 2005-10-31 | 2007-05-03 | Enraf Bv | Inrichting voor het met behulp van een radarantenne vaststellen van het niveau van een vloeistof, alsmede een dergelijke radarantenne. |
DE102006030965A1 (de) * | 2006-07-03 | 2008-01-10 | Endress + Hauser Gmbh + Co. Kg | Vorrichtung zur Ermittlung und/oder Überwachung des Füllstandes eines Mediums |
DE102007005619A1 (de) * | 2007-01-31 | 2008-08-07 | Krohne S.A. | Füllstandsmeßvorrichtung |
US20090085794A1 (en) * | 2007-09-28 | 2009-04-02 | Rosemount Tank Radar Ab | Radar level gauge system |
US8069722B1 (en) * | 2008-06-09 | 2011-12-06 | L&J Engineering, Inc. | Tank gage hatch assembly |
CA2649197A1 (en) * | 2008-12-24 | 2010-06-24 | Gasfrac Energy Services Inc. | Proppant control in an lpg frac system |
US8797207B2 (en) * | 2011-04-18 | 2014-08-05 | Vega Grieshaber Kg | Filling level measuring device antenna cover |
US9404787B2 (en) * | 2014-02-26 | 2016-08-02 | Finetek Co., Ltd. | Level measuring device with an integratable lens antenna |
EP3748312B1 (de) * | 2019-06-07 | 2022-06-01 | VEGA Grieshaber KG | Messgerät mit flansch und behälter mit diesem messgerät |
Citations (4)
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US3995212A (en) * | 1975-04-14 | 1976-11-30 | Sperry Rand Corporation | Apparatus and method for sensing a liquid with a single wire transmission line |
EP0534654A2 (de) * | 1991-09-26 | 1993-03-31 | Solartron Group Limited | Wasserstandsmessung mit Hochfrequenzwellen |
US5438867A (en) * | 1992-10-05 | 1995-08-08 | Krohne Messtechnik Gmbh & Co. Kg. | Process for measuring the level of fluid in a tank according to the radar principle |
DE4404745A1 (de) * | 1994-02-15 | 1995-08-17 | Grieshaber Vega Kg | Füllstandsmeßvorrichtung und deren Verwendung |
Family Cites Families (11)
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SE441306B (sv) * | 1984-04-25 | 1985-09-23 | Saab Marine Electronics | Sett och anordning for metning av nivan hos ett i en behallare forvarat flytande material |
US4566321A (en) * | 1985-01-18 | 1986-01-28 | Transamerica Delaval Inc. | Microwave tank-contents level measuring assembly with lens-obturated wall-opening |
DE4241910C2 (de) * | 1992-12-11 | 1996-08-01 | Endress Hauser Gmbh Co | Mit Mikrowellen arbeitendes Füllstandsmeßgerät |
DE4336494C2 (de) * | 1993-10-26 | 1995-11-02 | Endress Hauser Gmbh Co | Vorrichtung zur Füllstandsmessung in Behältern |
DE4407823C2 (de) * | 1994-03-09 | 1997-12-11 | Grieshaber Vega Kg | Füllstandmeßgerät |
SE9702235L (sv) * | 1997-06-11 | 1998-06-22 | Saab Marine Electronics | Hornantenn |
DE59813795D1 (de) * | 1998-05-06 | 2006-12-21 | Endress & Hauser Gmbh & Co Kg | Verfahren zur Messung des Füllstands eines Füllguts in einem Behälter nach dem Radarprinzip |
US6229476B1 (en) * | 1998-11-27 | 2001-05-08 | Endress+ Hauser Gmbh+ Co. | Liquid level meter |
US6452467B1 (en) * | 1999-04-01 | 2002-09-17 | Mcewan Technologies, Llc | Material level sensor having a wire-horn launcher |
US6681626B2 (en) * | 2000-09-18 | 2004-01-27 | Vega Grieshaber Kg | Level metering device working on the guided microwave principle, comprising a single-wire line and specific connection piece, and connection piece for a level metering device of this type |
US6677891B2 (en) * | 2001-01-19 | 2004-01-13 | Vega Grieshaber Kg | Method and device for transmitting and receiving electromagnetic waves |
-
2001
- 2001-02-27 DE DE10109453A patent/DE10109453A1/de not_active Withdrawn
- 2001-12-14 WO PCT/EP2001/014790 patent/WO2002068913A2/de not_active Application Discontinuation
- 2001-12-14 AU AU2002219187A patent/AU2002219187A1/en not_active Abandoned
- 2001-12-14 EP EP01273821A patent/EP1402234A2/de not_active Withdrawn
- 2001-12-14 US US10/469,161 patent/US6928867B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3995212A (en) * | 1975-04-14 | 1976-11-30 | Sperry Rand Corporation | Apparatus and method for sensing a liquid with a single wire transmission line |
EP0534654A2 (de) * | 1991-09-26 | 1993-03-31 | Solartron Group Limited | Wasserstandsmessung mit Hochfrequenzwellen |
US5438867A (en) * | 1992-10-05 | 1995-08-08 | Krohne Messtechnik Gmbh & Co. Kg. | Process for measuring the level of fluid in a tank according to the radar principle |
DE4404745A1 (de) * | 1994-02-15 | 1995-08-17 | Grieshaber Vega Kg | Füllstandsmeßvorrichtung und deren Verwendung |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008037302A1 (en) * | 2006-09-29 | 2008-04-03 | Vega Grieshaber Kg | Silo contents measurements system |
CN101523167B (zh) * | 2006-09-29 | 2012-01-25 | Vega格里沙贝两合公司 | 储藏室内存物测量系统 |
Also Published As
Publication number | Publication date |
---|---|
EP1402234A2 (de) | 2004-03-31 |
US20040154392A1 (en) | 2004-08-12 |
US6928867B2 (en) | 2005-08-16 |
WO2002068913A3 (de) | 2004-01-08 |
DE10109453A1 (de) | 2002-09-26 |
AU2002219187A1 (en) | 2002-09-12 |
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