EP1525438A1 - Dispositif de determination et/ou de controle d'une grandeur de processus physique ou chimique - Google Patents

Dispositif de determination et/ou de controle d'une grandeur de processus physique ou chimique

Info

Publication number
EP1525438A1
EP1525438A1 EP03766226A EP03766226A EP1525438A1 EP 1525438 A1 EP1525438 A1 EP 1525438A1 EP 03766226 A EP03766226 A EP 03766226A EP 03766226 A EP03766226 A EP 03766226A EP 1525438 A1 EP1525438 A1 EP 1525438A1
Authority
EP
European Patent Office
Prior art keywords
control
unit
zauswerteinheit
electrode
transmitting
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Withdrawn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
EP03766226A
Other languages
German (de)
English (en)
Inventor
Alexander Müller
Christoph Rompf
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 EP1525438A1 publication Critical patent/EP1525438A1/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Withdrawn legal-status Critical Current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
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/06—Indicating or recording devices
    • G01F15/068—Indicating or recording devices with electrical means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • 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
    • 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
    • G01F23/80—Arrangements for signal processing
    • G01F23/802—Particular electronic circuits for digital processing equipment
    • 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 device for determining and / or monitoring a physical or chemical process variable of a medium with a sensor, with a first control / evaluation unit and with a second control / evaluation unit, each control / evaluation unit having several components.
  • each control / evaluation unit having several components.
  • the process variables to be determined and monitored are, for example, the fill level, the flow, the density, the viscosity, the pressure, the temperature, the conductivity or the chemical composition of the medium.
  • the process variables are determined using the most varied types of sensors.
  • the Endress + Hauser Group offers and sells measuring devices for determining and monitoring the process variables mentioned above by way of example.
  • the measuring devices must meet the highest safety requirements.
  • Level monitoring in a tank by means of a point level detector may be mentioned as an example. If a flammable or a non-flammable, but water-endangering liquid is stored in the tank, it must be ensured to a high degree that the supply of liquid to the tank is interrupted as soon as the predetermined maximum fill level is reached. This in turn presupposes that the measuring device works reliably and without errors.
  • known solutions provide two sensors working in parallel. The risk of failure is halved by the double design of the monitoring device; on the other hand, this solution has double costs.
  • a failsafe limit switch has become known, which is offered and sold by the applicant under the designation 'FDL60 / FTL670'.
  • This failsafe limit switch is approved as an overflow protection for applications with high and extremely high safety requirements, ie the known limit switch ensures that it remains in the safe state with any type of failure and malfunction or immediately changes to the safe state. This state corresponds, for example, to the closing of the inlet valve.
  • a regular inspection and check of the correct work is done automatically with the known failsafe measuring device. Due to the redundant structure of the transmitter / receiver unit, the electronics and the evaluation unit as well as the use of two coded measuring channels, between which a control / evaluation circuit switches back and forth in a predetermined rhythm, errors can be made in the measuring device with the required high Recognize security.
  • the disadvantage of the known solution is that systematic errors that are inherent in the two measuring devices are not recognized.
  • the development of the known solution is technically very demanding, lengthy and expensive, since the occurrence of systematic errors must be avoided or minimized during the development process.
  • the invention has for its object to propose a device for use in automation and process measurement technology, which is characterized by a high degree of reliability.
  • the object is achieved in that at least one component of the first control / evaluation unit and the second control / evaluation unit is designed redundantly and diversely. This provides a simple way of eliminating or minimizing systematic errors by selecting the appropriate basic concept.
  • the components of the control / evaluation unit are hardware components or software components. According to a development of the device according to the invention, it is provided that a first microprocessor is assigned to the first control / evaluation unit and that a second microprocessor is assigned to the second control / evaluation unit. Processor is assigned. In order to fulfill the features essential to the invention: redundancy and diversity, the two microprocessors are of different types with regard to the hardware components. An alternative embodiment of the device according to the invention provides that the two microprocessors come from different manufacturers.
  • relays and / or the actuators are designed redundantly and diversely.
  • the software stored in the microprocessors comes from different sources (manufacturer, programmer).
  • the software variant has the advantage that it only incurs the costs of creating the software twice; There are no follow-up costs - as can be seen when using redundant hardware components.
  • the invention relates to a vibration detector for determining and / or monitoring the fill level of a medium in a container.
  • this type of detector can also be used for density measurements.
  • the invention is not limited to these explicitly mentioned applications:
  • the solution according to the invention can be used in a wide variety of field devices for the purpose of measuring the different process variables.
  • Vibration elements are dependent on the respective degree of coverage of the Vibrating element: While the vibrating element can carry out its vibrations freely and undamped in air, it experiences a change in frequency and amplitude 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), it is consequently possible to draw a clear conclusion that the predetermined fill level of the medium in the container has been reached.
  • the damping of the vibration of the vibrating element is also influenced by the respective density of the medium. Therefore, with a constant degree of coverage, there is a functional relationship to the density of the medium, so that vibration detectors are ideally suited for both level and density determination.
  • the vibrations of the membrane are recorded and converted into electrical reception signals by means of at least one piezo element.
  • the electrical received 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 take place optically and / or acoustically.
  • a switching process is triggered; for example, an inlet or outlet valve on the container is opened or closed.
  • the two control / evaluation units which consist of several redundant and diversely designed subcomponents, determine whether the predetermined fill level has been reached.
  • the transmitting / receiving unit is a disk-shaped piezoelectric element, on the side of which facing away from the oscillatable unit, an electrode structure is provided, which has at least one transmission / reception electrode, a reception / transmission electrode and a ground electrode. Furthermore, it is provided that the transmit / receive electrode and the receive / transmit electrode are semicircular, that the ground electrode is bar-shaped, and that the transmit / receive electrode and the receive / transmit electrode are arranged symmetrically with respect to the bar-shaped, centrally arranged ground electrode.
  • a corresponding configuration of a piezo drive for a limit switch has already been disclosed in EP 0 985 916 A1. It goes without saying that other configurations of the transmitter / receiver unit can also be used in connection with the device according to the invention.
  • the invention can also be based on the known and previously mentioned failsafe point level detector from Endress + Hauser.
  • FIG. 1 The invention is explained in more detail with reference to the following drawing, FIG. 1.
  • FIG. 1 shows a schematic illustration of the device 1 according to the invention for determining and / or monitoring the fill level of a
  • the device 1 shown in FIG. 1 is - as already explained at the previous point - suitable both for level detection and for determining the density of the medium in the container. While in the case of level detection the vibratable unit 2 is immersed in the medium or not in the medium only when the detected limit fill level is reached, it has to be immersed continuously in the medium up to a predetermined immersion depth h for the purpose of monitoring or for determining the density p.
  • the container can be, for example, a tank or a pipe through which the medium flows.
  • the device 1 has an essentially cylindrical housing.
  • a thread 7 is provided on the outer surface of the housing.
  • the thread 7 serves to fasten the device 1 at the level of a predetermined fill level and is located in a corresponding opening in the container. assigns. It goes without saying that other types of fastening, for example by means of a flange, can replace screwing.
  • the housing of the vibration detector 1 is closed off by the membrane 5 at its end region projecting into the container 3, the membrane 5 being clamped into the housing in its edge region.
  • the oscillatable unit 2 projecting into the container is fastened to the membrane 5.
  • the oscillatable unit 2 has the configuration of a tuning fork, that is to say comprises two spaced-apart oscillating rods 3, 4 fastened on the membrane 5 and projecting into the container.
  • the membrane 5 is set in vibration by a drive / receiver unit 6, the drive element exciting the membrane 5 to vibrate at a predetermined excitation frequency.
  • the drive element is e.g. B. a stack drive. Of course, it can also be the disk-shaped piezo drive already described above.
  • This so-called bimorph drive is constructed symmetrically: the transmitter unit is arranged in a semicircle, the receiver unit is located in the other semicircle. Both units are operated alternately as a sending and receiving unit.
  • the oscillatable unit 2 Due to the vibrations of the membrane 5, the oscillatable unit 2 also carries out oscillations, the oscillation frequencies being different if the oscillatable unit 2 is in contact with the medium and is coupled to the mass of the medium, or if the oscillatable unit 2 is free and can swing without contact with the medium.
  • the voltage difference causes the diaphragm 5 clamped in the housing to bend.
  • the vibrating rods 3, 4 of the vibratable unit 2 arranged on the diaphragm 5 execute opposite vibrations about their longitudinal axis due to the vibrations of the diaphragm 5.
  • Modes with opposite vibrations have the advantage that the alternating forces exerted by each vibrating rod 3, 4 on the membrane 5 cancel each other out.
  • the mechanical stress on the clamping is minimized, so that approximately no vibration energy on the Housing or on the attachment of the vibration detector is transferred. This can effectively prevent the fastening means of the vibration detector 1 from being excited to resonate vibrations, which in turn could interfere with the vibrations of the vibratable unit and falsify the measurement data.
  • the received electrical signals are forwarded via data lines 8, 9 to the first control / evaluation unit 10 and to the second control / evaluation unit 11. In the case shown, an error message is transmitted to the operating personnel via the output unit 14.
  • the limit switch when using the limit switch as an overflow protection, the inlet valve 21 is closed. If the limit switch is used as an idle protection, the pump is switched off.
  • the control or control center 12 arranged at a distance from the vibration detector 1 can be seen in FIG. 1.
  • the control / evaluation units 10, 11 and the control point 12 communicate with one another via the data line 13. The communication preferably takes place because of the increased interference immunity of the transmission on a digital basis in accordance with one of the known transmission protocols.
  • the control / evaluation units 10, 11 can either be accommodated in the vibration detector 1 (-> compact device); but they can also be arranged separately from the actual sensor.
  • each of the control / evaluation units 10, 11 comprises a microprocessor 15, 16.
  • the microprocessors 15, 16 are of different types and / or they come from different manufacturers.
  • the software used in the microprocessors 15, 16 is created, at least in the essential parts, by different programmers.
  • the redundant and diverse structure of the control / evaluation units 10, 11 largely precludes the occurrence of parallel and systematic errors. Measuring devices constructed in accordance with the invention are therefore highly protected against malfunctions or failure, so that they are suitable even for the most critical applications. LIST OF REFERENCE NUMBERS

Abstract

L'invention concerne un dispositif de détermination et/ou de contrôle d'une grandeur de processus physique ou chimique d'un milieu, comportant un capteur, une première unité de régulation/évaluation et une deuxième unité de régulation/évaluation, chaque unité de régulation/évaluation étant pourvue de plusieurs composants. Selon l'invention, au moins un composant respectif de la première unité de régulation/évaluation (10) et de la deuxième unité de régulation/évaluation (11) est conçu de façon redondante ou diversitaire.
EP03766226A 2002-07-26 2003-07-18 Dispositif de determination et/ou de controle d'une grandeur de processus physique ou chimique Withdrawn EP1525438A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10234303A DE10234303A1 (de) 2002-07-26 2002-07-26 Vorrichtung zur Bestimmung und/oder Überwachung einer physikalischen oder chemischen Prozeßgröße
DE10234303 2002-07-26
PCT/EP2003/007844 WO2004013585A1 (fr) 2002-07-26 2003-07-18 Dispositif de determination et/ou de controle d'une grandeur de processus physique ou chimique

Publications (1)

Publication Number Publication Date
EP1525438A1 true EP1525438A1 (fr) 2005-04-27

Family

ID=30469136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03766226A Withdrawn EP1525438A1 (fr) 2002-07-26 2003-07-18 Dispositif de determination et/ou de controle d'une grandeur de processus physique ou chimique

Country Status (5)

Country Link
US (1) US20060142954A1 (fr)
EP (1) EP1525438A1 (fr)
AU (1) AU2003250105A1 (fr)
DE (1) DE10234303A1 (fr)
WO (1) WO2004013585A1 (fr)

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DE102004033263B4 (de) 2004-07-09 2007-07-26 Diehl Aerospace Gmbh Steuer-und Regeleinheit
DE102005009580B4 (de) * 2005-02-28 2021-02-04 Endress+Hauser SE+Co. KG Verfahren und entsprechende Vorrichtung zur Bestimmung und/oder Überwachung einer Prozessgrösse
DE102005015546A1 (de) * 2005-04-04 2006-10-05 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Bestimmung und/oder Überwachung mindestens einer Prozessgröße
DE102007054672A1 (de) 2007-11-14 2009-05-20 Endress + Hauser Gmbh + Co. Kg Feldgerät zur Bestimmung oder Überwachung einer Prozessgröße in der Prozessautomatisierung
DE102008040101A1 (de) * 2008-07-02 2010-01-07 Alexander Becker Sicherungssystem für Lagertank
DE102009002734A1 (de) 2009-04-29 2010-11-11 Endress + Hauser Gmbh + Co. Kg Feldgerät zur Bestimmung oder Überwachung einer Prozessgröße in der Prozessautomatisierung
DE102009028022A1 (de) * 2009-07-27 2011-02-03 Endress + Hauser Gmbh + Co. Kg Verfahren zur Bestimmung und/oder Überwachung mindestens einer pysikalischen Prozessgröße eines Mediums
DE102009028938A1 (de) 2009-08-27 2011-03-03 Endress + Hauser Gmbh + Co. Kg Feldgerät zur Bestimmung oder Überwachung einer physikalischen oder chemischen Variablen
DE102010002346A1 (de) 2009-10-12 2011-04-14 Endress + Hauser Gmbh + Co. Kg Feldgerät zur Bestimmung oder Überwachung einer physikalischen oder chemischen Prozessgröße
DE102010043706A1 (de) 2010-07-05 2012-01-05 Endress + Hauser Gmbh + Co. Kg Feldgerät zur Bestimmung oder Überwachung einer physikalischen oder chemischen Prozessgröße
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ES2671716T3 (es) * 2010-11-29 2018-06-08 Air Products And Chemicals, Inc. Método y aparato para medir el contenido verdadero de un cilindro de gas bajo presión
DE102012106652A1 (de) 2012-07-23 2014-01-23 Endress + Hauser Gmbh + Co. Kg Feldgerät zur Bestimmung oder Überwachung einer Prozessgröße in der Automatisierungstechnik
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DE102014115693A1 (de) * 2014-10-29 2016-05-04 Endress + Hauser Gmbh + Co. Kg Vibronischer Sensor
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Also Published As

Publication number Publication date
AU2003250105A1 (en) 2004-02-23
DE10234303A1 (de) 2004-02-19
WO2004013585A1 (fr) 2004-02-12
US20060142954A1 (en) 2006-06-29

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