WO2005062001A1 - Verfahren zur füllstandsmessung nach dem laufzeitprinzip - Google Patents
Verfahren zur füllstandsmessung nach dem laufzeitprinzip Download PDFInfo
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- WO2005062001A1 WO2005062001A1 PCT/EP2004/053462 EP2004053462W WO2005062001A1 WO 2005062001 A1 WO2005062001 A1 WO 2005062001A1 EP 2004053462 W EP2004053462 W EP 2004053462W WO 2005062001 A1 WO2005062001 A1 WO 2005062001A1
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- WIPO (PCT)
- Prior art keywords
- echo
- determined
- container
- current
- measurement
- Prior art date
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- 238000000691 measurement method Methods 0.000 title description 2
- 238000005259 measurement Methods 0.000 claims abstract description 143
- 238000000034 method Methods 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000002592 echocardiography Methods 0.000 claims description 13
- 230000001133 acceleration Effects 0.000 claims description 9
- 238000004393 prognosis Methods 0.000 abstract 2
- 230000006870 function Effects 0.000 description 38
- 238000011161 development Methods 0.000 description 9
- 230000002123 temporal effect Effects 0.000 description 4
- 238000002604 ultrasonography Methods 0.000 description 4
- 230000001960 triggered effect Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 238000013213 extrapolation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000000861 blow drying Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- 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
- G01F23/2962—Measuring transit time of reflected waves
-
- 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
- G01F23/284—Electromagnetic waves
Definitions
- the invention relates to a method for level measurement according to the transit time principle with non-contact level measurement devices.
- Such non-contact measuring devices are used in a large number of branches of industry, for example in the processing industry, in chemistry or in the food industry.
- short transmission signals for example microwaves or ultrasound waves
- the echo signals reflected on the surface are received again after a distance-dependent transit time.
- An echo function representing the echo amplitudes as a function of the transit time is formed. Each value of this echo function corresponds to the amplitude of an echo reflected at a certain distance from the antenna.
- a useful echo is determined from the echo function, which probably corresponds to the reflection of a transmission signal on the product surface. It is generally assumed that the useful echo has a larger amplitude than the other echoes. Given the known propagation speed of the transmission signals, the running time of the useful echo directly results in the distance between the product surface and the antenna. Usually, it is not a received raw signal that is used for evaluation, but rather its so-called envelope curve. The envelope is generated by rectifying and filtering the raw signal. A maximum of the envelope curve is first determined in order to precisely determine the duration of the useful echo. This traditional approach works fine in a variety of applications. However, problems always occur when the echo from the level cannot be identified without any doubt.
- the level meter can be given the current level.
- the fill level measuring device can identify the associated echo as a useful echo on the basis of the preset fill level and can, for example, overshadow it using a suitable afeorithm. For example, maxima of the echo signal or the echo function are determined in each measurement cycle and are based on them Knowing the level determined in the previous measuring cycle and an application-specific maximum expected rate of change of the level determines the useful echo. The new fill level then results from a running time of the current useful echo determined in this way.
- a time window is determined in which the useful echo of the current measuring cycle must be located.
- the current useful echo can only be found in this time window if the useful echo of the previous measuring cycle could be determined and a maximum corresponding to the current useful echo can be found in the current measuring cycle.
- the duration of the maximum of the useful echo is, however, an echo property that cannot always be determined. For example, if the level is near a fixed interferer, e.g. a holder inside the container, so the echoes of the interferer and the contents overlap. Identification of the useful echo is then not always possible. Similar problems occur if elements protrude only sporadically into the signal path, e.g. Stirrer, suddenly appear near the surface of the material in the signal path and reflect the transmitted signals, or if the reflective properties of the material, e.g. by foaming on the surface.
- the invention achieves this by a method for measuring a fill level of a product in a container, with a fill level measuring device operating according to the transit time principle, in which
- the echo properties are transit times of maxima of the echo function, and the maxima can be assigned a known reflector in the interior of the container, in particular a surface for the product, a bottom of the container or a permanently installed interferer.
- a prediction is made for the running time of the corresponding maximum to be expected in the current measurement based on the running time of at least one maximum of a previous measurement.
- the prediction is made that the expected transit times of the maxima are equal to the transit times of the corresponding maxima of the immediately preceding measurement.
- the prediction for the running time of the maxima is determined by calculating an instantaneous rate of change in the running time using at least two previous measurements and extrapolating the expected running time using this speed.
- the prediction for the running time of the maxima is determined by calculating a current acceleration and a current changing speed of the running time using at least three previous measurements and extrapolating the expected running time using the acceleration and the speed.
- an echo property is the transit time of the useful echo reflected on the surface of the product. At least one previous measurement is used to determine the transit time of the useful echo to be expected from the surface of the product to be expected during the current measurement and to determine the maximum of the current echo function whose duration has the smallest deviation from the predicted transit time of the useful echo reflected at the surface of the product. The current level is determined based on the running time of this maximum.
- an echo property is the transit time of the echo reflected at the bottom of the container.
- the transit time of the echo reflected at the bottom of the container to be expected in the current measurement is determined and the maximum of the current echo function is determined, the transit time of which is the smallest deviation from that predicted transit time of the echo reflected at the bottom of the container. Taking into account the running time of this maximum, the current level is determined.
- an estimated value for the running time of the current useful echo is calculated from the running time of the current echo reflected on the ground.
- the maximum of the current echo function is determined, the running time of which has the smallest deviation from the estimated value, and the current level is determined based on the running time of this maximum.
- the measurement results are continuously checked for plausibility.
- FIG. 2 shows an example of one with the one in FIG. 1
- FIG. 1 shows an arrangement for level measurement.
- a container 3 filled with a material 1 is shown.
- a FuUstandsmeßgerat 5 is arranged according to the runtime principle.
- a suitable measuring device 5 is e.g. a level measuring device working with microwaves or a level measuring device working with ultrasound.
- the fill level measuring device 5 serves to measure a fill level 7 of the product 1 in the container.
- An interferer 9 is shown as an example in the container 3. Interferers 9 are e.g. fixed installations in the container 3 where reflections can occur. The fact that only one interferer 9 is provided here serves for easier understanding and clarity. Of course, there can be many more interferers in real measurement situations.
- the FuUstandsmeßgerat 5 has at least one transmitting and receiving element 11 for transmitting transmission signals S and for receiving echo signals E.
- the exemplary embodiment shown shows a micro-level measuring device which, as the transmitting and receiving element 11, has a single antenna 11 which both transmits and receives.
- an antenna for transmitting and at least one further antenna for receiving can also be provided.
- a transmission sensor with an electromechanical transducer, for example a piezoelectric element should be provided as the transmitting and receiving element instead of the antenna.
- the transmission signals S are sent in the direction of the material 1 and are reflected on a surface 7 of the material, but also on the container 3 and on interferers 9 located in the container 3. The superposition of these reflections forms the echo signal E.
- transmission signals S e.g. short microwaves or ultrasound pulses, emitted in the direction of a filling material 1.
- the echo signals E of the transmission pulses S are recorded and fed to a signal processing 13, which is used to derive an echo function A (t) from the received echo signals E, which contains amplitudes A of the echo signal E as a function of their transit time t.
- FIG. 2 An example of a so-called echo function for the arrangement of FIG. 1 is shown in FIG. 2.
- the echo function has three distinct maxima. These maxima are echoes L, S, B, of which the echo L can be attributed to a reflection on the surface of the product, the echo S can be attributed to a reflection on the interferer 9 and the echo B can be attributed to a reflection on a bottom 15 of the container 3.
- the echoes L, S, B occur after propagation times t, t, t, which correspond to a distance between the transmitting and receiving element 11 and the surface of the material, or the interferer 9 and the floor 15.
- the FuUstandsmeßgerat 5 working according to the running time periodically sends transmission signals S in the direction of the filling material 1. Echo signals E of the transmission signals S are recorded and in the echo function A (t) converted.
- FIGS. 1 to n An example of a temporal development of echo functions A (t) is shown in FIGS. 1 to n in FIG. 3.
- the example represents a waste that occurs when an initially empty container 3 is constantly emptied.
- Fig. 0 corresponds to a full container 3 and Fig. N to an empty container 3.
- At least one echo property of the echo function A (t) is determined in each measurement cycle.
- the echo properties are preferably transit times t, t , t of maxima of the echo function A (t), to which a known reflector inside the s B container 3, in particular the surface of the material, the bottom 15 of the container 3 or a permanently installed interferer, such as interferer 9, can be assigned.
- an initialization is carried out when the fill level measuring device 5 is started up at the start of the method.
- the echo properties present here during the initialization here t, t, t 0 SO B0, are determined once and stored in the fuel level measuring device 5. Accordingly, other echo properties, e.g. the amplitude, the shape and / or the time course of the echoes.
- the image 0 corresponds to the echo function A (t), which was recorded during commissioning.
- the determination of the echo properties of the echo function A (t) recorded during the initialization is carried out, for example, by the fill level 7 present during commissioning, as well as the distance of the bottom 15 of the container 3 from the transmitting and receiving element 11 and the distance of the interferer 9 from the transmitter - And receiving element 11 or from the floor 15 are specified by a user.
- the distance of the bottom 15 of the container 3 from the transmitting and receiving element 11 and the distance of the interferer 9 from the transmitting and receiving element 11 or from the bottom 15 are generally known to the user and can e.g. via a communication interface 16 or an on-site display not shown in the figures and stored in a memory 17.
- the fill level can be determined, for example by soldering, if it is not already known during commissioning.
- the current fill level 7 can also be determined by means of a conventional fill level measurement described at the beginning with the fill level measuring device 5. In the latter method, high safety demands are preferably made on the level measurement.
- the measured fill level is only stored as the current fill level 7 if the associated useful echo has been identified beyond any doubt.
- the amplitude of the useful echo is suitable as an evaluation criterion for the unambiguous identification. If this exceeds a predetermined welding value and is significantly larger than the amplitudes of the echo function in the vicinity of the useful echo, it can be assumed that that the correct echo was determined as useful echo.
- the echoes L, S, B of the echo function A (t) can be clearly identified and the transit times t, t, t of the associated maxima can be determined and stored.
- the fill level 7 can of course also be determined by other methods. For example, in the German patent application filed on December 20, 2002 with the application number 10260962.4, a method is described in which a table is set up by recording echo functions at different fill levels 7, by means of which the echo originating from item 1 can be uniquely identified.
- the measuring operation can be started.
- the echo properties determined during initialization are available in the first measurement as the echo properties of the measurement immediately preceding the current measurement.
- a prediction for the echo properties to be expected in the current measurement is derived on the basis of the echo properties of at least one previous measurement.
- a prediction for the running time of the corresponding maximum to be expected in the current measurement is preferably made on the basis of the running time of at least one maximum of a previous measurement. > •
- echo characteristics such as e.g. Amplitude, shape and / or time course based on the corresponding data of at least one previous measurement made a prediction for the echo properties to be expected in the current measurement.
- a prediction V for the L0 SO B0 in the first measurement is based on the transit times t, t, t determined as echo properties during the initialization expected running times T, T, T of the corresponding maxima.
- V t Ll L0
- the prediction V as described here, can be based on the immediately preceding measurement. Alternatively, however, one can also go back Measurement can be used as a starting point. It is also possible to derive the prediction V from several previous measurements.
- the prediction V for the expected transit times T, T, T can, for example, be set equal to an average of the transit times t Li Si Bi L, t, t of the corresponding maxima of several previous measurements SB.
- the prediction V for the transit times T, T, T of the maxima Li Si Bi can be determined by using the last two preceding measurements for each transit time T, T, T calculates an instantaneous rate of change v (T), v (T), v (T) Li Si Bi Li Si Bi of the running times T, T, T and the expected running times T, T, T Li Si Bi Li Si Bi based on these Speeds v (T), v (T), v (T) are extrapolated.
- V (T Li): L L.i 1 zl. L. ⁇ -2
- the prediction V for transit times can be determined by using the last three previous measurements a momentary acceleration a (T), a (T), Li Si a () the Terms calculated and the expected terms based on the Accelerations a (T), a (T), a (T) and the speeds v (T), v (T), v (T) Li Si Bi Lt Si are extrapolated.
- the prediction V is as follows:
- the echo properties of the current measurement i here the transit times t, t, t, t, are then determined, including the predictions V.
- the maxima, here Ml, M2 and M3, and the associated transit times, here t, t and t of the echo function shown in FIG. 1 of FIG. 3 Ml M2 M3 A (t) of the current measurement can be determined.
- the running times are compared with the running times of the forecast. The comparison is made, for example, by forming the difference, in that for each expected runtime T, T, T the difference between each of the runtimes t, t and t and the runtime T, T and T to be expected is calculated. For each expected Ll Sl Bl runtime T, T, T, that runtime t, t or t is determined at which the difference Ll Sl Bl Ml M2 M3 is minimal.
- a shape comparison can be carried out, for example, by minimizing the sum of squares apart.
- a time window for each expected running time T, T or T Bl Ll Sl B l includes the respective expected running time T, T or T. It Ll Sl Bl it is then sufficient to compare only those of the transit times t, t and t with the associated transit time to be expected, which lie within the respective time window.
- the transit time t has the smallest difference to the MI predicted for the useful echo, transit time T. If the amount of the difference T-1 Ll Ll Ml is less than a predetermined welding value, the associated maximum Ml is recognized as the useful echo L of the current measurement. Accordingly, the associated runtime t as Ml
- the maximum M2 is recognized as the echo S of the interferer 9 and the maximum M3 as the echo of the bottom 15, and the associated transit time t M2 transit time t of the echo S of the interferer S and the transit time t as transit time t of the echo B Sl M3 Bl of the base 15 of the current measurement rated.
- the procedure is analogous in each measuring cycle.
- the prediction V can be calculated from the first measurement on the basis of a previous measurement, from the third measurement on the basis of three previous measurements and.
- [154] t is the running time of the bottom 15 of the container 3 B
- the transit time t of the echo originating from the interferer 9 can be determined as an echo property.
- This echo characteristic is always suitable for determining the height H of the fill level 7 when the fill level 7 is above the interferer 9. Whether this is the FaU can be determined on the basis of the height H of the fill level 7 determined in the previous measurement and a predetermined maximum possible rate of change v of the fill level 7.
- the maximum possible maximum rate of change v of the fill level 7 is application-specific and must either be specified by the user during the initialization and stored in the FuUstandsmeßgerat 5, or determined.
- the transit time t of the echo S generated by the interferer 9 has a constant value and cannot be used for determining the fill level. However, it is suitable for checking the measurement accuracy and the plausibility of the measurement results obtained.
- the method in its simplest form only uses a single echo property of the echo function. The property is the transit time t of the useful echo L or the transit time t of the echo B originating from the floor 15. In each measurement cycle, the corresponding echo property is used to make a prediction V for the echo property to be expected in the current measurement, at least one previous measurement in the manner described above derived.
- the echo property of the current measurement is then determined, including the prediction V, and the current level is determined on the basis of the echo property, as explained above, by using at least one previous measurement to determine the transit time T to be expected in the current measurement of the useful echo reflected on the surface of the product L is determined, the maximum of the current echo function is determined, the running time of which has the smallest deviation from the predicted running time of the useful echo reflected on the surface of the product, and the current level is determined on the basis of the running time of this maximum, as explained above.
- the echo property of the current measurement cannot be determined, e.g. Because a stirrer temporarily protrudes into the signal path, the prediction V can be placed on the control of the current echo property.
- the current level is set equal to the level 7 resulting from the prediction V.
- the prediction V occurs at the control of the echo property known from the previous measurement.
- At least one further echo property of the echo function is preferably used in the method according to the invention.
- the echo properties propagation time t of the useful echo L and propagation time t of the echo B originating from the floor 15 LB can be used.
- a prediction V for the current measurement is made based on the corresponding echo properties of at least one previous measurement in the manner described above. waiting echo characteristics derived.
- the echo properties of the current measurement are then determined, including the prediction V.
- the current level can be determined on the basis of each of the included echo properties, as explained above.
- the current fill level can optionally be set equal to the fill level determined on the basis of the echo property transit time t of the useful echo L or transit time t of the echo BLB originating from the base 15.
- both echo properties can be determined, it is possible to specify whether the echo property for determining the fill level 7 is preferred. The selection can also be made depending on the level of the current fill level 7.
- the fill level 7 will be determined on the basis of the other determinable echo properties.
- the current level is set equal to the resulting level 7 resulting from the determined echo properties.
- an estimation value T (t) for the transit time of the current useful echo L can be calculated on the basis of the transit time t of the current echo Bi B reflected on the floor 15.
- This estimated value T (t) occurs at the control of the prediction V for the expected LX Bi delay time T of the useful echo L.
- the maximum of the current Li echo function is determined, the delay of which differs from the estimated value T (t ), and based on the running time of this maximum, the current LX Bi level is determined.
- the prediction V can be substituted for the current echo properties.
- the current level is set equal to the level 7 resulting from the prediction V.
- the prediction V occurs at the control of the echo properties known from the previous measurement.
- the measurement results are preferably checked continuously for plausibility.
- the comparison of the heights H of the fill level H (t), H (t) determined as a function of the different echo properties is particularly suitable. If the fill level 7 lies above the interferer 9, the L Li L Bi height H (t) can also be attracted as a function of the transit time t of the echo S-L Si Si originating from the interferer 9. If the fill level 7 is below the interferer 9, the runtime t Si can be checked for correctness on the basis of the data recorded during the initialization. This results in a control possibility for the measuring accuracy. A plausibility check can also be carried out.
- selected echo properties can be supplemented, replaced or deleted.
- the described method can be used as an independent measuring method, but it can also be used in parallel with a conventional measuring method.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/583,354 US7819002B2 (en) | 2003-12-19 | 2004-12-14 | Filling level measurement method according to the running time principle |
EP04804820.1A EP1695043B1 (de) | 2003-12-19 | 2004-12-14 | Verfahren zur füllstandsmessung nach dem laufzeitprinzip |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10360710.2 | 2003-12-19 | ||
DE10360710A DE10360710A1 (de) | 2003-12-19 | 2003-12-19 | Verfahren zur Füllstandsmessung nach dem Laufzeitprinzip |
Publications (1)
Publication Number | Publication Date |
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WO2005062001A1 true WO2005062001A1 (de) | 2005-07-07 |
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ID=34706455
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2004/053462 WO2005062001A1 (de) | 2003-12-19 | 2004-12-14 | Verfahren zur füllstandsmessung nach dem laufzeitprinzip |
Country Status (4)
Country | Link |
---|---|
US (1) | US7819002B2 (de) |
EP (1) | EP1695043B1 (de) |
DE (1) | DE10360710A1 (de) |
WO (1) | WO2005062001A1 (de) |
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US7551122B1 (en) | 2007-12-06 | 2009-06-23 | Rosemount Tank Radar Ab | Radar level gauge system and method providing a signal indicative of process reliability |
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DE102004052110B4 (de) | 2004-10-26 | 2018-08-23 | Endress+Hauser SE+Co. KG | Verfahren zur Füllstandsmessung nach dem Laufzeitprinzip |
US7543453B2 (en) * | 2005-12-09 | 2009-06-09 | Whirlpool Corporation | Measured fill water dispenser for refrigerator |
US20080060431A1 (en) * | 2006-09-07 | 2008-03-13 | Christer Frovik | Radar level gauging |
DE102006062606A1 (de) * | 2006-12-29 | 2008-07-03 | Endress + Hauser Gmbh + Co. Kg | Verfahren zur Ermittlung und Überwachung des Füllstands eines Mediums in einem Behälter nach einem Laufzeitverfahren |
WO2009026672A1 (en) * | 2007-08-30 | 2009-03-05 | Sensotech Inc. | Level sensor system for propane tanks and or the likes |
DE102007042042B4 (de) | 2007-09-05 | 2020-03-26 | Endress+Hauser SE+Co. KG | Verfahren zur Ermittlung und Überwachung des Füllstands eines Mediums in einem Behälter nach einem Laufzeitmessverfahren |
DE102008029771A1 (de) * | 2008-06-25 | 2009-12-31 | Endress + Hauser Gmbh + Co. Kg | Anordnung zur Füllstandsmessung |
DE102009001010B4 (de) | 2008-12-30 | 2023-06-15 | Endress+Hauser SE+Co. KG | Verfahren zur Ermittlung und Überwachung des Füllstands eines Mediums in einem Behälter nach einem Laufzeitmessverfahren |
US8283647B2 (en) * | 2009-07-22 | 2012-10-09 | Eastman Kodak Company | Developer liquid level sensor |
DE102009055262A1 (de) | 2009-12-23 | 2011-06-30 | Endress + Hauser GmbH + Co. KG, 79689 | Verfahren zur Ermittlung und Überwachung des Füllstands eines Mediums in einem Behälter nach einem Laufzeitmessverfahren |
DE102010042525A1 (de) | 2010-10-15 | 2012-04-19 | Endress + Hauser Gmbh + Co. Kg | Verfahren zur Ermittlung und Überwachung des Füllstands eines Mediums in einem Behälter mittels eines Füllstandsmessgeräts nach einem Laufzeitmessverfahren |
DE102013103532A1 (de) | 2013-04-09 | 2014-10-09 | Endress + Hauser Gmbh + Co. Kg | Verfahren zur Füllstandsmessung nach dem Laufzeitprinzip |
DE102013107847A1 (de) | 2013-07-23 | 2015-01-29 | Endress + Hauser Gmbh + Co. Kg | Verfahren zur Ermittlung und Überwachung des Füllstands eines Mediums in einem Behälter nach einem Laufzeitmessverfahren |
DE102016114647A1 (de) * | 2016-08-08 | 2018-02-08 | Krohne Messtechnik Gmbh | Verfahren zum Betreiben eines Messgeräts und Messgerät |
DE102016222849B4 (de) * | 2016-11-21 | 2024-03-14 | Audi Ag | Verfahren zur Kalibrierung einer Anzeige eines Füllstands |
DE102017109316A1 (de) | 2017-05-02 | 2018-11-08 | Endress+Hauser SE+Co. KG | Verfahren zur Bestimmung und/oder Überwachung des Füllstands |
DE102018124606A1 (de) * | 2018-10-05 | 2020-04-09 | Endress+Hauser SE+Co. KG | Verfahren zu Füllstandsmessung |
US10760942B1 (en) * | 2019-03-06 | 2020-09-01 | Chevron U.S.A. Inc. | Calibrating measured fill-level of a container based on measurement disruption event detection |
WO2023027943A1 (en) * | 2021-08-25 | 2023-03-02 | Labcyte Inc. | Determining acoustic characteristics of sample containers and fluid samples therein using reflected acoustic signals |
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- 2003-12-19 DE DE10360710A patent/DE10360710A1/de not_active Withdrawn
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2004
- 2004-12-14 WO PCT/EP2004/053462 patent/WO2005062001A1/de active Application Filing
- 2004-12-14 US US10/583,354 patent/US7819002B2/en active Active
- 2004-12-14 EP EP04804820.1A patent/EP1695043B1/de not_active Not-in-force
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US7551122B1 (en) | 2007-12-06 | 2009-06-23 | Rosemount Tank Radar Ab | Radar level gauge system and method providing a signal indicative of process reliability |
Also Published As
Publication number | Publication date |
---|---|
US7819002B2 (en) | 2010-10-26 |
DE10360710A1 (de) | 2005-10-06 |
EP1695043A1 (de) | 2006-08-30 |
US20070214880A1 (en) | 2007-09-20 |
EP1695043B1 (de) | 2016-07-27 |
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