EP1537388A1 - Dispositif d'orientation destine a un appareil de mesure - Google Patents

Dispositif d'orientation destine a un appareil de mesure

Info

Publication number
EP1537388A1
EP1537388A1 EP03750502A EP03750502A EP1537388A1 EP 1537388 A1 EP1537388 A1 EP 1537388A1 EP 03750502 A EP03750502 A EP 03750502A EP 03750502 A EP03750502 A EP 03750502A EP 1537388 A1 EP1537388 A1 EP 1537388A1
Authority
EP
European Patent Office
Prior art keywords
alignment device
container
measuring device
tube
level measuring
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
EP03750502A
Other languages
German (de)
English (en)
Inventor
Bernd Eichholz
Daniela Huber
Jörg TRINLER
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 EP1537388A1 publication Critical patent/EP1537388A1/fr
Ceased 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
    • G01F23/296—Acoustic waves
    • G01F23/2962—Measuring transit time of reflected waves
    • 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
    • G01F23/003—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 with a probe suspended by rotatable arms
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01F23/292—Light, e.g. infrared or ultraviolet
    • G01F23/2921—Light, e.g. infrared or ultraviolet for discrete levels
    • G01F23/2928—Light, e.g. infrared or ultraviolet for discrete levels using light reflected on the material surface
    • 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
    • G01F23/296—Acoustic waves
    • G01F23/2968—Transducers specially adapted for acoustic level indicators

Definitions

  • the invention relates to an alignment device for a level or point level measuring device.
  • Measuring devices for determining a fill level or limit level of a medium in a container are known in a large number of different designs.
  • non-contact level gauges are available which are mounted on, on or in a lid of the container and above the maximum expected level of the medium in the container. Quasi from above, these non-contact level measuring devices send measuring signals inside the container to the medium, on the surface of which these measuring signals are reflected and returned to the measuring device. The distance between the medium surface and the measuring device can be determined from the reflected signals or their transit time, which results in the desired fill level of the medium taking into account the geometry of the container.
  • level indicators are usually mounted at a predetermined location or height in a side wall of the container so that they protrude into the interior of the container and are used there as a so-called level switch. If, for example, they are used as overfill protection and are accordingly installed at the position of the maximum permissible fill level in the container, they generate a switching signal when they are covered by the medium, with which a further inflow of the medium into the container is switched off or interrupted. If, for example, the level switches are used as pump protection and are accordingly installed at the position of the minimum fill level in the container that should not be undercut, they will generate a switching signal when they are covered by the medium, with which further pumping or draining of the medium out of the Container is prevented.
  • the measuring devices In the case of an unfavorable container shape or an unfavorable mounting position of the measuring device, it is currently not possible to position or align the measuring devices in the desired manner in relation to the measuring location or the necessary measuring section.
  • Devices are known with the aid of which a level measuring device described above can be aligned, but with these devices only a very small angle of inclination of the measuring device can be set and / or they are not sealed off from the inside of the container.
  • the invention is therefore based on the object of providing a pressure-tight alignment device for a filling level or point level measuring device, which makes it possible to position and / or align the measuring device in the desired manner.
  • an alignment device for a measuring device for determining a fill level or limit level of a medium in a container, in which the alignment device comprises a pivotable spherical clamping device which can be fastened to the container and which comprises a seal against the interior of the container ,
  • the seal is a purely metallic seal.
  • the seal is an elastomer seal, for example an O-ring seal.
  • Another preferred embodiment of the alignment device according to the invention relates to a fill level measuring device based on the ultrasound principle. Yet another preferred embodiment of the alignment device according to the invention relates to a point level measuring device based on the tuning fork principle.
  • the alignment device comprises a tube which serves as a cable guide.
  • the spherical clamping is arranged on the tube and / or the tube is arranged displaceably in the spherical clamping.
  • Yet another embodiment of the invention relates to an alignment device in which a connection device for a drive and / or a sensor of the fill level measuring device is attached to the end of the tube.
  • the spherical clamping is clamped on a flange on or on the container by a holding plate.
  • Still other embodiments of the invention relate to the fastening of the spherical clamping of the alignment device to a cover plate which closes a manhole of the container and which, in a special embodiment, can be pivoted away from the container.
  • FIG. 1a shows a schematic overall representation of a level measuring device mounted on a first container with an alignment device according to the invention
  • Figure 1 b is an overall schematic representation of a level meter mounted on a second container with an alignment device according to the invention
  • FIG. 2 shows a schematic perspective side view of a microwave fill level measuring device with a first preferred embodiment of the alignment device according to the invention with a partial sectional view of the alignment device and various antennas;
  • 3a shows a perspective side view of a microwave fill level measuring device with an alignment device according to FIG. 2 with a parabolic antenna
  • 3b is a perspective side view of a microwave level measuring device with an alignment device according to FIG. 2 with a rod antenna
  • 3c shows a perspective side view of a microwave fill level measuring device with an alignment device according to FIG. 2 with a Hom antenna
  • FIG. 3d shows a perspective side view of a microwave fill level measuring device with an alignment device according to FIG. 2 with a planar antenna
  • 4 shows a schematic perspective side view of a microwave fill level measuring device with a second embodiment of the alignment device according to the invention with further measuring devices;
  • Fig. 5a is a side perspective view of a microwave level meter with an alignment device according to Fig. 3a, the mounted on a cover of a manhole of a container; and FIG. 5b shows a perspective side view of a microwave fill level measuring device with an alignment device according to FIG. 5a with the cover of the manhole opened.
  • FIGS. 1a and 1b show two different containers 1 and 10, on each of which a level measuring device 2 or 16, for example level measuring devices according to a transit time method, is mounted.
  • the first container 1 in the example shown here is a cylindrical container with a domed lid 3, in which there is a first medium 4, which, as shown here, can be a liquid, for example, and its fill level with the here as a free-radiating device shown first level measuring device 2 is measured.
  • the liquid medium 4 forms in the container 1 a horizontal surface 5 on which the measurement signals which are sent from the fill level measuring device 2 to the medium 4 are reflected.
  • the reflected signals are received by the fill level measuring device 2 and are used to determine the distance between the fill level measuring device 2 and the surface 5, so that the desired fill level of the medium 4 in the container 1 is determined in the knowledge of the geometric conditions inside the container 1.
  • FIG. 1a A path of the signals from the level measuring device 2 to the medium 4 and back is illustrated in FIG. 1a by a dashed line which represents the measuring section 6.
  • a dashed line which represents the measuring section 6.
  • openings such as manholes 8 or sockets, can be used for installing a fill level measuring device 2. If the manhole 8 or the connecting piece can be closed by an inclined cover 7, the fill level measuring device 2 is usually attached to it.
  • the fill level measuring device 2 can be aligned by means of an alignment device 20 according to the invention on an inclined cover 7 of a manhole 8 in the curved lid 3 of the container 1 in such a way that the measuring section 6 is perpendicular to the surface 5 of the medium 4, as is the case is shown in Fig. 1a.
  • FIG. 1b The example of a second container 10 shown in FIG. 1b is a container 10 with a flat lid 11 and a conical lower part 12. In such a container 10, as shown in FIG.
  • FIG. 1b illustrates a pourable second medium 13 stored or stocked, a so-called bulk material, for example sand or cement. In most cases, no horizontal surface is formed with this medium 13.
  • a second fill level measuring device 16 is fastened on a nozzle 15 there.
  • the second fill level measuring device 16 is again shown in a similar manner to the first fill level measuring device 2 in FIG. 1 a as a free-radiating measuring device according to the transit time method, with which the desired fill level of the second medium 13 can be determined similarly to the first fill level measuring device 2.
  • the bulk material medium 13 does not form a horizontal surface in the container 10 but a surface 14 in the form of a cone of bulk.
  • a dashed line 17 illustrates the path of the measurement signals to the pouring cone and thus the measurement section.
  • the measuring distance is the shortest distance from the fill level measuring device 16 to the medium 13. This is usually the case when the measuring section is perpendicular to a flank of the pouring cone.
  • the second fill level measuring device 16 can be aligned by means of the alignment device 20 according to the invention already presented in FIG. 1 a in such a way that the measuring section 17 is perpendicular to the surface 14 of the medium 13, as shown in FIG. 1 b.
  • the signals reflected on the surface 14 of the medium 13 are received by the fill level measuring device 16 and serve to determine the. Knowing the geometric conditions inside the container 10 and the pouring cone usually formed by the medium 13, the desired fill level is determined.
  • the microwave fill level measuring device 40 comprises an electronics housing 41 with a connecting part 42 and an antenna 43 for emitting and receiving the measurement signals.
  • the alignment device 20 comprises a connecting piece 21 which is connected to the connecting part 42 of the fill level measuring device 40.
  • a pivotable spherical clamping 23 is attached, which is inserted into a recess of a flange 35 designed as a ball seat 22.
  • the ball seat 22 is preferably a through hole in the flange, in which the edge is chamfered. A possible embodiment of such a ball seat 22 is shown in cross section in partial elevation in FIG. 2.
  • the connector 21 and the pivotable spherical clamping 23 are provided with a continuous bore into which a tube 24 is inserted.
  • the tube 24 is the circular waveguide for the microwave signals and connects the electronics in the electronics housing 41 to the antenna 43.
  • a parabolic antenna 43a and a planar antenna 43b are exemplified in FIG , which are each connected to the waveguide tube 24.
  • a recess (not designated in any more detail) is made in that part of the pivotable spherical clamping 23 which faces the electronics housing 41.
  • a helical spring 25 is inserted into this recess, which engages around the tube 24 and braces the spherical clamping 23 against the electronics housing 41.
  • a sealing ring seat is incorporated in the ball seat 22 and a seal 28, for example an elastomer seal, preferably an O-ring, is inserted into it.
  • This seal 28 enables the interior of the container to be sealed from the atmosphere.
  • Such a seal is particularly advantageous if the flange 35 is a welding flange, which in the
  • Container lid is welded.
  • Other types of sealing are also conceivable.
  • a purely metallic seal can also be used.
  • Loosening the screws 27 makes it possible to pivot the alignment device 20, more precisely: its spherical clamping 23, in the ball seat 22 and thus align the antenna 43 of the fill level measuring device 40 in the desired manner.
  • a microwave fill level measuring device 40 each with different antennas 43, is shown as an overall perspective view.
  • 3a shows the microwave fill level measuring device 40 with a parabolic antenna 43a.
  • the attachment of the spherical clamping 23 of the alignment device 20 to the flange 35 by means of a holding plate 26 is clearly visible.
  • the tube 24, which serves as a waveguide, is also clearly visible.
  • 3b shows the microwave fill level measuring device 40 again, this time with a rod antenna 43c, which in this embodiment is attached directly below the flange 35.
  • 3c and 3d show further versions of the microwave fill level measuring device 40 and the alignment device 20. The differences lie in the antennas used, horn antenna 43d in FIG. 3c and planar antenna 43b in FIG. 3d, and the resulting embodiments of the alignment device 20.
  • the alignment device 20 is mounted on an electronics housing 50 in the manner already described above, the spherical clamping 23 of which is in turn held on the flange 35 by the holding plate 26.
  • a level detector 51 for example a level switch based on the tuning fork principle, or an ultrasonic transmitter 52 continuously measuring the level, which together with the corresponding electronics in the electronics housing 50 forms an ultrasonic level measuring device, can be connected to the alignment device 20.
  • a seal can also be provided between the tube 24 and the spherical clamping.
  • the microwave fill level measuring device 40 with parabolic antenna 43a (see also FIG. 3a) and the alignment device 20 are mounted on a pivotable cover plate 54 of a manhole 55 in the lid area in FIGS. 5a and 5b a container (see also Fig. 1a and 1b).
  • the microwave fill level measuring device 40 which is connected to the spherical clamping device 23, is fastened to the cover plate 54 by the holding plate 26, which clamps the clamping device 23 against the flange 35 (see also FIG. 2).
  • the length of the tube 24 and the parabolic antenna 43a attached to it can be adjusted in the manhole 55 and the container by a suitable length of the tube 24 or by its displaceability in the spherical clamping 23 such that when the cover plate 54 is opened, as shown in FIG. 5b shows that the microwave fill level measuring device 40 together with its antenna can be pivoted out of the manhole 55.
  • the antenna can be aligned in the desired manner on the surface of the medium in the container by pivoting the spherical clamping 23 of the alignment device 20 (See also Fig. 1a), so that not horizontally arranged covers of a manhole can be taken into account.

Landscapes

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

Abstract

L'invention concerne un dispositif d'orientation (20) permettant, même en cas de conditions de montage défavorables sur le contenant (10), de monter et d'orienter un appareil de mesure de niveau sur le contenant (10) de manière que la trajectoire de mesure (17) soit perpendiculaire à la surface (14) d'un milieu (13) devant être mesuré. Le dispositif d'orientation (20) permet de faire pivoter l'appareil de mesure (16) tout en garantissant l'étanchéité du contenant. Ledit dispositif d'orientation se présente sous la forme d'un élément de serrage sphérique pivotant, pouvant être fixé au contenant, comportant un joint par rapport à l'intérieur du contenant.
EP03750502A 2002-09-12 2003-09-09 Dispositif d'orientation destine a un appareil de mesure Ceased EP1537388A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10242500A DE10242500A1 (de) 2002-09-12 2002-09-12 Ausrichtvorrichtung für ein Meßgerät
DE10242500 2002-09-12
PCT/EP2003/010006 WO2004027353A1 (fr) 2002-09-12 2003-09-09 Dispositif d'orientation destine a un appareil de mesure

Publications (1)

Publication Number Publication Date
EP1537388A1 true EP1537388A1 (fr) 2005-06-08

Family

ID=31724724

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03750502A Ceased EP1537388A1 (fr) 2002-09-12 2003-09-09 Dispositif d'orientation destine a un appareil de mesure

Country Status (6)

Country Link
US (1) US7552634B2 (fr)
EP (1) EP1537388A1 (fr)
CN (1) CN100399001C (fr)
AU (1) AU2003270158A1 (fr)
DE (1) DE10242500A1 (fr)
WO (1) WO2004027353A1 (fr)

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Also Published As

Publication number Publication date
CN1682096A (zh) 2005-10-12
WO2004027353A1 (fr) 2004-04-01
US20060201245A1 (en) 2006-09-14
US7552634B2 (en) 2009-06-30
AU2003270158A1 (en) 2004-04-08
CN100399001C (zh) 2008-07-02
DE10242500A1 (de) 2004-03-18

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