WO2012113882A2 - Capteur de flux et procédé pour détecter un flux - Google Patents

Capteur de flux et procédé pour détecter un flux Download PDF

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Publication number
WO2012113882A2
WO2012113882A2 PCT/EP2012/053099 EP2012053099W WO2012113882A2 WO 2012113882 A2 WO2012113882 A2 WO 2012113882A2 EP 2012053099 W EP2012053099 W EP 2012053099W WO 2012113882 A2 WO2012113882 A2 WO 2012113882A2
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WO
WIPO (PCT)
Prior art keywords
magnetic field
sensor
flow
field sensor
microcontroller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2012/053099
Other languages
German (de)
English (en)
Other versions
WO2012113882A3 (fr
Inventor
Philipp Becker
Dirk Spreemann
Alexander Willmann
Bernd Folkmer
Lothar Wittig
Rainer Nackenhorst
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LASLO GmbH
Hann Schickard Gesellschaft fuer Angewandte Forschung eV
Original Assignee
LASLO GmbH
Hann Schickard Gesellschaft fuer Angewandte Forschung eV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LASLO GmbH, Hann Schickard Gesellschaft fuer Angewandte Forschung eV filed Critical LASLO GmbH
Priority to EP12710172.3A priority Critical patent/EP2678642A2/fr
Publication of WO2012113882A2 publication Critical patent/WO2012113882A2/fr
Publication of WO2012113882A3 publication Critical patent/WO2012113882A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
    • G01F1/28—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by drag-force, e.g. vane type or impact flowmeter

Definitions

  • the present invention is in the field of flow sensors and methods for detecting a flow, in particular those sensors and methods capable of measuring a low energy flow rate, to provide flow through conduits, for example in water-system systems,
  • a flow in particular those sensors and methods capable of measuring a low energy flow rate
  • various possibilities are known.
  • One method is the differential pressure method in which the differential pressure increases quadratically with the flow, which is why the pressure sensor used must cover a very large measuring range.
  • Another possibility is a volumetric meter, with turbine or measuring mills being used having a relatively large slip, so that the measurement of low flow rates can not be realized.
  • the installation position In the case of a float flow measurement, the installation position must be ensured, since a resistance body flows vertically from bottom to top.
  • a conductive liquid flows through a time-varying magnetic field, the generation of such a magnetic field requires too much energy, so that the system can not be realized energy self-sufficient.
  • An ultrasonic flow measurement measures the superposition of the speed of sound with the flow velocity, whereby the generation of ultrasound requires a great deal of energy.
  • the thermal heaters require a very high energy requirement, so that such flow meters also require too much energy, so that corresponding systems can not be realized in an energy-autonomous manner.
  • Optical systems used in an optical flow measurement must be permanently supplied with energy, so that they are not suitable for energy self-sufficient systems.
  • a fluidic device in which a Fluidikele- ment is movably arranged in a fluid line.
  • the fluidic element may have a throughflow opening in which a check valve is arranged.
  • the fluidic element may at least partially consist of a magnetizable material, wherein a magnetic field sensor may be provided to conclude from a change in a measured magnetic field to a location and / or a movement of the fluidic element.
  • the object of the present invention is to provide a flow sensor and a method for detecting a flow, which make it possible to detect a flow through a fluid path with a low energy input. This object is achieved by a flow sensor according to claim 1 and a method for detecting a flow according to claim 15.
  • Embodiments of the invention provide a flow sensor having the following features; a check valve disposed in a fluid conduit having a valve seat and a closure member; and a magnetic field sensor, wherein the closure member has a magnetic encoder or is mechanically coupled to a magnetic encoder so that movement of the closure member relative to the valve seat results in movement of the magnetic encoder relative to the magnetic field sensor and wherein the magnetic field sensor is arranged to move of the magnetic field sensor relative to the magnetic field sensor to detect, so that an output signal of the magnetic field sensor is a measure of the opening degree of the check valve.
  • Embodiments of the invention provide a method for detecting a flow, comprising the following steps:
  • the relative position of a closure member of a check valve to the valve seat of the check valve is magnetically detected by a magnetic field sensor, wherein the check valve is arranged in a fluid line, so that a leakage flow past the check valve can not take place.
  • the present invention enables both the detection of flow rates over a large measurement ranges.
  • a flow measurement is advantageously possible while simultaneously preventing a flow in a direction opposite to the flow direction of the flow to be measured.
  • AMR anisotropic magnetoresistive
  • GMR tunnel magnetoresistive effect
  • FMR tunnel magnetoresistive effect
  • CMR co-lossal magnetoresistive
  • GME giant magnetic inductance
  • the flow sensor includes a microcontroller coupled to the magnetic field sensor and configured to receive the output of the magnetic field sensor and determine a flow rate based thereon.
  • the microcontroller may be further configured to output, for example, display a flow rate indicative signal or to transmit wirelessly or by wire to a receiver.
  • the microcontroller may be configured in embodiments of the invention to switch the magnetic seed sensor between a measurement phase and a quiescent phase with a predetermined duty cycle, and energy consumption can be further reduced by appropriately adjusting the duty cycle.
  • a magnetic field switch is further provided whose task is to wake the system comprising the MikrocontroUer and the magnetic field sensor. Thus, the system is only active when needed, so that the energy consumption can be further reduced.
  • the magnetic field switch may be implemented, for example, as a GMR magnetic field switch.
  • the magnetic field switch itself can take over the function of a magnetic field sensor which can detect a fixed threshold so that the flow sensor acts as a threshold switch.
  • Embodiments of the present invention thus make it possible to detect a flow in a fluid conduit, for example a water flow in a water conduit, with a very low energy requirement, whereby both small dripping quantities and large flow rates can be detected and measured.
  • it is not necessary to use different types of sensors in order to measure both small dripping volumes and high flow rates of several liters per minute, as is the case with current systems. In current systems, this is necessary because the individual sensor types usually cover only a small measuring range with the required accuracy.
  • conventional flow sensors typically use physical principles to measure a flow, such as a flow of water, associated with a high energy demand.
  • the present invention provides flow sensors and methods for detecting flow that have lower energy consumption, less slippage, and a wider range of measurement.
  • embodiments of the present invention are suitable for applications for which known systems are excluded due to the mentioned disadvantages.
  • embodiments of the invention are suitable for sensors that are capable of detecting and measuring the water flow in water lines with extremely low energy consumption, so that the use of battery-operated measuring and control systems becomes possible.
  • the use of energy harvesting to supply power to monitoring systems (such as condition monitoring systems) is also made possible for the first time by the use of such systems.
  • Fig. 2a) to 2c) are schematic representations showing an embodiment of a flow sensor according to the invention in various states;
  • Fig. 3 is a schematic representation of an alternative embodiment of a flow sensor according to the invention.
  • FIG. 1 shows an embodiment of the invention, in which a check valve 10 is installed in a fluid line 12, for example, a water pipe.
  • the check valve has a valve seat 14 in the form of a sealing ring.
  • the sealing ring is attached to suitable attachment means in 16 in the fluid conduit 12.
  • the check valve 10 also has a closing cone 1 8, which is resiliently mounted against the valve seat 14, as indicated in Fig. 1 by a spring 20.
  • the closing cone 18 has a magnetic field transmitter 22, as shown schematically in FIG.
  • the closing cone 1 8 either consist of a magnetic material or a magnet may be attached to the closing cone.
  • the magnetic encoder 22 generates a magnetic field 24, as shown by corresponding field lines in FIG.
  • the check valve 10 is configured to allow fluid flow only in a direction shown by an arrow 26 in FIG. 1.
  • a fluid flow in the direction of the arrow 26 generates a force acting on the closing cone 1 8 force, so that the closing cone 1 8 lifted from the valve seat 14 and the valve is opened.
  • the degree of opening of the valve depends on the flow rate, ie on the flow rate.
  • a magnetic field sensor 28 is arranged in a suitable position relative to the check valve 10 and thus to the magnetic encoder 22 in a suitable position relative to the check valve 10 and thus to the magnetic encoder 22, a magnetic field sensor 28 is arranged.
  • the magnetic field sensor 28 is arranged at such a position relative to the check valve 10 that its output signal depends on the position of the closing cone 18, which in turn depends on the flow rate of the fluid flowing through the fluid line. This dependence is indicated in a diagram 30 in FIG. 1, which represents the output voltage U of the magnetic field sensor 28 over time t.
  • the magnetic field sensor is formed by a GMR sensor.
  • the magnetic field sensor is thus arranged relative to the closing cone 18 and thus the magnetic field transmitter 22, that a movement of the closing cone 18 and thus the magnetic encoder 22 leads to a change of the output signal of the magnetic field sensor, so that the output signal of the magnetic field sensor is a measure of the degree of opening of Check valve is.
  • Figures 2a) -2c) show the output signal of the Magnetfeidsensors 28 for different degrees of opening of the check valve. According to Fig. 2a) no flow takes place, so that the check valve 10 is closed.
  • the magnetic field sensor 28 is thus exposed to only a small part of the magnetic field generated by the magnetic encoder 22, so that the output signal of the magnetic field sensor 28 is at a low level, as indicated by the low output voltage in the diagram 30a in Fig. 2a).
  • a first low flow through the conduit 12 takes place, so that the check valve 10 is slightly open.
  • the magnetic field transmitter 22 is moved by the deflection of the check valve 1 8 to the magnetic field sensor 28, so that the output signal thereof has a higher level, see diagram 30b.
  • Fig. 2c) finally, a second high flow takes place, so that the magnetic encoder was moved by the deflection of the check valve 1 8 even closer to the magnetic field sensor 28, so that it is the generated magnetic field 24 more exposed.
  • the output of the magnetic field sensor 28 has a correspondingly higher level, as shown in diagram 30c.
  • a corresponding flow sensor can be operated with a very low energy requirement.
  • the power requirements of conventional GMR sensors can be around 9 mW.
  • corresponding embodiments of the invention enable flow detection with a low energy requirement.
  • FIG. 3 shows a schematic cross-sectional view of an alternative embodiment of the invention designed to enhance the measurement effect.
  • 3 shows a flow sensor arrangement with a first connecting piece 32, a second connecting piece 34 and a fluid channel connecting the connecting pieces.
  • the fluid channel is indicated in Fig. 3 by a line 36.
  • a check valve 40 is arranged, which has a valve seat 42 and a closure element in the form of a ball 44.
  • the ball 44 may be biased against the valve seat 42 by gravitational force.
  • the ball 44 is attached to a lever arm 46 to which a magnetic encoder 48, for example in the form of a magnet, is also attached.
  • the lever arm 46 is clamped at the end to which the ball 44 is mounted while the magnetic encoder 48 is mounted at the other end thereof.
  • the ball 44 is moved upward in the direction of the arrow 50. This movement is translated by the lever arm 46 into a larger movement of the magnet 48, as shown by an arrow 52 in FIG.
  • the deflection of the magnetic encoder 48 according to the law of leverage corresponds to a multiple of the movement of the ball. This increased according to the length of the lever deflection can be detected by a magnetic field sensor 54 which is opposite to the magnetic encoder 48.
  • embodiments of the invention can thus be effected by providing a lever, an enlarged deflection of parts of a flow element, said increased deflection can be detected by a magnetic field sensor, so that the measurement accuracy can be increased.
  • a microcontroller configured to return to flow through the fluid conduit based on the output of the magnetic field sensor.
  • the microcontroller may be programmed to access, based on the output signal of the magnetic field sensor, a look-up table in which flow rates associated with different output signals are stored, the data of the lookup table being obtainable by calibration of the system.
  • the microcontroller may be configured to operate the magnetic field sensor with a duty cycle that describes the ratio between the active phase of the magnetic field sensor and the idle phase thereof. In the active phase, the magnetic field sensor is powered and provides output signals, while it is not powered in the resting phase and thus consumes no energy.
  • the duty cycle may be suitably chosen to provide a trade-off between the behavior of the flow sensor and its power consumption.
  • the output of the magnetic field sensor is evaluated by means of a microcontroller, which may be configured to access a look-up table based on the output of the magnetic field sensor based on calibration data.
  • the look-up table can also take into account further parameters which may have an influence on the measured flow, for example the temperature present during the measurement. For detecting these further parameters, additional sensors, for example a temperature sensor, may be provided.
  • the lookup nozzles may be calibrated for a particular fluid whose flow is to be measured, for example, water. Alternatively, the look-up table may contain data for multiple fluids, with a possibility to select between the fluids.
  • an additional magnetic field switch may be provided by which the system only then aroused when a flow through the fluid line takes place.
  • the magnetic field switch may be implemented by a GMR switch, for example, where the power requirements of typical GMR switches may be 400 nW.
  • the magnetic field switch, as well as the magnetic field sensor, mounted on a position where he can observe the movement of the check valve, ie, where he can observe the relative movement between the closure element and the valve seat.
  • FIGS. 4a and 4b An exemplary embodiment of a flow sensor according to the invention, in which a sensor unit 100 has a magnetic field switch 102, a magnetic field sensor 104 and a microcontactor 106, is shown in FIGS. 4a and 4b.
  • the microcontroller is electrically coupled to the magnetic field switch 102 and the magnetic field sensor 104, as indicated by arrows 108 in FIG. 4a.
  • Fig. 4a the check valve 1 0 is shown in a closed state, in this state, the magnetic field sensor 1 04 and the microcontroller 1 06 are in a sleep mode.
  • a sleep mode of a magnetic field sensor is to be understood as meaning a mode in which the magnetic field sensor is not supplied with energy and thus does not consume any energy.
  • Sleep mode of the microcontroller is a mode in which the power consumption of the microcontroller is reduced compared to an active mode by turning off components of the microcontroller, ie. H. not be energized. For example, during sleep mode of the microcontroller, only one timer may be active.
  • Such sleep modes of microcontrollers are known, wherein microcontroller can be woken up, for example by a Signaiii ske at an interrupt input from the sleep mode.
  • an interrupt input of the microcontroller 106 can thus be connected to an output of the magnetic field switch 102, so that the microcontroller can be awakened from the sleep mode into the active mode by a signal edge in the output signal of the magnetic field switch 102.
  • the microcontroller is configured to activate the magnetic field sensor after placing it in the active mode to measure the flow through the line 1 2.
  • the microcontroller 1 06 and the magnetic field sensor 1 04 are in the closed state of the .Rücktschventils 1 10 shown in Fig. 4a in sleep mode in which the magnetic field sensor can be completely disabled.
  • the magnetic switch 102 is active and monitors the position of the valve. As the valve moves, this movement is detected by the magnetic switch 102. More specifically, the magnetic field switch 102 detects a change in the magnetic field caused by a movement of the magnetic field sensor 22 and switches when the magnetic field caused by the magnetic encoder 22 netfeld assumes or exceeds a predetermined value. As a result, a signal edge is generated in the output signal of the magnetic switch 22, which starts the microcontroller 1 06 via an interrupt.
  • the microcontroller 1 06 is put into an active mode and in turn activates the magnetic field sensor 1 04.
  • the magnetic field sensor carries out measurements in order to determine the exact position of the valve, in particular of the closure element 18.
  • the functionality of the magnetic field sensor corresponds to the functionality described above with reference to FIGS. 1 and 2.
  • the magnetic field switch can be placed in a sleep mode in which it is not energized when the microcontroller and the magnetic field sensor are in the active mode. In such embodiments, the magnetic field switch is again put in an active mode when the microcontroller and the magnetic field sensor are put into sleep mode.
  • the microcontroller can also be put into sleep mode by a further edge in the output signal of the magnetic switch 102 from the active mode, wherein such a signal edge can be generated in the output signal of the magnetic switch 102, if caused by the magnetic encoder Magnetic field again assumes the predetermined value or crosses.
  • a further magnetic field switch may be provided which is configured to generate in an output thereof a digital signal handler when the magnetic field caused by the magnetic transmitter assumes a second predetermined value.
  • the second predetermined value may for example be associated with a specific opening position of the valve, for example an opening end position of the valve.
  • the further magnetic field switch can be coupled to the microcontroller 1, in such a way that the microcontroller is put into sleep mode when the signal edge occurs in the output signal of the second magnetic field switch.
  • the switching threshold of the magnetic switch can be set so that, while the check valve is closed, the threshold is not exceeded.
  • the check valve moves and the digital output of the magnetic switch changes from one binary value to another, for example from 0 to 1 or vice versa.
  • This edge change is used to wake up and activate the microcontroller and thus also the magnetic field sensor with the aid of an interrupt.
  • the magnetic field sensor begins to accurately measure the position of the valve and once the measurement is completed, the magnetic field sensor and the microcontroller are put back into sleep mode.
  • the magnetic field sensor only needs energy when a fluid flow really takes place. In the time when no flow takes place, the magnetic field sensor is completely inactive.
  • the switching threshold can be set so that the system is activated only when a threshold, which represents the lower limit of a certain measuring range is reached.
  • a magnetic field switch itself act as a magnetic field sensor, wherein the magnetic field switch takes over the task of detecting a predetermined threshold.
  • threshold levelers can be realized, which switch from a previously set amount of flow.
  • An additional magnetic field sensor which makes an accurate qualitative measurement of the magnetic field is not provided in such embodiments.
  • FIG. 1 A functional block diagram of a magnetic field switch as may be used in embodiments of the present invention is shown in FIG.
  • the magnetic field switch comprises an oscillator and timer 1 10, a sensor element 1 12, a Kornparator 1 14, a latch 1 16 and a switch 1 18, for example in the form of a field effect transistor.
  • the output of the oscillator and timer 110 is coupled to the sensor element 12 and the comparator 14 to apply a suitable measurement cycle, as indicated by pulses 120 in FIG.
  • a supply voltage V DD is shown in FIG.
  • the sensor element 1 12 may be formed, for example, as a Wheatstone bridge, wherein the output signal of the comparator 26 depending on the magnetic field detected by the sensor element 1 12 has a high or low level.
  • the output of the comparator 1 14 is coupled to an input of the latch 1 1 6, whose output is in turn coupled to a control terminal of the switch 1 1 8.
  • the switch 18 leaves an output 122 of the magnetic switch 102 at a high logic level or pulls it to a low logic level. At the output 122 thus a digital output signal is output, which can assume a logic high or logic low level.
  • the magnetic field switch can be designed as a GMR magnetic field switch by the sensor element 1 12 is designed as a GMR sensor element.
  • the sensor element 1 12 is designed as a GMR sensor element.
  • no offset correction is necessary because the magnetoresistive material used in the GMR sensor element does not magnetize irreversibly. Examples of such a sensor draw in the operating mode on average only a current of about 0, 1 2 ⁇ .
  • Embodiments of the present invention have been described above with reference to a check valve in which a closing cone or ball releases or closes a valve opening formed by a valve seat.
  • Alternative embodiments of the invention may use other check valves, for example
  • Flap valves or the like as long as the movable closure member is mechanically coupled to a magnetic encoder that a movement of the VerMedicclements is converted into a movement of the magnetic encoder, so that a position of the closure member relative to the valve seat can be detected by a corresponding magnetic field sensor.
  • the magnetic encoder can be formed by a permanent magnet.
  • the magnetic field encoder can consist of a magnetizable material, so that an external, for example, by an external permanent magnet, generated magnetic field can be changed by the magnetic encoder, this change is in turn detected by the magnetic field sensor.
  • Embodiments of the invention thus relate to a flow sensor in which a passage valve is arranged in a fluid line such that no flow can take place past the check valve.
  • Embodiments of the present invention further relate to corresponding methods for detecting flow through a fluid conduit that are executable by corresponding flow sensors.
  • Embodiments of the present invention thus enable the realization of a sensor for flow detection, which were not possible with previous technologies, in particular the implementation of self-powered or battery-powered systems.
  • embodiments of the invention may be used to implement
  • Embodiment embodiments of the invention make it possible to detect both very small flow quantities in the drop zone and very large flows of several liters per minute. Possible uses for embodiments of the invention include measurement and control of the flow and / or detection of leakage in lines of water consumers, such as e.g. Irrigation systems, washing machines, dishwashers, vending machines, water dispensers, coffee machines and the like.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)
  • Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)

Abstract

L'invention concerne un capteur de flux qui comprend un clapet anti-retour monté dans une conduite de fluide et doté d'un siège et d'un élément de fermeture, ainsi qu'un capteur de champ magnétique. L'élément de fermeture présente un transducteur de champ magnétique ou est couplé à un transducteur de champ magnétique, de manière qu'un mouvement du transducteur de champ magnétique par rapport au capteur de champ magnétique induise un mouvement de l'élément de fermeture par rapport au capteur de champ magnétique. Ledit capteur de champ magnétique est disposé de manière à détecter un mouvement du transducteur de champ magnétique par rapport au capteur de champ magnétique de sorte qu'un signal de sortie du capteur de champ magnétique constitue une grandeur du degré d'ouverture du clapet anti-retour.
PCT/EP2012/053099 2011-02-25 2012-02-23 Capteur de flux et procédé pour détecter un flux Ceased WO2012113882A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12710172.3A EP2678642A2 (fr) 2011-02-25 2012-02-23 Capteur de flux et procédé pour détecter un flux

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011004743.3 2011-02-25
DE201110004743 DE102011004743B4 (de) 2011-02-25 2011-02-25 Flusssensor und Verfahren zum Erfassen eines Flusses

Publications (2)

Publication Number Publication Date
WO2012113882A2 true WO2012113882A2 (fr) 2012-08-30
WO2012113882A3 WO2012113882A3 (fr) 2013-01-03

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DE (1) DE102011004743B4 (fr)
WO (1) WO2012113882A2 (fr)

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CN107843742A (zh) * 2017-11-28 2018-03-27 佛山科学技术学院 一种化学液体输送管流速感应结构
DE102021106079A1 (de) 2021-03-12 2022-09-15 Grohe Ag Sanitärarmatur mit einem Durchflusssensor
DE102022129750A1 (de) * 2022-11-10 2024-05-16 Grohe Ag Fluiddurchströmbares, elektrisch betreibbares Bauelement
DE102024111722A1 (de) * 2024-04-25 2025-10-30 Ifm Electronic Gmbh Messanordnung mit zumindest einem mechatronischen Strömungssensor sowie ein Kühlmittelschmierstoffsystem

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WO2009083179A1 (fr) 2008-01-02 2009-07-09 Hahn-Schickard-Gesellschaft für angewandte Forschung e.V. Dispositif fluidique pour la manipulation contrôlée de liquides et système fluidique équipé d'un dispositif fluidique

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DE3101072A1 (de) * 1981-01-10 1982-09-09 Laaser & Co Nachf., 1000 Berlin Stroemungsmessgeraet
JPS62165121A (ja) * 1986-01-16 1987-07-21 Cosmo Keiki:Kk 流量変換装置
DE19620699C1 (de) * 1996-05-23 1997-11-20 Hanno Dipl Ing Schmitz Strömungswächter mit Warnvorrichtung
WO2000065314A1 (fr) * 1999-04-21 2000-11-02 Eco Electronics Ltd. Dispositifs de surveillance et systemes de commande
EP2151671A3 (fr) * 2004-06-16 2010-03-03 Robert Buck Capteur pour milieux s'écoulant
DE102004028759B4 (de) * 2004-06-16 2008-06-19 Robert Buck Strömungssensor
DE102006006018A1 (de) * 2005-02-09 2006-08-10 Robert Buck Strömungssensor
WO2007071209A1 (fr) * 2005-12-21 2007-06-28 Isatech Gmbh Procede pour l'etablissement et le maintien d'une communication de donnees entre un transpondeur et une unite d'emission/reception
WO2009080633A1 (fr) * 2007-12-20 2009-07-02 Robert Buck Sonde d'écoulement pour milieux fluides
DE102008062538A1 (de) * 2007-12-20 2009-06-25 Robert Buck Anordnung und Verfahren zur Einstellung und/oder Kontrolle eines Sensorelement-Ausgangssignals innerhalb eines Funktionsbereichs eines Sensors

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
WO2009083179A1 (fr) 2008-01-02 2009-07-09 Hahn-Schickard-Gesellschaft für angewandte Forschung e.V. Dispositif fluidique pour la manipulation contrôlée de liquides et système fluidique équipé d'un dispositif fluidique

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Publication number Publication date
EP2678642A2 (fr) 2014-01-01
DE102011004743A1 (de) 2012-08-30
DE102011004743B4 (de) 2014-03-20
WO2012113882A3 (fr) 2013-01-03

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