WO2005001392A2 - Ansatzalarm bei feldgeräten - Google Patents
Ansatzalarm bei feldgeräten Download PDFInfo
- Publication number
- WO2005001392A2 WO2005001392A2 PCT/EP2004/006707 EP2004006707W WO2005001392A2 WO 2005001392 A2 WO2005001392 A2 WO 2005001392A2 EP 2004006707 W EP2004006707 W EP 2004006707W WO 2005001392 A2 WO2005001392 A2 WO 2005001392A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- field device
- unit
- limit value
- determined
- calculated
- Prior art date
Links
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
-
- 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
-
- 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 field device for monitoring and / or determining a process variable of a medium, the process variable preferably being the fill level, the viscosity or the density of the medium, with an oscillatable unit, with a drive receiving unit the vibratable unit excites vibrations, or which receives the vibrations of the vibratable unit, and with a control-Z-evaluation unit, which regulates the vibrations of the vibratable unit or which evaluates the vibrations of the vibratable unit.
- the medium is e.g. a liquid in a container.
- Such a measuring device usually consists of an oscillatable unit, a drive receiving unit and a control Z control unit.
- the drive receiving unit excites the vibratable unit - usually a tuning fork - to vibrate and receives the vibrations
- the frequency (f) of the vibration depends, for example, on whether the vibratable unit vibrates in air or whether it is covered by the medium the frequency (f) can be used to deduce the degree of coverage, which can also be derived from the amplitude, but usually the frequency is evaluated, for example a piezo-electric element is present in the drive / reception unit which converts an electrical signal into a mechanical oscillation which then uses a suitable me membrane is transferred to the oscillatable unit.
- a feedback electronics unit which amplifies and returns the signal of the oscillatable unit, and the electronics for evaluating and further processing the vibration are combined in a control Z evaluation unit.
- level gauges are usually called Point level switch used.
- the vibratable unit is attached at a certain position, for example within a container, from which a fill level of the medium results. Measurements can either be made to fall below this level (idle protection or minimum protection or minimum detection) or to exceed this level (overfill protection, maximum protection or detection). With no-load protection, the oscillatable unit oscillates first in the medium and then in air or, for example, in a second medium with a lower density in the case of boundary layer detection (eg oil-water).
- boundary layer detection eg oil-water
- the oscillation frequency when the oscillatable unit is immersed in the medium or in the medium with higher density is lower than with the oscillation in air or in the medium with the lower density.
- control ZAusensetician generates an approach alarm if the oscillation frequency (f) of the oscillations of the oscillatory unit an adjustable limit value (G; GMinimum; G M aximum) below, wherein the limit value (G; G M inimu ⁇ .; G M aximum) can be determined at least from measured and Z or calculated dependencies of the oscillation frequency (f) on process conditions and Z or on the process variable to be monitored and Z or determined and Z or can be calculated.
- the oscillation frequency (f) is reduced by the approach. It is therefore checked whether the frequency (f) is below a limit value (G; G M minimum; GMaximum). In this case, an alarm or an error signal is issued.
- the limit value (G) is generally free and can be set according to the application and the process conditions.
- G inimum and GMaximum are two special limit values for the use of the field device for level detection (more on this in the following configurations).
- the oscillation frequency (f) is not only dependent on the approach, but also on the process conditions - e.g. temperature, pressure, density, viscosity etc. - and the process variables, e.g. level.
- the oscillation frequency (f) is also dependent, inter alia, on the design of the oscillatable unit. These dependencies of the frequency (f) on the process conditions and the process variable are measured, for example, in a comparison.
- the dependencies on the process size and process conditions relate to the design of the Field device and especially on the design of the vibratable unit. This comparison can then be stored, for example, in the field device itself or, for example, in a user manual. It is thus known how the frequency reacts to influences other than the process variable to be monitored and determined, and the appropriate limit value (G) can be set according to the measurements or calculations.
- G limit value
- process condition and process variable naturally also depends on what is to be measured, so that depending on the application, a process condition can also become a process variable and vice versa. Both, process size and condition, are physical and chemical parameters that influence the oscillation frequency. If the process variable is the fill level, the process conditions are, for example, density, viscosity, temperature and pressure.
- the fill level is a process condition. Since the frequency also depends on the temperature, this can also be a process variable. If the approach is to be recognized in a field device used as a maximum switch, the limit value (G a ximum) must be set based on the frequency which results when the oscillatable unit oscillates freely. When using it as a minimum switch, the frequency must be used when the oscillating unit is covered. So this refers to the process size. If the field device is used, for example, for viscosity monitoring, a certain degree of coverage - the level is now a process condition - is required, which in itself leads to a reduction in the oscillation frequency.
- the dynamics of the vibrating unit must always be considered. Dynamic is understood here to mean the change in frequency which results, for example, from the release of the oscillatable unit, for example the tuning fork.
- the Dynamics or the frequency swing of the vibratable unit is usually independent of the approach, insofar as the approach does not have a greater mass than the vibratable unit.
- the field device can report the transition from the covered to the free state.
- this limit value G is too small or the difference between the limit value (G) and the frequency above which the release is reported, too large.
- An increase in the limit value (G) in order to do justice to the dynamics may result in a restriction of the application range - for example in relation to a smaller density, temperature or pressure range - with the same vibrating unit, i.e. a restriction in availability ,
- the process variable is the fill level
- the limit value (G) is determinable and calculable depending on the use of the field device, whether as a minimum (G M inimu) or maximum switch (GMaximum) is.
- the limit value (G) depends on whether the vibratable unit is covered with the medium or whether it vibrates freely, ie the limit value (G) is also dependent on the use of the field device. Due to the medium being covered when used as a minimum switch, the frequency is already significantly lower. This limit value (GMinimum) is therefore smaller than the limit value (GMaximum) which is necessary when using the field device as a maximum switch.
- the limit value (GMaximum) In the case of the maximum switch, a distinction must be made between falling below the limit value (GMaximum) without falling below the corresponding lower value - this can be the limit value (GMminimum) for use as a minimum switch, for example, which corresponds to the state that the oscillatable unit covers is - this leads to an approach alarm -, and falling below both frequency values, or falling below the lower value, which results from the increase in the level - this leads to the covered message.
- the vibratable unit is a tuning fork and, for example, a solid from the medium jams between the fork, it may not be possible to differentiate between the base and the medium, ie if the maximum fill level is undershot, the field device still issues a covered message. However, such jamming can usually only be remedied by, for example, manual intervention, ie for such extreme cases a plausibility check of the message from the field device is still necessary. According to the invention this problem is solved in that when
- the reception amplitude is minimized in such a way that the excitation electronics of the field device jump to a natural resonance which is usually below a limit value (G) for an approach alarm.
- Availability may be reduced in favor of increased functional safety.
- permissible process parameters to be monitored and determined can be determined and calculated.
- the field device is generally restricted in terms of some process conditions. This prevents the entire field device or individual parts of the field device from being destroyed.
- the limit value (G; GMinimum; Maximum) must therefore be determined from the frequency at maximum pressure. A higher pressure would lower the frequency further, but the field device is not approved for a higher pressure.
- the lowest oscillation frequency (f) and thus the corresponding limit value (G) can be determined from a combination of the maximum permissible process conditions.
- the process variable to be measured is another parameter, e.g. that the oscillatable unit is covered. Depending on the application, the process size must also be taken into account.
- the limit value (G; G M inimun .; G M a ⁇ imum) can be determined and calculated or calculated taking into account a maximum admissible approach or the frequency change associated with the maximum admissible approach.
- G G M inimun .
- G G M inimun .
- the maximum permissible approach must be set, for example, according to the type of medium and the application.
- the process conditions are temperature and Z or pressure and Z or density and Z or viscosity and Z or fill level of the medium.
- the density and the viscosity of the medium are variables that also influence the oscillation frequency (f).
- the process variable is the level. However, if the density is to be monitored, for example, the level must be known exactly (e.g. complete coverage).
- An advantageous embodiment provides that a control unit is provided which generates a batch alarm independently of the control Z evaluation unit if the oscillation frequency (f) of the oscillations of the oscillatable unit falls below an adjustable limit value (G; GMinimum; GMaximum).
- G an adjustable limit value
- Such an independent control unit has the advantage that the functionality of the field device is monitored redundantly. This is e.g. relevant for applications with increased demands on the functional safety of electrical, electronic or programmable electronic systems.
- the control unit can be spatially separated from the control Z evaluation unit, but it can also be a component of the control Z evaluation unit.
- control Z evaluation unit generates a free message when the oscillation frequency (f) of the oscillations of the unit capable of oscillation exceeds an adjustable upper value (O), the upper value (O) being determinable and calculable from measured andZor calculated dependencies of the oscillation frequency (f) on process conditions andZor on the process variable to be determined andZor to be monitored.
- the oscillatable unit is therefore initially covered. If the medium falls below the specified level, the unit vibrates freely - or as discussed above in a medium with a lower density - and at the same time with a higher oscillation frequency (f). Depending on the type of the vibrating unit and the installation, the frequency (f) may change gradually.
- the upper value (O) can be determined and calculated or calculated from the greatest oscillation frequency (f) depending on the corresponding maximum process conditions permissible with respect to the field device and depending on the oscillatable unit oscillating uncovered.
- the limit value (G; G ini um) that the oscillatable unit was covered, it must oscillate freely in accordance with the definition of the upper value (O).
- the upper value (O) is thus to be determined, for example, from the frequency at minimal pressure, since this results in the greatest frequency.
- the upper value (O) can be determined and calculated or calculated using a maximum admissible approach or the frequency change associated with the maximum admissible approach.
- a minimum of approach should be allowed.
- a certain tolerance regarding the upper value (O) should be built in, so that e.g. a single air bubble cannot already generate the free message.
- the limit value (G; GMinimum) and the upper value (O) are each set specifically to the density or viscosity of the medium, for example. You have to choose between a general restriction, for example with regard to the permissible density, or a special adjustment to the medium and for the possible process conditions, such as the temperatures that occur.
- Fig. 2 a not to scale, schematic location of the individual frequencies.
- Fig. 1 shows the field device 1 consisting of the oscillatable unit 10 - here a tuning fork -, the drive receiving unit 11 and the control ZAuswertisme 12.
- a field device 1 is attached, for example, near the bottom of a container in which the medium to be monitored. If the medium falls below this level, the oscillatable unit 10 oscillates in the air and thus has a higher oscillation frequency f (minimum protection). This is processed by the control ZAuswertisme 12 into a signal.
- the vibration frequency f could already be reduced so much by one approach that the vibration fork that has become free also vibrates below the threshold values, which the control Z evaluation unit 12 recognizes as freely vibrating. This means that no alarm is triggered and, for example, a pump could overheat, which is dangerous with inflammable media.
- the control unit 13 is provided in the example shown, which checks whether the oscillation frequency f falls below the limit value G. This additional
- Monitoring can e.g. trigger an alarm independently of the control Z evaluation unit 12. Something like that important for applications with increased demands on functional safety. However, the control unit 13 can also be part of the control Z evaluation unit 12.
- the individual frequencies or limit values are shown schematically and not to scale in FIG. 2.
- the frequency f increases from the bottom up.
- G M minimum for use as a minimum switch or as an idle protection.
- This limit value GMinimum is also undershot if, for example, the tuning fork is jammed and the
- the limit value G aximum which is the maximum switch or Overflow protection is used.
- This limit value G M aximum is greater than the limit value G inimu, since the oscillation frequency is greatly reduced by immersion in the medium, which is why, conversely, an approach on the field device that is used as a maximum switch would have to be very large in order to achieve this lower limit value To fall below G M minimum.
- the limit value G depends on which process conditions prevail and what should be measured.
- the upper value O the exceeding of which leads to the message that the mechanically oscillatable unit oscillates freely or in a medium with a lower density.
- a further value can be provided above the upper value O, the
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Immunology (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Fluid Mechanics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Thermal Sciences (AREA)
- Electromagnetism (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Engineering & Computer Science (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Testing And Monitoring For Control Systems (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04740140.1A EP1636553B1 (de) | 2003-06-23 | 2004-06-22 | Ansatzalarmerzeugung bei feldgeräten zur füllstandsmessung |
US10/562,224 US7665357B2 (en) | 2003-06-23 | 2004-06-22 | Accretion alarm for field devices |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10328296.3 | 2003-06-23 | ||
DE10328296A DE10328296A1 (de) | 2003-06-23 | 2003-06-23 | Ansatzalarm bei Feldgeräten |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005001392A2 true WO2005001392A2 (de) | 2005-01-06 |
WO2005001392A3 WO2005001392A3 (de) | 2005-04-07 |
Family
ID=33520865
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2004/006707 WO2005001392A2 (de) | 2003-06-23 | 2004-06-22 | Ansatzalarm bei feldgeräten |
Country Status (6)
Country | Link |
---|---|
US (1) | US7665357B2 (de) |
EP (1) | EP1636553B1 (de) |
CN (1) | CN100394148C (de) |
DE (1) | DE10328296A1 (de) |
RU (1) | RU2316737C2 (de) |
WO (1) | WO2005001392A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011038985A1 (de) * | 2009-09-30 | 2011-04-07 | Endress+Hauser Gmbh+Co.Kg | Verfahren zur bestimmung und/oder überwachung mindestens einer physikalischen prozessgrösse |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004036359B4 (de) * | 2004-04-19 | 2008-11-06 | Uwt Gmbh | Verfahren zur Ermittlung einer Aussage über die Sicherheit einer mit einer Schwingsonde in einem Behälter durchgeführten Flüssigkeits-Füllstandsmessung |
DE102004059050B4 (de) * | 2004-12-07 | 2014-07-17 | Endress + Hauser Gmbh + Co. Kg | Vorrichtung zur Bestimmung und/oder Überwachung mindestens einer Prozessgröße |
DE102005009580B4 (de) * | 2005-02-28 | 2021-02-04 | Endress+Hauser SE+Co. KG | Verfahren und entsprechende Vorrichtung zur Bestimmung und/oder Überwachung einer Prozessgrösse |
DE102005062001A1 (de) * | 2005-12-22 | 2007-06-28 | Endress + Hauser Gmbh + Co. Kg | Verfahren und Vorrichtung zur Bestimmung mindestens einer Messgröße eines Mediums |
DE102008043467A1 (de) | 2008-11-04 | 2010-05-06 | Endress + Hauser Gmbh + Co. Kg | Vorrichtung zur Bestimmung und/oder Überwachung eines Drucks |
US8511144B2 (en) * | 2010-01-11 | 2013-08-20 | General Electric Company | Torsional sensor, method thereof, and system for measurement of fluid parameters |
DE102010003734B4 (de) * | 2010-04-08 | 2021-06-17 | Endress+Hauser SE+Co. KG | Verfahren zur Detektion von Gasblasen in einem flüssigen Medium |
US10184870B2 (en) * | 2013-04-03 | 2019-01-22 | Micro Motion, Inc. | Vibratory sensor and method |
DE102013113253A1 (de) * | 2013-11-29 | 2015-06-03 | Endress + Hauser Flowtec Ag | Thermisches Durchflussmessgerät und Verfahren zum Betreiben eines thermischen Durchflussmessgerätes |
DE102015102834A1 (de) * | 2015-02-27 | 2016-09-01 | Endress + Hauser Gmbh + Co. Kg | Vibronischer Sensor |
EP3078943B1 (de) * | 2015-04-07 | 2021-06-16 | VEGA Grieshaber KG | Messgerät und verfahren zur erfassung eines füllstands eines mediums |
GB2540338A (en) * | 2015-05-18 | 2017-01-18 | Rosemount Measurement Ltd | Improvements in or relating to field devices |
DE102015121621B4 (de) | 2015-12-11 | 2018-03-01 | Endress+Hauser Gmbh+Co. Kg | Vorrichtung zur sicheren Bestimmung und/oder Überwachung einer Prozessgröße |
GB2552685A (en) | 2016-08-03 | 2018-02-07 | Rosemount Measurement Ltd | Improvements in or relating to vibrating fork level switches |
EP3453459A1 (de) | 2017-09-06 | 2019-03-13 | Siemens Aktiengesellschaft | Verfahren zum betrieb einer anlage, anlage und computerprogrammprodukt |
DE102017130527A1 (de) * | 2017-12-19 | 2019-06-19 | Endress+Hauser SE+Co. KG | Vibronischer Sensor |
DE102019112866A1 (de) * | 2019-05-16 | 2020-11-19 | Endress+Hauser SE+Co. KG | Zustandsüberwachung eines vibronischen Sensors |
DE102019135288A1 (de) | 2019-12-19 | 2021-06-24 | Endress+Hauser Group Services Ag | System und verfahren zum überwachen eines zustands von mindestens einem objekt, das in einem rohrleitungssystem umfasst ist |
DE102020127077A1 (de) * | 2020-10-14 | 2022-04-14 | Endress+Hauser SE+Co. KG | Verfahren zum Betreiben eines vibronischen Sensors |
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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2003
- 2003-06-23 DE DE10328296A patent/DE10328296A1/de not_active Withdrawn
-
2004
- 2004-06-22 WO PCT/EP2004/006707 patent/WO2005001392A2/de active Application Filing
- 2004-06-22 RU RU2006101680/28A patent/RU2316737C2/ru active
- 2004-06-22 CN CNB2004800177345A patent/CN100394148C/zh not_active Expired - Fee Related
- 2004-06-22 US US10/562,224 patent/US7665357B2/en active Active
- 2004-06-22 EP EP04740140.1A patent/EP1636553B1/de not_active Expired - Lifetime
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CH683375A5 (de) * | 1991-10-01 | 1994-02-28 | Vibro Meter Ag | Verfahren und Flüssigkeitsdetektor zur Erfassung der Anwesenheit, des Standes oder des Zustandes einer Flüssigkeit. |
DE10014724A1 (de) * | 2000-03-24 | 2001-09-27 | Endress Hauser Gmbh Co | Verfahren und Vorrichtung zur Feststellung und/oder Überwachung des Füllstandes eines Mediums in einem Behälter |
DE10161071A1 (de) * | 2001-12-12 | 2003-06-18 | Endress & Hauser Gmbh & Co Kg | Feldgeräteelektronik mit einer Sensoreinheit für die Prozessmesstechnik |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011038985A1 (de) * | 2009-09-30 | 2011-04-07 | Endress+Hauser Gmbh+Co.Kg | Verfahren zur bestimmung und/oder überwachung mindestens einer physikalischen prozessgrösse |
CN102549399A (zh) * | 2009-09-30 | 2012-07-04 | 恩德莱斯和豪瑟尔两合公司 | 用于确定和/或监测至少一个物理过程变量的方法 |
CN102549399B (zh) * | 2009-09-30 | 2014-07-23 | 恩德莱斯和豪瑟尔两合公司 | 用于确定和/或监测至少一个物理过程变量的方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1636553B1 (de) | 2016-12-07 |
RU2006101680A (ru) | 2006-06-10 |
CN100394148C (zh) | 2008-06-11 |
CN1813172A (zh) | 2006-08-02 |
RU2316737C2 (ru) | 2008-02-10 |
US7665357B2 (en) | 2010-02-23 |
WO2005001392A3 (de) | 2005-04-07 |
DE10328296A1 (de) | 2005-01-20 |
EP1636553A2 (de) | 2006-03-22 |
US20080072667A1 (en) | 2008-03-27 |
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