EP0441849A1 - Procede et dispositif pour prelever des echantillons de liquide sur une conduite - Google Patents

Procede et dispositif pour prelever des echantillons de liquide sur une conduite

Info

Publication number
EP0441849A1
EP0441849A1 EP19890912434 EP89912434A EP0441849A1 EP 0441849 A1 EP0441849 A1 EP 0441849A1 EP 19890912434 EP19890912434 EP 19890912434 EP 89912434 A EP89912434 A EP 89912434A EP 0441849 A1 EP0441849 A1 EP 0441849A1
Authority
EP
European Patent Office
Prior art keywords
flow
pressure
volume
line
liquid
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Withdrawn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
EP19890912434
Other languages
German (de)
English (en)
Inventor
Manfred Pust
Hans Otto Mieth
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.)
SCHWARTE-WERK GmbH
Original Assignee
SCHWARTE-WERK 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
Priority claimed from DE19883837598 external-priority patent/DE3837598A1/de
Application filed by SCHWARTE-WERK GmbH filed Critical SCHWARTE-WERK GmbH
Publication of EP0441849A1 publication Critical patent/EP0441849A1/fr
Withdrawn legal-status Critical Current

Links

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
    • G01F1/34—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 measuring pressure or differential pressure
    • G01F1/36—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 measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/40—Details of construction of the flow constriction devices
    • G01F1/46—Pitot tubes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F5/00—Measuring a proportion of the volume flow
    • G01F5/005—Measuring a proportion of the volume flow by measuring pressure or differential pressure, created by the use of flow constriction
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/10—Devices for withdrawing samples in the liquid or fluent state
    • G01N1/20—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials
    • G01N1/2035—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials by deviating part of a fluid stream, e.g. by drawing-off or tapping

Definitions

  • the invention relates to a method and a device for obtaining liquid samples from a flow line according to the preamble of independent claim 1.
  • Sampling methods of the type identified in the introduction are used in particular where, on the one hand, the characteristic values of the liquid to be transferred and to be sampled are present during the transfer change or where they fluctuate significantly and where on the other hand the flow rate in the transfer line changes.
  • a sample or a sample obtained at intervals from the flow line can never be representative, i.e. represent a sample containing the true characteristic values of the volume of liquid to be sampled.
  • Transport vehicle that drives to the individual suppliers and is supposed to collect a representative sample there during the transfer of the available milk.
  • concentration of the ingredients in the milk provided may change very much when viewed over the height of the container (eg creaming).
  • a method of the genre identified in the introduction which is used to obtain milk samples, is known from DE-PS 12 24 522. It is characterized in that the milk to be transferred to a sampling vessel from the flow line in a manner known per se in an amount dependent on the dynamic pressure while keeping the static pressure conditions constant at the sampling point and in the sampling vessel at various points in the flow cross section and before dividing into Sample amount and remaining amount is mixed.
  • FIG. 10 shows a device for carrying out the known method
  • Pressure loss coefficient ⁇ L is given.
  • the outlet cross section A D at point II has a pressure loss coefficient ⁇ D , the inlet line 5 to the sampling vessel 3 has one
  • the Bernoulli equation for steady flow between positions I and II on the one hand and II and III on the other hand supplies with the above-mentioned quantities and with the above-mentioned pressure condition (pressure compensation line 6 according to DE-PS 12 24
  • Q means the density of the liquid and g the acceleration due to gravity.
  • Proportionality between cpr and c I is only given if the second and third term of equation (1) become zero.
  • the second term can be made zero by equal geodetic heights between I and III.
  • the pressure loss ⁇ p p to overcome the paraboloid of revolution is in a first approximation independent of the flow in the flow line 4 and only dependent on the intensity of the rotation in the air separator. In this way, ⁇ p p can be retained for a short time, even though the speed c I decreases sharply (for example, the flow line is blocked or throttled).
  • the atmospheric pressure at the interface between air and liquid reaches the tapping point I.
  • the pressure from the atmospheric pressure decreases in accordance with the pressure gradient as a result of pressure loss, without any penetration of the atmospheric pressure or changing pressure curve through the "liquid plug" into the air separator, and thus raising the pressure there to the raised pressure level in the flow line 4 is possible. Therefore, the static pressure at the tapping point I, which continuously rises to atmospheric pressure, cannot exceed the known pressure compensation line 6 are transmitted to the head space of the sampling vessel 3.
  • the inventive method produces the partial flow in strict dependence on the dynamic pressure of the flow in the flow line, inter alia, in that the pressure equalization between the static pressure in
  • Position III in the head space of the sample flow vessel assumes a small value that is negligible compared to the dynamic pressure.
  • the third term of equation (1) plays no role in the solution proposed according to the invention, since the pressure compensation point always before and never behind the
  • Rotation paraboloid of the air separator is arranged.
  • the main advantages of the proposed method lie in the realization of the partial flow withdrawal dependent on the dynamic pressure, even during the transient run-out state of the transfer.
  • This is further achieved according to the invention in that the difference between the static pressures at the tapping point and in the branched volume is mapped into a manipulated variable which can be used for pressure equalization. If this manipulated variable is the change in the mirror difference of a liquid surface, this liquid surface can compress or decompress a gas volume provided according to the invention in such a way that the desired pressure equalization between the static pressure at the
  • Tapping point and the static pressure in the branched volume is thereby produced.
  • the change in the level difference of the liquid surface is represented by a float, which controls a pressure source acting on the branched-off volume.
  • the method for carrying out the method according to the invention provides for controlling a pressure source acting on the branched volume via the deflection of a membrane which is acted upon on the one hand by the static pressure of the liquid at the sampling parts and on the other hand by the static pressure in the branched volume.
  • Sample flow vessel as advantageous if the static pressure at the sampling point is replaced by a static pressure of the same value at a geodetically lower point downstream.
  • the residual volume which remains as a sample of the branched-off volume after branching off a partial volume, can then be easily discharged into the flow line via this lower point.
  • the dimensioning criterion for the geodetic height difference must be that the pressure loss in the flow line between the tapping point and the lower point is just compensated by the pressure gain due to the geodetic height difference at the nominal flow rate.
  • the pressure adjustment over a gas volume arranged between the liquid surface and the branched-off volume can be supported in a particularly effective manner in that the flow impulse inherent in the liquid as it flows into the gas volume is used to briefly equalize the pressure between the pressure in the gas volume and the Atmosphere or other pressure source.
  • the liquid displacing the gas volume creates a pressure balance between the pressure in the gas volume and the atmosphere or the other pressure source by means of a buoyancy effect on a body immersed in it. In this case, the static pressure rising to the atmospheric pressure at the extraction point is almost immediately compensated for.
  • Division ratios realized by throttling a passage cross section The smallest division ratios resulted in very small opening cross sections, which are susceptible to clogging and cannot always determine the true characteristic value of the transferred liquid under unfavorable sampling conditions.
  • the invention provides that that for the branched Volume-specific partial cross-section is not only reduced by changing the position of the flow divider, but that it also shifts into a flow area in which there is an increasingly less effective flow.
  • the passage cross section consequently consists of many partial cross sections which are flowed through without equal rights and which can optionally be set via the flow divider, without the partial flow passing through the total cross section being throttled.
  • the other proposed method according to the invention reduces the branched volume flow in that the
  • the invention is based on a device in which a sample flow vessel, which is connected to the flow line via an inlet line which is provided with an inlet opening designed as a pitot tube, and which has a pressure compensation line which opens out in the head space of the sample flow vessel .
  • the pressure compensation line is connected to the flow line in the vicinity of the tapping point.
  • Equation 1 is thus reduced to the following proportionality relationship between the main flow in the flow line and the partial flow to the sample flow vessel:
  • an embodiment of the device provides that the pressure compensation line opens into the head space of a container , And that a dip tube is provided which is ruled out in the vicinity of the tapping point on the flow line and extends down into the lower region of the container.
  • a dip tube is provided which is ruled out in the vicinity of the tapping point on the flow line and extends down into the lower region of the container.
  • the change in the mirror difference in the aforementioned container can, as is provided by another embodiment of the device according to the invention, be detected by a float which branches onto the one Volume acting pressure source controls.
  • the pressure difference causes a membrane to deflect, which then controls a pressure source acting on the branched-off volume in the same way.
  • the pressure equalization between the static pressure at the sampling point and the static pressure in the head space of the sample is carried out without delay if, as is provided by a further embodiment of the device according to the invention, the pressure equalization line on the side for the flow line into the headspace of a container
  • Containers are arranged in a common container shell and their mutual separation only via one
  • the head space of the container is connected to the atmosphere via a valve.
  • This valve can either be controlled by the liquid communicating with the tapping point or can be controlled by the flow impulse that is inherent in the compensation case.
  • one embodiment of the device provides that a slot is arranged in the wall of a hollow cylinder, which slot extends over the circumference and in the longitudinal axis of the cylinder, and that a current divider is provided within the cylinder, which divides the entire passage cross section of the slot in an arbitrarily adjustable ratio.
  • the flow divider has no reducing effect with regard to the passage cross section of the slot; it only divides the passage cross-section differently, whereby according to a further embodiment it is provided that the for the branched volume flow into the
  • sample flow vessel cross-section of the slot extends into a flow area, which causes an increasingly less effective flow. While the slit cross-section is flowed vertically at the foremost inflow point of the cylinder, the inflow on the side of the cylinder occurs practically parallel to the passage cross-section, so that there is no longer any effective flow.
  • another embodiment of the device according to the invention provides for a sampler arranged at the extraction point to be designed as a Prandtlian pitot tube, which is rotatably mounted about an axis oriented perpendicular to the direction of flow in the flow line.
  • a sampler arranged at the extraction point to be designed as a Prandtlian pitot tube, which is rotatably mounted about an axis oriented perpendicular to the direction of flow in the flow line.
  • the sampler is designed as a rotatably mounted cylinder which reaches across and in the middle through the through-flow line provides a relatively simple arrangement. With this arrangement, it is possible to change the partial flow draw by rotating the cylinder via at least one dust bore opening out perpendicular to the cylinder surface such that all intermediate states are possible with very high reproducibility between a maximum value and zero delivery.
  • the dust bore is arranged at a point at a distance from the wall of the flow line at which there is an average speed for the flow line.
  • FIG. 2 shows a device according to Figure 1b, the
  • Figure 3 shows a further embodiment of the device according to
  • 5a to 5d are schematic representations through further configurations of the device according to FIG. 1c, with a container for intensifying the pressure compensation;
  • FIG. 6a to 6c are schematic representations of a sampler;
  • FIG. 7 shows a central section in a schematic representation through another sampler in the area of the sampling point and
  • FIG. 1a shows basic solutions of the device according to the invention.
  • a flow line 4 (FIG. 1a) is flowed through by a liquid flow at the speed c I.
  • An extraction point I there is the inlet opening of an inlet line 5 which leads into the head space of a sample flow vessel 3. It is designed as a pitot tube at the extraction point I.
  • a pressure compensation line 6 is connected on the one hand in the vicinity of the tapping point I to the flow line 4 and on the other hand to the head space of the sample feed vessel 3. she flows into the flow line perpendicular to the direction of flow, so that the static pressure acts on the sampling part I at the connection point II.
  • the static pressure in the sample flow vessel 3 is adjusted to the static pressure at the tapping point I. Since the total pressure of the flow, which I compose from the static pressure and the pressure, prevails at the extraction point I, the inlet line 5 is subject to a total pressure difference which corresponds to the dynamic pressure of the flow in the flow line 4 corresponds.
  • the dynamic pressure is thus the driving pressure difference for the liquid volume 3 a branched off via the feed line 5 into the sample feed vessel at the speed c Pr .
  • the arrangement shown results in a partial flow withdrawal into the sample flow vessel 3, which is strictly proportional to the volume flow in the flow line 4.
  • FIG. 1b shows an arrangement in which the connection point II of the pressure compensation line 6 to the flow line 4 is at a distance downstream from the removal point I.
  • the error that this arrangement brings with regard to the pressure equalization between the tapping point I and the head space of the sample feed vessel 3 is the slight pressure loss between the points I and II.
  • this arrangement has the advantage that the flow processes and the flow fields the positions I and II do not influence each other, and that this basic solution can be used to derive configurations which solve the task in an outstanding manner.
  • FIG. 1c shows a further arrangement of the device in which the pressure compensation line 6 is connected to a downward line part 4 of the flow line 4 connected.
  • the geodetic height difference is chosen so that it corresponds to the pressure drop at the nominal delivery rate I-II corresponds to the flow line 4 between the tapping point I and the connection point II.
  • the pressure compensation line 6 extends from the connection point II upwards into a dome 3b above the head space of the sample flow container 3.
  • the latter arrangement also means that the pressure compensation line 6 has the function of a fill level limitation for the sample flow container 3.
  • the device according to FIG. 2 represents a further development of the device according to FIG. 1b.
  • a container 17 is additionally provided, in the head space of which the pressure compensation line 6 opens.
  • An immersion tube 17b is connected to the flow line 4 in the vicinity of the extraction point 1 and extends down into the lower region of the container 17.
  • a part of the head space of the sample flow vessel 3 extends into the flow line 4 and is therefore part of the sampler with the inlet line 5.
  • a pressure difference between the sampling point I and the branched volume 3a causes an inflow or an outflow of liquid into or out of the container 17.
  • the resulting change in the mirror difference .DELTA.z leads to compression or decompression of the gas volume which is located above the liquid in the sample flow vessel 3 and in the container 17.
  • the branched volume flow must emerge via the inlet line 5 against a static pressure which is determined by the height H of the liquid in the dip tube 17b.
  • the pressure resulting from the height H slightly falsifies the back pressure-dependent sampling.
  • the height H can be dimensioned so small that it can be neglected in relation to the pressure level.
  • Liquid transfer in the flow line 4 is the liquid mirror in the container 17 on the lower edge of the dip tube 17b.
  • the container 17 can be significantly smaller than the container 17 in the device according to FIG. 2, since it only has to have enough liquid deposits 17c that a float 26, which the ventilation valve 27, consisting of a closing member 27a, a valve seat 27b and one on one Valve rod arranged stop 27c, experiences sufficient buoyancy in all operating cases.
  • the closing member 27a and the valve seat 27b are designed so that they operate under the float stroke as a control valve with a desired control characteristic. So that slight pressure fluctuations are not directly reflected in an engagement of the ventilation valve, the float 26 in its normal operating position has a certain play relative to the rod of the ventilation valve 27, which is determined by the stop 27c.
  • FIG. 4 shows a device according to the invention, which represents a further development of the device according to FIG. 1b.
  • a pressure measuring device 12 with a membrane 12a and a device 12b which detects its deflection and which controls a pressure source 14 connected to the head space of the sample flow vessel 3 is arranged in the region of the removal point I.
  • the membrane 12a is on the one hand Static pressure of the liquid at the tapping point I and, on the other hand, the static pressure above the branched-off volume in the sample flow vessel 3 through a second pressure compensation line 24.
  • the pressure adjustment can be forced via the pressure source 14.
  • the deflection of the membrane 12a is transmitted via a signal line 15a to a control unit 13 which controls the pressure source 14 via a second signal line 15b.
  • a pressure curve p (1) is shown in FIG. 4 on the left-hand side of the tapping point I as it spreads, for example when the hose is emptied or the flow line is emptied, from the inlet into the hose or the flow line and in the direction of the tapping point I at the speed c I .
  • To the left of the liquid interface is the atmospheric pressure p 0 , while to the right there is a pressure gradient dp / dl, which results from the pressure loss of the volume flow flowing in the flow line 4. It can be seen that the pressure at the extraction point I increases from a relatively low pressure in the stationary state of the transfer to atmospheric pressure p 0 .
  • the essential parts of the device according to FIG. 4a correspond to those according to FIG. 4, the sample supply vessel 3 being designed and arranged according to the basic solution according to FIG. 1c.
  • the device according to FIG. 4 takes the place of the immersion tube 17b in the device according to FIG. 4
  • FIG. 5a shows a further embodiment of the device according to Figure 1c.
  • the pressure equalization line 6 is not, as in the device according to FIG. 1c, directly connected to the flow line 4 * via the connection parts II, but a container 17 is interposed, in the latter
  • FIG. 5b shows a modified embodiment of the device according to FIG. 5a, in which the sample supply vessel 3 and the container 17 are arranged in a common container jacket 3d and their mutual separation takes place via a partition 3c.
  • the container 17 additionally has a float-controlled valve 18, the float 18a of which is raised when the liquid flowing into the container 17 rises, so that it lifts a closing member 18c from its seat surface via a rod 18b, as a result of which a penetration of the atmospheric pressure p O is given in the container 17 and thus via the pressure compensation line 6 in the head space of the sample flow vessel 3.
  • the float-controlled valve 18 remains open.
  • the device according to FIG. 5d has a valve 19 which is controlled by the flow impulse of the liquid entering the container 17 and which consists of a baffle plate 19a, a rod 19b and a closing member 19c, and this automatically after the flow impulse has subsided sinks back into its closed position.
  • the valve 19 remains in its open position, the head space of the container 17 and thus also the Head space of the sample flow container 3 is connected to the atmosphere.
  • the static pressure at the tapping point I is lower than the static pressure in the sample flow vessel 3, since here the ventilation measure gives rise to atmospheric pressure p O for a short time. But since the points I and II communicate with each other, and the static pressure difference between them is relatively small, an outflow of liquid from the container 17 through the connection point II into the flow line 4, so that with a closed valve 19 one Pressure reduction and a balance of pressures
  • 6a to 6c show a sampler 20 with the possible positions of a flow divider 25.
  • a slot 22b is provided which breaks through its wall, starting from the foremost inflow point of the cylinder 22 extends on one side over the circumference and in the longitudinal axis of the cylinder.
  • the current divider 25 (see FIG. 6) divides the passage of the cross section
  • FIG. 6a shows the sampler 20 described above in a side view.
  • the current divider 25 is arranged in two further discrete positions (25; 25 *) within the sampler 20. In the upper position he has the
  • the sample flow Q Pr corresponds to the undiminished volume flow Q which passes through the slot 22b as a whole.
  • a second purge flow Q S2 flows via the inflow opening 22d and the outflow opening 22c.
  • the connection between the slot 22b and the feed line 5 to the sample flow vessel 3 is completely closed.
  • the volume flow Q entering the hollow cylinder through the slot 22b also flows out through the outflow opening 22c into the flow line 4.
  • the current divider 25 is in its uppermost switching position, in which the sampler 20 can be cleaned in an advantageous and very effective manner.
  • a main cleaning stream Q R passes through the inflow opening
  • the first cleaning sub-stream Q R1 flows via the inlet line 5 into the sample flow vessel 3, the second cleaning sub-stream Q R2 flows through the outflow opening 22c into the
  • a third partial cleaning stream Q R3 enters the feed line 5 via the slot 22b
  • Sampler 20 can thus be completely cleaned with all of its surfaces that come into contact with milk.
  • FIG. 7 shows an advantageous embodiment of a
  • the pit hole has the function of a pitot tube on, whereby the total pressure of the flow can be measured as the sum of static pressure and dynamic pressure, while the pressure bore acts as a pressure probe and only measures the static pressure of the flow.
  • the dust bore 20a is connected to the inlet line 5 and the pressure bore 20b to the pressure compensation line 6.
  • the sampler 20 is rotatably mounted about an axis oriented perpendicular to the flow direction in the flow line 4.
  • FIG. 8 shows a modified embodiment of the sampler 20 according to FIG. 7, the bluff body itself having the shape of a cylinder 22.
  • the cylinder 22 extends transversely and centrally through the flow line 4 and has at least one dust hole 22a, which opens out perpendicular to the cylinder surface.
  • the dust hole 22a is in turn connected to the inlet line 5, while the
  • Pressure equalization line 6 is connected at another, downstream location to the flow line 4 or 4 * .
  • the cylinder 22 is located concentrically within a housing 21, a passage cross section which is expediently the same or slightly smaller than that is formed between the cylinder jacket surface and the housing
  • FIG. 8b shows a cylindrical bluff body 22 in which the feed line 5 connected to it branches into more than one boring hole.
  • the cylinder 22 has three dust bores 23a, 23b and 23c.
  • Figures 9, 9a and 9b show the possibilities with regard to the basic arrangement of the device according to the invention at any point in the flow line 4 of a liquid reception and measuring system, e.g. for milk. Since the partial flow is drawn from the flow line 4 solely as a function of the prevailing pressure, it is independent of the static pressure level present in each case.
  • the device is located between a first pump 8 and an air separator 2.
  • the pump 8 conveys the liquid from a first container 1 into the air separator 2 via a hose 4a.
  • the device according to the invention is located on the suction side of the first pump 8.
  • FIG. 9b shows a further arrangement in which the flow line 4 is connected to an air separator 2, the head space of which is connected to a vacuum source 10.
  • the liquid is demanded from the air separator 2 via a second pump 9 arranged in the downstream flow line 4b
  • FIGS. 9a and 9b show the advantages of the new method and the device for carrying it out. In these arrangements, namely the static pressure at the point of removal when vacuuming the
  • Hose 4a rise from a relatively low pressure during the stationary transfer phase to atmospheric pressure in the unsteady phase-out phase.
  • the falsification of the partial flow draw given by prior art devices due to this pressure change is how

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

Procédé et dispositif pour prélever des échantillons de liquide sur une conduite de passage menant d'un premier récipient à un second récipient. Lors du passage d'un volume de liquide à examiner, on dévie de la conduite de passage un volume représentatif du volume total du liquide transféré, on le rassemble et, à la fin du transfert, on prélève un volume partiel sur le volume total en tant qu'échantillon. Ce procédé et le dispositif qui sert à le mettre en oeuvre permettent notamment d'effectuer un prélèvement partiel de courant en n'importe quel endroit de la conduite de passage et de dévier un volume représentatif du volume de liquide à examiner pendant toutes les phases du transfert de ce liquide. A cet effet, le volume dévié est prélevé en continu de la conduite de passage selon un procédé connu en soi, la quantité dépendant de la pression de retenue; on adapte immédiatement la pression statique dans le volume dévié à la pression statique sur et par-dessus le liquide à proximité du point de prélèvement et on obtient une variable réglante servant à compenser la pression à partir de la différence entre les pressions statiques, cela sans que la pression soit compensée pour l'entrée et la sortie du liquide du volume dévié. Dans un dispositif de mise en oeuvre dudit procédé, on a notamment prévu une conduite de compensation de pression (6), qui débouche dans la tête d'un récipient (17), et un tube plongeur (17b), qui est relié à la conduite de passage (4) à proximité du point de prélèvement (I) et qui se prolonge jusque dans la partie inférieure du récipient (17).
EP19890912434 1988-11-05 1989-10-28 Procede et dispositif pour prelever des echantillons de liquide sur une conduite Withdrawn EP0441849A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3837598 1988-11-05
DE19883837598 DE3837598A1 (de) 1988-07-01 1988-11-05 Verfahren und vorrichtung zur gewinnung von milchproben aus einer durchflussleitung

Publications (1)

Publication Number Publication Date
EP0441849A1 true EP0441849A1 (fr) 1991-08-21

Family

ID=6366563

Family Applications (2)

Application Number Title Priority Date Filing Date
EP89110387A Withdrawn EP0367899A1 (fr) 1988-11-05 1989-06-08 Méthode et appareil d'extraction d'échantillons liquides d'une tuyère de passage de liquide
EP19890912434 Withdrawn EP0441849A1 (fr) 1988-11-05 1989-10-28 Procede et dispositif pour prelever des echantillons de liquide sur une conduite

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP89110387A Withdrawn EP0367899A1 (fr) 1988-11-05 1989-06-08 Méthode et appareil d'extraction d'échantillons liquides d'une tuyère de passage de liquide

Country Status (2)

Country Link
EP (2) EP0367899A1 (fr)
WO (1) WO1990005291A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2765337B1 (fr) * 1997-06-25 1999-08-06 Inst Francais Du Petrole Dispositif de prelevement et/ou d'injection pour fluides susceptibles d'evoluer selon une reaction reversible
FR2765338B1 (fr) * 1997-06-25 1999-07-23 Inst Francais Du Petrole Dispositif de prelevement et/ou d'injection d'un echantillon de fluide permettant de conserver l'equilibre chimique et/ou thermodynamique
DE102016007094B3 (de) * 2016-06-10 2016-12-22 Qfood Gmbh Probenentnahmevorrichtung zur Entnahme von Getränkeproben aus einer Getränkeleitung, die ein unter Druck stehendes gashaltiges Getränk enthält

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1251042B (de) * 1962-05-19 1967-09-28 Ahrens &> Bode, Schonmgen bei Braunschweig Vorrichtung zur Probeentnahme von Milch aus einer zu einem Sammelbehalter fuhrenden Durchflußleitung
US4082004A (en) * 1977-04-14 1978-04-04 Gustafson, Inc. Crosscut sampler
GB2162647B (en) * 1984-08-02 1988-04-13 British Nuclear Fuels Plc Apparatus for measuring total flow in pipes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9005291A1 *

Also Published As

Publication number Publication date
WO1990005291A1 (fr) 1990-05-17
EP0367899A1 (fr) 1990-05-16

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