EP3580532A1 - Surveillance de l'état d'un capteur vibronique - Google Patents

Surveillance de l'état d'un capteur vibronique

Info

Publication number
EP3580532A1
EP3580532A1 EP18700417.1A EP18700417A EP3580532A1 EP 3580532 A1 EP3580532 A1 EP 3580532A1 EP 18700417 A EP18700417 A EP 18700417A EP 3580532 A1 EP3580532 A1 EP 3580532A1
Authority
EP
European Patent Office
Prior art keywords
sensor
unit
measured value
physical
ref
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Withdrawn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
EP18700417.1A
Other languages
German (de)
English (en)
Inventor
Thomas Vogt
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 EP3580532A1 publication Critical patent/EP3580532A1/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Withdrawn legal-status Critical Current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
    • G01F23/296—Acoustic waves
    • G01F23/2966—Acoustic waves making use of acoustical resonance or standing waves
    • G01F23/2967—Acoustic waves making use of acoustical resonance or standing waves for discrete levels
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/002—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis

Definitions

  • the invention relates to a method for condition monitoring of a vibronic sensor, which serves for determining and / or monitoring at least one, in particular physical or chemical, process variable of a medium in a container.
  • the vibronic sensor comprises a sensor unit with a mechanically oscillatable unit.
  • the process variable to be monitored can be given for example by the level of a medium in a container or the flow of a medium through a pipe, but also by the density, the viscosity, the ph value, the pressure, the conductivity or the temperature. Also optical sensors, such as turbidity or absorption sensors are known.
  • Vibronic sensors are widely used in process and / or process applications
  • level measuring devices they have at least one mechanically oscillatable unit, such as a tuning fork, a monobloc or a membrane. This is excited during operation by means of a drive / receiving unit, often in the form of an electromechanical transducer unit to mechanical vibrations, which in turn may be, for example, a piezoelectric actuator or an electromagnetic drive.
  • a drive / receiving unit often in the form of an electromechanical transducer unit to mechanical vibrations, which in turn may be, for example, a piezoelectric actuator or an electromagnetic drive.
  • the mechanically oscillatable unit can also be designed as a vibratable tube, which differs from the respective medium
  • Corresponding field devices are manufactured by the applicant in great variety and in the case of level measuring devices, for example, under the name LIQUIPHANT or
  • the drive / receiving unit can receive the mechanical vibrations of the mechanically oscillatable unit and convert it into an electrical reception signal.
  • the drive / receiving unit is either a separate drive unit and a separate receiver unit, or a combined drive / receiver unit.
  • the drive / receiving unit is in many cases part of a feedback electrical resonant circuit, by means of which the excitation of the mechanically oscillatable unit to mechanical vibrations takes place.
  • the Resonant circuit condition according to which the amplification factor is> 1 and all phases occurring in the resonant circuit give a multiple of 360 °, be satisfied.
  • phase shift between the start signal and the received signal to be ensured.
  • a predefinable value for the phase shift that is to say a setpoint value for the phase shift between the excitation signal and the received signal.
  • the adjustment of the phase shift can be carried out, for example, by using a suitable filter, or else by means of a control loop to a predefinable phase shift, the target value, are regulated.
  • a suitable filter or else by means of a control loop to a predefinable phase shift, the target value
  • Both the excitation signal and the received signal are characterized by their frequency ⁇ , amplitude A and / or phase ⁇ . Accordingly, changes in these quantities are usually used to determine the respective process variable, such as a predetermined level of a medium in a container, or the density and / or viscosity of a medium or the flow of a medium through a pipe.
  • the respective process variable such as a predetermined level of a medium in a container, or the density and / or viscosity of a medium or the flow of a medium through a pipe.
  • a vibronic level switch for liquids, for example, a distinction is made as to whether the oscillatable unit is covered by the liquid or vibrates freely. These two states, the free state and the covered state, are differentiated, for example, based on different resonance frequencies, ie a frequency shift.
  • the density and / or viscosity in turn can only be determined with such a measuring device if the oscillatable unit is covered by the medium.
  • the viscosity is based on one of two different values for the phase Frequency change determined, ie by means of a relative measurement. For this purpose, either two different phase values can be set and the associated frequency change can be determined, or a predetermined frequency band can be traversed and detected if at least two predetermined phase values are reached.
  • From DE10200704381 1 A1 is also known to close from a change in the natural frequency and / or resonance frequency and / or the phase position to a change in viscosity and / or due to appropriately stored dependencies of the oscillations of the oscillatory unit of the viscosity of the respective medium to determine the viscosity. In this procedure too, the dependence of the determination of the viscosity on the density of the medium must be taken into account.
  • DE10057974A1 has disclosed a method and a device by means of which the influence of at least one disturbing variable, for example the viscosity, on the oscillation frequency of the mechanically oscillatable unit can be determined and compensated accordingly .
  • at least one disturbing variable for example the viscosity
  • DE102006033819A1 is further described to set a predetermined phase shift between the excitation signal and the received signal, in which effects of changes in the viscosity of the medium to the mechanical vibrations of the mechanically oscillatable unit are negligible.
  • the density is essentially after the
  • DE102015102834A1 has disclosed an analytical measuring principle for determining the density and / or viscosity by means of a vibronic sensor which takes into account interactions between the oscillatable unit and the medium on the basis of a mathematical model.
  • the sensor is operated at two or more different predetermined phase shifts and determined from the respective response signal, the process variables density and / or viscosity.
  • various methods have become known from the prior art, by means of which statements about the state of the vibronic sensor can be made. From DE102005 is
  • a measuring device comprises at least one power measuring unit which monitors the energy requirement of the pickup / receiver unit at least in the case of resonant vibrations. This makes it possible to make a statement about the quality of the vibronic sensor. The higher the quality, the less energy is needed to excite resonant vibrations. Thus, if the energy requirement for excitation of resonance oscillations increases during a predefinable time period, or if the quality determined during the production of the sensor exceeds a predefinable limit value, then a defect, the presence of attachment in the region of the oscillatable unit or the like can be deduced.
  • a vibronic sensor with an electronic unit which comprises a phase measuring unit, an adjustable phase shifter and a Phaseneinstellech, which regulates the adjustment of the phase shift between the start signal and the received signal.
  • Control parameters can be updated and stored in predeterminable time intervals over the operating time of the sensor.
  • a condition monitoring can be performed based on a comparison between stored control parameters and current control data.
  • the present invention is therefore based on the object, a method for
  • the object is achieved by a method for condition monitoring of a vibronic sensor for determining and / or monitoring at least one process variable of a medium in a container, comprising at least one sensor unit with a mechanically oscillatable unit, comprising the following method steps:
  • the vibronic sensor is fundamentally characterized by various physical or chemical parameters, in particular parameters. Examples are the resonance frequency the oscillatory unit, or even the amplitude of the vibrations in the event that the sensor is not in contact with a medium. These variables can be determined in the installed state of the sensor during continuous operation. In addition, reference values for each of the characteristic physical or chemical quantities considered may be specified for the respective sensor, which values correspond to a desired value, for example. The setpoint corresponds to the value which the respective physical or chemical variable assumes when the sensor is fully functional.
  • condition monitoring is particularly advantageous because the status monitoring of the respective process, for which the sensor is used, does not have to be interrupted.
  • the condition monitoring can rather be carried out at any time, without the sensor having to be removed from the respective process for this purpose.
  • the time points at which the sensor is just certainly not in contact with the respective measuring medium can be selected for this purpose.
  • the method according to the invention also advantageously enables a predictive maintenance (English, predictive maintenance). For example, it can be estimated when a maintenance of the sensor is required on the basis of a respectively determined characteristic value measurement.
  • a deviation between the measured value and the reference value is determined, and the status indicator is determined on the basis of the deviation.
  • a statement about the state of the sensor can be generated if the deviation between the measured value and the reference value exceeds a predefinable limit value.
  • the at least one reference value is a value, in particular a measured value, of the physical and / or chemical quantity corresponding to the delivery state of the sensor.
  • different physical and / or chemical characteristics characteristic of the respective sensor are determined or measured.
  • differences in the respective characteristic physical and / or resulting differences due to customary manufacturing tolerances may occur chemical quantities are taken directly into account. A temporal change of these values then allows a statement about the condition of the sensor.
  • the at least one reference value and / or the at least one associated measured value for the physical and / or chemical quantity is / are stored in a data sheet.
  • the respective reference quantities can then be delivered together with the sensor to the respective customer, for example.
  • the respective data sheet can be requested for a sensor at any time in order to carry out a condition monitoring.
  • the data sheet preferably contains not only the reference values but also limit values for the permissible deviations of the respective measured values from the limit values.
  • the course over time of the characteristic physical and / or chemical parameters, in particular over the entire operating period of the vibronic sensor, can furthermore be recorded.
  • the course over time of the characteristic physical and / or chemical parameters in particular over the entire operating period of the vibronic sensor, can furthermore be recorded.
  • the data sheet can be created, for example, in the form of a table.
  • the data sheet can also be created in the form of a computer-readable file.
  • the at least one reference value and / or the at least one associated measured value for the physical and / or chemical quantity is / are stored in an Internet-based file or database. In this way, the reference value does not have to be supplied with the respective sensor. Rather, the
  • Reference value can be retrieved when needed. Also with respect to the measured values for the respective characteristic physical and / or chemical quantities is an Internet-based
  • the stored data can also be retrieved at the factory and evaluated to improve future generations of the sensors.
  • An embodiment of the method includes that the comparison of the measured value with the reference value is carried out at the location of the process. This is possible, for example, if the electronic unit has a suitable comparison algorithm. Either the
  • a further embodiment of the method includes that the at least one characteristic physical and / or chemical quantity is a frequency, in particular a resonant frequency, an amplitude, a phase between an excitation signal and a received signal, or a voltage, in particular a for the sensor characteristic voltage, such as a switching voltage acts.
  • the oscillatable unit is a membrane, a single rod or a tuning fork.
  • a particularly preferred embodiment includes generating as a status indicator a statement about the occurrence of approach, corrosion, abrasion, or a cable break, or about the ingress of moisture into at least one component of the sensor and / or output.
  • Approach, corrosion and / or abrasion concern in particular the
  • a further particularly preferred embodiment of the method finally includes that the at least one characteristic physical and / or chemical quantity is given by a resonant frequency of the sensor. In the case that the measured value is greater than the
  • Reference value, then as a condition indicator is a statement about a corrosion or abrasion in the range of the oscillatory unit, via an abrasion of a coating of
  • FIG. 2 shows a vibratable unit of a vibronic sensor in the form of a tuning fork.
  • a vibronic sensor 1 is shown. Shown is a sensor unit 3 with a vibratory unit 4 in the form of a tuning fork, which partially immersed in a medium 2, which is located in a container 2a.
  • the oscillatable unit 4 is excited by means of the pickup / receiving unit 5 to mechanical vibrations, and may be, for example, a piezoelectric stack or bimorph drive. It goes without saying, however, that too Other embodiments of a vibronic sensor fall under the invention.
  • an electronic unit 6 is shown, by means of which the signal detection, evaluation and / or - supply is carried out.
  • 2 shows an oscillatable unit 4 in the form of a tuning fork, as it is integrated, for example, in the vibronic sensor 1 marketed by the applicant under the name LIQUIPHANT, in a side view.
  • the tuning fork 4 comprises two to a membrane
  • the drive / reception unit 5 is an electromechanical conversion unit, and includes, for example, a piezoelectric element or an electromagnetic drive [not shown]. Either the drive unit 5 and the receiving unit are constructed as two separate units, or as a combined drive / receiving unit. In the case that the drive / receiving unit 5 comprises a piezoelectric element 9, the force impressed on the diaphragm 7 is generated by the application of a starting signal UA, for example in the form of an electrical alternating voltage.
  • a change in the applied electrical voltage causes a change in the geometric shape of the drive / receiving unit 5, ie a contraction or relaxation within the piezoelectric element such that the application of an electrical AC voltage as a start signal UA TO a vibration of the material fit with the drive / Receiving Unit 5 connected diaphragm 7 causes.
  • the mechanical vibrations of the oscillatable unit are transmitted via the membrane to the drive / receiving unit 5 and converted into an electrical received signal U e .
  • the respective process variable for example a predeterminable fill level of the medium 2 in the container 2 a, or also the density or viscosity of the medium 2, can then be determined on the basis of the received signal U e .
  • One possibility of condition monitoring of the vibronic sensor is explained below on the basis of a comparison of a measured frequency f of the oscillatable unit 4, in particular the resonant frequency fo of the sensor 1 with a corresponding reference value for the frequency f re f, fo.ref.
  • a condition monitoring can also be carried out on the basis of any other characteristic physical and / or chemical quantity for the vibronic sensor 1, for example the amplitude A, the phase ⁇ between the excitation signal UA and the received signal UE, or a voltage, in particular a characteristic of the sensor voltage, for example a
  • a measured value for the resonant frequency fo of the vibronic sensor 1 can be determined on the basis of the received signal UE. If necessary, continue to be different
  • Process parameters are, for example, the temperature T or the pressure p, or else the coverage state of the oscillatable unit 4.
  • the process conditions which at the time when the measured value for the frequency fo is recorded, correspond to the process conditions at the time of determining the reference value fo, re f
  • the frequency fo of the oscillatable unit 4 is, for example, temperature and
  • the reference values in this case thus the reference value for the resonant frequency fo, re f of the oscillatable unit 4 substantially at
  • Standard conditions ie determined at room temperature and normal pressure. Accordingly, it is also useful if the temperature T in the process when measuring the frequency fo in a range of about 20-30 ° C and in the process just neither an overpressure nor a negative pressure prevails.
  • characteristic curves or compensation functions can be used with respect to the dependence of individual characteristic quantities, such as the frequency fo of individual process conditions, such as the temperature T or the pressure p, in order to convert the respective measured values appropriately.
  • the resonant frequency is determined in the event that the vibratable unit 4 is not in contact with a medium, so that this condition monitoring condition would also ideally be met in terms of the frequency fo.
  • a statement about the state can then be generated. For example, a predefinable limit can be defined. If the deviation exceeds this limit value, then there may be a problem or the sensor requires maintenance.
  • the inventive method thus offers the possibility of predictive maintenance (English, predictive maintenance). For example, it may be pointed out that maintenance of the sensor or even a cleaning cycle for the oscillatable unit is pending, for example in the event that an approach has formed in the area of the oscillatable unit. It can also be a temporal
  • History of the measured value for the frequency fo are recorded and estimated, for example, based on the history of when such a maintenance and / or cleaning is to be performed.
  • an approach, in particular symmetrically distributed, in the region of the oscillatable unit 4 or corrosion in the area of the oscillatable unit 4 may be present. It may also be that an abrasion has occurred in the region of the oscillatable unit 4 or a coating of the oscillatable unit 4, or else that the oscillatable unit is defective, for example broken.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

La présente invention concerne un procédé pour surveiller l'état d'un capteur vibronique (1) afin de déterminer et/ou de surveiller au moins une grandeur de processus d'un milieu (2) dans un récipient (2a), au moyen d'au moins une unité de détection (3) dotée d'une unité (4) aptes aux oscillations mécaniques, le procédé comprenant les étapes suivantes consistant à : déterminer une valeur de mesure pour au moins une grandeur physique et/ou chimique (f, f0) caractéristique du capteur vibronique (1), alors que le capteur (1) se trouve sur/dans son emplacement d'utilisation ; comparer la valeur de mesure de la grandeur physique et/ou chimique (f, f0) à une valeur de référence de cette grandeur (fref, f0,ref) ; et déterminer un indicateur d'état à partir de la comparaison.
EP18700417.1A 2017-02-09 2018-01-15 Surveillance de l'état d'un capteur vibronique Withdrawn EP3580532A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017102550.2A DE102017102550A1 (de) 2017-02-09 2017-02-09 Zustandsüberwachung eines vibronischen Sensors
PCT/EP2018/050828 WO2018145858A1 (fr) 2017-02-09 2018-01-15 Surveillance de l'état d'un capteur vibronique

Publications (1)

Publication Number Publication Date
EP3580532A1 true EP3580532A1 (fr) 2019-12-18

Family

ID=60972234

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18700417.1A Withdrawn EP3580532A1 (fr) 2017-02-09 2018-01-15 Surveillance de l'état d'un capteur vibronique

Country Status (5)

Country Link
US (1) US20200116545A1 (fr)
EP (1) EP3580532A1 (fr)
CN (1) CN110268234B (fr)
DE (1) DE102017102550A1 (fr)
WO (1) WO2018145858A1 (fr)

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DE102020127077A1 (de) 2020-10-14 2022-04-14 Endress+Hauser SE+Co. KG Verfahren zum Betreiben eines vibronischen Sensors
EP4095500A1 (fr) * 2021-05-28 2022-11-30 Endress+Hauser Wetzer GmbH+CO. KG Thermomètre avec détection de vibrations
DE102021114584A1 (de) 2021-06-07 2022-12-08 Endress+Hauser Group Services Ag Verfahren zum Überwachen eines innerhalb eines Rohrleitungssystems vorherrschenden Zustands hinsichtlich einer Beeinträchtigung durch Ablagerung, Abrieb oder Korrosion
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CN104596610B (zh) * 2015-01-08 2017-08-11 深圳计为自动化技术有限公司 振动式料位开关及其振动装置
DE102015102834A1 (de) 2015-02-27 2016-09-01 Endress + Hauser Gmbh + Co. Kg Vibronischer Sensor

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WO2018145858A1 (fr) 2018-08-16
CN110268234A (zh) 2019-09-20
CN110268234B (zh) 2022-02-11
DE102017102550A1 (de) 2018-08-09
US20200116545A1 (en) 2020-04-16

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