DE102005005295A1 - Fill level detector for fluid flowing in measuring chamber, has wall of measuring chamber made of electrically insulating material in region of electrodes - Google Patents

Abstract

At least one inlet and outlet is provided in the wall of the measuring chamber. At least two flat electrodes (31,32) are arranged opposite each other at the wall of the measuring chamber. The wall of the measuring chamber is electrically insulating in regions encompassing the two electrodes.

Description

The The invention relates to a method for promoting a gas content having liquid from a first deployment location to a second deployment location and to the flow rate measurement. The invention further relates to a device for quantity detection when accepting and / or dispensing a liquid.

at the receipt and delivery of liquids, especially from a stationary Tank in a mobile tank or vice versa, is in the custody account Goods traffic usually a volume measurement required. The volume of the flowing product can, for example, from a measurement of the flow and its integration over the time to be determined. The problem with this measurement can but be that flowing Product, for example, milk, wine or fuel oil, especially at the beginning and / or at the end of the acceptance or delivery, but also when changing from one Tank to another tank, more or less strong with air or possibly also be loaded with another gas. These Gas loading can lead to a measurement error if the gas is in the flow measurement as a liquid is measured.

The Problem of gas loading can in particular in measurements on milk collection cars and / or on heating oil vehicles occur.

Around It is this to reduce incorrect measurements due to the gas loading known to use so-called gas separator or Gasmessverhüter. Such devices are known, for example, from the article "Gas Abscheidende Einrichtungen" by H.-H. Oelze, released in the report of the Physikalisch-Technische Bundesanstalt "Volume and mass measurements of liquids ", M. Zander (ed.), ISBN 3-88314-741-9, Dec. 1987, known.

Gas measuring instruments and Gas separators are usually complex mechanical structures. you are often comparatively heavy, whereby the maximum Zuladegewicht a mobile tanks can be reduced. In addition, both their acquisition costs as well as their operating costs comparatively high, in particular As a rule, a relatively high cleaning effort is required. In addition, you can they also accept and / or limit the delivery rate because the degassing of the product basically not in any short Time performed can be.

From the DE 197 10 296 C1 It is known to divide the delivery flow into a main and a secondary flow, and to free the side stream by means of a separator of air admixtures. By ultrasonic transit time measurements in both the main and in the secondary flow is closed on the gas content in the main stream. The procedure of DE 197 10 296 C1 However, due to its flow guidance and the required dual measurement is comparatively expensive. In addition, a complex and heavy gas separator is still required for the secondary flow.

Out WO98 / 11429 discloses a method and a device, with which the acceptance performance of a measuring system for milk when using the known Luftabscheidesysteme to be optimized. This document teaches, for example, by running time measurement, the air loading of milk flow to determine and the acceptance power depending on the determined Control air loading. It is assumed that a significant Air loading usually only at the beginning and end of the milk takeover occurs while in the intermediate main flow no significant air charge is present and thus no reduction in acceptance power required is. For small delivery quantities, at the beginning and end of the Milk intake already follow each other directly, is the aforementioned However, the method is only conditionally suitable, as this is almost continuous must be worked with reduced acceptance power. As it is beyond that even during the Main flow can come to gas loading, for example, in leaking Connecting elements, in particular hose couplings, can in the prior art method even with large quantities unwanted time losses result.

From the DE 198 39 112 A1 , of the DE 100 17 379 A1 as well as the DE 100 46 921 C1 Dipstick measuring methods are known with which the problem of incorrect measurements during gas loading can be circumvented. Since, however, each tank to be filled or emptied usually has to have at least one own Peilstabmesseinrichtung, and since usually each tank must be measured in terms of its volume by a legal calibration, the previously known Peilstabmessverfahren can be relatively complex.

The object of the invention is to specify a method for conveying and delivery quantity detection of a liquid having a gas content from a first supply location to a second delivery location and a device for quantity detection in the acceptance and / or delivery of a liquid, the high accuracy of a particularly simple, fast and economic allow liquid transfer.

The The object is achieved by a Method with the features of claim 1 and a device solved with the features of claim 12. Preferred embodiments are in each dependent claims specified.

One The first aspect of the invention resides in a method for conveying and to the flow rate measurement a gas containing liquid, in particular milk or fuel, from a first location to a second location Provision location, where the liquid with the gas content the first place of delivery is passed in a line, the liquid is passed through the line with the gas, in the line a degree of filling carried out If a flow measurement is carried out in the pipeline, the liquid together with the gas content contained therein from the line in the second Passing the deployment site and the results of the flow measurement with those of the degree of filling measurement to determine the flow rate will be charged.

One The basic idea of the invention can be seen in the fact that gas bubbles, which are in the to be promoted and medium to be measured, not separated or excreted but measured by measurement and in the flow rate determination to be included. For this purpose, a degree of filling measurement is provided with which the gas content, in particular the gas bubble content, which in the line located liquid can be determined.

Accordingly, advantageously eliminated a gas separation during the transfer of liquid between the two locations. Correspondingly, too a hitherto common Air separator or gas measuring device omitted. This requires a reduction in costs, in particular due to a reduced maintenance effort, as well as a reduction the weight of carrying out the Method used device. Especially with mobile devices This weight reduction can lead to an increase in the weight of the load. Besides results in the inventive method, compared to previously known methods with gas separators, a reduction of flow resistance in the line, from which an increase the suction / pumping power or a reduction of the pumping effort follows. Furthermore, the invention allows a simplification of the piping effort and a particularly simple cleaning of the device, in particular with a cleaning-in-place procedure (CIP method). Also, the for the method used device according to the invention particularly be made tamper-proof. Finally, the method according to the invention allows also a comparatively high measuring accuracy. In attempts could a relative error, i. a calibration accuracy of about 0.3% or better in the determination of the flow rate be achieved. The method according to the invention and the device according to the invention are basically for any Delivery quantities, but also suitable for large quantities.

Under the degree of filling For example, the fluid content and / or the liquid level in the line, but also the gas content, in particular the content of undissolved Gas, understood in the liquid become. For filling degree measurement can on the line a Füllgradmesseinrichtung be provided, which in particular formed as a bubble detector can be. The degree of filling measuring device can preferably as a conductivity sensor, designed as a capacitive sensor and / or as an optical sensor be. Under the filling degree measurement accordingly, in particular a conductivity measurement, a Capacitive measurement and / or optical measurement of the degree of filling be understood. A conductivity measurement is especially for conductive liquids, such as Milk, suitable while a capacitive or optical measurement, especially in non-conductive Liquids, such as fuel oil, is preferred.

at The flow measurement can in particular a volume flow and / or a mass flow through the line are detected. For flow measurement a flow meter is suitably used. These Flow measuring device can, for example, as a volume counter, in particular as a volumetric counter, i.e. as a direct measuring volume meter, and / or as a flow meter, i. as an indirectly measuring volume counter, be educated. In particular, you can a displacement counter, a Discontinued counter a measuring wing, a throttle device and / or a Coriolis counter be provided. A particularly reliable and accurate flow measurement can be obtained with a magnetic inductive counter.

There Flow measurements, in particular with the Coriolis measuring method, in usually affected by the influence of gas loadings, is a Füllgradmessung according to the invention provided by means of these impairments in the determination the flow rate can be compensated. According to the invention can degree of filling and / or the flow measurement in principle for the determination of any with the degree of filling or the flow correlated parameters, ie also to the indirect Serve measurement.

It is particularly preferred that the degree of filling measuring device for Füllgradmessung and / or the flow measuring device for flow measurement as in EP 0 617 789 B1 , of the EP 0 626 567 A1 and / or as described in the German utility model application with the file reference 20 2004 019 442.2. Thus, the degree of filling measuring device may in particular be formed with a measuring chamber surrounding a measuring chamber in which at least one opening for introducing and / or discharging the liquid is provided, and at least two flat electrodes, which are arranged opposite each other in the region of the measuring chamber in the measuring chamber, wherein the measuring chamber wall in isolation areas, which connect to the two electrodes and surround them flat, is designed to be electrically insulating.

The inventive method In particular, in the case of the acceptance and / or delivery of liquid substances, preferably from stationary Tanks in mobile tanks and / or vice versa, for example in the custody account Goods traffic, find use. In principle, the invention is for any Liquids, preferred for Milk, dairy products, wine or fuel, especially fuel oil suitable. Especially At least one of the points of delivery on a collection truck, in particular on a milk truck or on a fuel oil vehicle, be provided. Preferably, the inventive method in the quantity detection in the liquid intake, in particular Milk intake, with a mobile or stationary acceptance system for use.

To the Calculation of the measurement results and to determine the flow rate an evaluation device is suitably provided, with which the degree of filling measuring device and the flow meter are in signal communication. These preferably has an electronic computer.

Basically, to Filling level measurement and / or Flow measurement can be used any knife method. Especially however, it is preferred for the degree of filling measurement to be a conductivity measurement and / or a capacitance measurement is performed and / or that for flow measurement, a volume flow measurement, in particular a Magnetic-inductive measurement is performed. This can be at high reliability a high measuring accuracy can be achieved.

Especially it is further preferred that the liquid is continuously through the line is passed through. Also the degree of filling measurement and / or the flow measurement can be carried out continuously, but at least repeatedly. In particular, it can be provided, the delivery rate of the liquid vary in time, for example, depending on of the properties of the medium in the line, preferably carried out depending on fill level can.

to further increase the measurement accuracy can be provided that in the line, in particular in the area of a measuring point for the degree of filling, one Pressure measurement performed becomes. For this purpose, suitably at least one pressure measuring device provided the line. The pressure measurement is based on the idea that gas or gas bubbles, in contrast to the liquid highly compressible is. Consequently, the measured fill level can be dependent on the current pressure. The results of the pressure measurement can be used to determine the flow rate with the results of the flow measurement and the results of the degree of filling will be charged. This is the at least one pressure measuring device suitably with the evaluation device in signal connection. A pressure measurement can also, for example, in the area of a measuring point for the Flow measurement performed become. in principle the pressure measurement can be carried out on any line sections, wherein a pressure measurement in several places is possible.

Basically it is possible according to the invention liquid for example, by gravity through the line. However, it is particularly preferred that the liquid by means of a on the Line arranged pump through the line is pumped. The feed pump can be designed for example as a centrifugal pump.

Further It is preferred that a pressure measurement in the conduit both upstream and also downstream from the feed pump is carried out. As a result, the measurement accuracy can be further increased.

In principle, the filling degree measurement and the flow measurement can be carried out at any measuring points in the line system. A particularly simple procedure with high measurement accuracy can be given by the fact that the filling degree measurement and the conductivity measurement are carried out at the same measuring point. For this purpose, the Füllgradmesseinrichtung and the flow measuring device can be combined and in particular have a common pair of electrodes, which can serve for example both for conductivity measurement and for magnetic-inductive flow measurement. With regard to the feed pump, the degree of filling measuring device and the flow measuring device can basically be arranged as desired. They can be arranged, for example, with regard to the feed pump on the same line side, but also on different line sides. If the Füllgradmesseinrichtung and the flow measuring device on the same Line side are arranged with respect to the feed pump, either the Füllgradmesseinrichtung or the flow measuring device can be arranged on the line closer to the feed pump.

Especially It is advantageous that the filling degree measurement especially upstream from the feed pump carried out is and that the pumping capacity of the feed pump is set depending on filling level. In this Case is thus the degree of filling measuring device used to control the pump. This is appropriate a control device provided with both the feed pump as well as with the degree of filling measuring device is in signal connection. The fill level dependent setting allows in particular, the pumping capacity of the feed pump with increasing gas content, for example, if the limit is exceeded, to reduce. To adjust the pump power can alternatively or additionally to Füllgradmesseinrichtung at least one further degree of filling measuring device be provided, which also combined with a temperature sensor can be.

A further advantageous embodiment of the Invention is that at least one of the preparation sites in a container is arranged, which is preferably carried out mobile. Preferably both locations are arranged in each case a different container. The at least one container can run as a tank be.

A self-priming promotion can according to the invention thereby be given that for sucking the liquid into the line at least temporarily a negative pressure in the line is generated. For this purpose, for example an ejector or a vacuum pump may be provided. A negative pressure can be generated in particular when the flow rate of the pumping device sinks or tears off due to excessively high proportions of gas, especially at the beginning or the end of the promotion the case may be.

The Measuring accuracy can be further increased by the fact that the liquid for the uniform distribution of the gas content upstream of the measuring point for the degree of filling a screen arranged in the cross section of the line is passed. This allows a particularly uniform distribution of gas bubbles over the Flow area the line are generated, which is a particularly accurate degree of filling measurement allowed. Alternatively or in addition to the screen, a filter, a grid and / or a flow straightener be provided.

to increase the delivery rate can be provided that one before the start of the promotion of the liquid in the line contained gas column over a vent line is derived from the line. This can be done on the vent line a vent valve be provided, depending on from one level switched in the vent line becomes. Suitably, the vent line to a housing of the feed pump arranged.

to further increase the measuring accuracy can, preferably at the beginning of the promotion, be provided, the degree of filling measuring device to flood and temporarily a flow arrest in the Füllgrademesseinrichtung to create. For this purpose, for example, the feed pump out of service be taken and / or the line by means of valves downstream of the degree of filling for a fluid passage be locked. This allows the degree of filling measuring device in particular at the beginning of the promotion with standing current the liquid to calibrate. In particular, the liquid while standing flow as long in the degree of filling measuring device are left until the gas fraction separated and / or from the Füllgradmesseinrichtung has leaked into remaining line areas.

One Another aspect of the invention lies in a device for quantity detection in the acceptance and / or delivery of a liquid, preferably milk or fuel, with at least one container for holding the liquid, a pipe, which at one end with the container in Flow connection stands and at its other end a flow opening for the liquid comprising a delivery pump arranged on the line for pumping the liquid through the pipe, a Füllgradmesseinrichtung, which is arranged on the line, a flow measuring device, which is arranged on the line, and an evaluation device for the determination of the subsidized Amount of liquid the with the Füllgradmesseinrichtung and the flow meter is in signal communication.

The inventive device is in particular to carry out the method according to the invention suitable, whereby the advantages explained in this context are achieved can. The inventive device in particular as described in connection with the method accomplished be. The quantity detection may preferably be understood to mean volume detection become. Advantageously, the flow opening is on a receiving coupling provided the line.

A particularly low flow resistance and thus a particularly high flow rate can be achieved according to the invention in that the line, at least outside the feed pump, the Füllgradmesseinrichtung and / or the Flow measuring device, an at least approximately constant line cross-section. Advantageously, the line, at least outside the feed pump, the Füllgradmesseinrichtung and / or the flow measuring device, designed for an approximately linear flow, ie in particular for a along the conduit wall extending flow direction assuming a ideal laminar flow. The line is preferably formed without gas separator and without Gasmessverhüter.

The inventive device Can also be used as a measuring system for Milk and other liquid products, which are laden with air.

The Invention will be described below with reference to preferred embodiments explained in more detail, the schematic are shown in the figures. In the figures show:

1 to 6 Various embodiments of inventive devices in carrying out the method according to the invention.

Equal acting elements in the figures are consistent with the same Reference number marked.

A first embodiment of a device according to the invention is in 1 shown. The illustrated apparatus serves to convey a liquid from a first supply location 1 to a second deployment location 2 , The first deployment location 1 is in a tank designed as the first container 31 arranged and the second place of delivery 2 in a likewise designed as a tank, second container 32 , The second container 32 can be considered as part of the device according to the invention. In particular, like the entire device according to the invention, it can be provided on a tanker and / or a collection truck on a mobile basis.

The device has a conduit 10 on, which formed on the container designed as a container 32 is fixed. In the line 10 is a feed pump 20 arranged, which is designed as a centrifugal pump. Between the feed pump 20 and the collection container 32 are on the line 10 a degree of filling measuring device 5 and a flow meter 6 arranged. The degree of filling measuring device 5 is closer to the feed pump in the illustrated embodiment 20 arranged as the flow meter 6 , In principle, however, a reverse arrangement is possible in which the flow measuring device 6 located closer to the feed pump. The flow measuring device 6 and the degree of filling measuring device 5 can also be combined in a common facility.

Above the feed pump 20 is a vent line 40 provided with the line 10 is in fluid communication. At this vent line 40 are a vent valve 42 and above, a level gauge 45 arranged. Between the second container 32 and the feed pump 20 is in the lead 10 a check valve 16 arranged. In the illustrated embodiment, the check valve 16 between the feed pump 20 and the degree of filling measuring device 5 and the flow meter 6 arranged.

At his the collecting tank 32 opposite end has the line 10 a flow opening 12 on, on the line 10 by means of an acceptance coupling 15 detachable on the first container 31 is flanged. The flow opening 12 can also be referred to as inlet and / or drain opening. On the line 10 , In the illustrated embodiment, between the flow opening 12 and the feed pump 20 , is a temperature sensor 23 intended. By means of the temperature sensor 23 Temperature measurements on the conveyed liquid can be carried out, which can be used for quality control and / or compensation calculations, for example for conversion to a standard volume.

The temperature sensor 23 can also be designed as a combined temperature-Füllgradsensor, in particular as a combined temperature-conductivity sensor. In this case, the temperature-Fülldenssensor to control functions for the För derpumpe 20 be used. This makes it possible to regulate the pump power in the event of coarse air blows. A fine regulation of the pump can be based on the measured values of the degree of filling measuring device 5 take place, which can also be referred to as air bubble sensor.

A connection of the line 10 with the tank 31 can, as in 1 represented by a rigid tube piece 71 and / or, as in 2 represented by a flexible hose 72 respectively. As in 2 can be shown on the line 10 on the side of the acceptance coupling 15 also an acceptance valve 14 be provided.

The device according to the invention can be used to meter out liquid, in particular milk, from the first container 31 , which may also be referred to as a delivery tank, into the second container 32 , which can also be referred to as a target tank serve. The device can be arranged so that the acceptance coupling 15 and in particular also the delivery pump 20 , as in 2 shown, are arranged lower than the first container 31 , so that the liquid by gravity to the feed pump 20 can flow.

At the beginning of the promotion are the vent valve 42 as well as the acceptance valve 14 open. As a result, the product from the first container 31 to the pump 20 flow, with one in front of the product in the pipe 10 contained gas column via the vent line 40 is derived. As a result, a system ventilation can be realized, which is particularly advantageous when the feed pump 20 is designed as a non-self-priming pump, for example as a centrifugal pump. The vent allows reliable operation of the feed pump 20 with high efficiency.

Successful system ventilation can be achieved by means of the level gauge 45 be detected. Once this level measuring device 45 Wetting reports, the breather valve can 42 getting closed.

Now the pump can 20 be put into operation. As a result, pressure builds up on the check valve 16 opens. The liquid comes from the feed pump 20 in the Füllgradmesseinrichtung 5 which measures the proportion of gas in the product to be measured, and which may also be referred to as an air flow meter. From here, the complete liquid flow together with the gas component reaches the flow measuring device 6 , which can be designed as a volume meter. From the flowmeter 6 Finally, the liquid reaches the second container together with the gas component contained therein 32 ,

Unless the line 10 in the degree of filling measuring device 5 and the flow meter 6 is formed with the same cross section, the speed in the liquid column at the measuring devices 5 and 6 at least approximately the same size. This can be achieved, in particular, when the degree of filling measuring device 5 as a conductivity measuring device and the flow measuring device 6 is designed as a magnetic-inductive measuring device.

By means of the degree of filling measuring device 5 Alternatively or additionally, however, also by means of the temperature sensor designed as a combined temperature-Fülldenssensor 23 , The gas content, in particular the proportion of bubbles, can be monitored in the liquid, the monitoring preferably being repeated. Exceeds the gas content of a certain value, this indicates the end of the assumption and / or a suction in the first container 31 out. The pumping power of the feed pump 20 can then be reduced to reduce the suction. Especially with a higher lying first container 31 Thus, the entire assumption can be made with controlled and measured gas impact.

As for example the embodiment of 3 can be removed, between the feed pump 20 and the degree of filling measuring device 5 ie, upstream of the degree of filling gauge 5 , a filter and / or sieve 18 be provided. Through this filter and / or this sieve 18 Existing air bubbles can be crushed and evenly distributed before the filling degree measurement, which increases the measuring accuracy of the filling degree measurement.

As in the example of 3 is further shown, on the line 10 a pressure sensor 51 be provided. By means of this pressure sensor, the pressure of the fluid in the line 10 be measured and taken into account in the flow rate determination. Suitably, the pressure sensor is 51 in the immediate vicinity of the degree of filling measuring device 5 arranged. He can, as in 3 shown, but also downstream of the from the Füllgradmesseinrichtung 5 and the flow meter 6 existing measuring section are arranged. Preferably, the pressure sensor 51 on the same line side with respect to the feed pump 20 arranged as the Füllgradmesseinrichtung 5 ,

The embodiment of 3 differs from the embodiments of the 1 and 2 further by being in the line 10 bottom side of the second container 32 a bottom valve 36 is provided. Such a bottom valve 36 may be provided in particular when the second container 32 is arranged on a tanker. In particular, also, for example, on the same tanker, several second container 32 be provided, all over each a bottom valve 36 with the line 10 keep in touch. In this case, according to the invention via the measuring section in different second container 32 aerated milk, which was previously only conditionally possible with a dipstick tanker. The second container 32 For example, it can also be arranged on a trailer.

A further embodiment of a device according to the invention is in 4 shown. In the 4 shown device can serve both for the acceptance and for the delivery of gas-laden liquids with simultaneous quantity detection. In place of the check valve 16 the devices of 1 to 3 has the device of 4 a switchable valve 61 in the pipe 10 on. Such a switchable valve 61 optionally also as a bypass valve to the check valve 16 be provided.

In addition, the embodiment differs from the 4 from the preceding embodiments in that in the line 10 a filter and / or sieve 18 ' between the second container 32 and the degree of filling measuring device 5 is provided. Further, a pressure sensor 51 ' between the measuring section and the feed pump 20 on the line 10 arranged. The filter and / or the sieve 18 ' or the pressure sensor 51 ' may alternatively or in addition to the sieve 18 or to the pressure sensor 51 of the embodiment of 3 be provided.

At the beginning of the dispensing process with the device of 4 becomes the bottom valve 36 when the valve is closed 14 open.

Are several second containers 32 provided, so can by opening the corresponding bottom valve 36 the desired container to be emptied 32 to be selected. Was the lead 10 empty at the beginning of the dispensing process, so now can the vent valve 42 be opened and the feed pump 20 be flooded. The bleed valve 42 will be closed as soon as the detector 45 Liquid registered. The liquid is then at least up to the valve 14 , The filled level measuring device 5 can now be calibrated to the existing fluid. Subsequently, the feed pump 20 put into operation and the valve 14 open. The volume flow of the flowing product is determined by means of the flow measuring device 6 measured and the proportion of gas bubbles by means of the Füllgradmesseinrichtung 5 determined and charged to determine the flow rate with the flow.

The proportion of gas bubbles usually increases at the end of dispensing when a suction forms in the dispensing container. Exceeds the gas bubble portion a certain value, which means the Füllgradmesseinrichtung 5 can be determined, so the flow rate of the feed pump 20 be reduced. This may result in a stop-and-go operation, both in acceptance and in delivery.

Is the line 10 filled with liquid prior to dispensing, the volume of liquid contained herein may be taken into account in the flow rate determination. For this purpose, the inner volume of the line 10 for example, be preloaded in advance.

Another embodiment of a device for quantity detection is in 5 shown. The embodiment of 5 differs from the embodiments of the 1 to 3 essentially in that the degree of filling measuring device 5 ' between the acceptance coupling 15 and the feed pump 20 , ie suction side or upstream of the feed pump 20 is provided. This arrangement allows the gas content on the suction side of the feed pump 20 to measure and the measurement results to control the feed pump 20 consulted. This is advantageous in that with the Füllgradmesseinrichtung 5 ' As a rule, a particularly high measuring accuracy can be realized. With such an arrangement of the degree of filling measuring device 5 ' is it, as in 5 shown, particularly advantageous, if in each case a pressure sensor 51 . 51 ' both intake and discharge side of the feed pump 20 , ie on both sides of the feed pump 20 , is provided. As a result, different bubble sizes at different pressure conditions suction and discharge side of the feed pump 20 taken into account and measured to correct the calculated flow rate.

A further embodiment of a device according to the invention is in 6 shown. The embodiment of 6 differs from the embodiments described above in that it is designed as a self-priming system with a vacuum generating device. The negative pressure generating device has an ejector 57 on, the end of the vent line 40 is arranged. The vacuum generating device further comprises a compressed air generator 59 on, by means of which the ejector 57 via a controllable valve 58 can be acted upon with compressed air. Alternatively or additionally, the vacuum generating device may also include a vacuum pump, which also end to the vent line 40 can be arranged.

By means of the vacuum generating device in the intake system (area A), a negative pressure can be generated when the vent valve 42 is opened. Will now be the acceptance valve 14 opened, so liquid from the first place of delivery 1 from the first container 31 sucked. That in the hose 72 Existing air volume is through the ejector 57 blown out and evacuated the intake system in area B. Once the liquid from the first container 31 the level measuring device 45 has reached, the system is filled and the vent valve 42 and in particular also the control valve 58 can be closed.

The - now filled - feed pump 20 can be put into operation, whereupon builds up a pressure and the second container 32 is filled. Any existing air bubble content is in the Füllgradmesseinrichtung 5 measured and with the flow rate in the flowmeter 6 is measured, charged.

If the proportion of air is too high, the pumping capacity of the feed pump becomes 20 scaled back. Supporting the vacuum generating device can be activated with increasing gas content to Preventing excessive air blows, for example, at the end of the assumption, the promotion of the feed pump 20 tears off and / or the built-up pressure is no longer sufficient to the check valve 16 to open.

The embodiment of 6 represents a self-priming pumping system that allows accurate volume volume detection without an air separator or gas meter.

at all embodiments the method according to the invention the gas bubble portion of the volume flow is measured and used to determine the Total volume metrologically exploited.

Claims (13)

Method for conveying and for measuring the flow rate of a gas-containing liquid, in particular milk or fuel, from a first delivery location to a second delivery location, in which - the liquid with the gas content from the first delivery location ( 1 ) into a line ( 10 ), - the liquid with the gas fraction through the pipe ( 10 ), - in the line ( 10 ) a filling degree measurement is carried out, - in the line ( 10 ) a flow measurement is carried out, - the liquid together with the gas component contained therein from the line ( 10 ) into the second deployment site ( 2 ) and - the results of the flow measurement are offset with those of the degree of filling measurement to determine the flow rate. Method according to claim 1, characterized, - that to degree of filling a conductivity measurement and / or a capacitance measurement is carried out, and or - that to Flow measurement a volume flow measurement, in particular a magnetic-inductive measurement carried out becomes. Method according to one of claims 1 or 2, characterized in that the liquid is continuously through the line ( 10 ). Method according to one of claims 1 to 3, characterized in that in the line ( 10 ), in particular in the region of a measuring point for the degree of filling, a pressure measurement is performed. Method according to one of claims 1 to 4, characterized in that the liquid by means of a on the line ( 10 ) arranged delivery pump ( 20 ) through the line ( 10 ) is pumped. A method according to claim 5, characterized in that a pressure measurement in the line ( 10 ) both upstream and downstream of the feed pump ( 20 ) is carried out. Method according to one of claims 5 or 6, characterized in that - the filling degree measurement in particular upstream of the feed pump ( 20 ) is performed and - that the pumping power of the feed pump ( 20 ) is set depending on filling level. Method according to one of claims 1 to 7, characterized in that at least one of the preparation sites ( 1 . 2 ) in a container ( 31 . 32 ), which is preferably carried out mobile. Method according to one of claims 1 to 8, characterized in that for sucking the liquid into the conduit ( 10 ) at least temporarily a negative pressure in the line ( 10 ) is produced. Method according to one of claims 1 to 9, characterized in that the liquid for uniform distribution of the gas fraction upstream of the measuring point for the degree of filling by a cross-section of the line ( 10 ) arranged sieve ( 18 ) or by a cross-section of the line ( 10 ) arranged filter is passed. Method according to one of claims 1 to 10, characterized in that a prior to the start of the promotion of the liquid in the line ( 10 ) contained gas column via a vent line ( 40 ) from the line ( 10 ) is derived. Device for quantity acquisition in the acceptance and / or delivery of a liquid, preferably of milk or fuel, in particular for carrying out the method according to one of claims 1 to 11, comprising - at least one container ( 32 ) for receiving the liquid, - a line ( 10 ), which at one end with the container ( 32 ) is in fluid communication and at its other end a flow opening ( 12 ) for the liquid, - one on the line ( 10 ) arranged delivery pump ( 20 ) for pumping the fluid through the conduit ( 10 ), - a degree of filling measuring device ( 5 ) on the line ( 10 ), - a flow measuring device ( 6 ) on the line ( 10 ), and - an evaluation device for determining the amount of liquid delivered, which corresponds to the degree of filling measuring device ( 5 ) and the flow measuring device ( 6 ) is in signal connection. Apparatus according to claim 12, characterized in that the line ( 10 ), at least outside the feed pump ( 20 ), the degree of filling measuring device ( 5 ) and / or the flow measuring device ( 6 ), an at least approximately constant line cross-section.