CN101331388B - Level measuring arrangement with a safety cut-out at high temperatures - Google Patents
Level measuring arrangement with a safety cut-out at high temperatures Download PDFInfo
- Publication number
- CN101331388B CN101331388B CN2006800476191A CN200680047619A CN101331388B CN 101331388 B CN101331388 B CN 101331388B CN 2006800476191 A CN2006800476191 A CN 2006800476191A CN 200680047619 A CN200680047619 A CN 200680047619A CN 101331388 B CN101331388 B CN 101331388B
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- temperature
- signal
- oscillation
- threshold temperature
- piezoelectric vibration
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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
- G01F23/2966—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
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- 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
The invention relates to a vibration limit switch arrangement comprising a control device (19, 16) for producing an excitation signal (s) and/or for processing a receiver signal (e), a piezoelectric oscillation device (10, 12) for generating a mechanical oscillation according to the excitation signal and/or for converting a mechanical oscillation into a receiver signal, and an oscillation arrangement (3) for emitting the mechanical oscillation generated by the oscillation device into the surroundings of the oscillation arrangement.; A temperature determination device (19, 17) is used to determine the temperature (T) of the oscillation device (10, 12) and/or the temperature of the surroundings of the oscillation device, and the control device (19) is embodied in such a way as to generate a switching signal (sw) and/or a warning signal (w) when a threshold temperature is reached or according to the temperature (T). The invention also relates to a correspondingly designed method for operating the vibration limit switch.
Description
The present invention relates to a kind of filler level measuring arrangement, and the method for operation vibration mark device switch.
Usually, the vibration mark switchgear that is used to monitor the filler position of container inner medium comprises an oscillating structure that is used to produce mechanical oscillation.Described oscillating structure and an oscillation device are coupled, and wherein said oscillation device is designed to produce the mechanical oscillation that will be delivered on the described oscillating structure based on electric excitation signal.Preferably, this described oscillation device is designed to convert an electrical receive signal with one to by the mechanical oscillation that oscillating structure transmitted simultaneously.Described pumping signal is generated by a control device, and wherein said control device is preferably used in handles described received signal.
The mechanical realization of the oscillating structure form that the vibration mark switch is attached thereto by piezoelectricity transmission/receiving element and of a this oscillation device form usually constitutes.The electricity of transmitting element drives the vibrational energy that energy is converted into machinery, and the beginning of the vibration that is driven thus structure is with its resonance frequency vibration.In opposite mode, electrical receive signal arrives the receiving element by oscillation device constituted.The frequency of this received signal is relevant with the state that the vibration tuning fork is capped with amplitude, thereby obtains the filler position of container, and can analyze it subsequently.
Task of the present invention is, has advised a kind of filler level measuring arrangement, especially vibration mark switchgear, but and a kind of method that is used to operate the device of this trouble free service.
This task solves by the apparatus and method with following feature.
In view of the above, a kind of filler level measuring arrangement is provided, have: be used to the control device that produces electric excitation signal and/or be used to handle electrical receive signal, be used for producing mechanical oscillation and/or being used for mechanical oscillation is converted to the piezoelectric vibration device of described received signal based on described pumping signal, wherein also have: be used for the temperature of definite described piezoelectric vibration device and/or the temperature of the temperature around the described piezoelectric vibration device and determine device, wherein said control device is implemented as and produces switching signal and/or alarm signal when reaching the threshold temperature of determined temperature.
Described control device preferably has the output terminal that is used for output switching signal, described switching signal is used for control linkage filling or emptying equipment thereon, and/or is used under the special state that limits described vibration mark switchgear and/or the filling that is attached thereto or emptying equipment are provided with.Described control device preferably also has the output terminal that is used for the outputting alarm signal, and described alarm signal is used for informing critical excitation with signal.
Preferably also have memory storage, be used for storing at least one prior determined temperature, this temperature is used to analyze the malfunction of vibration mark switchgear or its higher level equipment.
Described temperature determines that device preferably has the thermal element that has balanced lead, is used to produce thermoelectric voltage.Preferably, two thermode settings adjacent one another are (especially being arranged between the ceramic segment and piezoelectric element of described oscillation device) with the Seebeck coefficient that differs from one another.
Especially the temperature analysis device of control device form links to each other with the thermode with the Seebeck coefficient that differs from one another by the balanced lead of insulation, the Seebeck coefficient of each lead of described balanced lead is consistent with the thermode that connects thereon, perhaps has the relation that is limited.
Preferably, described temperature at least one thermode of determining device is constructed in the same manner with the connection electrode of a piezoelectric element that is used to be connected described piezoelectric vibration device and is connected.
In addition, a kind of method that is used to operate the vibration mark switch also is provided, wherein produce pumping signal and it is applied on the piezoelectric vibration device, wherein said piezoelectric vibration device produces mechanical oscillation, and described mechanical oscillation provides by oscillating structure, wherein determine the temperature of described piezoelectric vibration device and/or the temperature around the described piezoelectric vibration device, and when reaching the threshold temperature of determined temperature, produce switching signal and/or alarm signal.
Preferably when reaching threshold temperature, generate described switching signal, so that under the state that is limited, other equipment is provided with, thus the container that filling or emptying are monitored.Especially when reaching threshold temperature, generate described alarm signal, thereby inform critical excitation with signal.Be preferably at least one pre-determined temperature of storage in the memory storage, be used for malfunction being analyzed in the moment of back.The temperature value of the filler in the container that also can determine to be monitored by described temperature.
At such device and in such method, described threshold temperature is set at below the Curie temperature of the piezoelectric that is adopted, and makes described oscillation device to be generated the mechanical oscillation signal and/or to be generated received signal by the mechanical oscillation signal by described pumping signal by interference-free.Described threshold temperature preferably is lower than 10% below Curie temperature, especially be lower than 5%, particularly is lower than 2%.Can use the oscillation device that constitutes by at least one piezoelectric element reliably like this.
When exceeding Curie temperature, depolarization will take place, consequently: transmission and receiving element will be lost its piezoelectric property in the course of work of so setting up.The machinery and the electric implementation that depend on the sensor of structure like this for example become dry or container when overflowing when container, and this may cause the mistake of danger close to take place.
By being provided, temperature determines device, can avoid exceeding the critical threshold temperature that is positioned under the Curie temperature by introducing relative measures, perhaps can activate a kind of mechanism, this mechanism for example allows that entire equipment is stopped or allowing to start or forbid specific device in this kind equipment.Preferably, when reaching Curie temperature or preferably before reaching Curie temperature, just be enough to make the output of the limit filler position indicator of structure like this to enter into the home that is limited, thereby can take counter-measure where necessary in time.By steering needle (Schleppzeiger) preferably the working temperature of maximum is stored in the memory storage such as EEPROM, like this can be after the vibration mark switchgear break down or take place after other disturb in manufacturer or operator, define the possible failure cause of this vibration mark switchgear.
Preferably, the temperature sensor that described temperature is determined device is set near piezoelectricity transmission/receiving element.If specific temperature is sent to described control device or is sent to a dispatching desk via control device, then described control device or dispatching desk and operator can utilize following possibility by way of parenthesis under the temperature between drive unit and the filler descends very little situation: promptly can draw the conclusion about the temperature of the packing medium in the container of being monitored.
What have advantage is, it is a kind of with low cost and save the sensor unit that takes up an area of that the apparatus and method of passing through to be advised provide, and utilizes this sensor unit can monitor the temperature of the Piexoelectric actuator that is used to form oscillation device.
For piezoelectric element or other similar elements of protecting this oscillation device, preferably carry out temperature survey by a thermal resistance chain, described thermal resistance chain is located immediately at the front of temperature-sensing element (device).Measuring a kind of of temperature may be to adopt the metal temperature sensor, known metal temperature sensor such as Pt100 or Pt1000, and they are by its resistance of temperature change.
This class sensor needs to occupy sizable position in the drive unit shell.In addition, propose a kind of placement schemes of the best and remarkable, can not guarantee the potential isolation that realizes by for example ceramic disk between binder dish and the piezoelectric blocks on the hardware that is attached thereto again because make heat conduction suitably be delivered on the diaphragm of oscillating structure of oscillation device or be delivered to.But, this class temperature determine the temperature sensor of device should be as much as possible on possible thermal source direction between thermal source and piezoelectric element.Therefore, the structure that is provided with the electrode with the Seebeck coefficient that differs from one another is particularly preferred.
Set forth embodiments of the invention in more detail by accompanying drawing below.As shown in the figure:
Fig. 1 shows according to the oscillatory system of the vibration mark switchgear of first kind of embodiment and the schematic side elevation of electron device,
Fig. 2 shows the structure according to second kind of embodiment,
Fig. 3 shows the structure according to the third embodiment.
Except the embodiment shown in the figure, also can adopt the special combination of its various aspects, and other embodiment with this more or less class component of number.An important basic thought is, carries out temperature survey in the scope of temperature sensitive element, and utilizes determined temperature like this to influence the operation of vibration mark switch, perhaps and then the operation of the influence miscellaneous equipment of being monitored.In to the explanation that different embodiment carried out, represent identical or similar element or signal with identical Reference numeral respectively, wherein describing second and during the third embodiment, for brevity, with reference to the corresponding description of other each embodiment.
Fig. 1 shows the thin portion of oscillatory system 1 and electron device 2.Used a common vibration tuning fork as mechanical oscillation structure 3.This vibration tuning fork extend in the container at least in part, and the packing medium that monitor its filler position is housed in described container.On the relative side of the packing medium with monitoring of described oscillating structure, be provided with a series of elements, these elements in illustrated embodiment only exemplarily with being laminated to each other and representing by threaded rod 4 and nut 5 element fixing with respect to oscillating structure.But also can adopt other known structure and the method that is used for forming the vibration drive unit that links to each other with the tuning fork that vibrates in principle.
In the exemplary structure that illustrates, be provided with bottom binder dish 6, ceramic component 7, first thermode 8, second thermode 9, piezoelectric element 10, first connection electrode 11, second piezoelectric element 12, second connection electrode 13, another ceramic component 14 and top binder dish 15 in the succusion sounds side of sticking that forms oscillating structure 3, they are fixed with respect to the vibration tuning fork by nut 5.
Electron device 2 also comprises transmission/receiving element 16 especially and determines the ADW input end (ADW: A/D converter) of the processor of device 17 as temperature except other common element.These elements and other element (for example memory storage 18) are to become one or as the building block of the control device 19 of higher level equipment.Like this, control device 19 can be made of each element of interconnection each other, perhaps can be made of independent integrated element under specific circumstances.Transmission/receiving element 16 by control device 19 generates a pumping signal 5, and this pumping signal is applied to first connection electrode 11.Second connection electrode, 13 ground connection m, ground m wherein links to each other with transmission/receiving element 16 or other common ground link as the place of circuit.Temperature determines that device 17 links to each other with first thermode 8 by first lead, and receives thermoelectric voltage t by this lead.In addition, temperature determines that device 17 links to each other with ground m by a ground wire 21, and wherein said ground wire 21 is connected to second thermode 9.As shown in the figure, advantageously, can use and send/the shared ground m of receiving element 16.But also can be provided in principle sending/received signal s, e itself lead 20 and be used for ground wire 21 of driver element itself, and can provide by being used for temperature and determine that ground wire 21 and the lead formed of the thermoelectric voltage lead 22 of itself itself of device 17 itself is right.Shown ground wire 21 and thermoelectric voltage lead 22 have constituted the thermal balance lead.
In this configuration, first thermode 8 that directly is provided with or is encased between first ceramic component 7 and first piezoelectric element 10 has constituted the electrode pair with different Seebeck coefficients with second thermode 9.Thereby potential isolation occurred, and determined vessel temp T0, as the temperature T that acts on the piezoelectric element 10,12 by oscillating structure 3 piezoelectric element that acts on 10,12 fronts of container outside.In order to determine the absolute temperature T in this zone, have thermal resistance shown in the structure, need to measure the break-even point temperature that occurs at wire end.This temperature for example determines that by temperature sensor that is positioned at processor or temperature device 17 measures in electron device 2, and as absolute temperature T by control device 19 outputs or use.This absolute temperature T for example can be calculated by the thermoelectric voltage of corresponding suitably software by first and second thermodes 8,9.
According to a kind of particularly preferred embodiment, use the insulation output lead of ground wire 21 and thermoelectric voltage lead 22 forms, its Seebeck coefficient should be as far as possible accurately consistent with the Seebeck coefficient of the thermode 8,9 that is connected thereto.As example, possible thermopair is for example formed by NiCr+/Ni-or NiCr+/CuNi-.Preferably, in order to make electron device 2 and balanced measurement point suitable, do not exist temperature to descend between the transitional region of the balanced lead on the copper conductor, because otherwise will produce further thermoelectric voltage, it will make measurement result make mistakes and need correspondingly calculate.But preferably, also can compensate the thermoelectric voltage t at the transition point place that is located immediately between thermopair and the copper conductor or the temperature at measurement transition point place, and can the measurement result that processor obtained be compensated with software with corresponding wiring.
If can omit the necessity of potential isolation, also there is following possibility, promptly save a thermode in the described thermode, adopt a diaphragm in this structure to replace, as second thermode.
In order further to save cost, described two thermodes also can by one arbitrarily metal electrode replace.For this reason, as shown in Figure 2, thermal wire directly links to each other with such electrode.Have much higher thermal conduction capability because this metal connection is compared with air, can obtain thermoelectric voltage equally, it has comprised the information about the temperature that is located immediately at the piezoelectric element front.
What Fig. 1 was different is, Fig. 2 does not correspondingly illustrate first and second thermodes, but only show first thermode 8 between first ceramic component 7 and first piezoelectric element 10, and correspondingly preferably directly adjacent with thermode 8 tie point 23, this tie point is connected with each other ground wire 21 and thermoelectric voltage lead 22.Another kind of general aspect and more compact structure is shown in Figure 3 wherein according to simple especially substitution principle, is measured the temperature T that is positioned at by the set Piexoelectric actuator front of technique for sticking and/or welding technology.Wherein, be arranged on ceramic segment 7 on the oscillating structure 3 above, thermode 8, piezoelectric element 10 and connection electrode 13 be each other directly by bonding and/or welding manner setting, wherein as shown in other accompanying drawing, the expression that is spaced from each other of each element is so that can more clearly draw.Also construct a tie point 23 near being preferably in thermode 8, wherein this tie point 23 couples together ground wire 21 and thermoelectric voltage lead equally.Connection electrode 13 also connects by connecting lead 20, sends signal s and received signal e with transmission.
All these three kinds of embodiments have been expressed an exemplary memory storage of drawing 18, can also store except running parameter by the determined temperature of described configuration where necessary in this memory storage.This can read the temperature of so determining subsequently under disturbance regime, thereby can determine to disturb owing to temperature is too high that cause or may cause owing to other reason.
Preferably, control device 19 is provided with to export dissimilar signals as required.Preferably, can be by a specific temperature T of corresponding terminal output.Preferably, also can pass through other terminal output switching signal sw and/or alarm signal w.For example can start or forbid pump or miscellaneous equipment by means of switching signal, thereby avoid the container of being monitored to occur unloaded or overflow by the vibration mark switchgear of such structure.Advantageously, control device 19 is also considered threshold temperature T for the monitoring purpose
*, in the zone of piezoelectric element 8,9, should or not allow to surpass this threshold temperature, work error-free guaranteeing.Especially reaching this threshold temperature T
*The time export corresponding switching signal sw and alarm signal w.
Threshold temperature (T
*) preferably determine according to employed piezoelectric element 10,12, thereby the critical working temperature of considering piezoelectric element is guaranteed interference-free work.Concerning considering for by piezoelectric element or have and very important meaning is arranged the oscillation device that the like of similar physical properties constitutes of Curie temperature.
Claims (25)
1. filler level measuring arrangement has:
-be used to the control device (19) that produces electric excitation signal (s) and/or be used to handle electrical receive signal (e),
-be used for producing mechanical oscillation and/or being used for mechanical oscillation is converted to the piezoelectric vibration device (10,12) of described received signal (e) based on described pumping signal (s),
It is characterized in that also having:
-be used for determining that the temperature of described piezoelectric vibration device (10,12) and/or the temperature of described piezoelectric vibration device (10,12) temperature on every side determine device (17),
Wherein said control device (19) is implemented as and produces switching signal (sw) and/or alarm signal (w) when reaching the threshold temperature of determined temperature.
2. device according to claim 1, wherein said control device (19) has the output terminal that is used for output switching signal (sw), described switching signal is used for control linkage filling or emptying equipment thereon, and/or is used under the special state that limits vibration mark switchgear and/or the filling that is attached thereto or emptying equipment are provided with.
3. device according to claim 1 and 2, wherein said control device (19) has the output terminal that is used for outputting alarm signal (w), and described alarm signal is used for informing critical excitation with signal.
4. device according to claim 1, it has memory storage (18), and described memory storage is used to store at least one prior determined temperature, and this temperature is used to analyze the malfunction of vibration mark switchgear or its higher level equipment.
5. device according to claim 1, wherein said temperature determine that device (17) has the thermal element that has balanced lead (8,9,21,22), is used to produce thermoelectric voltage (t).
6. device according to claim 5, wherein two thermode (8,9) settings adjacent one another are with the Seebeck coefficient that differs from one another are as described thermal element.
7. device according to claim 6, wherein two thermodes (8,9) with the Seebeck coefficient that differs from one another are arranged between the ceramic segment (7) and piezoelectric element (10) of described oscillation device.
8. according to claim 6 or 7 described devices, wherein the temperature analysis device is by the balanced lead (21 of insulation, 22) with thermode (8 with the Seebeck coefficient that differs from one another, 9) link to each other, the Seebeck coefficient of each lead of described balanced lead and the thermode (8 that is connected thereon, 9) consistent, perhaps have the relation that is limited.
9. device according to claim 8, wherein said temperature analysis device are control device (19).
10. according to claim 6 or 7 described devices, at least one thermode that wherein said temperature is determined device is constructed in the same manner with the connection electrode of a piezoelectric element (10) that is used to be connected described piezoelectric vibration device and is connected.
11. device according to claim 11, wherein said threshold temperature (T
*) be set at below the Curie temperature, make described piezoelectric vibration device to generate the mechanical oscillation signal and/or to generate received signal (e) by described pumping signal (s) by interference-free by the mechanical oscillation signal.
12. device according to claim 11, wherein said threshold temperature (T
*) below Curie temperature, be lower than 10%.
13. device according to claim 12, wherein said threshold temperature (T
*) below Curie temperature, be lower than 5%.
14. device according to claim 13, wherein said threshold temperature (T
*) below Curie temperature, be lower than 2%.
15. device according to claim 1, wherein said oscillation device (10,12) is made of at least one piezoelectric element.
16. a method that is used to operate the vibration mark switch, wherein
-producing pumping signal (s) and it is applied on the piezoelectric vibration device (10,12), wherein said piezoelectric vibration device produces mechanical oscillation, and described mechanical oscillation provides by oscillating structure (3),
It is characterized in that,
-determine the temperature and/or described piezoelectric vibration device (10, the 12) temperature on every side of described piezoelectric vibration device (10,12), and
-as the threshold temperature (T that reaches determined temperature
*) time produce switching signal (sw) and/or alarm signal (w).
17. method according to claim 16 is wherein reaching threshold temperature (T
*) time generate described switching signal (sw) so that under the state that is limited, other equipment is provided with, thereby fill or container that emptying is monitored.
18., wherein reaching threshold temperature (T according to claim 16 or 17 described methods
*) time generate described alarm signal (w), thereby inform critical excitation with signal.
19. method according to claim 16, wherein at least one pre-determined temperature of storage in memory storage (18) is used in the moment of back malfunction being analyzed.
20. method according to claim 16, the wherein temperature value of the filler in the container of determining to be monitored by described determined temperature.
21. method according to claim 16, wherein said threshold temperature (T
*) be set at below the Curie temperature, make described piezoelectric vibration device to generate the mechanical oscillation signal and/or to generate received signal (e) by described pumping signal (s) by interference-free by the mechanical oscillation signal.
22. method according to claim 21, wherein said threshold temperature (T
*) below Curie temperature, be lower than 10%.
23. method according to claim 22, wherein said threshold temperature (T
*) below Curie temperature, be lower than 5%.
24. method according to claim 23, wherein said threshold temperature (T
*) below Curie temperature, be lower than 2%.
25. according to each described method in the above claim, wherein said oscillation device (10,12) is made of at least one piezoelectric element.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005062813A DE102005062813B4 (en) | 2005-12-27 | 2005-12-27 | Level measuring system with safety shutdown at high temperatures |
| DE102005062813.3 | 2005-12-27 | ||
| PCT/EP2006/011698 WO2007073837A2 (en) | 2005-12-27 | 2006-12-06 | Level measuring arrangement with a safety cut-out at high temperatures |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101331388A CN101331388A (en) | 2008-12-24 |
| CN101331388B true CN101331388B (en) | 2011-02-16 |
Family
ID=37726979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800476191A Expired - Fee Related CN101331388B (en) | 2005-12-27 | 2006-12-06 | Level measuring arrangement with a safety cut-out at high temperatures |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1966569A2 (en) |
| CN (1) | CN101331388B (en) |
| DE (1) | DE102005062813B4 (en) |
| WO (1) | WO2007073837A2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2711627T3 (en) | 2006-12-28 | 2019-05-06 | Pioneer Hi Bred Int | Genetic markers for resistance to orobanca in sunflower |
| DE102009029490B4 (en) | 2009-09-16 | 2023-09-28 | Endress+Hauser SE+Co. KG | Level measuring device |
| DE102010002608A1 (en) | 2009-12-29 | 2011-06-30 | Endress + Hauser GmbH + Co. KG, 79689 | Device for determining at least one process variable |
| DE102010030791A1 (en) * | 2010-07-01 | 2012-01-05 | Endress + Hauser Gmbh + Co. Kg | Device for determining and / or monitoring a process variable of a medium |
| DE102011090015B4 (en) * | 2011-12-28 | 2023-12-28 | Endress+Hauser SE+Co. KG | Device for determining and/or monitoring at least one process variable |
| DE102013109277A1 (en) | 2013-08-27 | 2015-03-05 | Endress + Hauser Gmbh + Co. Kg | Device for determining or monitoring a process variable |
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU517312B2 (en) * | 1978-11-02 | 1981-07-23 | Andreevich Markelov And Anatoly Alexandrovich Baranovsky Vsevolod | Vibrating rod level detector |
| EP0282251A2 (en) * | 1987-03-11 | 1988-09-14 | Solartron Group Limited | Fluid transducer |
| CN1086900A (en) * | 1992-11-07 | 1994-05-18 | 浙江大学 | Vibrative powder storehouse powder position monitoring method and device |
| CN1435679A (en) * | 2002-01-28 | 2003-08-13 | 维加·格里沙伯股份公司 | Oscillation limit state sensor |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3712117A (en) * | 1971-01-12 | 1973-01-23 | Nat Metal & Refining Co | High precision wide dynamic range viscous loss measuring apparatus |
| NL8801836A (en) * | 1988-07-20 | 1990-02-16 | Enraf Nonius Delft | DEVICE FOR DETERMINING THE LEVEL OF THE BOUNDARY AREA BETWEEN A FIRST AND A SECOND MEDIUM IN A RESERVOIR. |
| GB9122704D0 (en) * | 1991-10-25 | 1991-12-11 | Secretary Trade Ind Brit | Sensors |
| US6073492A (en) * | 1998-12-17 | 2000-06-13 | Kay-Ray Sensall, Inc. | Ultrasonic sensor for very high temperatures and pressures |
| US6548416B2 (en) * | 2001-07-24 | 2003-04-15 | Axcelis Technolgoies, Inc. | Plasma ashing process |
| US6714880B2 (en) * | 2002-05-13 | 2004-03-30 | Entek Ird International Corporation | Multi-alarm monitoring and protection system |
| DE10237931A1 (en) * | 2002-08-14 | 2004-02-26 | Endress + Hauser Gmbh + Co. Kg | Fixed, filling level monitoring, density, and viscosity measurement device, comprises a vibrator fixed at a chosen level, with a microprocessor to control feedback electronics to provide a constant phase-frequency response |
| DE10349309A1 (en) * | 2003-10-23 | 2005-05-25 | Siemens Ag | Actuator with a temperature sensor and method of manufacturing such an actuator |
| US7260977B2 (en) * | 2004-08-02 | 2007-08-28 | Vega Grieshaber Kg | Self-diagnosis of a vibrating level gauge |
| DE102005015546A1 (en) * | 2005-04-04 | 2006-10-05 | Endress + Hauser Gmbh + Co. Kg | Liquid medium`s process variable e.g. level, measuring device for e.g. monitoring process variable, has detection unit provided to determine and/or control pressure in direction perpendicular to diaphragm by vibrating diaphragm |
-
2005
- 2005-12-27 DE DE102005062813A patent/DE102005062813B4/en not_active Expired - Fee Related
-
2006
- 2006-12-06 EP EP06829332A patent/EP1966569A2/en not_active Withdrawn
- 2006-12-06 WO PCT/EP2006/011698 patent/WO2007073837A2/en active Application Filing
- 2006-12-06 CN CN2006800476191A patent/CN101331388B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU517312B2 (en) * | 1978-11-02 | 1981-07-23 | Andreevich Markelov And Anatoly Alexandrovich Baranovsky Vsevolod | Vibrating rod level detector |
| EP0282251A2 (en) * | 1987-03-11 | 1988-09-14 | Solartron Group Limited | Fluid transducer |
| CN1086900A (en) * | 1992-11-07 | 1994-05-18 | 浙江大学 | Vibrative powder storehouse powder position monitoring method and device |
| CN1435679A (en) * | 2002-01-28 | 2003-08-13 | 维加·格里沙伯股份公司 | Oscillation limit state sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101331388A (en) | 2008-12-24 |
| DE102005062813A1 (en) | 2007-07-05 |
| WO2007073837A3 (en) | 2007-08-16 |
| DE102005062813B4 (en) | 2009-11-26 |
| EP1966569A2 (en) | 2008-09-10 |
| WO2007073837A2 (en) | 2007-07-05 |
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