EP1358449A1 - Dispositif pour determiner la masse d'un courant de fluide mousseux qui s'ecoule - Google Patents

Dispositif pour determiner la masse d'un courant de fluide mousseux qui s'ecoule

Info

Publication number
EP1358449A1
EP1358449A1 EP02710059A EP02710059A EP1358449A1 EP 1358449 A1 EP1358449 A1 EP 1358449A1 EP 02710059 A EP02710059 A EP 02710059A EP 02710059 A EP02710059 A EP 02710059A EP 1358449 A1 EP1358449 A1 EP 1358449A1
Authority
EP
European Patent Office
Prior art keywords
fluid flow
fluid
determined
flow
measurement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02710059A
Other languages
German (de)
English (en)
Inventor
Peter Kaever
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.)
GEA Farm Technologies GmbH
Original Assignee
WestfaliaSurge GmbH
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 WestfaliaSurge GmbH filed Critical WestfaliaSurge GmbH
Publication of EP1358449A1 publication Critical patent/EP1358449A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
    • G01N27/08—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid which is flowing continuously
    • 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
    • G01F1/704—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow using marked regions or existing inhomogeneities within the fluid stream, e.g. statistically occurring variations in a fluid parameter
    • G01F1/708—Measuring the time taken to traverse a fixed distance
    • G01F1/712—Measuring the time taken to traverse a fixed distance using auto-correlation or cross-correlation detection means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/74—Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid
    • 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
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/02—Food
    • G01N33/04—Dairy products
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/36—Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/08—Air or gas separators in combination with liquid meters; Liquid separators in combination with gas-meters

Definitions

  • the subject matter of the invention relates to a method for determining an actual profile of the superimposed phases of a flowing, foaming fluid flow and to a method and a device for determining a mass flow of a flowing, foaming fluid flow, in particular a milk flow.
  • the determination of the mass of milked milk by volume measurement is of particular importance.
  • the devices provided for this purpose have a measuring chamber in which either the mass of the content is determined by means of a tipping car or the volume is determined by means of a float or sensor electrodes.
  • devices are known by means of which the mass of milk in free flow is to be determined. These devices use ultrasonic or infrared sensors and greatly narrow the cross-section of the line and / or segment the fluid flow several times. The problem of proportional separation of a partial flow occurs with high accuracy. Previously available measuring devices based on a conductance measurement have a low accuracy. There are also devices that determine the fluid flow by binary evaluation of the sensor signal. The accuracy of the devices that work according to the second method depends heavily on external parameters such as attachment, dynamics of the fluid flow, pressure and other parameters.
  • Devices that work according to the first method have the disadvantage that, on the one hand, the fluid flow is not measured continuously and, on the other hand, that due to the more complex design, the individual components have to be carefully cleaned.
  • a ratio number is formed for each altitude level in accordance with the ratio of the reference value and the measured value at this altitude level or the reciprocal of the ratio. If necessary, a corrected ratio, which is equal to 1 for degassed liquids and substantially zero for air, can be formed in accordance with a predetermined calibration. Each ratio is multiplied by the specific gravity of the degassed liquid. The result of this multiplication provides the specific density of the foaming liquid. To determine the mass of a foaming liquid, the volumes are determined and these volumes are multiplied by the specific density of the foaming liquid.
  • the measurement values are determined, for example, by means of a measuring device which has a vessel, on the inside and at equal height intervals of which a plurality of individual electrodes which are electrically insulated from one another are arranged.
  • a counter electrode is arranged opposite the electrodes.
  • An AC voltage is applied to the counter electrode.
  • the measured value for determining the specific density of the foamed milk takes place for each electrode from a corresponding voltage drop, which is dependent on the medium located between the electrode and the counter electrode.
  • the present invention is based on the objective of specifying a method and a device which enable a determination of an actual profile of the phases stacked one above the other and a mass flow of a flowing, foaming fluid flow, in particular a milk flow, with greater certainty even at higher flow speeds.
  • information from past sampling times k-1, k-2, ... is used in the method according to the invention.
  • Calculations of derived quantities, by means of which the fluid can be characterized at the respective sampling time tk therefore do not require the sampling of the total of all height levels but can work with a subset, which in particular reflects the situation at the phase boundaries. In this case, preferably so many height levels are scanned that an assignment of each height level H 1 to a phase? * Of the fluid flow is possible.
  • a method for determining a mass flow of a flowing, foaming fluid, in particular a milk flow is proposed in which an actual profile Itk and the associated height levels H J tk of the layers ⁇ tk of the foamed layered one above the other at each sampling time tk Fluid flow can be determined.
  • the densities p J associated with the various phases P 3 , height segments h 1 , widths b 1 of the fluid flow and velocities v 1 are determined, the following being valid for the mass flow rii:
  • ⁇ is the time value of the mass flow, with the summation over all Height segments h 1 and widths b 'of the fluid stream extends.
  • the index j in the summation results from the assignment of the height levels to the phases P 1 .
  • the mass throughput and the total mass of a flowing, foaming fluid stream can be determined with relatively high accuracy.
  • the measurement is limited to the features characterizing the fluid flow, so that the measurement and evaluation effort is considerably reduced.
  • the densities (p J ) of the different phases P 1 be determined according to a reference model of a foaming fluid flow.
  • the reference model can contain information about its relationship with the density of the degassed fluid or the densities p J of other phases P *, k ⁇ j.
  • the density p of individual phases P can be derived from ratio p J of other phases P 1 by ratio values or calculations of the reference model, which in turn are given by direct or indirect measurement, parameterization on site or laboratory measurement.
  • the density p of phase P can also be given by direct or indirect measurement, on-site parameterization or laboratory measurement.
  • the density ⁇ e of the degassed fluid can be taken into account, which in turn can be done by direct or indirect
  • Measurement or parameterization on site or laboratory measurement is given.
  • the measurement on site can take place at a different location than that for determining the Phase boundaries take place.
  • a reference profile R is at least the lying at different height levels H J phases PR J creates a foamed reference fluid, wherein the reference profile R p is the specific density J or to the specific gravity p J proportional parameter K J for the individual phases PR J and / or contains phase transitions PGR J , and the actual profile Itk is compared with the reference profile R to determine the specific density p J t k of the associated volumes V J t k and the phase transitions PG J tk.
  • the reference profile is preferably determined in the laboratory, so that precise data relating to the phase transitions and the specific density of the individual phases can be determined. By comparing the actual profile with the reference profile, it is possible in a simplified manner to determine the essential quantities which are necessary for determining the mass of a flowing, foaming fluid flow.
  • the speeds v 1 of the different phases P 1 are determined by measurement and / or from a reference model of the foaming fluid flow.
  • the speeds v 1 are preferably determined here from the thicknesses ° of the phases P 1 .
  • the reference model contains ratio values or calculation rules for the speeds v 3 of one or more phases P 1 with one another.
  • the speed of individual or all phases can be determined by direct or indirect measurement.
  • the speed v 1 can from the thicknesses ⁇ 0 of the phases P 1 after
  • Flow law can be determined.
  • the thickness of the phase layer is scanned at at least two points spaced apart from one another and the signals associated with the points are correlated with one another.
  • the correlation results in Time offset ⁇ t * of the signals of the at least two digits. From the known path difference ⁇ s 1 between the measuring points, the speed v 1 can be determined in accordance with the phase V 3
  • a method is preferred, in which an actual profile Ik and the associated height level H J tk of the layers P'tk of the foamed fluid flow which are layered one above the other are first determined at a time tk, the phase boundaries being sought. From the data of the actual profile
  • Phase transitions PGtk-i Phase transitions PGtk-i. A check is now carried out to determine whether a change in the height level H J tk of the phase transitions PG J tk compared to the corresponding ones
  • Phase transitions PG'tk of the last measurement lies within a tolerance field, it is assumed that the profile of the phases stacked on top of one another is unchanged compared to the previous measurement.
  • the determination of the actual profile and / or the checking of a possible change in the height levels of the phase transitions be carried out on the basis of a contact resistance measurement.
  • the contact resistance measurement provides time-resolved contact resistance signals in the free fluid flow.
  • free means that the measurement is carried out in the fluid flow without backflow of the fluid. Neither chambers nor other flow-inhibiting devices are therefore necessary; in other words, the measurement method is a real fluid flow measurement which has a low flow resistance and does not require a detour via a pressure measurement.
  • the contact resistance measurement is advantageously carried out between at least two electrodes, in particular electrical conductors, which are spaced apart in parallel and partially stand in the free fluid flow.
  • the contact resistance signal can be a one-dimensional quantity, as is the case with two conductors. However, it can also be a multidimensional quantity if several conductors are used and the contact resistances between the individual conductors are determined.
  • the result of this advantageous embodiment of the method is that, in particular, high measuring accuracy is achieved. This procedure ensures great robustness against the influence of other parameters.
  • the use of electrical conductors leads to a compact design and enables easy cleaning and adaptation to existing systems. The method according to the invention therefore enables the same to be implemented economically and has a low-maintenance mode of operation.
  • the fluid flow is guided over an edge or a slope and that Contact resistance signal between the at least two conductors spaced parallel to one another is determined at the edge or slope.
  • the flow of fluid flows around the conductors to different degrees, so that a lower resistance between the conductors is achieved for stronger fluid flows.
  • a proportional relationship between fluid flow and resistance is achieved by a suitable geometry of the conductors.
  • the measurement of the fluid flow is also possible for other geometries, but requires a suitable, possibly non-linear, conversion of the resistance signal to the actual fluid flow.
  • the fluid flow is led into a down pipe at least in one section and the contact resistance signal is determined there between at least two conductors spaced parallel to one another.
  • the measurement is preferably carried out by means of segmented electrodes.
  • the actual profile can also be determined on the basis of an optical measurement.
  • the optical measurement can take place using optical elements with locally integrated evaluation. These are preferably lens systems.
  • the measurement is preferably carried out using integrated means with optically resolving measurement.
  • the means are preferably CCD elements.
  • the conductivity of the fluid is preferably measured in a time-resolved manner. This can cause temporal fluctuations in the contact resistance signal due to
  • Fluctuations in the conductivity of the fluid as in the case of milk caused by a the time-changing composition of the milk within a milking are caused, determined and taken into account when determining the fluid flow from the contact resistance signal. Both the conductance of the fluid in the purely liquid phase and the conductance of the fluid in the liquid-gas phase are advantageously measured.
  • the contact resistance measurement and / or the conductance measurement of the fluid is carried out by means of an alternating current. This has the advantage that electrolytic deposits on the measuring electrodes, which lead to an overvoltage and thus to falsified measurement results, are avoided.
  • the conformity of the fluid flow is first produced by means of a conformity device.
  • the main task of the conformity device is to calm the fluid flow.
  • the compliance facility can also perform additional tasks. It can be used, for example, to reduce the number of layers stacked one on top of the other, so that the field of height levels and thus the measurement processes to be carried out is reduced without reducing the accuracy of determining the mass of the flowing, foaming fluid flow.
  • a device for determining the mass of a flowing, foaming fluid, in particular a milk flow which has a measuring device for determining an actual profile and the associated height levels of the layers of the foamed fluid flow which are stacked at predetermined times.
  • the device also has a storage unit in which the data significant for the actual profile are stored.
  • An evaluation unit is provided for evaluating the variables relevant to the actual profile, in particular the specific density, the associated volumes and the phase transitions. through A comparison unit checks whether there is a change in the level of the phase transitions of the current measurement compared to the corresponding level of the previously determined phase transitions.
  • the device has a control unit which is electrically connected to the comparison unit and the measuring device, the control unit actuating the measuring device at predetermined time intervals in dependence on the result of the comparison such that a measurement takes place at least in the height range of the previously determined phase transitions.
  • a special device or a correlation method is provided for determining the flow rate of the fluid flow.
  • the device according to the invention for determining the speeds in a flowing, foaming fluid flow, in particular a milk flow has the advantage that the determination of the speed is achieved with relatively simple means and with high accuracy.
  • a conforming device for the fluid flow be provided upstream of the measuring device.
  • the conforming device makes the fluid flow more uniform, so that the general conditions of the measurement are simplified and the outlay is reduced.
  • the measuring device is formed by at least one resistance measuring device which has at least two spaced electrical conductors, the resistance measuring device determining the time-resolved contact resistance between the spaced electrical conductors, which are preferably arranged in the free fluid channel so that they are both always separated from the Fluid flow can be partially flushed.
  • the conductors are spaced parallel to one another at one edge or one Slopes arranged. It is irrelevant whether they run vertically, horizontally, obliquely or laterally to the fluid stream, it is crucial that they cross the surface of the fluid stream, so that the fluctuations in the height of the fluid stream, which are the measure of the strength of the fluid stream, from Resistance signal can be detected.
  • the conductors are arranged spaced parallel to one another in a downpipe. This arrangement has the advantage that the influence of the time-changing flow velocity of the fluid, the conductivity and the influence of a time-changing viscosity is minimized.
  • the device have two measuring devices arranged one behind the other in the direction of flow of the fluid flow, which are connected to a correlation unit. By correlating the data determined from the measuring devices and knowing the distance between the measuring devices, the determination of the flow rate can be achieved by correlating the measurement results.
  • Fig. 1 schematically and in section layers one above the other
  • 3 shows a snapshot of a fluid flow in cross section
  • 4 schematically shows a diagram of the specific density as a function of the level of the fluid
  • FIG. 5 schematically shows a first embodiment of the device for measuring a fluid flow in cross section
  • FIG. 6 shows a further exemplary embodiment of a device in cross section
  • FIG. 7 shows a detail of the device according to FIG. 5 for two fluid flows of different sizes
  • Fig. 8 shows another embodiment of a device in cross section
  • Fig. 9 shows yet another embodiment of the device.
  • FIG. 1 shows schematically the structure of a reference fluid.
  • the reference fluid has a multilayer structure. It has several phases PR stacked on top of one another. There is a phase boundary PGR to PGR between the adjacent phases.
  • the phase boundary PGR is a phase boundary between a foam-like phase PR and air.
  • the phase boundaries are at different height levels H 1 to H 4 .
  • phase PR 1 is liquid
  • phases PR 2 , PR and PR 4 are foams that have different consistencies.
  • FIG 2 shows schematically a reference profile R in a diagram.
  • the height levels H 1 are normalized to the greatest possible
  • the specific density ⁇ J is related to the specific density of the liquid of the fluid normalized. Significant changes in the specific density p J define the phase boundaries PGR J.
  • FIG. 3 schematically shows a snapshot of a fluid stream, in particular a flowing, foaming milk stream.
  • the milk flow has three phases, layered one above the other, PI 1 to, PI2 to and PI 3 to. Between each
  • Phase layers are the phase boundaries PG 1 to, PG2 to and PG 3 to. This
  • Phase boundaries are at the corresponding height levels H, H and H, respectively.
  • the actual profile Ito is compared with the reference profile R to determine the specific density p J t 0 and the phase transitions PG ⁇ o. This comparison is shown in FIG. 4.
  • FIG. 5 shows in cross section a device for determining a fluid flow 5.
  • the direction of flow of the fluid is indicated by arrows.
  • the fluid is taken up by a concentrating device 2.
  • the task of the conforming device 2 is to calm the fluid flow 5, possibly also to reduce the number of phases. This is done, for example, with the help of specially shaped chambers, holes, slots, nets and / or separation devices such as U-tubes or the like.
  • the fluid flow 5 is then guided via a fluid feed line 7 from the conforming device 2 to a measuring device 6 for determining the conductivity of the fluid.
  • the measuring device 6 essentially comprises a measuring cell which contains two electrodes 1 a, 1 b, which are completely washed by the fluid flow 5 and measure the contact resistance of the fluid preferably by means of an alternating current.
  • the conductivity of the fluid can be determined with the help of the geometric dimensions of the measuring cell and the measured contact resistance signal.
  • the electrodes are preferably segmented.
  • the actual profile can also be determined on the basis of an optical measurement.
  • the Optical measurement can take place using optical elements with locally integrated evaluation. These are preferably lens systems.
  • the measurement is preferably carried out using integrated means with optically resolving measurement.
  • the means are preferably CCD elements.
  • the conductance measurement is independent of the actual strength of the fluid flow 5.
  • the measuring device 6 for determining the conductance is followed by a fluid channel 3, which has a kink 3 a, so that the fluid flow 5 flows vertically downward in an downpipe 3b after an initially horizontal course, where it then flows in a downstream and in pours into the vessel, not shown.
  • two electrodes 1a, 1b spaced parallel to one another are arranged in the bend 3a and can be, for example, wires.
  • the fluid flow 5 partially flows around the two electrodes la, lb in such a way that, depending on the strength of the fluid flow 5, a more or less larger section of the two electrodes la, lb is washed around by the fluid.
  • a stronger fluid flow 5 leads to wider contacting of the two electrodes la, lb and thus to a lower contact resistance between the two electrodes la, lb.
  • a resistance measuring device 4 measures the contact resistance between the two electrodes la, lb in a time-resolved manner, ie continuously, and gives a measure of the height of the fluid flow 5 along the axis of the two electrodes la, lb.
  • the resistance measuring device 4 is followed by a microprocessor 8, which enables the amount of fluid to be determined from a time-resolved transition resistance signal and / or a time-resolved conductance signal of the fluid.
  • the kink 3 a can, as shown here, an angle of 90 °. However, other angles, in particular less than 90 °, are also possible, such as a curve or bevel instead of a bend 3 a.
  • the fluid channel 3 is free, in particular contains no measuring chamber.
  • the electrodes la, lb can also be plate-shaped. It is advantageous if the electrodes 1a, 1b are spaced parallel to one another, since the contact resistance is then used to determine the fluid flow 5. It is also advantageous to integrate the electrodes 1a, 1b into the wall of the fluid channel 3, so that there is no additional flow resistance and the cleaning of the fluid channel 3 is simplified, and the susceptibility of the device 6 to contamination is reduced.
  • the fluid channel 3 itself can have any cross section, but a rectangular cross section is preferred.
  • At least one of the electrodes is segmented when viewed essentially perpendicular to the direction of flow.
  • a measurement is carried out, from which the actual profile Ito of the fluid flow results.
  • the layers P o of the foamed fluid flow 5 which are layered one on top of the other can be determined.
  • the specific density p J to and the phase transitions PG'to of the actual profile Ito as well as the height segments h 1 and widths b 1 of the fluid flow can be determined.
  • an actual profile Iti is determined again in the height range of the previous phase transitions PG'to.
  • the sections of the actual profile Iti thus newly determined are compared with the already known data of the actual profile Ito. If the comparison shows that the change in the phase transitions lies within a tolerance field, it is assumed that the fluid flow 5 at the time ti has the same layer structure as at the time ti. If the change lies outside a tolerance range, then the actual profile I t ⁇ is completely determined, for example only the electrode sections which give more precise information about the phase boundaries are only activated. This results in a complete actual profile at time ti, from which the data required for determining the mass are then subsequently determined.
  • the mass of the fluid flow 5 can be determined by knowing the specific densities p J tk, the flow rate and the flow duration. The following applies to the mass flow m:
  • Fig. 6 shows a further embodiment of a device in cross section.
  • the electrodes 1a, 1b are arranged in the section of the fluid channel 3 which runs vertically, that is to say in the downpipe 3b.
  • This arrangement has the advantage that fluctuations in the viscosity, such as occur in the case of a time-varying composition of the milk within a milking, do not impair the measuring accuracy of the device.
  • the vertical velocity of the fluid flow 5 is largely determined by the head and is essentially independent of the viscosity.
  • FIG. 7 shows a section of the device according to FIG. 5 for two different states: With a stronger fluid flow 5a, the surface is higher than with a weaker fluid flow 5b. It can be seen that for the stronger fluid flow 5a the electrodes 1a, 1b are wetted by the fluid over a greater height along their axis and are thus contacted.
  • Fig. 8 shows a further embodiment of a device in cross section.
  • the electrodes la, lb are segmented electrodes such as Networks of wires or fields of point contacts, between which the contact resistance is measured, so that both the fluid flow 5 a in the purely liquid phase and the fluid flow 5 b in the liquid-gas phase can be determined.
  • the milk flow 5a, 5b is spatially resolved with the aid of the segmented electrodes.
  • the present invention is particularly suitable for measuring a pulsating fluid flow 5 and works in flow with a high degree of precision and robustness. It is characterized by low purchase costs, simple retrofitting and simple cleaning.
  • the device 9 schematically shows a device for determining the mass of a flowing, foaming fluid stream, in particular a milk stream.
  • the device comprises a measuring device for determining an actual profile and the associated height levels of the layers of the foamed fluid flow which are stacked one above the other at predetermined times.
  • the measuring device 9 is connected to a storage unit 10, in which the data significant for the actual profile are stored.
  • the device is further provided with an evaluation unit 11 in which the actual profile is evaluated with regard to relevant variables, in particular with regard to the specific density, the associated volumes and the phase transitions of the actual profile.
  • a comparison unit 12 checks whether there is a change in the level of the phase transitions above the corresponding level of the previously determined phase transitions.
  • the device further comprises a control unit 13, which with the comparison unit 12 and the Measuring device 9 is electrically connected, wherein the control unit 13 controls the measuring device in predetermined time intervals depending on the result of the comparison, that a measurement takes place at least in the height range of the previously determined phase transitions. Furthermore, a device 14 for determining the flow rate of the fluid flow is often provided, which is also connected to the control unit 13.
  • phase j of the fluid I t : actual profile of the phases of the fluid at time t PG 1 : phase boundary of phase j to phase j + 1
  • h 1 Height difference between measuring point i and measuring point i + 1 b ': Width of the milk duct at the measuring point i
  • ⁇ s 1 Distance between two measuring points arranged one after the other in the fluid flow, both being in the same phase j.

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  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Measuring Volume Flow (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

L'invention concerne un procédé et un dispositif servant à mesurer un courant de fluide sur la base d'une mesure de la résistance de contact, fonctionnant dans l'écoulement, présentant un degré élevé de précision et de robustesse et caractérisés par des frais d'achat faibles, un montage ultérieur simple et un nettoyage facile. A cet effet, on procède à un échantillonnage vertical du courant de fluide, par exemple au moyen d'électrodes segmentées ou de systèmes optiques à résolution verticale, une partie seulement des segments verticaux devant être échantillonnée pour une utilisation efficace du dispositif de mesure. Les segments verticaux à échantillonner sont déduits de valeurs historiques de l'échantillonnage ainsi que d'un profil de référence qui contient, par exemple, le nombre des phases contenues dans le courant de fluide.
EP02710059A 2001-02-09 2002-02-01 Dispositif pour determiner la masse d'un courant de fluide mousseux qui s'ecoule Withdrawn EP1358449A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10105927 2001-02-09
DE10105927A DE10105927A1 (de) 2001-02-09 2001-02-09 Verfahren und Vorrichtung zur Bestimmung der Masse eines fließenden, schäumenden Fluidstroms, insbesondere eines Milchstroms
PCT/EP2002/001030 WO2002065063A1 (fr) 2001-02-09 2002-02-01 Dispositif pour determiner la masse d'un courant de fluide mousseux qui s'ecoule

Publications (1)

Publication Number Publication Date
EP1358449A1 true EP1358449A1 (fr) 2003-11-05

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Application Number Title Priority Date Filing Date
EP02710059A Withdrawn EP1358449A1 (fr) 2001-02-09 2002-02-01 Dispositif pour determiner la masse d'un courant de fluide mousseux qui s'ecoule

Country Status (4)

Country Link
US (1) US20040194553A1 (fr)
EP (1) EP1358449A1 (fr)
DE (1) DE10105927A1 (fr)
WO (1) WO2002065063A1 (fr)

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DE10349577A1 (de) * 2003-10-24 2005-06-02 Westfaliasurge Gmbh Verfahren und Vorrichtung zum Melken eines Tieres bei Selbstjustierung zumindest eines Messfühlers zur Überwachung zumindest einer Kenngröße der Milch
NL2008577C2 (nl) 2012-03-30 2013-10-01 Fusion Electronics B V Inrichting voor het bepalen van een massadebiet van een fluã¯dum in een kanaal.

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US20040194553A1 (en) 2004-10-07
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