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It is described a method of measurement of the volume VD of the flow-rate of electrically conductive liquids the conductivity of which is at least codetermined by at least one parameter p, wherein the liquid flows through a vessel having a predetermined shape, and wherein the respective filling volu

It is described a method of measurement of the volume VD of the flow-rate of electrically conductive liquids the conductivity of which is at least codetermined by at least one parameter p, wherein the liquid flows through a vessel having a predetermined shape, and wherein the respective filling volume Vo is determined by at least one measured value x, which is measured by an electrical conductivity measuring device comprising electrodes, wherein the vessel is filled in succession and then is emptied through its outlet, through which the filling heights h are constantly changing. At least one reference table comprising calibration measured values xR and filling volumes Vo belonging to them is constructed by means of calibration measurements using several liquid samples, which have different p-values and different filling heights h in the vessel. The measured values x are measured in time intervals and the respective filling volumes Vo are determined by comparison of the respective measured values x with values xR of the table, and the volume VD of the rate of flow is determined from the filling volumes Vo over a time period. The measuring device for the determination of the volume VD of flow rate of electrically conductive liquids through a vessel comprises at least two measuring electrodes.

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1. A method of measurement of a volume VD of a flow-rate of electrical conductive liquids a conductivity of which is at least codetermined by at least one parameter p, wherein the liquid flows through a vessel having a predetermined shape, and wherein the respective filling volume V0 in the vessel i

1. A method of measurement of a volume VD of a flow-rate of electrical conductive liquids a conductivity of which is at least codetermined by at least one parameter p, wherein the liquid flows through a vessel having a predetermined shape, and wherein the respective filling volume V0 in the vessel is determined by at least one measured value x, which is measured by an electrical conductivity measuring device comprising at least two measuring electrodes,wherein the vessel is filled in succession and then is emptied through its outlet, through which filling heights h are constantly changing, comprising the steps of:measuring the measured values x in time intervals and determining the respective filling volumes V0 by comparison of the respective measured values x with calibration measured values xR of at least one reference table comprising at least calibration measured values xR and filling volumes V0 belonging to them, anddetermining the volume VD of the rate of flow from the filling volumes V0 over a time period,wherein the at least one reference table is constructed by means of calibration measurements using several liquid samples, which have different p-values and different filling heights h in the vessel. 2. The method according to claim 1, wherein the at least one reference table is deposited in a memory of the measuring device. 3. The method according to claim 1, wherein a first reference measured value x1 is measured at least once during said time period. 4. The method according to claim 3, wherein said first reference measured value x1 is measured only once at the beginning of a filling procedure starting from an empty vessel. 5. The method according to claim 3, wherein said first reference measured value x1 is measured by the same two measuring electrodes which are used for the measurement of the measured value x. 6. The method according to claim 3, wherein said first reference measured value x1 is measured every time when the measured value x is measured. 7. The method according claim 6, wherein the first reference measured value x1 is measured by a reference electrode and one of the measuring electrodes which are used for the measurement of the measured value x. 8. The method according to claim 3, wherein a first reference table is constructed, which contains calibration first reference measured values x1R and values of parameter p belonging to them, wherein a second reference table is constructed which contains at least the calibration measured values xR, the values of parameter p and the filling heights h belonging to them andwherein a third reference table is constructed which takes into account the shape of the vessel and which contains the filling heights h and the volumes V0 belonging to them. 9. The method according to claim 8, wherein the value of parameter p is determined at least from the first reference measured value x1 by comparison with the values of first reference table, wherein the filling height h is determined from at least the measured value x and the values of parameter p by comparison with the values of the second reference table andwherein the respective filling volume V0 is determined from the filling height h by comparison with the values of the third reference table. 10. The method according to claim 9, wherein the measured value x is referred to the first reference measured value x1 in order to determine a first calibrated value I1. 11. The method according to claim 10, wherein the first calibrated values I1 are deposited in the first and/or in the second reference table. 12. The method according to claim 1, wherein a second reference measured value x2 is measured at least once during said time period. 13. The method according to claim 12, wherein said second reference measured value x2 is measured only once at the beginning of a filling procedure starting from an empty vessel. 14. The method according to claim 12, wherein said second reference measured value x2 is measured every time when the measured value x is measured. 15. The method according to claim 12, wherein said second reference measured value x2 is measured by means of a reference circuit of the electrical conducting measuring device. 16. The method according to claim 11, wherein the first reference measured value x1 is referred to the second reference measured value x2 in order to determine a second calibrated value I2. 17. The method according to claim 16, wherein the calibrated values I2 are deposited in the first reference table. 18. The method according to claim 11, wherein characterized in that the values of the parameter p are determined from the calibrated values I1 and I2 by comparison with the values of the first reference table. 19. The method according to claim 11, wherein the filling height h is determined from the values of parameter p and the first calibrated value I1 by comparison with the values of the second reference table. 20. The method according to claim 1, wherein the filling volume V0 of water is determined. 21. The method according to claim 1, wherein a hardness H of water is determined as parameter p. 22. The method according to claim 12, wherein at least the measured values x, x1 and/or x2 are time values. 23. The method according to claim 22, wherein the charging and/or discharging time of a capacitor means in a circuit of the electrical conductivity measuring device is used as time value. 24. The method according to claim 22, wherein at least the measured values x are measured at least once per second. 25. The method according to claim 24, wherein the measured values x are measured at least five times per second. 26. The method according to claim 1, wherein the changes ΔV of the filling volume V0 are determined and that the volume VD of the flow rate is determined from the volume changes ΔV. 27. The method according to claim 26, wherein the volume VD of the flow rate is determined from the respective volume increase. 28. The method according to claim 26, wherein the volume VD of the flow rate is compared with a volume Vmax, wherein Vmax designates the maximum volume of the liquid characterized by at least one parameter p and is allowed to flow through a filter device which is arranged downstream to the vessel and which contains at least one filter medium and wherein exhaustion of the filter medium is indicated, when Vmax is reached. 29. The method according to claim 28, wherein the volume Vmax is determined from the value of parameter p by comparison with the values of a fourth reference table, which contains the respective volumes Vmax dependent from various values of parameter p. 30. The method according to claim 28, wherein the exhaustion is indicated acoustically and/or optically. 31. The method according to claim 28, wherein the remaining volumes are indicated acoustically and/or optically before the exhaustion of the filter medium is reached. 32. The method according to claim 28, wherein a filter cartridge is used as filtering device. 33. The method according to claim 32, wherein the filter cartridge is located in the outlet of the vessel. 34. A measuring device for the determination of the volume VD of the flow-rate of electrical conductive liquids through a vessel wherein the filling heights h are changing in a vertical direction and wherein the vessel comprises an inlet, an outlet and a conductivity measuring device which comprises an evaluation unit and at least two measuring electrodes wherein the measuring electrodes are located in the vessel and are connected to the evaluation unit, wherein at least one measured value x is measured by the measuring electrodes characterized in that the evaluation unit is configured for the deposition of at least one reference table comprising at least calibration measured values xR and filling volumes V0 belonging to them and for comparison of the measured values x of the conductivity measuring device with the calibration measured values xR of the at least one reference table and for the determination of the volume VD of the flow rate from the filling volumes V0. 35. The measuring device according to claim 34, wherein both measuring electrodes extend over a total filling height of the vessel and that both measuring electrodes are unshielded. 36. The measuring device according to claim 34, wherein a reference electrode is provided which is located near the measuring electrodes. 37. The measuring device according to claim 36, wherein the reference electrode is shielded with the exception of its lower surface. 38. The measuring device according to claim 36, wherein the electrodes have a constant cross-section along their length. 39. The measuring device according to claim 34, wherein the evaluation unit comprises a capacitor means and that a charging and/or discharging time of the capacitor means is the measured value x. 40. The measuring device according to claim 34, wherein the evaluation unit comprises a reference circuit including a reference resistor. 41. The measuring device according to claim 34, wherein an indication unit is provided. 42. The measuring device according to claim 41, wherein the indication unit is an optical and/or acoustical unit. 43. The measuring device according to claim 38, wherein the electrodes are combined in a measuring stick. 44. The measuring device according to claim 43, wherein the measuring stick is integrated into a wall of the vessel. 45. The measuring device according to claim 35, wherein the vessel is a feeding hopper of a water filtration device. 46. Using the measuring device according to claim 34 as exhaustion measuring device for filter cartridges. 47. The use of the measuring device according to claim 46, wherein the indication unit indicates the time of change of the filter cartridge.