WO2002031471A2 - Dispositif pour determiner et/ou controler la viscosite d'un fluide dans un reservoir - Google Patents

Dispositif pour determiner et/ou controler la viscosite d'un fluide dans un reservoir Download PDF

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Publication number
WO2002031471A2
WO2002031471A2 PCT/EP2001/010009 EP0110009W WO0231471A2 WO 2002031471 A2 WO2002031471 A2 WO 2002031471A2 EP 0110009 W EP0110009 W EP 0110009W WO 0231471 A2 WO0231471 A2 WO 0231471A2
Authority
WO
WIPO (PCT)
Prior art keywords
unit
viscosity
frequency
medium
oscillatable
Prior art date
Application number
PCT/EP2001/010009
Other languages
German (de)
English (en)
Other versions
WO2002031471A3 (fr
Inventor
Igor Getman
Sergej Lopatin
Original Assignee
Endress + Hauser Gmbh + 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 + Hauser Gmbh + Co. Kg filed Critical Endress + Hauser Gmbh + Co. Kg
Priority to DE20122541U priority Critical patent/DE20122541U1/de
Priority to EP01978323A priority patent/EP1325301A2/fr
Priority to AU2002210473A priority patent/AU2002210473A1/en
Priority to JP2002534806A priority patent/JP2004511771A/ja
Publication of WO2002031471A2 publication Critical patent/WO2002031471A2/fr
Publication of WO2002031471A3 publication Critical patent/WO2002031471A3/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
    • G01N11/16—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by measuring damping effect upon oscillatory body

Definitions

  • the invention relates to a device for determining and / or monitoring the viscosity of a medium in a container with an oscillatable unit, a lifting / receiving unit and a control / evaluation unit, the oscillatable unit being arranged in a defined measuring position within the container or wherein an oscillatable unit is attached such that it is immersed in the medium up to a defined immersion depth, and wherein the drive / receiver unit excites the oscillatable unit to oscillate, or wherein the drive / receiver unit vibrates the oscillatable unit receives.
  • vibration detectors for detecting or monitoring the fill level of a medium in a container
  • the vibrating element is usually at least one vibrating rod which is attached to a membrane.
  • the membrane is an electromechanical transducer, for. B. a piezoelectric element excited to vibrate. Due to the vibrations of the membrane, the vibrating element attached to the membrane also carries out vibrations.
  • a very well-known example of a vibration detector is the 'Liquiphant', which is manufactured and sold by the applicant.
  • Vibration detectors designed as level measuring devices take advantage of the effect that the oscillation frequency and the oscillation amplitude depend on the respective degree of coverage of the oscillation element: While the oscillation element can carry out its (resonance) oscillations freely and undamped in air, it experiences a change in frequency and amplitude , an upset as soon as it is partially or completely immersed in the medium. On the basis of a predetermined change in frequency (usually the frequency is measured for filling level detection), it is consequently possible to draw a clear conclusion that the predetermined filling level of the medium in the container has been reached. Level gauges are used primarily as overfill protection or for the purpose of pump idle protection. In addition, the damping of the vibration of the vibrating element is also influenced by the density of the medium. Therefore, with a constant degree of coverage, there is a functional relationship between the frequency change and the density of the medium, so that vibration detectors are ideally suited for determining both the fill level and the density.
  • the vibrations of the membrane are recorded and converted into electrical response signals by means of at least one piezoelectric element.
  • the electrical response signals are then evaluated by evaluation electronics.
  • the evaluation electronics monitor the oscillation frequency and / or the oscillation amplitude of the oscillation element and signal the status 'sensor covered' or 'sensor uncovered' as soon as the measured values fall below or exceed a predetermined reference value.
  • a corresponding message to the operating personnel can be made optically and / or acoustically.
  • a switching operation is triggered; for example, an inlet or outlet valve on the container is opened or closed.
  • the invention has for its object to use a vibration detector for determining and / or monitoring the viscosity of a medium in a container.
  • control / evaluation unit determines the viscosity of the medium on the basis of the frequency-phase curve of the oscillatable unit.
  • the present invention is based on the fact that the damping of an oscillatable unit depends on the viscosity of the medium with which it is in contact.
  • viscosity is the internal friction of a liquid, which is caused by attractive forces between the molecules.
  • the viscosity is highly dependent on the parameters of pressure and temperature.
  • the frequency-phase curves of an oscillatable unit that have been recorded in media with different viscosities differ significantly from one another - as can be clearly seen from the graphs shown in FIG. 1: the lower the viscosity of the medium, the steeper the frequency-phase curve drops. It has proven to be particularly advantageous Determine the viscosity of the medium based on the frequency change that occurs at two different phase values. It is therefore preferred not to perform an absolute measurement, but rather a relative measurement. As will be explained in more detail below, either two phase values are set and the associated frequency change is determined, or a predetermined frequency band is traversed and determined when at least two predetermined phase values are reached. The frequency change and the viscosity of the medium are determined from the frequencies corresponding to the phase values.
  • the viscosity is plotted against the frequency change with different phase shifts.
  • a logarithmic scale was chosen.
  • the advantage of measuring the frequency change instead of the absolute frequency measurement lies in an increased measuring accuracy and - as will be described in detail below - in the automatic elimination of disturbance variables, for example the density.
  • the frequency change for a given phase shift shows a clear dependence on the viscosity. Consequently, it is possible to determine the viscosity by determining the frequency difference for at least two predetermined phase values.
  • a piezo drive is used as the drive / receiver unit.
  • Piezo drives in In connection with the present invention can be used, for. B. from EP 0 985 916 A1.
  • the drive unit excites the oscillatable unit to oscillate in a predetermined oscillation mode, the oscillation mode preferably being the basic mode of the oscillatable unit.
  • control evaluation unit is assigned a memory unit in which data are stored which reflect the functional relationship between the frequency and the phase of the oscillations of the oscillatable unit with different damping ratios or with different viscosities.
  • the data can be characteristic curves, formulas or measured values.
  • the control evaluation unit preferably sets at least two sufficiently different phase values; The control / evaluation unit subsequently determines the frequencies assigned to the phase values or the corresponding frequency change in the vibrations of the oscillatable unit and determines the viscosity of the medium by comparing the previously determined frequency change and the stored data.
  • control evaluation unit selects the range in which the frequencies which are used to determine the viscosity are such that the functional relationship between the phase values and the frequencies is essentially linear.
  • control evaluation unit sets at least two frequencies that are different from one another; the phases associated with the frequencies of the vibrations of the oscillatable unit between the transmission and response signals then determined; In a last step, the control / evaluation unit determines the viscosity of the medium by comparing the determined phase values and the stored phase values.
  • control evaluation unit is assigned a signal generator which controls the drive unit in such a way that the oscillatable unit oscillates successively with different oscillation frequencies, the oscillation frequencies being within a selected frequency band (- frequency sweep) ,
  • the control / evaluation unit operates the oscillatable unit in a first operating mode as a limit switch and in a second operating mode as a viscosity sensor.
  • the respective operating mode is specified by a program contained in the control unit.
  • An input / output unit is preferably provided, via which settings are made on the device or via which information regarding the measured values which the device delivers is provided.
  • At least one bus line is provided for data exchange between the oscillatable unit and a remote control point.
  • the data exchange itself can be carried out using any transmission standard, e.g. B. Profibus PA, Fieldbus Foundation.
  • FIG. 5 shows a block diagram of the excitation circuit used in FIG. 4,
  • FIG. 7 shows a block diagram of a second embodiment of the device according to the invention.
  • Fig. 1 shows the representation of three frequency-phase curves of an oscillatable unit 2 in media with different damping coefficients ⁇ .
  • the turning point of the three curves lies at the resonance frequency fr, which is essentially determined by the rigidity of the membrane and the mass of the vibrating element.
  • fr the resonance frequency
  • the phase ⁇ between the drive signal and the response signal of the oscillatable unit 2 is 90 ° in the event of resonance.
  • damping coefficient ⁇ 1 damping coefficient
  • ⁇ 2 the phase change from 0 ° to 180 ° is more or less smooth.
  • the frequency-phase curves show a linear course within a certain frequency or phase range, the slope being dependent on the attenuation by the medium.
  • the influence of the density p is visualized on the basis of the frequency-phase curves of an oscillatable unit 2 shown in FIG. 3 in media with different densities p: Different densities p lead to a parallel shift of the frequency-phase curve along the frequency axis f , The higher the density p, the lower the oscillation frequency with the same phase value ⁇ . The shape of the curves themselves is almost identical in all cases. Since, according to the invention, no absolute values, but rather relative values (frequency changes or phase changes) are used for the evaluation of the viscosity ⁇ , the effect that a changing density p has on the measured values is automatically eliminated.
  • FIG. 4 shows a block diagram of a first embodiment of the device 1 according to the invention.
  • two predetermined phases ⁇ 1, ⁇ 2 are successively set between the drive signal and the response signal.
  • the two phase values ⁇ 1, ⁇ 2 are set via the excitation circuit 9, which will be described in detail below.
  • This first method of viscosity determination is very similar to the 'method as a predetermined filling level can be determined by a vibration detector to achieve.
  • an oscillatable unit 2 is a universal sensor for level, density and / or viscosity measurement.
  • the fill level is usually determined by monitoring the resonance frequency fr.
  • the oscillatable unit 2 is excited to vibrate via the piezoelectric excitation / reception unit, which in the case shown consists of a disk-shaped piezoelectric element 5, a drive electrode 6 and two reception electrodes 7.
  • the piezoelectric element 5 takes on the function of an interface between the mechanical parts, i.e. the membrane 4 and the vibrating elements 3, and the electronic parts, drive electrode 6 and receiving electrodes 7, of the vibratable unit 2: on the one hand, the piezoelectric element 5 sets an electric drive signal mechanical vibrations around; on the other hand, it converts mechanical vibrations into an electrical response signal.
  • a so-called stack drive can also be used instead of a disk-shaped piezoelectric element 5, a so-called stack drive can also be used.
  • FIG. 5 shows a block diagram of the excitation circuit 9 used in FIG. 4.
  • the excitation circuit 9 has several functions: it picks up the received signal Rx at the receiving electrodes 7.
  • the response signal Rx is passed through the bandpass filter 13.
  • the bandpass filter 13 preferably has a very small bandwidth, so that only the desired frequencies or the desired frequency are or are present at the output of the bandpass filter 13.
  • the filtered response signal Rx is then fed to the amplifier 14 and amplified.
  • two constant phase values ⁇ 1, ⁇ 2 are set in the phase shifter 15.
  • the response signal is fed back to the drive electrode 6 as the drive signal Tx and excites the oscillatable unit 2 to oscillate with the respectively set phase value ⁇ 1; ⁇ 2 on.
  • the response signal Rx passes from the excitation circuit 9 to the microprocessor 10, which for each phase value ⁇ 1; ⁇ 2 the corresponding frequency f1; f2 determined.
  • the determined viscosity ⁇ of the medium can be brought to the operator's knowledge, for example, via the input / display unit 12. Of course, it is also possible to use the determined viscosity value to control actuators.
  • the frequency f is changed within predetermined frequency bands; the oscillatable unit 2 is thus driven with different frequencies (- frequency sweep). Different phase values are assigned to the different frequencies.
  • the continuous traversal of certain frequency ranges is shown graphically in FIG. 6.
  • FIG. 7 shows a block diagram of this second embodiment of the device 1 according to the invention.
  • the oscillatable unit 2 is excited by a signal generator 19 with drive signals Tx of a predetermined frequency and preferably a predetermined amplitude.
  • the drive signals Tx are fed to a signal adaptation unit 18, which processes the signals in such a way that they can be read by the receiving unit 21.
  • the receiving unit 21 thus receives the response signals Rx of the oscillatable unit 2; a phase meter 22 determines the corresponding phase shift between the drive signal and the response signal.
  • the control unit 20 is responsible for the entire process for determining the frequency change df: it carries out the phase comparison, controls the frequency of the signal generator 19 and finally calculates the corresponding frequency change df. Based on the determined frequency change df, the viscosity ⁇ of the medium is subsequently determined in the converter 23. Stored table values, characteristic curves or formulas are used for this. LIST OF REFERENCE NUMBERS

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Control Of Non-Electrical Variables (AREA)

Abstract

L'invention concerne un dispositif pour déterminer et/ou contrôler la viscosité d'un fluide dans un réservoir. Ce dispositif comprend une unité pouvant osciller (2), une unité d'entraînement / de réception (4, 5, 6) et une unité de régulation / évaluation (8). L'unité pouvant osciller (2) est placée dans une position de mesure définie à l'intérieur du réservoir, ou une unité pouvant osciller (2) est installée de telle sorte qu'elle plonge dans le fluide jusqu'à une profondeur d'immersion définie, et l'unité d'entraînement / de réception (4, 5) génère les oscillations de l'unité pouvant osciller (2) ou l'unité d'entraînement / de réception (4, 6) reçoit les oscillations de l'unité pouvant osciller (2). L'objectif de l'invention est d'implanter un détecteur de vibrations permettant de déterminer et/ou de contrôler la viscosité (θ) d'un fluide dans un réservoir. A cet effet, l'unité de régulation / évaluation (8) détermine la viscosité (θ) du fluide à l'aide de la courbe fréquence / phase (? = g(f)) de l'unité pouvant osciller (2).
PCT/EP2001/010009 2000-10-10 2001-08-30 Dispositif pour determiner et/ou controler la viscosite d'un fluide dans un reservoir WO2002031471A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE20122541U DE20122541U1 (de) 2001-08-30 2001-08-30 Vorrichtung zur Bestimmung und/oder Überwachung der Viskosität eines Mediums in einem Behälter
EP01978323A EP1325301A2 (fr) 2000-10-10 2001-08-30 Dispositif pour determiner et/ou controler la viscosite d'un fluide dans un reservoir
AU2002210473A AU2002210473A1 (en) 2000-10-10 2001-08-30 Device for determining and/or monitoring the viscosity of a medium in a container
JP2002534806A JP2004511771A (ja) 2000-10-10 2001-08-30 容器内の媒体の粘度を測定及び／又は監視する装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000150299 DE10050299A1 (de) 2000-10-10 2000-10-10 Vorrichtung zur Bestimmung und/oder Überwachung der Viskosität eines Mediums in einem Behälter
DE10050299.7 2000-10-10

Publications (2)

Publication Number Publication Date
WO2002031471A2 true WO2002031471A2 (fr) 2002-04-18
WO2002031471A3 WO2002031471A3 (fr) 2002-10-10

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Country Status (6)

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EP (1) EP1325301A2 (fr)
JP (1) JP2004511771A (fr)
CN (1) CN1468370A (fr)
AU (1) AU2002210473A1 (fr)
DE (1) DE10050299A1 (fr)
WO (1) WO2002031471A2 (fr)

Cited By (3)

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DE10237931A1 (de) * 2002-08-14 2004-02-26 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Überwachung eines vorbestimmten Füllstands eines Messmediums in einem Behälter
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DE102021129416A1 (de) 2021-11-11 2023-05-11 Endress+Hauser SE+Co. KG Zustandsüberwachung für einen vibronischen Sensor
DE102022115592A1 (de) 2022-06-22 2023-12-28 Endress+Hauser SE+Co. KG Modularer vibronischer Multisensor
DE102022115591A1 (de) 2022-06-22 2023-12-28 Endress+Hauser SE+Co. KG Modularer vibronischer Multisensor
DE102022115594A1 (de) 2022-06-22 2023-12-28 Endress+Hauser SE+Co. KG Modularer vibronischer Multisensor

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10237931A1 (de) * 2002-08-14 2004-02-26 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Überwachung eines vorbestimmten Füllstands eines Messmediums in einem Behälter
WO2014095418A1 (fr) 2012-12-21 2014-06-26 Endress+Hauser Gmbh+Co. Kg Procédé de détermination et/ou de surveillance d'au moins un paramètre dans la technique d'automatisation
DE102012113045A1 (de) 2012-12-21 2014-06-26 Endress + Hauser Gmbh + Co. Kg Verfahren zur Bestimmung und oder Überwachung von zumindest einem Parameter in der Automatisierungstechnik
US9971855B2 (en) 2012-12-21 2018-05-15 Endress + Hauser Gmbh + Co. Kg Method for determining and or monitoring at least one parameter in automation technology
DE102012113045B4 (de) 2012-12-21 2023-03-23 Endress+Hauser SE+Co. KG Verfahren zur Bestimmung und oder Überwachung von zumindest einem Parameter in der Automatisierungstechnik
DE102013106172A1 (de) 2013-06-13 2014-12-18 Endress + Hauser Gmbh + Co. Kg Verfahren zur Kalibration oder zum Abgleich einer beliebigen schwingfähigen Einheit
US10078005B2 (en) 2013-06-13 2018-09-18 Endress + Hauser Gmbh + Co. Kg Method for calibration or adjustment of any oscillatable unit

Also Published As

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DE10050299A1 (de) 2002-04-11
WO2002031471A3 (fr) 2002-10-10
JP2004511771A (ja) 2004-04-15
CN1468370A (zh) 2004-01-14
AU2002210473A1 (en) 2002-04-22
EP1325301A2 (fr) 2003-07-09

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