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EP1966569A2 - Dispositif de mesure de niveau de remplissage comprenant un interrupteur de securite qui intervient en cas de temperatures elevees - Google Patents

Dispositif de mesure de niveau de remplissage comprenant un interrupteur de securite qui intervient en cas de temperatures elevees

Info

Publication number
EP1966569A2
EP1966569A2 EP06829332A EP06829332A EP1966569A2 EP 1966569 A2 EP1966569 A2 EP 1966569A2 EP 06829332 A EP06829332 A EP 06829332A EP 06829332 A EP06829332 A EP 06829332A EP 1966569 A2 EP1966569 A2 EP 1966569A2
Authority
EP
European Patent Office
Prior art keywords
temperature
vibration
signal
arrangement
arrangement according
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Withdrawn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
EP06829332A
Other languages
German (de)
English (en)
Inventor
Adrian Frick
Siegbert Woehrle
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.)
Vega Grieshaber KG
Original Assignee
Vega Grieshaber 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 Vega Grieshaber KG filed Critical Vega Grieshaber KG
Publication of EP1966569A2 publication Critical patent/EP1966569A2/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Withdrawn legal-status Critical Current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
    • 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

Definitions

  • the invention relates to a vibration limit switch arrangement with the preamble features of claim 1 and to a method for operating a vibration ons limit switch with the Oberbegriffliehen features of patent claim 9.
  • a vibration limit switch assembly for monitoring a level of a medium in a container comprises a vibration assembly for generating a mechanical vibration.
  • the vibration arrangement is doing with a
  • Vibration device coupled, wherein the vibration device is designed to generate a to be transmitted to the vibration assembly mechanical vibration due to an electrical excitation signal.
  • the same vibration device is at the same time designed to convert a mechanical vibration transmitted by the vibration arrangement into an electrical reception signal.
  • the excitation signal is generated by a control device, wherein the control device preferably also serves to process the received signal.
  • a vibration limit switch usually consists of a piezoelectric transmitting / receiving unit in the form of such a vibration device and from a coupled thereto mechanical see vibration structure in the form of the vibration arrangement, which is preferably designed as a tuning fork.
  • the electrical drive energy of the transmitting unit is thereby converted into mechanical vibration energy, whereby the above-driven ⁇ ne vibrating structure begins to oscillate at its resonant frequency.
  • an electrical reception signal is received at the receiving unit formed by the vibrator. Frequency and amplitude of this sensor Capture signal are dependent on the coverage condition of the Schwingga ⁇ bel and thus the level of the container and can therefore be used for the evaluation.
  • the object of the invention is to propose a full-level measuring arrangement, in particular a vibration limit switch arrangement or a method for operating such an arrangement, which can be operated more safely.
  • a vibration limit switch arrangement is preferably provided with a control device for generating an electrical excitation signal and / or for processing an electrical reception signal, a vibration device, in particular a piezoelectric vibration device for generating a mechanical vibration on the basis of the excitation signal and / or for converting a mechanical vibration in the received signal and a vibration arrangement, wherein a temperature determination device for determining a temperature of the vibrator and / or a temperature of an environment of the vibrator is provided and wherein the control device is designed, a switching signal and / or a warning signal when reaching a threshold temperature or depending on the temperature.
  • the control device preferably has an output for outputting the switching signal for controlling a connected device, in particular filling or emptying device, and / or for displacing the vibration limit switch arrangement and / or a connected device m to a specially defined state.
  • the control device has preferential also has an output for outputting the warning signal for signaling a critical operating state.
  • a storage device preferably serves for storing at least one previously determined temperature for an analysis according to a fault state of the vibration limit switch arrangement or a higher-level device.
  • the temperature determination device preferably has a thermocouple with compensation lines for generating a thermal voltage.
  • a thermocouple with compensation lines for generating a thermal voltage.
  • thermoelectrodes with mutually different thermoelectric coefficients via insulated compensating lines whose thermoelectric coefficient of the individual cores coincides with the thermoelectrical electrode connected thereto or is in a defined ratio.
  • At least one thermal electrode of the temperature-determining device is at the same time designed and connected as a connection electrode for a piezo element of the vibration device.
  • a method is also preferred for operating a vibration limit switch, in which an excitation signal is generated and applied to a vibration device, wherein the vibration device generates a mechanical vibration, wherein a temperature of the vibration device and / or a temperature of an environment of the vibration device is determined and / or a switching signal and / or a warning signal is generated depending on the determined temperature or a threshold temperature.
  • the switching signal is preferably generated upon reaching a threshold temperature in order to set a further device for filling or emptying a monitored container in a defined state.
  • the warning signal is generated in particular when reaching a threshold temperature for signaling a critical operating state.
  • at least one previously determined temperature is preferably stored for analysis after a fault condition at a later time. From the temperature and a temperature value of a product of a monitored container can be determined.
  • the threshold temperature is set so far below the Curie temperature of the piezo material used that the vibration device can produce the mechanical vibration from the excitation signal and / or the received signal from the mechanical vibration trouble-free.
  • the threshold temperature is preferably less than 10%, in particular less than 5%, in particular less than 2% below the Curie temperature. This allows a safe use of a vibration device, which is formed by at least one piezoelectric element.
  • Device can be exceeded by introducing a critical threshold temperature below the Curie temperature by initiating preventive measures are prevented or a mechanism can be activated, which causes, for example, a shutdown of the entire system or activation or deactivation of certain devices such a system.
  • a critical threshold temperature below the Curie temperature
  • a mechanism can be activated, which causes, for example, a shutdown of the entire system or activation or deactivation of certain devices such a system.
  • a level detector equipped in such a way in a defined secure position, so that, for example, an overflow or dry running of a parent system is prevented.
  • Also useful is the output of a warning message when approaching the depolarization limit, so that if necessary countermeasures can be initiated in good time.
  • the storage of the maximum drive temperature by means of preferably a drag pointer in a storage device such as an EEPROM allows after a failure of a vibration limit switch arrangement or after any other disturbance the manufacturer or operator to limit the possible causes of failure of such a vibration limit switch arrangement ,
  • a temperature sensor of the temperature determination device is mounted in the immediate vicinity of the piezoelectric transmitting / receiving unit. If the specific temperature is transmitted to the control device or to a control center, then the control device or the control center or an operator can additionally use the opportunity to draw conclusions about the temperature of the full-medium of a monitored container with a small temperature difference between the drive and the product ,
  • cost-effective and space-saving sensor unit is suggested by the proposed arrangement and method with which it is possible the tempera ture ⁇ a piezo-actuator which is used for forming a vibration device to monitor.
  • the measuring device Preferably, the temperature is carried out by means of a heat resistance chain, which is placed directly in front of the temperature-sensitive elements.
  • a heat resistance chain which is placed directly in front of the temperature-sensitive elements.
  • One way of measuring the temperature would be the use of metallic temperature sensors, as they are known as PtIOO or PtIOOO, which change their electrical resistance via the temperature.
  • Such sensors take up a relatively large amount of space in a drive housing.
  • optimal placement is not easily accomplished because the most favorable location of the thermal conduction on a diaphragm of the vibrating structure of the vibrator or on an element metallically coupled thereto provides potential separation by means of e.g. a ceramic disc between a pressure plate and a piezoelectric block no longer guaranteed.
  • the temperature sensor of such a temperature-determining device should, however, be located as far as possible in the direction of a possible heat source between the heat source and piezoelectric elements. Therefore, an arrangement with electrodes having mutually different thermoelectric coefficients is particularly preferred.
  • FIG. 1 is a schematic side view of a vibration system and electronics of a vibration limit switch arrangement according to a first embodiment
  • Fig. 2 shows an arrangement according to a second embodiment
  • Fig. 3 shows an arrangement according to a third embodiment.
  • Fig. 1 shows a subdivision into a vibration system 1 and an electronics 2.
  • a mechanical vibration assembly 3 a common tuning fork is used.
  • the tuning fork protrudes at least partially into a container in which a filling medium is located, the level of which is to be monitored.
  • a sequence of components is arranged, which consists in the illustrated embodiment, only by way of example of individual components, which are stacked and braced by a threaded rod 4 and a nut 5 against the vibration assembly.
  • a threaded rod 4 and a nut 5 against the vibration assembly.
  • other known arrangements and methods for forming a vibration drive in conjunction with a vibration fork can be implemented.
  • the vibrating fork forming the oscillation arrangement 3 are a lower pressure disk 6, a ceramic element 7, a first thermoelectric electrode 8, a second thermoelectrode 9, a piezoelectric element 10, a first connecting electrode 11, a second Piezo element 12, a second connection electrode 13, a further ceramic element 14 and an upper pressure plate 15 arranged, which are clamped by the nut 5 against the tuning fork.
  • the electronics 2 comprises, in addition to further customary components, in particular a transmitting / receiving unit 16 and an ADW
  • the control device 19 can thus be formed from individual interconnected components or from an optionally also single integrated component.
  • An excitation signal s which is applied to the first connection electrode 11, is generated via the transmission / reception unit 16 of the control device 19.
  • the second connection electrode 13 is connected to ground m, the ground m being connected as circuit ground to the transmitting / receiving unit 16 or other customary ground connections.
  • the temperature determination device 17 is connected to the first thermoelectrode 8 via a first line and receives a thermal voltage t via this line.
  • the temperature determination device 17 is connected to ground via a ground line 21, the ground line 21 being applied to the second thermal electrode 9.
  • a common mass m may preferably be used with the transceiver unit 16.
  • a line 20 for the send / receive signal s, e and a separate ground line 21 for the drive unit and a separate line pair of its own ground line 21 and a thermo-voltage line 22 for Temperature determining device 17 to provide.
  • the illustrated ground line 21 and the thermo-voltage line 22 form thermal compensation lines.
  • a vessel temperature T0 acting on the vibration arrangement 3 from the container is determined as a temperature T acting on the or the piezo elements 10, 12 immediately before the piezo elements 10, 12.
  • the screw connection of the drive constructed in this way ensures that the electrodes, in particular the two thermo-electrodes 8, 9, are connected to one another.
  • a measurement of the reference junction temperatures prevailing at the line ends is necessary in such an arrangement with thermal resistances.
  • thermocouples z. B formed by NiCr + / Ni or NiCr + / CuNi-.
  • thermoelectrodes it is also possible to compensate the thermal voltage t directly at the transition point between the thermocouple and the copper cable with a corresponding wiring or to measure the temperature at the transition point and to perform a software compensation of the measurement result detected by the processor. If the need for electrical isolation can be dispensed with, it is also possible to dispense with one of the thermoelectrodes and instead use a membrane of such an arrangement as a second thermoelectrode.
  • thermoelectric lines as shown in Fig. 2, connected directly to such an electrode. Due to the much higher thermal conductivity of such a metallic compound compared to air, a thermal voltage t is likewise obtained, which contains the information of the temperature prevailing directly in front of the piezoelements.
  • FIG. 2 in contrast to FIG. 1, instead of a first and a second thermoelectrode, shows only a first thermoelectrode 8 between the first ceramic element 7 and the first piezoelement 10 and a connection preferably adjacent directly to the thermoelectrode 8 - Site 23, which connects the ground line 21 and the thermoelectric voltage line 22 to each other.
  • FIG. 3 shows that according to a particularly simple implementation principle, the temperature T is measured in front of a piezoelectric drive applied by means of adhesive technology and / or soldering technology.
  • thermoelectrode 8 a piezoelectric element 10 and a connection electrode 13 are glued together and / or soldered directly above a arranged on the oscillation assembly 3 ceramic 1, wherein the individual elements are shown spaced apart as in the other representations to sketch this more clearly.
  • a joint 23 is preferably formed near the thermo-electrode 8 with the joint 23 again connecting the ground line and the thermo-voltage line.
  • the connection electrode 13 is in turn connected via a connecting line 20 for transmitting transmitted signals s and received signals e.
  • All three embodiments show an exemplarily sketched storage device 18, in which optionally in addition to operating parameters through the arrangement certain temperatures can be stored. In the event of a malfunction, this allows a later readout of temperatures determined in this way, in order to be able to determine whether a malfunction was caused by too high a temperature or possibly other causes.
  • the control device 19 is designed to output different types of signals as needed.
  • the particular temperature T can be output via a corresponding port.
  • a switching signal sw and / or a warning signal w can also be output via further connections.
  • a switching signal for example pumps or other devices can be activated or deactivated to prevent emptying or overflow of a monitored by the thus formed vibration limit switch arrangement container.
  • the control device 19 preferably also takes into account a threshold temperature T * which should not be exceeded or exceeded in order to ensure fault-free operation in the region of the piezoelectric elements 8, 9. In particular, when such a threshold temperature T * is reached, corresponding switching and warning signals sw, w are output.
  • the threshold temperature (T *) is determined as a function of the piezo elements 10, 12 used, so that a trouble-free operation with respect to the critical operating temperatures of the piezo elements is ensured.
  • the consideration of the Curie temperature is important for vibration devices which are formed from piezoelectric elements or comparable elements with comparable physical properties.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Electronic Switches (AREA)

Abstract

La présente invention concerne un système d'interrupteur à vibrations comprenant un dispositif de commande (19, 16) destiné à produire un signal d'excitation (s) et/ou à traiter un signal de réception (e); un dispositif d'oscillation piézo-électrique (10, 12) destiné à produire une oscillation mécanique en fonction du signal d'excitation et/ou à convertir une oscillation mécanique en signal de réception; et un système d'oscillation (3) destiné à émettre l'oscillation mécanique produite par le dispositif d'oscillation, aux environs du système d'oscillation. Selon l'invention, un dispositif de détermination de température (19, 17) est utilisé pour déterminer la température (T) du dispositif d'oscillation (10, 12) et/ou la température de l'environnement du dispositif oscillation; et le dispositif de commande (19) est conçu pour produire un signal de commutation (sw) et/ou un signal d'avertissement (w) lorsque la température atteint une valeur seuil ou en fonction de la température (T). L'invention a également pour objet un procédé correspondant pour faire fonctionner l'interrupteur à vibrations.
EP06829332A 2005-12-27 2006-12-06 Dispositif de mesure de niveau de remplissage comprenant un interrupteur de securite qui intervient en cas de temperatures elevees Withdrawn EP1966569A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005062813A DE102005062813B4 (de) 2005-12-27 2005-12-27 Füllstandmessanordnung mit einer Sicherheitsabschaltung bei hohen Temperaturen
PCT/EP2006/011698 WO2007073837A2 (fr) 2005-12-27 2006-12-06 Dispositif de mesure de niveau de remplissage comprenant un interrupteur de securite qui intervient en cas de temperatures elevees

Publications (1)

Publication Number Publication Date
EP1966569A2 true EP1966569A2 (fr) 2008-09-10

Family

ID=37726979

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06829332A Withdrawn EP1966569A2 (fr) 2005-12-27 2006-12-06 Dispositif de mesure de niveau de remplissage comprenant un interrupteur de securite qui intervient en cas de temperatures elevees

Country Status (4)

Country Link
EP (1) EP1966569A2 (fr)
CN (1) CN101331388B (fr)
DE (1) DE102005062813B4 (fr)
WO (1) WO2007073837A2 (fr)

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Publication number Priority date Publication date Assignee Title
US7872170B2 (en) 2006-12-28 2011-01-18 Pioneer Hi-Bred International, Inc. Genetic markers for orobanche resistance in sunflower
DE102009029490B4 (de) 2009-09-16 2023-09-28 Endress+Hauser SE+Co. KG Füllstandsmessgerät
DE102010002608A1 (de) * 2009-12-29 2011-06-30 Endress + Hauser GmbH + Co. KG, 79689 Vorrichtung zur Bestimmung mindestens einer Prozessgröße
DE102010030791A1 (de) * 2010-07-01 2012-01-05 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Bestimmung und/oder Überwachung einer Prozessgröße eines Mediums
DE102011090015B4 (de) 2011-12-28 2023-12-28 Endress+Hauser SE+Co. KG Vorrichtung zur Bestimmung und/oder Überwachung mindestens einer Prozessgröße
DE102013109277B4 (de) 2013-08-27 2024-10-02 Endress+Hauser SE+Co. KG Vorrichtung zur Bestimmung oder Überwachung einer Prozessgröße
US11566936B1 (en) 2016-02-12 2023-01-31 Munters Corporation Method and apparatus to non-intrusively measure the weight of loose bulk material within a rigid containing structure

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US6073492A (en) * 1998-12-17 2000-06-13 Kay-Ray Sensall, Inc. Ultrasonic sensor for very high temperatures and pressures

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US6073492A (en) * 1998-12-17 2000-06-13 Kay-Ray Sensall, Inc. Ultrasonic sensor for very high temperatures and pressures

Also Published As

Publication number Publication date
CN101331388A (zh) 2008-12-24
CN101331388B (zh) 2011-02-16
DE102005062813B4 (de) 2009-11-26
WO2007073837A2 (fr) 2007-07-05
DE102005062813A1 (de) 2007-07-05
WO2007073837A3 (fr) 2007-08-16

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