[go: up one dir, main page]

WO2003052360A1 - Appareil de mesure de niveau - Google Patents

Appareil de mesure de niveau Download PDF

Info

Publication number
WO2003052360A1
WO2003052360A1 PCT/EP2002/014032 EP0214032W WO03052360A1 WO 2003052360 A1 WO2003052360 A1 WO 2003052360A1 EP 0214032 W EP0214032 W EP 0214032W WO 03052360 A1 WO03052360 A1 WO 03052360A1
Authority
WO
WIPO (PCT)
Prior art keywords
probe
container
vibration exciter
measuring device
vibration
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
PCT/EP2002/014032
Other languages
German (de)
English (en)
Inventor
Armin Wendler
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
Priority to AU2002358666A priority Critical patent/AU2002358666A1/en
Publication of WO2003052360A1 publication Critical patent/WO2003052360A1/fr
Anticipated expiration legal-status Critical
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
    • G01F23/284—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
    • G01F23/296—Acoustic waves

Definitions

  • the invention relates to a fill level measuring device for measuring a fill level of a filling material in a container by means of a probe protruding into the container.
  • the probe can e.g. serve as a waveguide on which electromagnetic signals can be transmitted.
  • the probe leads the signals into the container and out signals reflected on a product surface. For example, a transit time of the electromagnetic signals is determined and the fill level is determined therefrom.
  • Both a single waveguide and two or more waveguides arranged parallel to one another can serve as waveguides, which extend downwards into the container from a point above the highest fill level to be measured.
  • Suitable waveguides are e.g. bare metal wires, also known as Sommerfeld conductors, or metal wires provided with insulation. The latter are also known as the Goubau probe.
  • An electronic circuit for generating electromagnetic signals and a receiving and evaluation circuit for determining a level is e.g. described in EP-A 780 665.
  • the probe can e.g. also be a capacitive level probe.
  • the probe forms a capacitor together with the container, the capacitance of which is a measure of the current fill level.
  • the invention can be used completely analogously for such level measuring devices. For the sake of simplicity, however, the invention is only explained in more detail below together with the first-mentioned example of the waveguide.
  • Level gauges working with probes protruding into the container are used in a variety of applications, both in warehousing and in the processing industry, e.g. can be used in chemistry, in the food industry and in the oil industry.
  • the probe projects into the container and is at least partially submerged in the medium.
  • sticky and / or tough Media can deposit material on the probe.
  • Such deposits which are referred to in the industry as an attachment, can lead to a portion of the electromagnetic signal being reflected at the attachment in the former probe. This part is no longer available as a useful signal, so that the signal-to-noise ratio deteriorates. In the worst case, a reflection at the base is incorrectly interpreted as a reflection at the product surface.
  • the invention consists in a level measuring device for measuring a level of a filling material in a container by means of electromagnetic signals, which comprises:
  • the vibration exciter is arranged in the housing.
  • the vibration exciter acts on the probe perpendicular to a longitudinal axis of the probe.
  • the vibration exciter acts on the probe parallel to a longitudinal axis of the probe.
  • the vibration exciter is a piezoelectric exciter. According to a second embodiment of the first embodiment, the vibration exciter works in the ultrasound range.
  • the vibration exciter generates a vibration of the probe during operation by means of hammer blows.
  • the vibration exciter has a coil arranged coaxially with the probe and a ring coaxially surrounding the probe.
  • the ring can be deflected by the coil parallel to the longitudinal axis of the probe and the probe has at least one shoulder surface on which the ring can strike.
  • the probe is a waveguide, which leads electromagnetic signals into the container and signals reflected from a surface of the filling material out of the container.
  • the invention consists in a method for operating one of the aforementioned level measuring devices, in which the vibration exciter periodically sets the probe in vibration during operation.
  • the vibration exciter excites the probe once in operation in each period and the oscillation generated thereby is waited for.
  • the vibration exciter excites the probe to vibrate at a predetermined frequency for a fixed period of time during operation.
  • Fig. 1 shows a schematic representation of a level measuring device arranged on a container
  • Fig. 2 shows a schematic representation of a level measuring device with a vibration exciter
  • FIG. 3 shows a schematic illustration of a vibration exciter with piezoelectric elements arranged in a stack
  • Fig. 4 shows a schematic representation of a vibration exciter with an ultrasonic transducer
  • Fig. 5 shows a schematic representation of a
  • FIG. 6 shows a schematic illustration of a vibration exciter with a ring acting on the probe parallel to the longitudinal axis of the probe.
  • FIG. 1 shows a schematic illustration of a fill level measuring device 3 arranged on a container 1. It is used to measure a fill level of a filling material 5 in the container 1 and has an electronic circuit 7 for generating electromagnetic signals S.
  • the fill level measuring device comprises a probe 9 projecting into the container 1, which leads the signals S into the container 1 and out signals R reflected on a product surface.
  • the probe 9 is, for example, a mechanically rigid rod or a mechanically rigid wire.
  • a tensioned rope can also be used in the same way, one end of which is attached to a bottom of the container 1.
  • a weight can also be attached to the other end, through which the rope is tensioned.
  • It can be bare rods, wires or ropes made of metal, such as stainless steel, or with insulation provided metal wires, rods or ropes are used.
  • Polytetrafluoroethylene (PTFE) is a suitable insulator.
  • the reflected signals R are fed to a receiving and evaluation circuit 10, which e.g. the level in the container 1 is determined from a transit time of the signals S to the product surface and the reflected signals R from the product surface back.
  • the speed of propagation of the electromagnetic signals S, R and the distances between the electronic circuit 7 and the container bottom and between the receiving and evaluation circuit 10 and the container bottom are either known in any case or can be obtained by simple reference measurements. With this data, the level of the fill level results from the measured runtime. A measurement result is accessible via connection lines 11 for further processing, display and / or evaluation.
  • the probe 9 is fastened in a housing 13 which can be mounted on the container 1.
  • the housing 13 is made of an electrically conductive material, e.g. made of a metal, preferably a stainless steel. 2 shows a section through the housing 13 and the probe 9 fastened therein.
  • the housing 13 has essentially the shape of a hollow cylinder.
  • a thread 15 is formed on the outside of a container-facing lower end of the housing 13, by means of which the housing 13 can be screwed into an opening 17 in the container 1.
  • a first insert 19 made of a dielectric is arranged in the housing 13, through which the probe 9 is guided into the container 1.
  • the insert 19 has a conical outer jacket surface facing the container, with which it rests in a sealing manner on a conically shaped inner jacket surface 21 of the housing 13.
  • An inner diameter of the housing 13 decreases along the lateral surface 21 in the direction facing the container, so that movement of the first insert 19 in the direction of the container is prevented.
  • a cylindrical housing section 23 adjoins the section of the housing 13 having the lateral surface 21 in the direction facing the container. Inside this housing section 23, the first insert 19 tapers in the direction facing the container until it ends at the probe 9.
  • the probe 9 has a head 25 arranged in the interior of the housing 13 with a container-facing conical first lateral surface 27, the outside diameter of which decreases in the container-facing direction, and a container-facing conical second lateral surface 29, the outside diameter of which decreases in the container-facing direction , on. It lies with the conical lateral surface 27 facing the container in a sealing manner on an inner surface of the same shape as the first insert 19, so that movement of the probes 9 in the direction facing the container is prevented.
  • An elastic molded part 31 clamped parallel to a longitudinal axis L of the probe 9 is provided, which rests on the housing 13 and the probe 9 in a sealing manner.
  • the molded part 31 surrounds the probe 9 coaxially and has an inner surface of the same shape as the second conical outer surface 29 of the probe 9, with which it rests on the second conical outer surface 29.
  • the molded part 31 also has a conical outer jacket surface 33 facing the container, with which it rests on an inner jacket surface of the same shape as the first insert 19.
  • the molded part 31 lies with a cylindrical outer lateral surface 35 on an inner wall of the housing 13 of the same shape.
  • An inner surface 43 of the molded part 41 delimiting the recess 41 in the direction away from the container is cylindrical and an outer jacket surface 45 of the molded part 41 facing away from the container is conical, its outer diameter decreasing in the direction away from the container.
  • a second insert 47 is provided in the housing 13 and closes the end of the housing 13 in the direction facing away from the container.
  • the second insert 47 is made of metal and is cylindrical on the outside. It has a central axial bore 49, into which an extension 51 of the probe 9 projects. Extension 51 and bore 49 are preferably shaped so that in the bore 49 from the side facing away from the container ago a standard plug, for example a BNC plug, can be inserted for the connection of commercially available coaxial lines in order to connect the probe 9 via its extension 51 and the coaxial line to the electronic circuit 7.
  • the metallic second insert 47 and the electrically conductive housing 13 form an extension of an outer conductor of the coaxial line.
  • the second insert 47 has a conical outer surface 53 facing the container, the inside diameter of which increases in the direction facing the container until it is at the end equal to the inside diameter of the housing 13.
  • the second insert 47 lies with an outer, rotationally symmetrical section of this lateral surface 53 on the lateral surface 45 of the molded part 31 facing away from the container.
  • the molded part 31 is clamped by the first and the second insert 19, 47.
  • the second insert 47 in the exemplary embodiment shown in FIG. 2 has an external thread 55 with which it is screwed into an internal thread of the housing 13 in the direction facing the container.
  • a stop 57 is provided, up to which the insert 47 is to be screwed in so that it exerts sufficient pressure on the molded part 31.
  • a vibration exciter 59 which serves to set the probe 9 into mechanical vibrations during operation.
  • the vibration exciter 59 is arranged in the housing 13. It is preferably located in a container-facing section of the housing 13 away from the connection of the probe 9 to the coaxial line. In the exemplary embodiment shown in FIG. 2, it is located in a cylindrical section of the housing 13 located on a side of the head 25 of the probe 9 facing the container.
  • FIGS. 3 to 6 show exemplary embodiments of vibration exciters 59. In the embodiments shown in FIGS. 1 to 5, the vibration exciter acts on the probe 9 perpendicular to a longitudinal axis L of the probe 9. In the embodiment shown in FIG. 6, it acts parallel to the longitudinal axis L of the probe 9.
  • a piezoelectric exciter 61 is provided. These are disk-shaped piezoelectric elements 63 arranged in a stack, which are electrically parallel and are mechanically connected in series. The stack is arranged perpendicular to a longitudinal axis L of the probe 9 and the exciter acts on the probe 9 perpendicular to this longitudinal axis. By simultaneously changing their thickness due to an applied voltage, the piezoelectric elements 63 exert a force on the probe 9.
  • the stack is fixed between the housing 13 and the probe 9.
  • the stack can e.g. be glued in or, as shown in FIG. 1, be fastened in a holder 65.
  • insulation 67 e.g. a ceramic disk is provided, through which the stack is insulated from the probe 9 and the housing 13.
  • Fig. 4 shows an embodiment of a vibration exciter that works in the ultrasonic range. It is an ultrasonic transducer 69, e.g. a piezoelectric element is provided and pressed against the probe 9 by means of a spring 71. The spring 71 is fastened in a holder 73 mounted on the housing 13.
  • an ultrasonic transducer 69 e.g. a piezoelectric element is provided and pressed against the probe 9 by means of a spring 71.
  • the spring 71 is fastened in a holder 73 mounted on the housing 13.
  • the vibration exciter generates a vibration of the probe 9 during operation by means of hammer blows.
  • a hammer 77 is mounted on a carrier 75 and is rotatably mounted on a joint.
  • the hammer 77 has a bar magnet 79 and can be deflected from its rest position against the force of a spring 83 by means of an electromagnet 81.
  • the electromagnet 81 is arranged opposite the bar magnet 79 and fastened to the housing 13 by means of a holder 85.
  • the hammer 77 is removed from the probe 9 or it strikes the probe 9, reinforced by the reactive force of the spring 83.
  • FIG. 6 shows a further exemplary embodiment of a vibration exciter.
  • This has a coil 87 arranged coaxially to the probe 9 in the housing 13.
  • the probe 9 is coaxially surrounded by a ring 89.
  • the ring 89 is enclosed by the coil 87 and can be deflected by the coil 87 parallel to the longitudinal axis L of the probe 9.
  • the probe 9 has at least one shoulder surface 91, 93 on which the ring 89 can strike. By striking the ring 89 on one of the shoulder surfaces 91, 93, the probe 9 is set in vibration.
  • the shoulder surfaces 91, 93 are part of the probe 9.
  • the probe 9 has a smaller diameter in the section enclosed by the coil 87. At both ends of the section there is a step surface 91, 93 on which the ring 89 can strike due to a sudden transition to a larger diameter.
  • the coil 87 can be used, for example, to hurl the ring 89 against the shoulder surface 91 and then to hurl it by reversing the polarity of the coil 87 against the other shoulder surface 93.
  • the coil 87 can only accelerate the ring 89 in one direction.
  • a restoring force can e.g. be provided by gravity or by a spring, not shown in Fig. 6.
  • the probe 9 is set in vibration by the vibration exciter 59 during operation.
  • Periodic excitations are carried out by the vibration exciter 59 exciting the probe 9 once in each period and waiting for the vibration generated thereby to subside.
  • the vibration exciter 59 can excite the probe 9 in each period for a fixed period to vibrate at a predetermined frequency.
  • an oscillation excitation in the direction of the longitudinal axis L is also possible, which is effected by a pulse wave triggered by magnetostriction, which continues in the longitudinal direction through the probe.
  • the oscillation or the vibration of the probe 9 loosens and shakes off any attachment that may adhere to the probe 9, for example a dried-on layer of the medium. Accordingly, in this very simple manner, the probe 9 can be kept free of deposits, at least for a large number of batch-forming media. As a result, the measurement reliability is increased and complex cleaning and / or maintenance work can be carried out at much longer intervals or even be omitted entirely.

Landscapes

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

Abstract

Appareil de mesure du niveau d'une matière de remplissage (5) dans une cuve, sur lequel se forme le moins de dépôt possible. Ledit appareil comporte au moins une sonde (9) qui fait saillie dans l'intérieur de la cuve (1) et qui est fixée dans un boîtier (13) destiné à être monté sur la cuve (1), et un oscillateur (59) qui sert à conférer une oscillation mécanique à la sonde (9).
PCT/EP2002/014032 2001-12-17 2002-12-11 Appareil de mesure de niveau Ceased WO2003052360A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002358666A AU2002358666A1 (en) 2001-12-17 2002-12-11 Filling level measuring device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001162043 DE10162043A1 (de) 2001-12-17 2001-12-17 Füllstandsmeßgerät
DE10162043.8 2001-12-17

Publications (1)

Publication Number Publication Date
WO2003052360A1 true WO2003052360A1 (fr) 2003-06-26

Family

ID=7709582

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/014032 Ceased WO2003052360A1 (fr) 2001-12-17 2002-12-11 Appareil de mesure de niveau

Country Status (3)

Country Link
AU (1) AU2002358666A1 (fr)
DE (1) DE10162043A1 (fr)
WO (1) WO2003052360A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1643221A1 (fr) * 2004-09-29 2006-04-05 Siemens Milltronics Process Instruments Inc. Mécanisme de nettoyage vibrant pour une antenne dans un système de mesure du niveau basé sur le temps de vol
WO2008006391A1 (fr) * 2006-07-13 2008-01-17 Siemens Aktiengesellschaft Convertisseur de mesure de niveau selon le principe du radar et dispositif de diagnostic
WO2012013422A1 (fr) * 2010-07-28 2012-02-02 Endress+Hauser Gmbh+Co.Kg Dispositif de détermination et/ou de surveillance d'un niveau de remplissage prédéfini

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10328296A1 (de) 2003-06-23 2005-01-20 Endress + Hauser Gmbh + Co. Kg Ansatzalarm bei Feldgeräten
DE102004059050B4 (de) * 2004-12-07 2014-07-17 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Bestimmung und/oder Überwachung mindestens einer Prozessgröße
DE102013113253A1 (de) * 2013-11-29 2015-06-03 Endress + Hauser Flowtec Ag Thermisches Durchflussmessgerät und Verfahren zum Betreiben eines thermischen Durchflussmessgerätes
DE102014209734A1 (de) * 2014-05-22 2015-11-26 BSH Hausgeräte GmbH Trockner mit interner Reinigung eines Wasserstandssensors sowie Verfahren zu dessen Betrieb
DE102018222339A1 (de) * 2018-12-19 2020-06-25 Robert Bosch Gmbh Vorrichtung zur Bestimmung eines Füllstandes eines Behälters zur Aufnahme einer Flüssigkeit sowie ein Behälter mit solch einer Vorrichtung
DE102019105302A1 (de) * 2019-03-01 2020-09-03 Vega Grieshaber Kg Grenzstandsensor für anhaftende Medien und Verfahren zum Betreiben eines solchen Grenzstandsensors

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4693732A (en) * 1987-02-19 1987-09-15 Martin Engineering Company Piston vibrator
EP0426622A1 (fr) * 1989-09-26 1991-05-08 ITAL IDEE s.r.l. Appareil pour la mesure du contenu relatif de réservoirs contenant des liquides avec caractéristiques électriques différentes
DE19905926A1 (de) * 1999-02-12 2000-08-17 Siegfried Hillenbrand Vorrichtung zur Verfahrenskontrolle in zu befüllenden Behältern

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4201360C2 (de) * 1992-01-20 1995-04-27 Uwt Apparate Gmbh Einrichtung zur Füllstandsmessung
DE4320411C2 (de) * 1993-06-22 1998-07-23 Pepperl & Fuchs Vorrichtung zum Feststellen des Erreichens eines vorgegebenen Füllstandes mit einem Schwingstab
DE4327167C2 (de) * 1993-08-13 1996-07-04 Grieshaber Vega Kg Verfahren und Vorrichtung zum Feststellen eines vorbestimmten Füllstandes in einem Behältnis
DE19651362C1 (de) * 1996-12-10 1998-06-10 Endress Hauser Gmbh Co Vorrichtung zur Überwachung eines vorbestimmten Füllstands in einem Behälter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4693732A (en) * 1987-02-19 1987-09-15 Martin Engineering Company Piston vibrator
EP0426622A1 (fr) * 1989-09-26 1991-05-08 ITAL IDEE s.r.l. Appareil pour la mesure du contenu relatif de réservoirs contenant des liquides avec caractéristiques électriques différentes
DE19905926A1 (de) * 1999-02-12 2000-08-17 Siegfried Hillenbrand Vorrichtung zur Verfahrenskontrolle in zu befüllenden Behältern

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1643221A1 (fr) * 2004-09-29 2006-04-05 Siemens Milltronics Process Instruments Inc. Mécanisme de nettoyage vibrant pour une antenne dans un système de mesure du niveau basé sur le temps de vol
WO2008006391A1 (fr) * 2006-07-13 2008-01-17 Siemens Aktiengesellschaft Convertisseur de mesure de niveau selon le principe du radar et dispositif de diagnostic
WO2012013422A1 (fr) * 2010-07-28 2012-02-02 Endress+Hauser Gmbh+Co.Kg Dispositif de détermination et/ou de surveillance d'un niveau de remplissage prédéfini
CN103038612A (zh) * 2010-07-28 2013-04-10 恩德莱斯和豪瑟尔两合公司 用于确定和/或监控预定料位的设备
US9377343B2 (en) 2010-07-28 2016-06-28 Endress + Hauser Gmbh + Co. Kg Apparatus for determining and/or monitoring a predetermined fill level
CN103038612B (zh) * 2010-07-28 2016-08-03 恩德莱斯和豪瑟尔两合公司 用于确定和/或监控预定料位的设备

Also Published As

Publication number Publication date
DE10162043A1 (de) 2003-06-26
AU2002358666A1 (en) 2003-06-30

Similar Documents

Publication Publication Date Title
DE3931453C1 (fr)
DE1773815C3 (de) Vorrichtung zur Feststellung des Erreichens eines vorbestimmten Füllstands in einem Behälter
EP0644999B1 (fr) Indicateur de niveau
DE2839634C2 (de) Flüssigkeitsstand-Meßgerät
DE2906704A1 (de) Ultraschalltransponder
DE4118793A1 (de) Vorrichtung zur feststellung und/oder ueberwachung eines vorbestimmten fuellstandes in einem behaelter
WO2011032793A1 (fr) Appareil de mesure de niveau de remplissage
EP4111144B1 (fr) Multi-capteur vibronique
EP3084367A1 (fr) Bobine
WO2003052360A1 (fr) Appareil de mesure de niveau
DE10014348A1 (de) Verfahren und Vorrichtung zur zerstörungsfreien Messung der Dicke dünner Schichten
EP3665445A1 (fr) Bobine et convertisseur de mesure doté d'une telle bobine
WO1995027895A1 (fr) Procede permettant de mesurer un milieu a plusieurs constituants ou a plusieurs phases en circulation
DE2749077C2 (de) Messfühler
EP1004858A1 (fr) Jauge de niveau de remplissage
DE69207859T2 (de) Hochfrequenz akustisches Rheometer, und dieses Rheometer verwendende Vorrichtung zur Messung der Viskosität eines Fluides
EP0875739B1 (fr) Dispositif pour la détermination et/ou la surveillance d'un niveau prédéterminé dans un réservoir
DE102011088304B4 (de) Vorrichtung zur Bestimmung und/oder Überwachung mindestens einer Prozessgröße
EP1026492A2 (fr) Dispositif sans fil de mesure de couple et capteur pour ce dispositif
DE19930896A1 (de) Füllstands-Detekor für fließendes Material
EP1524504A3 (fr) Capteur de position à magnétostriction selon le principe de temps de propagation
DE102010003733A1 (de) Verfahren zur Detektion von Gasblasen in einem flüssigen Medium
DE19934876A1 (de) Füllstandsmeßsystem
EP0423143B1 (fr) Indicateur de niveau
DE102007003104B4 (de) Vorrichtung zur Bestimmung und/oder Überwachung von Prozessgrößen

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SC SD SE SG SK SL TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LU MC NL PT SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP