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EP2373958A1 - Dispositif de mesure de la conductivité et dispositif de traitement de liquides - Google Patents

Dispositif de mesure de la conductivité et dispositif de traitement de liquides

Info

Publication number
EP2373958A1
EP2373958A1 EP09765118A EP09765118A EP2373958A1 EP 2373958 A1 EP2373958 A1 EP 2373958A1 EP 09765118 A EP09765118 A EP 09765118A EP 09765118 A EP09765118 A EP 09765118A EP 2373958 A1 EP2373958 A1 EP 2373958A1
Authority
EP
European Patent Office
Prior art keywords
electrodes
shielded
exposed
container
carrier body
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Withdrawn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
EP09765118A
Other languages
German (de)
English (en)
Inventor
Stefan Hother
Uwe Lang
Colin Henderson
Thomas Köhler
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.)
Brita SE
Original Assignee
Brita SE
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 Brita SE filed Critical Brita SE
Publication of EP2373958A1 publication Critical patent/EP2373958A1/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Withdrawn legal-status Critical Current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
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • G01F23/241—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid for discrete levels
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • G01F23/241—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid for discrete levels
    • G01F23/242—Mounting arrangements for electrodes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/05—Conductivity or salinity

Definitions

  • the invention relates to a conductivity measuring device according to the preamble of claim 1.
  • the invention also relates to a fluid treatment device according to the preamble of patent claim 25.
  • Such conductivity measuring devices are used in particular for measuring the filling level of water, e.g. used in water filter devices and to determine appropriate flow rates.
  • a conductivity measuring device with a measuring element which has on a support body on opposite sides extending in the vertical direction extending electrodes, which widen up to take into account the container shape in the determination of the level.
  • One embodiment also provides rod-shaped electrodes extending in the vertical direction, the wall of the container obeying an exponential function.
  • EP 1589325 A2 disclosed a conductivity measuring device with a measuring element which likewise has rod-shaped electrodes which have continuous contact surfaces from bottom to top.
  • the electrodes have at least one shielded area in the area of the first end, wherein each electrode has at least one first and one second exposed contact area adjacent to the shielded area, and wherein the vertical extent of the shielded area is greater than the vertical extent of the firstmaschinefikiee.
  • the first contact surface is below and the second contact surface above.
  • the shielded area is located between the two exposed contact areas.
  • the vertical extension of the first contact surfaces is therefore preferably to be chosen so small that the measurement time for the determination of the desired parameter of the liquid is greater than the time that elapses until complete contact of the firstmaschinefikieen. Also, the vertical extent of the shielded area should be so large that the measuring process is completed until the second contact surfaces are reached by the level.
  • the vertical extent of the shielded area should be as low as possible, so that as far as possible below the level measurements on the contacting of the second contact surface can be performed.
  • the level change should result in full contact of the first pad in a time ⁇ 20 msec.
  • the vertical extent of the shielded area must be so large that the level change requires a time> 20 msec until the second contact area is reached.
  • the vertical extent of the shielded area is smaller than the vertical extent of the second contact area, wherein the vertical extent of the second contact area is preferably oriented to the vertical dimension of the liquid container in which the conductivity measuring device is arranged.
  • the electrodes are completely embedded in the shielded area in the carrier body. This has the advantage that the liquid has no possibility to contact the electrodes in this shielded area, so that a falsification of the Parametermessu ⁇ g can not take place.
  • the first exposed contact surface comprises at least the end face at the first end of the electrode. Since the end face extends only in the horizontal direction and has no vertical component, the time for the volumetric contacting is very short, so that a large measurement accuracy is achieved in determining the desired parameter.
  • the electrodes can protrude downwards from the carrier body in relation to the lower end of the shielded area. In this embodiment too, care must be taken to ensure that the vertical extent of the side surfaces the electrodes are so low that the desired measurement accuracy is achieved.
  • channels for receiving the electrodes are formed in the region of the carrier body, wherein the electrodes are arranged set back in these channels. At the beginning of the filling process, the liquid rises within these channels and contacts the end faces of the electrodes.
  • This embodiment has the advantage that wave movements of the rising liquid exert no influence on the measurement accuracy.
  • the channels must preferably be dimensioned so that a smooth rise of the liquid within the channels to reach the end faces of the electrodes is ensured.
  • the first exposed contact surface may also be a side surface in the region of the first end of the electrode.
  • the end face is preferably shielded in this embodiment.
  • the first exposed Kunststoffintestininfiamba of the two electrodes are arranged opposite one another.
  • these surfaces are arranged in a protected area, so that spray water and the like can not lead to a falsification of the measured values.
  • the first exposed side surface is provided spaced from the end face, wherein the end face is preferably shielded.
  • the second exposed contact surface is preferably a side surface of the electrodes. This second exposed side surface extends from the shielded area to the region of the second end of the electrode and serves for the Grenchnbetician. The vertical extent of this second contact surface depends on the height of the container in which the conductivity measuring device is arranged.
  • the electrodes have a constant cross section over their length, wherein the cross section may be, for example, round. This simplifies the manufacture of the electrodes.
  • the electrodes are preferably rod-shaped.
  • the carrier body is a carrier plate and the electrodes are arranged side by side in the plane of the carrier plate.
  • the provision of the electrodes on a common carrier plate has the advantage that a unit is formed which can be arranged in a simple manner in the respective liquid container.
  • the carrier body preferably has a recess at the lower end between the electrodes. Thereby two legs are formed, in which the lower end portions of the electrodes are preferably housed with the shielded area.
  • the recess has the advantage that between the two electrodes, in particular between their end faces, no liquid film can form, which could lead to incorrect measurement.
  • the drainage of liquid is also favored by this design.
  • Another embodiment for preventing a disturbing liquid film provides that the lower end of the carrier body is chamfered. By this bevel, preferably in the transverse direction of the support plate, the drainage of residual liquid is also favored.
  • the electrodes may consist of a metal, in particular of a steel.
  • the carrier body can be made of an electrically non-conductive plastic, regardless of the electrode material.
  • plastic offers the advantage that by hydrophobic additives, the drainage of the liquid can be promoted, so that incorrect measurements are avoided.
  • the device preferably further comprises an evaluation device, which preferably also includes the power supply.
  • the evaluation device can be arranged externally. It is also possible to integrate the evaluation device in the measuring element, so that a compact element is created, which can be installed in a simple manner in a liquid container.
  • the invention also relates to a liquid treatment device having a first container for receiving untreated liquid and a second container for receiving treated liquid and having a conductivity measuring device for determining the filling height of electrically conductive liquids with a measuring element having a carrier body and at least two rod-shaped, a first and having a second end and extending in the vertical direction electrodes.
  • the electrodes have a shielded area in the area of the first end, wherein each electrode has at least one first and one second exposed contact area adjacent to the shielded area.
  • the second contact surface of the electrodes is preferably arranged protected against spray liquid and waves in the container.
  • the measuring element is arranged benachtbart to a wall of the container and that the second exposed contact surface of the electrodes faces the wall.
  • Shielding be provided before splashing.
  • Shielding can be carried out, for example, by means of a partition wall arranged in the container.
  • a preferred liquid treatment device is a water treatment device, in particular a
  • FIG. 1 shows a side view of a conductivity measuring device with a measuring element
  • Figure 2 is a plan view of the end face of the measuring element of
  • FIG. 1 Figure 3 is a section along the line W-II! by the measuring element shown in FIG. 1,
  • FIG. 4 shows a side view of a conductivity measuring device according to a further embodiment
  • FIG. 5 shows a side view of a measuring element according to a further embodiment
  • FIG. 6 shows a side view of a measuring element according to a further embodiment
  • FIG. 7 shows a section through the measuring element according to FIG. 6 along the line VII - VII, FIG.
  • FIG. 8 is a front view of a conductivity measuring apparatus according to another embodiment.
  • FIG. 9 is a rear view of that shown in FIG.
  • Figure 10 is a vertical section through a
  • the 1 shows the front side 32 of a conductivity measuring device 1, which comprises a measuring element 10, which is connected via connections 62 to an evaluation device 60.
  • the evaluation device 60 preferably also includes its own power supply.
  • the measuring element 10 has a carrier body 12, on which two electrodes 40a, b are arranged. The carrier body 12 and the electrodes 40a, b extend in the vertical direction.
  • the electrodes 40a, b have a first exposed contact surface 46, which in the embodiment shown here are formed by the end faces 48 of the electrodes 40a, b.
  • the electrodes 40 a, b terminate with their first end 42 flush with the lower end of the carrier body 12.
  • the first exposed contact surface 46 is followed by a shielded region 22 at the top.
  • the electrodes 40a, b extending through the shielded region 22 are shown in dashed lines.
  • the second exposed contact surface 52 connects, which is formed by a side surface 53 of the electrodes 40a, b.
  • the electrodes 40 a, b extend to the upper end 14 of the carrier body 12 and are connected to the terminals 62.
  • FIG. 1 shows the front side 32 of the measuring element 10.
  • the first contact with the liquid to be measured takes place via the first exposed contact surface 46, so that a first measurement for determining a parameter of the liquid can be carried out.
  • a first measurement for determining a parameter of the liquid can be carried out.
  • the fill level increases (see also FIG. 10)
  • nothing changes at the contacting of the first exposed area because the electrodes are shielded in the region 22 lying above it. Only when the level reaches the upper end 24 of the shielded area 22 and the second exposed contact surface 52 contacts, the further measurements for determining the level height can be performed.
  • a certain time is needed, which can be used for the measurement at the end faces 48 of the two electrodes 40a, b.
  • the vertical extent of the shielded area 22 is chosen so large that sufficient time is available for this measurement at the end faces 48.
  • FIG. 2 shows the bottom view of the measuring element 10. It can be seen that the electrodes 40a, b are completely embedded in the carrier body 12 and that only the end faces 48 are exposed.
  • FIG. 3 shows a section along the line III-III through the device shown in FIG. It can be seen that the electrodes 40 a, b have a circular cross-section and are embedded with a part in the carrier body 12. The other part of the electrodes 4Oa 1 b is exposed and forms the contact surfaces 52, 53.
  • FIG. 4 shows a further embodiment which has an inclined surface 17 at the lower end 16 of the carrier body 12. In this way it is prevented that a liquid film can form between the end faces 48 of the electrodes 40a, b. Due to the oblique design of the lower end face of the carrier body 12, residual liquid can run off easily.
  • the two electrodes 40a, b project downwards relative to the lower end 16 of the carrier body 12. Because of the inclined surface 17, the first ends 42 of the electrodes 40a, b are arranged offset in height to ensure equal first contact surfaces 46. Not only the end surfaces 48, but also the adjacent side surfaces of the electrodes 40a, b serve as the first free contact surface. The vertical extent of these side surfaces may be formed only short and must be adapted to the required measurement time, taking into account the change in the time of the level. The level must reach the shielded area as quickly as possible so that the measurement via the two first exposed contact surfaces is not influenced by the rising level of the liquid.
  • FIG. 6 shows a further embodiment in which the shielded region 22 also includes the end faces 48 of the electrodes 40a, b.
  • the carrier body 12 has a window 36, so that the two first contact surfaces 46, which are formed by the side surfaces 50, are arranged opposite one another.
  • This arrangement has the advantage that the two first exposed contact surfaces 46 are arranged in a liquid-calmed area and wave movements or splash water do not lead to a measurement value corruption.
  • FIG. 7 shows a section along the line VII - VII through this lower region of the measuring element 10 in the region of the window 36. It can be seen that here too the electrodes 40a, b have a circular cross section and are embedded with a part in the carrier body 12.
  • the measuring element 10 has a recess 38 which extends in the vertical direction almost over the entire shielded region 22.
  • two legs 39 a, b were formed, which essentially comprise the shielded areas 22.
  • the two end faces 48 of the electrodes 40a, b can be seen.
  • the support body 12 is shown as in the previous embodiments as a substantially plate-shaped element. In contrast to the preceding embodiments, the support body has two grooves 18 and 20, in which the electrodes 40a, b are arranged. The second fingeriiegenden contact surfaces 52 are thereby additionally protected protected against spray and sloshing.
  • FIG. 9 shows the rear side 34 of the measuring element 10.
  • FIGS. 8 and 9 shows a
  • Evaluation device 60 which is an integral part of
  • FIG. 10 shows a water treatment device 70. It is a water filter with a water funnel, which forms the first container 72. This first container 72 is arranged on a second container 86, which forms a pot. In the bottom 80 of the first container is a filter cartridge 84. In the opening 76 of the lid 74, the liquid to be filtered 92 is filled in the liquid passes through the filter cartridge 84 and is filtered there. The filtered water 94 enters at the bottom of the filter cartridge 84 in the second container 86 with bottom 88 and is collected there.
  • a conductivity measuring device 1 is shown schematically.
  • the evaluation device 60 is arranged in the region of the cover 74 and preferably also comprises a display device, which is visible from above. This display device preferably displays the amount of water that has flowed through the filter cartridge and / or the exhaustion of the filter cartridge. Downwardly extending from the evaluation device 60, the measuring element 10, as has been described in the previous embodiments. It can be seen that the front side 32, which has the exposed contact surfaces 52, faces the right wall 82.
  • Splashing water and sloshing water which is characterized by the arrows 78 and can occur during filling through the opening 76 in the lid 74, at most sprays against the back 34 of the measuring element 10 and thus can not reach the exposed contact surfaces 52 on the front 32.
  • a falsification of the measured values by spray water 78 and sloshing water is largely avoided.
  • a conductivity measuring device 1 is provided in the second container 86.
  • the Rear side 34 of the wall 90 of the second container 86 facing, while the exposed contact surfaces bearing front 32 are directed into the container interior.
  • the second container 86 has a partition wall 96 in the lower area, which covers substantially the entire front side 32 of the device 1.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

L'invention porte sur un dispositif de mesure de la conductivité (1), au moins pour déterminer le niveau de remplissage de liquides électro-conducteurs. Selon l'invention, ledit dispositif comporte un élément de mesure (10) comprenant au moins un corps de support (12) et au moins deux électrodes (40a, b) présentant une première extrémité (42) et une seconde extrémité (44), et s'étendant dans la direction verticale, les électrodes (40a, b) comportant, dans la zone de la première extrémité (42), au moins une zone blindée (22), et chaque électrode (40a, b) comportant au moins une première et une deuxième surface de contact (46, 52) exposées, dont chacune est contiguë à la zone blindée (22). L'invention porte aussi sur un dispositif de traitement de liquides (70) comportant un tel dispositif de mesure de la conductivité (1).
EP09765118A 2008-12-10 2009-12-09 Dispositif de mesure de la conductivité et dispositif de traitement de liquides Withdrawn EP2373958A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008054479A DE102008054479A1 (de) 2008-12-10 2008-12-10 Leitfähigkeitsmessvorrichtung und Flüssigkeitsbehandlungsvorrichtung
PCT/EP2009/066748 WO2010066798A1 (fr) 2008-12-10 2009-12-09 Dispositif de mesure de la conductivité et dispositif de traitement de liquides

Publications (1)

Publication Number Publication Date
EP2373958A1 true EP2373958A1 (fr) 2011-10-12

Family

ID=42029890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09765118A Withdrawn EP2373958A1 (fr) 2008-12-10 2009-12-09 Dispositif de mesure de la conductivité et dispositif de traitement de liquides

Country Status (11)

Country Link
US (1) US20110240475A1 (fr)
EP (1) EP2373958A1 (fr)
JP (1) JP2012511706A (fr)
CN (1) CN102246011A (fr)
AU (1) AU2009324407A1 (fr)
CA (1) CA2747129A1 (fr)
DE (1) DE102008054479A1 (fr)
IL (1) IL213423A0 (fr)
RU (1) RU2507485C2 (fr)
TW (1) TW201024686A (fr)
WO (1) WO2010066798A1 (fr)

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Also Published As

Publication number Publication date
TW201024686A (en) 2010-07-01
WO2010066798A1 (fr) 2010-06-17
US20110240475A1 (en) 2011-10-06
IL213423A0 (en) 2011-07-31
AU2009324407A1 (en) 2011-07-07
RU2507485C2 (ru) 2014-02-20
JP2012511706A (ja) 2012-05-24
DE102008054479A1 (de) 2010-06-17
CN102246011A (zh) 2011-11-16
CA2747129A1 (fr) 2010-06-17
RU2011128318A (ru) 2013-01-20

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