WO2008006391A1 - Convertisseur de mesure de niveau selon le principe du radar et dispositif de diagnostic - Google Patents

Convertisseur de mesure de niveau selon le principe du radar et dispositif de diagnostic Download PDF

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Publication number
WO2008006391A1
WO2008006391A1 PCT/EP2006/006872 EP2006006872W WO2008006391A1 WO 2008006391 A1 WO2008006391 A1 WO 2008006391A1 EP 2006006872 W EP2006006872 W EP 2006006872W WO 2008006391 A1 WO2008006391 A1 WO 2008006391A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
vibration
signal
evaluation device
mechanical
Prior art date
Application number
PCT/EP2006/006872
Other languages
German (de)
English (en)
Inventor
Martin Borrmann
Wolfgang Ens
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to PCT/EP2006/006872 priority Critical patent/WO2008006391A1/fr
Publication of WO2008006391A1 publication Critical patent/WO2008006391A1/fr

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
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/02—Analysing fluids
    • G01N29/036—Analysing fluids by measuring frequency or resonance of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves

Definitions

  • the invention relates to a level transmitter according to the radar principle with an antenna for emitting a radar signal to the surface of a medium and for receiving a surface-reflected radar signal according to the preamble of claim 1 and a diagnostic device for detecting contamination of the antenna of such a level transmitter after Preamble of claim 5.
  • a particular problem with level measurement with microwaves is that dirt layers can attach to the antenna. This danger exists especially with dusty or powdery bulk solids, especially when the antenna becomes moist, as well as with sticky, viscous, spattering and stirred products. An excessively thick layer of dirt on the antenna can falsify the result of the level measurement or even make a measurement impossible. In order to exclude malfunction of the level transmitter, it is desirable to be able to detect contamination of the antenna at an early stage and timely appropriate measures to eliminate the pollution, for example, in a cyclical plant maintenance perform.
  • the current echo function which ⁇ represents the amplitudes of the received from the on ⁇ antenna echo waves as a function of the distance is to be compared with an undisturbed measurement corresponding stored echo function and deviations in the antenna region and to evaluate the adjacent to the antenna near range for detecting a buildup by contamination ⁇ tion.
  • this method of detecting soiling does not provide a sufficiently reliable diagnostic statement, since temperature as well as the type of product and the deposit on the antenna have a strong influence on the detectability of the contamination. It hastrege ⁇ assumed that the degree of contamination in particular, due to the diversity of the media to be measured can not be directly derived from the change of the echo function.
  • FIG. 1 Another level transmitter according to the radar principle is known from US 6 917 326 Bl.
  • a soiled microwave antenna For cleaning a soiled microwave antenna there is proposed to excite the antenna, such as a horn antenna, with a vibrator to mechanical vibrations. Due to these vibrations, dirt particles are released from the surface of the antenna and fall off. Drying is carried out cyclically at fixed intervals. Since it is not intended to detect the degree of antenna contamination, it may happen that the cleaning device is defective or the cleaning is incomplete. In this case, the transmitter may provide erroneous or no measurement results despite the automatic cleaning device. Faulty measurement results often go unnoticed, which can have a very disruptive effect on the operation of an automation system in which the level transmitter is used.
  • the invention has for its object to provide a level transmitter according to the radar principle and a diagnostic device with which a reliable statement about the state of contamination of the antenna can be made.
  • the invention has the advantage that contamination of the antenna can be detected particularly reliably by the diagnostic device with a vibration generator for exciting the antenna, a vibration sensor for detecting the self-adjusting mechanical vibration and an evaluation device for evaluating the vibration signal.
  • the physical effect is used that the pollution on the antenna changes the mechanical vibration behavior of the antenna. The predominant reason for this is the increase in the antenna mass around the mass of the contaminant deposited on the surface of the antenna.
  • the temperature, type of product and deposit have virtually no influence on the detectability of contamination.
  • the degree of contamination can be very accurately evaluated by the vibration signal.
  • the deposition influences the frequency, the amplitude and / or the damping of the resulting mechanical oscillation.
  • the new diagnostic device increases the operational reliability of an automation system in which a measuring transducer equipped with such a diagnostic device is used. Reliable detection of fouling of the antenna of a level transmitter, in fact, increases the reliability and availability of the level transmitter. It allows additional evaluation of the measurement signals provided by the level transmitter and can help prevent system failure.
  • the knowledge of the degree of contamination of the antenna enables a demand-based cleaning.
  • Automobile- Matic cleaning systems can thus be operated more energy efficient, since a cleaning only takes place when it requires the degree of contamination.
  • unnecessary maintenance for example, comprise an extension of the respective Gressmans.
  • the mechanical resonance frequency of the antenna can be determined and monitored for impermissible deviations. This has the advantage that an increase in mass due to dirt deposits has a direct effect on a shift in the mechanical resonance frequency and thus strongly influences it. A determination of the mechanical resonance frequency is also particularly easy metrologically feasible and requires no elaborate evaluation.
  • vibration signal for assessing the state of the antenna can be used in principle, for example, the attenuation of the vibration signal or the maximum amplitude after excitation by a pulse.
  • the diagnostic device is associated with a particularly low production cost if the vibration generator and the vibration sensor are realized by the same component, for example by an electromechanical component with a piezoceramic.
  • evaluation device for the diagnosis is designed as an integral part of the control and evaluation device for the antenna, which is used in the actual level measurement.
  • a Medstandsraessumformer 1 according to the radar comprises according to the figure, an antenna 2 for emitting a Radarsig ⁇ nals 3 to the surface 4 of a medium 5 and for receiving a surface 4 reflected radar signal 6 and a control and evaluation device 7 for the antenna 2 for determination
  • the fill level on the basis of the transmitted Radarsig ⁇ nals 3 and the received radar signal 6.
  • a measurement signal for the filling level and status information of the transmitter 1 can be exchanged via a fieldbus interface 8, for example, with a control station, which is not shown in the figure for clarity.
  • Such level transmitters are often installed as field devices of the process instrumentation in tanks or containers to determine their content.
  • a diagnostic device which comprises an electromechanical transducer 9 and an evaluation device 10.
  • the electromechanical transducer 9 has on the one hand the function of a vibration generator, which excites the antenna 2 to a mechanical vibration, and on the other hand, the function of a vibration sensor, with which detects the self-adjusting mechanical vibration and a corresponding vibration signal to the evaluation device 10th is generated.
  • the mechanical resonance frequency of the antenna 2 is determined based on the vibration signal.
  • a corresponding indication signal is output 11 to the control and evaluation device 7 and also a display signal 12 to a control unit 13 output.
  • the control and evaluation device 7 outputs when it detects an increased antenna pollution a corresponding status message on the field bus 8 from.
  • the message of a fault condition on a display of a control panel which is not shown in the figure for clarity, can be output locally on the transmitter 1, so that without undue delay appropriate measures for error removal, in this case cleaning of the antenna. 2 , can be initiated.
  • the controller 13 is caused to perform an antenna cleaning operation.
  • a mechanical actuator 14 for example an electromechanical hammer mechanism with a lifting magnet, is provided on the antenna 2.
  • the antenna 2 is excited to strong vibrations, so that the contamination is detached from the surface of the antenna 2 and drops. If the diagnostic device continues to detect excessive contamination of the antenna 2, a cleaning process can be triggered again.
  • the control and evaluation device 7, the evaluation device 10 and the controller 13 are combined in a control and evaluation device 15, which is implemented by a microcontroller with suitable programming.
  • the transducer 9 on the antenna 2 may be attached to the microwave conductor, a mounting flange or a transmitter housing of the transmitter, which are mechanically coupled to the antenna.
  • An attachment outside of a tank or container has the advantage that the converter is not in the contamination area of possibly aggressive media.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Pathology (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Immunology (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

L'invention concerne un convertisseur de mesure de niveau selon le principe du radar et un dispositif de diagnostic pour la reconnaissance de la saleté de l'antenne (2) d'un convertisseur de mesure de niveau (1). Le dispositif de diagnostic comprend un oscillateur (9) pour l'excitation de l'antenne en une oscillation mécanique, un capteur d'oscillation (9) pour la détection d'une oscillation mécanique et un module de calcul (10) permettant de déterminer une valeur d'une propriété caractéristique d'un signal d'oscillation et de produire un signal d'affichage (11, 12) si l'écart par rapport à une valeur de référence prédéterminée dépasse une valeur limite donnée. Cela permet d'établir un diagnostic de haute fiabilité concernant le degré de saleté de l'antenne (2).
PCT/EP2006/006872 2006-07-13 2006-07-13 Convertisseur de mesure de niveau selon le principe du radar et dispositif de diagnostic WO2008006391A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2006/006872 WO2008006391A1 (fr) 2006-07-13 2006-07-13 Convertisseur de mesure de niveau selon le principe du radar et dispositif de diagnostic

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2006/006872 WO2008006391A1 (fr) 2006-07-13 2006-07-13 Convertisseur de mesure de niveau selon le principe du radar et dispositif de diagnostic

Publications (1)

Publication Number Publication Date
WO2008006391A1 true WO2008006391A1 (fr) 2008-01-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/006872 WO2008006391A1 (fr) 2006-07-13 2006-07-13 Convertisseur de mesure de niveau selon le principe du radar et dispositif de diagnostic

Country Status (1)

Country Link
WO (1) WO2008006391A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008030976A1 (de) * 2008-06-30 2010-03-04 Siemens Aktiengesellschaft Antenne und Verfahren zur Reinigung einer Antenne
EP2188601A1 (fr) * 2007-09-04 2010-05-26 Enraf B.V. Procédé et dispositif de détermination du niveau l d'un liquide dans une plage de mesure définie au moyen de signaux radar transmis à la surface du liquide et de signaux radar réfléchis par la surface du liquide
CN104142169A (zh) * 2013-05-07 2014-11-12 Vega格里沙贝两合公司 带有清洗设备的填注水平检测装置
CN106164627A (zh) * 2014-05-02 2016-11-23 Vega格里沙贝两合公司 借助表面拓扑确定及旋转中心校正的物位测量
WO2017017076A1 (fr) * 2015-07-30 2017-02-02 Endress+Hauser Gmbh+Co. Kg Dispositif pour déterminer et/ou surveiller au moins une grandeur de processus
EP3199971A1 (fr) * 2016-01-28 2017-08-02 Endress + Hauser GmbH + Co. KG Dispositif de mesure de niveau

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003052360A1 (fr) * 2001-12-17 2003-06-26 Endress + Hauser Gmbh + Co.Kg Appareil de mesure de niveau
US6917326B1 (en) * 2004-09-29 2005-07-12 Siemens Milltronics Process Instruments Vibratory cleaning mechanism for an antenna in a time-of-flight based level measurement system
DE102004059050A1 (de) * 2004-12-07 2006-06-08 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Bestimmung und/oder Überwachung einer Prozessgröße

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003052360A1 (fr) * 2001-12-17 2003-06-26 Endress + Hauser Gmbh + Co.Kg Appareil de mesure de niveau
US6917326B1 (en) * 2004-09-29 2005-07-12 Siemens Milltronics Process Instruments Vibratory cleaning mechanism for an antenna in a time-of-flight based level measurement system
DE102004059050A1 (de) * 2004-12-07 2006-06-08 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Bestimmung und/oder Überwachung einer Prozessgröße

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2188601A1 (fr) * 2007-09-04 2010-05-26 Enraf B.V. Procédé et dispositif de détermination du niveau l d'un liquide dans une plage de mesure définie au moyen de signaux radar transmis à la surface du liquide et de signaux radar réfléchis par la surface du liquide
DE102008030976A1 (de) * 2008-06-30 2010-03-04 Siemens Aktiengesellschaft Antenne und Verfahren zur Reinigung einer Antenne
US9772211B2 (en) 2013-05-07 2017-09-26 Vega Grieshaber Kg Fill level gauge with a rinsing device
CN104142169A (zh) * 2013-05-07 2014-11-12 Vega格里沙贝两合公司 带有清洗设备的填注水平检测装置
EP2801798A1 (fr) * 2013-05-07 2014-11-12 VEGA Grieshaber KG Appareil de mesure du niveau de remplissage avec dispositif de rinçage
US20140332032A1 (en) * 2013-05-07 2014-11-13 Vega Grishaber Kg Fill level gauge with a rinsing device
CN106164627A (zh) * 2014-05-02 2016-11-23 Vega格里沙贝两合公司 借助表面拓扑确定及旋转中心校正的物位测量
CN106164627B (zh) * 2014-05-02 2019-11-19 Vega格里沙贝两合公司 物位测量装置和方法以及计算机可读介质
WO2017017076A1 (fr) * 2015-07-30 2017-02-02 Endress+Hauser Gmbh+Co. Kg Dispositif pour déterminer et/ou surveiller au moins une grandeur de processus
CN107850476A (zh) * 2015-07-30 2018-03-27 恩德莱斯和豪瑟尔两合公司 用于确定和/或监测至少一个过程变量的装置
EP3329227B1 (fr) * 2015-07-30 2020-04-15 Endress+Hauser SE+Co. KG Dispositif pour déterminer et/ou surveiller au moins une grandeur de processus
US11255714B2 (en) 2015-07-30 2022-02-22 Endress+Hauser Se+Co.Kg Apparatus for determining and/or monitoring at least one process variable
EP3199971A1 (fr) * 2016-01-28 2017-08-02 Endress + Hauser GmbH + Co. KG Dispositif de mesure de niveau

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