EP1977201A2 - Dispositif permettant de déterminer et de surveiller le niveau d'un milieu dans un contenant - Google Patents

Dispositif permettant de déterminer et de surveiller le niveau d'un milieu dans un contenant

Info

Publication number
EP1977201A2
EP1977201A2 EP07703681A EP07703681A EP1977201A2 EP 1977201 A2 EP1977201 A2 EP 1977201A2 EP 07703681 A EP07703681 A EP 07703681A EP 07703681 A EP07703681 A EP 07703681A EP 1977201 A2 EP1977201 A2 EP 1977201A2
Authority
EP
European Patent Office
Prior art keywords
filling body
dielectric filling
dielectric
antenna
region
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.)
Withdrawn
Application number
EP07703681A
Other languages
German (de)
English (en)
Inventor
Dirk Osswald
Ralf Reimelt
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 EP1977201A2 publication Critical patent/EP1977201A2/fr
Withdrawn legal-status Critical Current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
    • G01F23/28—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
    • H01Q19/06—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 refracting or diffracting devices, e.g. lens
    • H01Q19/08—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 refracting or diffracting devices, e.g. lens for modifying the radiation pattern of a radiating horn in which it is located

Definitions

  • the invention relates to a device for detecting and monitoring the
  • Corresponding devices for detecting and monitoring the level in a container are often used in the measuring devices of automation and process control technology.
  • measuring devices under the name Levelflex and Micropilot are produced and distributed, which operate after the run time-measuring method and serve to determine a level of a medium in a container and / or monitor.
  • TDR Time Domain Reflection
  • a high-frequency pulse is emitted along a Sommerfeld or Goubauschen waveguide or along a Koaxialwellenleiters, which in a jump in the dielectric constant of the medium surrounding the waveguide, so-called DK value is partially reflected back.
  • microwaves are emitted via a horn antenna into a free space or process space, and the echo waves reflected at the medium surface are received again by the horn antenna after the distance-dependent transit time of the measurement signal.
  • the distance of the measuring device to the medium surface can be determined. Taking into account the geometry of the container interior of the level of the medium is then determined as a relative or absolute size.
  • the transit time measurement method can essentially be divided into two preliminary investigations:
  • the first investigation method is based on a transit time measurement, which is a pulse scan requires modulated signal for the distance covered;
  • a second widely used method of determination is based on the determination of the frequency difference of the currently emitted, continuously frequency-modulated high-frequency signal to the received, reflected high-frequency signal (FMCW - Frequency-Modulated Continuous Wave).
  • FMCW continuously frequency-modulated high-frequency signal
  • FMCW Frequency-Modulated Continuous Wave
  • the sensor units are protected by protective elements made of a resistant, dielectric material, such as e.g. a radome or a packing, protected from the aggressive media.
  • a resistant, dielectric material such as e.g. a radome or a packing
  • the reason for the protection of the sensor unit by such protective elements is on the one hand to prevent corrosion of parts of the sensor unit by the medium and on the other hand to prevent the formation of solid deposits and condensate developments, for example in the cavities of a free radiating antenna or in the cavities of a coupling unit of the waveguide.
  • seed formation has a direct influence on the propagation characteristics and reflectivity of the high frequency measurement signals. Due to the buildup of spurious signals occur in the measurement signal, which can cover the reflection signal of the level, whereby the meter for level detection is no longer suitable. In order to avoid starting in these high-sensitivity areas of the sensor unit, they are completely filled by a microwave permeable, dielectric material.
  • a horn antenna for level measurement is presented, which is at least partially filled with a dielectric material.
  • a horn antenna for a radar device is shown, the antenna is at least partially filled with a filling with a dielectric material and / or the entire horn antenna with a dielectric Material filled and completely enclosed. Furthermore, the filling process side is designed so that it forms a Flanschplatt réelle as a sealing element.
  • Fillers made of a dielectric material are at least partially filled, known from the Fönenden patents.
  • a further embodiment of a waveguide is shown with a simple structure, which combines the advantages of a single-wire and a multi-wire waveguide by showing no interaction with container installations, and in a simple way of Deposits or deposits to clean. This has been achieved by the fact that the multi-wire waveguide is at least partially surrounded by a dielectric medium in the process, whereby no approach between the individual waveguides can form.
  • a disadvantage of all embodiments of the protective elements of the sensor units according to the prior art is that the electromagnetic waves of a high-frequency measurement signal are greatly influenced by the dielectric material of the protective element.
  • the invention is therefore based on the object to propose a device which has a minimal effect on the generated electromagnetic measurement signals and thus increases the efficiency and accuracy of the device.
  • the dielectric filling body has at least one hermetically sealed recess volume inside and that the hermetically sealed recess volume is designed so that the dielectric filling body has a predetermined characteristic impedance and / or that the high-frequency Measuring signals have a predetermined propagation characteristic.
  • Level measuring devices with horn antennas or waveguides are known from the prior art, the cavities in the antenna coupling region, in the antenna region, in the probe coupling region and / or in the measuring probe region are filled with a completely filled packing of a dielectric material. By this backfilling of the cavities, no medium or ambient air of the process can accumulate in these areas, which can also lead to no medium accumulation or condensation in the cavities.
  • the dielectric material of the dielectric filling body influences the characteristic impedance of the electromagnetic waves of the high-frequency measurement signal and thus also on the efficiency of the coupling of the generated electromagnetic waves into the waveguide or into the horn antenna.
  • the coupling region of the waveguide should be configured so that the electromagnetic waves generated in the transmitting / receiving unit of the measuring signal are guided almost lossless and coupled without loss of signal in the rod / rope element.
  • the electromagnetic waves of the measurement signal generated in the transmitting / receiving unit should be attenuated as little as possible of the dielectric filling body and changed in their emission characteristics. In an area filled with air or a special gas, the electromagnetic waves experience almost no influence.
  • a dielectric filling body is proposed according to the invention which completely completes the cavities fills and at least one hermetically sealed recess volume has to adapt the characteristic impedance.
  • dielectric materials for example, technical ceramics and / or plastics are used here.
  • the dielectric filling body is made with at least one recess volume of a plastic. It has proved to be advantageous to produce the dielectric filling body made of chemically resistant plastic by means of an injection molding process or by the process of isostatic pressing.
  • the dielectric filling body consists of several individual parts.
  • a dielectric filler In the injection molding of plastics, it is very difficult to use a dielectric filler to produce a well-defined recess volume. The same applies to a dielectric filler of a ceramic material, which was produced by any method. For this reason, it is usually necessary to carry out the dielectric filling body at least from two individual parts.
  • An expedient embodiment of the invention is that the individual parts of the dielectric filling body are assembled hermetically sealed by means of a substance-conclusive connection technology.
  • the multipart dielectric filling body is connected by means of a material connection, such as e.g. Welding and gluing together, so that forms at least a hermetically sealed recess volume inside.
  • the ultrasonic welding technique is particularly suitable here, in that the bearing surfaces or connecting points of the multi-part dielectric filling body are melted together by frictional heat generated.
  • An advantageous embodiment of the invention is the fact that the individual parts of the dielectric filling body are joined together hermetically by means of a non-positive connection technology.
  • connection technique is a frictional connection, which joins the multipart dielectric packing by, for example, screws, rivets or a screw, so that forms at least a hermetically sealed recess volume in the interior.
  • a gas or a gas mixture is introduced in the recess volume of the dielectric filling body.
  • a special gas e.g. Helium trapped and measured with a leakage meter or a gas meter possibly leaking gas.
  • the tightness of the recess volume can be checked in multi-part design.
  • Another advantage of introducing a special gas is that the moisture-saturated air is displaced from the recess volume by the dried and / or hydrophobic gas and that no condensate can form when temperature changes occur. Furthermore, by using special gases in the recess volume, the characteristic impedance can be adjusted.
  • a further advantageous embodiment of the invention is to be seen in that in the recess volume of the dielectric filling body, a dielectric Filler material is provided with a low dielectric constant, which does not affect the propagation characteristic of the high-frequency measurement signals.
  • Adjusting the configuration of the recess volume it is to fill the recess volume with a dielectric solid or a dielectric liquid having a lower dielectric constant than the material of the dielectric filling body.
  • the hermetic tightness of the recess volume of the dielectric filling body is also achieved by the complete filling with a dielectric filling material.
  • Recess volume of the dielectric filling body is provided at least one support element.
  • supporting elements are introduced into the recess volume, which distribute the mechanical forces acting externally on the dielectric filling body uniformly.
  • the distribution of forces by the support elements is designed so that the shape of the dielectric filling body barely changed under mechanical forces acting in a certain limit range.
  • a probe fastening element is provided, which is arranged in the dielectric filling body against rotation and centered.
  • the rod / cable element of the waveguide is held by the dielectric filling body.
  • the attachment of the rod / cable element is effected, for example, by means of a probe fastening element embedded in the dielectric filling body in a form-fitting manner, such as e.g. a hex screw, whereby the rod / rope element is interchangeable.
  • a very advantageous variant of the invention is to be seen in that on the Surface of the dielectric filling body, a dielectric, gas-tight and / or hydrophobic coating is attached.
  • the coating of the dielectric filling body with a dielectric, gas-tight and / or hydrophobic material prevents a liquid medium or condensate from creeping along at a possible gap between the dielectric filling body and the horn antenna housing or the process connection housing by capillary action.
  • it is intended to create a diffusion barrier for preventing the diffusion of the medium through the material of the dielectric filling body into the recess volume.
  • Another possibility is to provide the dielectric filling body with an electrically conductive coating in the regions in which the electromagnetic waves of the measuring signals are guided and their emission characteristics or characteristic impedance are adjusted. Through this conductive coating, the medium or condensate that has entered the gap can not affect the characteristic impedance and the reflection properties of the electromagnetic waves. This electrically conductive coating must be contacted to the horn antenna housing or the process connection housing electrically conductive.
  • FIG. 1 shows a schematic overall view of a device mounted on a container for detecting and monitoring the level of a medium in a container by means of a horn antenna according to the invention
  • FIG. 2 shows a schematic representation of a first embodiment of the device with horn antenna
  • FIG. 3 shows a schematic illustration of a first embodiment of the multipart dielectric filling body of the horn antenna from FIG. 2, FIG.
  • FIG. 4 is a sectional view of the first embodiment according to the marking A-A in Fig. 3,
  • FIG. 5 shows a schematic illustration of a second embodiment of the multipart dielectric filling body of the horn antenna
  • FIG. 6 shows a sectional view of the second embodiment according to the marking B-B in Fig. 5,
  • Fig. 7 a schematic overall view of a mounted on a container Device for detecting and monitoring the level of a medium in a container by means of a waveguide according to the invention
  • FIG. 8 is a schematic sectional view of a third embodiment of the device with waveguide
  • FIG. 9 is a perspective view of the third embodiment of the dielectric filling body of Fig. 8,
  • FIG. 10 is a schematic sectional view of the third embodiment of the dielectric filling body of FIG. 8.
  • FIG. 10 is a schematic sectional view of the third embodiment of the dielectric filling body of FIG. 8.
  • FIG. 11 shows a schematic representation of a fourth embodiment of the device with dielectric stem radiator
  • FIG. 1 an application example of the device 1 according to the invention with an antenna 10, in particular a horn antenna 10.1, is shown.
  • the device 1 or the measuring device in FIG. 1 is mounted on a flange 15 in a socket 31 of the container 4 via fastening elements 16.
  • the antenna 10 can be divided into two basic areas: the coupling-in area 7 and the antenna area 8.
  • the device or the measuring device 1 includes a transmitting / receiving unit 22 in the transmitter 23, in which the high-frequency measuring signals 6 are generated. Via a coupling-in element 24, the high-frequency measuring signals (6) in the coupling-in region 7 or the waveguide of the antenna 10 are guided in a specific mode, for example TE mode.
  • the coupled into the antenna 10 high-frequency measurement signals 6 are emitted through the material of the dielectric filling body 12 from the antenna 10 into the process chamber 5 with a predetermined emission characteristics as transmission signals S. In most cases, a radiation characteristic of the high-frequency measurement signals 6 with a planar wavefront is sought.
  • This desired radiation characteristic of the high-frequency measurement signals 6 is achieved in that due to the configuration of the dielectric filling body 12, for example by the recess volume 13 according to the invention and / or by matching elements 12.4, the characteristic impedance and the propagation characteristic of the high-frequency measurement signals 6 in the antenna 10 is adjusted accordingly.
  • the high-frequency measuring signals 6 or transmitting signals S emitted into the process space 5 are reflected on a surface of the medium 3 as reflection signals R and, after a certain transit time, are received again by the transmitting / receiving unit 22 in the measuring converter 23. Over the duration of the high-frequency measurement signals 6 and by means of the knowledge of the geometry of the container 4, the level 2 of the medium 3 in the container 4 is determined.
  • the control / evaluation unit 21 in the transmitter 23 has the task of evaluating the received, reflected echo or the reflection signals R of the high-frequency measurement signals 6 by the high-frequency measurement signals 6 by means of signal processing and special Signalaustechnischsa ⁇ orithms further processed and From this result, the running time or level 2 is determined.
  • the device 1 is supplied with the required energy.
  • the control / evaluation unit 21 communicates via a bus interface 20 and the field bus 18 with a remote control point and / or with other devices 1 or field devices, which are not explicitly shown.
  • An additional supply line 19 for supplying power to the device 1 is dispensed with if the device 1 is a so-called two-wire field device whose communication and power supply via the field bus 18 are exclusively and simultaneously achieved via a two-wire line.
  • the data transmission or communication via the fieldbus 18 takes place, for example, according to the CAN, HART, PROFIBUS DP, PROFIBUS FMS, PROFIBUS PA, or FOUNDATION FIELDBUS standard.
  • Fig. 2 to Fig. 5 is a horn antenna according to the invention 10.1 and a horn-shaped antenna made of an electrically conductive material, the cavity 35 is at least partially filled with a dielectric filling body 12, shown.
  • a dielectric filler body 12 is introduced as a protective element or a process separator to avoid buildup and corrosion.
  • the Flanschplatt ist shown here 12.3 has been found to be advantageous sealant to the process chamber 5 out.
  • the dielectric filling body 12 as a passive element of the horn antenna 10.1, sealed by the Flanschplatt ist 12.3 between the flanges 15 of the Hornantennengeophuses 37 and the nozzle 31 of the container 4, the active elements, such as the coupling unit 35 and the transmitter 23, from the medium 3 in the process space 5.
  • This dielectric filling body 12 prevents, as a protective element or as a process isolating element, that the horn antenna 10.1 comes into direct contact with the medium 3 of the process and that, if appropriate, condensate forms in the cavity 35.
  • the horn antenna 10.1 consists for example of a metal, of stainless steel or of a conductive plastic.
  • the dielectric filling body 12 is made of a dielectric material, in particular polyetherketone (PEK, PEEK), polytetrafluoroethylene (PTFE) or perfluoroalkoxy copolymer (PFA) ,
  • PES polyetherketone
  • PTFE polytetrafluoroethylene
  • PFA perfluoroalkoxy copolymer
  • PCTFE polychlorotrifluoroethylene
  • ECTFE ethylene Chlorotrifluoroethylene-ethylene
  • ETFE ethylene tetrafluoroethylene
  • PVDF polyvinylidene fluoride
  • PVF polyvinyl fluoride
  • FEP fluorinated ethylene propylene
  • dielectric filling body 12 has good chemical and physical properties, such as resistance to almost all chemicals, very high temperature resistance, good microwave permeability and good RF performance, making these materials predestined for use as dielectric fillers 12 in process instrumentation instruments.
  • the design of the dielectric filling body 12 is limited by the feasibility in the production.
  • at least one recess volume 13 is introduced in the dielectric filling body 12 because of the better HF performance or the better adaptation of the wave resistance.
  • the production of the dielectric filling body 12 is accomplished by a chip-removing process, an injection molding or an isostatic pressing of the dielectric material or plastic.
  • the dielectric filling body 12 is made of several individual parts, consisting of a base body 12.1 with a lid 12.2, which may be made of different materials executed. These items are connected by a cohesive bonding technique that creates a durable, hermetically sealed joint 30.
  • the joints 30 of the individual parts of the dielectric filling body 12 by means of an ultrasonic welding technology connect.
  • the individual parts consisting of the base body 12.1 and the lid 12.2, brought with a defined pressure with the connection points 30 in contact.
  • a vibrating element is set in vibratory motion, which is caused by the friction heat a localized melting process of the material and a welding of the parts takes place at the connection points 30.
  • the welding procedure is carried out under a dry protective gas atmosphere, so that the recess volume 13 of the welded dielectric filling body 12 of this dry gas is under a certain pressure, or it is specifically in the recess volume 13, a dry gas, such as nitrogen, helium, argon introduced.
  • This gas has two functions; on the one hand, this gas displaces the steam-saturated air from the recess volume 13, so that no condensate can form in it when the temperature changes; and on the other hand, by means of this gas, the tightness of the weld at the connection points 30 can be checked.
  • a gas sensor info ⁇ e determined by a diffusion or leakage from the welded dielectric filling body 12 passing gas.
  • the gas When selecting the gas, care is taken to ensure that the high-frequency measuring signal 6 is influenced as little as possible by this gas.
  • additional filling material of the dielectric filling body 12 it is also possible to use special liquids and solids with a low dielectric constant e r which do not or only slightly influence the high-frequency measuring signal 6.
  • the invention can also be used in what are known as dielectric stem radiators 10.2 or rod radiators, which is explicitly illustrated in FIG. 11.
  • the antenna element radiating the high-frequency measurement signals 6 into the process space 5 is designed as a rod made of a dielectric material in such a dielectric stub radiator.
  • this radiating element is to a certain extent designed as a dielectric filling body 12 with a corresponding hermetically sealed recess volume 13 in the cavity 35 of the antenna coupling region 7.1.
  • the stem radiator 10.2 is constructed, for example, from a base body 12.1 and a cover 12.2, which are hermetically sealed together or is produced in one piece by means of an injection molding process.
  • the embodiments of the connection technology of the base body 12.1 with the lid 12.2 and the control by the transmitter, and its structure, is not explicitly listed here and can be found in the rest of the description.
  • Fig. 3 and Fig. 4 an embodiment of the dielectric filling body 12 is shown, the base body 12.1 is completely recessed by a recess volume 13, so that only a thin wall remains.
  • the matching of the characteristic impedance of the horn antenna 10.1 in one embodiment is optimized as a horn antenna, but the dielectric packing 12 does not have too high mechanical stability and compressive strength.
  • a measuring device with a horn antenna 10.1, which contains such a dielectric filling body 12 can be used in a process where no large pressures and temperature changes are expected.
  • supporting members 14 In order to increase the pressure resistance and the mechanical stability of the dielectric filling body 12, supporting members 14 have been inserted in the recess volume 13 as shown in FIGS. 5 and 6. Since this example is a frusto-conical horn antenna, the supporting elements 14 are arranged radially symmetrically in the shape of a spoke for mechanical stabilization. However, other configurations of support elements 14 may be used.
  • Another embodiment of the invention is e.g. sealed by injection molding dielectric filling body 12 with the process atmosphere partially open recess volume 13 with a corresponding selectively permeable membrane.
  • this membrane allows a gas molecule exchange and, on the other hand, it does not allow water to pass into the recess volume 13.
  • the characteristic impedance adapted transition between the dielectric filling body 12 and the subsequent process chamber 5, the process space 5 facing side of the dielectric filling body 12 is formed as a matching element 12.4, for example, has the shape of a blunt cone.
  • phase differences between individual wavebands that can arise when passing through the horn geometry are compensated, and the high-frequency measurement signals 6 are emitted as a transmission signal S in a planar wavefront.
  • planar, convex or concave transition geometries to form the desired radiation characteristic.
  • the high-frequency measuring signal 6 is, as shown in Fig. 1, via a coupling element 24 in the coupling region 7, which is formed as a round or rectangular waveguide introduced.
  • the waveguide or the coupling region 7 is designed so that a TE wave mode is formed.
  • the dielectric filling body 12 is in turn equipped with an adapter element 12.4, for example a cone tip or a stepped pyramid, in order to ensure a good matching of the air-filled waveguide to the dielectric material filled waveguide.
  • an adapter element 12.4 for example a cone tip or a stepped pyramid
  • Fig. 7 an application example of the device 1 according to the invention as a Zeit Schl.sreflektormeter or TDR measuring system for determining the continuous level 2 of a medium 3 in a container 4 with a waveguide 11 is shown.
  • the device 1 determines according to the transit time measurement method, the level 2 of a medium 3 or a Fü% uts in this container 4.
  • the waveguide 11 can be basically divided into two areas: the coupling region 7 and the probe area 9.
  • This device 1 is for example mounted via a screw 17 in an opening of the container 4.
  • the electromagnetic waves of the high-frequency measurement signal 6 are guided through a coaxial-like coupling region 7 through the region of the nozzle 31 or the screw 17 and coupled in the rod and rope-shaped probe area 9 in the process chamber 5 of the container 4 on the rod / rope element 11.1. Due to the coaxial configuration of the coupling-in region 7, a TEM mode of the high-frequency measuring signals 6 forms there, which represents a preferred embodiment for the almost lossless and interference-free transmission of the high-frequency measuring signals 6.
  • a configuration of a TM 01 mode in the near field region of the rod / cable element 11. 1 is generated for optimum measurement of the level 2 of a medium 3 in a container 4.
  • the TDR measuring method works according to the following measuring principle: About the
  • the electromagnetic waves of the high-frequency measurement signal 6 which are guided by the skin effect in the near field region of the rod / cable element 11.1 of the waveguide 11, in other words along the surface of the rod / cable element 11.1, in the direction of the medium 3 and the process space 5 as transmission signals S out.
  • the energy components of the high-frequency transmission signal S are reflected back at least partially as reflection signals R when the dielectric constant e r of the surrounding medium 3 jumps, and a change in the characteristic impedance associated with this occurs.
  • the reflection signals R run back in the opposite direction at the waveguide 11 to the transmitting / receiving unit 22.
  • This discontinuity is present, for example, when the first dielectric constant e rl of the gas phase superimposed on the medium 3, in particular of the air gap, is smaller than the second dielectric constant e r2 of the medium 3.
  • the measured transit time of the high-frequency measurement signal 6 is determined by a Conversion using the formula of the shaft speed determines the distance traveled. This difference distance corresponds to the height of the container 4 minus the height of the level 2 of the medium 3 in the container 4.
  • the height of the container 4 and the position of the coupling of the high-frequency measuring signal 6 is assumed to be known, causing the level 2 in the container 4 through a simple subtraction of the measured running distance of the high-frequency measurement signal 6 can be determined from the height of the container 4.
  • the electromagnetic waves of the measuring signal 6 are generated, for example, as pulses with a bandwidth of 0-1.5 GHz in the transmitting / receiving unit 22 and by means of a coupling element 24 as a transmission signal S in a waveguide 11, for example a Sommerfeld waveguide, as shown in Fig. 7 and Fig. 8, coupled. They are also Goubau waveguides; Coaxial, microstrip, or coaxial and parallel arrangements of multiple rod / rope elements 11.1 can be used, but which are not explicitly shown in the drawings.
  • the reflecting signals R returning to the bar / cable element 11.1 of the waveguide 11 due to the discontinuity of the dielectric constant e r of the surrounding medium 3 are in turn received and preprocessed in the transmitting / receiving unit 22.
  • These preprocessed reflection signals R are evaluated metrologically and signal technically in the control / evaluation unit 12 and processed so that the measured value of the level 2 or an echo curve signal representing the processed envelope of the reflection signals R, via a bus interface 20 to the field bus 18 to, for example, a Control center is forwarded.
  • the coupling region 7 of the waveguide 11 is formed as a coaxial conductor structure, for example, from a conductive process connection housing 36 as an outer conductor and a conductive rod / cable element 11.1 as an inner conductor.
  • the rod / cable element 11.1 is embedded in the coupling region 7 in a dielectric filling body 12 made of a dielectric material which positions the rod / cable element 11.1 centered in the cavity 35 of the process connection housing 36.
  • a probe attachment member 28 the rod / rope element 11.1 is held against rotation and interchangeable in the base body 12.1 of the dielectric filling body 12.
  • the probe attachment member 28 is an ordinary hex screw having a bore in the end face of the screw head.
  • external thread on the probe mounting member 28 and a corresponding blind hole thread in the rod / cable element 11.1 is both electrically conductive and connected to the main body 12.1 of the dielectric filling body 12 frictionally.
  • On the main body 12.1 an anti-rotation 12.5 in the form of a bulge or bulge is formed, which fits positively into a corresponding counterpart in the cavity 35 of the process connection housing 36 and thus prevents twisting of the dielectric filling body in the process connection housing 36.
  • the base body 12.1 of the dielectric filling body 12 with the probe fastening element 28 sunk therein is welded to a cover 12.2, for example via an ultrasonic welding method, so that the recess volumes 13 in the base body 12.1 are hermetically sealed.
  • the dielectric filling body 12 can also be made in one piece. These recess volumes 13 are introduced into the main body 12 of the dielectric filling body 12 in order to improve the HF performance of the coupling element 24 and thus to minimize interference reflections of the high-frequency measuring signal 6 due to the dielectric material of the dielectric filling body 12.
  • the probe coupling 27 contacting the probe fastening element 28 is introduced into a glass feedthrough 26, which enables a gas-tight process separation to the electronics of the transmitter 23.
  • the probe coupling is completed, for example via a coaxial plug 38.
  • a diaphragm 29 made of a resistant and temperature-stable material, such as. a ceramic with sealing elements 32, e.g. O-rings attached This panel is designed to handle aggressive media 3 or high temperatures.
  • the dielectric filling body 12 is shown in two different views.
  • Fig. 9 shows two three-dimensional exploded views different angles, whereby different aspects of the subject invention are shown more clearly.
  • the Standköper 12 consists basically of a body 12.1 with recess volume 13 and support members 14 and a lid 12.2. As already described above, the two parts are connected to one another via a cohesive connection method at the connection points 30 or contact points, or they are designed as a one-piece dielectric filling body 12.
  • the probe attachment member 28 is centered with a washer 33 positioned in a recess volume in the body 12.1.
  • a positive locking element 34 which is as shown on the cover 12.2 or even in the base body 12.1 itself, the probe attachment member 28 and the hexagonal screw is placed against rotation.
  • the rod / cable element 11.1 can thus be screwed in without a tool having to be attached directly to the probe fastening element 28: it can be screwed in by a corresponding fixing of the entire coupling element 24.

Abstract

La présente invention concerne un dispositif (1) permettant de déterminer et de surveiller le niveau (2) d'un milieu (3) dans un contenant (4) par un procédé de mesure du temps de propagation de signaux de mesure haute fréquence (6), lequel dispositif présente une antenne (10), constituée d'une section d'injection d'antenne (7.1) et d'une section d'antenne (8), ou un guide d'ondes (11), constitué d'une section d'injection de sonde (7.2) et d'une section de sonde de mesure (9) s'étendant dans le contenant (4), des cavités (35) situées dans la section d'injection d'antenne (7.1), dans la section d'antenne (8), dans la section d'injection de sonde (7.2) et/ou dans la section de sonde de mesure (9) étant au moins partiellement remplies d'un corps de remplissage diélectrique (12). Cette invention se caractérise en ce que le corps de remplissage diélectrique (12) renferme au moins un volume évidé hermétiquement étanche (13) et ce volume évidé hermétiquement étanche (13) est conçu de sorte que le corps de remplissage diélectrique (12) présente une impédance caractéristique prédéterminée et/ou les signaux de mesure haute fréquence (6) présentent une caractéristique de propagation prédéterminée.
EP07703681A 2006-01-25 2007-01-08 Dispositif permettant de déterminer et de surveiller le niveau d'un milieu dans un contenant Withdrawn EP1977201A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006003742A DE102006003742A1 (de) 2006-01-25 2006-01-25 Vorrichtung zur Ermittlung und Überwachung des Füllstandes eines Mediums in einem Behälter
PCT/EP2007/050128 WO2007085518A2 (fr) 2006-01-25 2007-01-08 Dispositif permettant de déterminer et de surveiller le niveau d'un milieu dans un contenant

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EP1977201A2 true EP1977201A2 (fr) 2008-10-08

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US (1) US8482296B2 (fr)
EP (1) EP1977201A2 (fr)
CN (1) CN101375137B (fr)
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WO (1) WO2007085518A2 (fr)

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Also Published As

Publication number Publication date
WO2007085518A2 (fr) 2007-08-02
US8482296B2 (en) 2013-07-09
US20090178478A1 (en) 2009-07-16
CN101375137A (zh) 2009-02-25
CN101375137B (zh) 2012-01-04
WO2007085518A3 (fr) 2007-09-13
DE102006003742A1 (de) 2007-08-02

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