EP0886777A1 - Messgerät zur ermittlung von zustandsgrössen eines flüssigen mediums - Google Patents
Messgerät zur ermittlung von zustandsgrössen eines flüssigen mediumsInfo
- Publication number
- EP0886777A1 EP0886777A1 EP97914247A EP97914247A EP0886777A1 EP 0886777 A1 EP0886777 A1 EP 0886777A1 EP 97914247 A EP97914247 A EP 97914247A EP 97914247 A EP97914247 A EP 97914247A EP 0886777 A1 EP0886777 A1 EP 0886777A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- measuring
- measuring device
- housing part
- sensors
- data logger
- 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.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/14—Housings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/24—Housings ; Casings for instruments
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D9/00—Recording measured values
- G01D9/005—Solid-state data loggers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1886—Water using probes, e.g. submersible probes, buoys
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/283—Means for supporting or introducing electrochemical probes
- G01N27/286—Power or signal connectors associated therewith
Definitions
- Measuring device for determining state variables of a liquid medium
- the invention relates to a measuring device that can be completely immersed in a liquid medium and that can be connected via electrical lines to a power supply and a data processing device to determine chemical and / or physical state variables of the liquid medium.
- a measuring probe In the case of a measuring device (DE-94 04 359.0 Ul), a measuring probe has a cylindrical probe body, into the lower end of which an adapter is inserted which is designed to hold measuring sensors in such a way that cylindrical measuring sensors also have their rear end in the adapter are inserted, whereas their front end - and thus the measuring head - projects downward beyond the adapter piece and the housing edge and is overlapped by a protective grille.
- DE-25 31 784 C2 discloses a measuring arrangement for measuring the temperature and pressure of a medium in boreholes, in which a resistance which changes its electrical resistance value with temperature and a pressure sensor are provided for measuring the pressure which are connected via measuring signal lines to an evaluation unit located outside the borehole.
- This arrangement is only suitable for recording temperatures and pressure measurements. Adaptability to high measurement requirements, for example if five or more system parameters are to be measured, cannot be achieved with this measurement arrangement.
- a combination probe for exhaust gas measurements on gas and oil heating systems is known from DE 80 26 460 U1, in which a double jacket tube with an inner jacket and an outer jacket and a thermocouple are provided. to This probe is not suitable for determining any measured values in liquid media.
- the invention is based on the problem of creating a device for measuring the nature of liquid media, which can be expanded from an inexpensive probe for detecting the water pressure to a most complex measuring device for detecting various parameters.
- a high degree of variability of the measuring device is achieved through the optional mounting of a pressure measuring housing part receiving the pressure measurement either directly onto the housing part receiving the data logger or with the interposition of an intermediate housing part enclosing a sensor unit.
- the pressure measuring housing part can be mounted directly on the housing part receiving the data logger, a very cheap basic measuring device, which can be expanded at any time, is made available when there is an exclusive demand for a pressure measurement - possibly even combined with a temperature measurement .
- the sensor unit can be equipped particularly advantageously with a plurality of sensors, all of which have their sensor head in one measuring plane, both the number of sensors installed and their arrangement in the sensor unit being variable.
- the measuring device cannot only be expanded from a pressure measuring device to a multiple measuring device, but the type of measurements can be adapted to the needs of the users at any time.
- the sensors can be disassembled after replacement, so that the used measuring electrode can be released from its mechanical holder and electrical contact and the latter can be provided with a new measuring electrode. Further advantages result from the following description and the drawing.
- the drawing shows:
- FIG. 1 shows a cross section through a measuring device according to the invention with housing parts mounted to one another and with a mounted pressure measuring area and a mounted sensor unit,
- FIG. 6 shows a cross section of a measuring device for pressure and temperature measurement without an assembled intermediate housing part and without a sensor unit
- FIG. 7 shows a cross section of the housing part accommodating the data logger with the sensor unit inserted and the pressure measuring area installed, but without the intermediate housing part and the pressure measuring housing part
- 8 shows a cross-sectional detailed illustration of the upper end of the sensor unit.
- the measuring device 1 comprises a housing part 2 for receiving the data logger 5, an intermediate housing part 3 for receiving the sensor unit 6 and a pressure measuring housing part 4 for receiving the pressure measuring area 7.
- the housing part 2 has an analogous conclusion on its lower edge 8 the intermediate housing part 3 on its lower edge 9, so that the pressure measuring housing part 4 can be mounted both on the lower edge 8 of the housing part 2 receiving the data logger 5 and on the lower edge 9 of the intermediate housing part 3 receiving the sensor unit 6.
- the data logger housing 2 is provided at its upper end, ie connected to the lines leading to the outside, with an end cap 11 which is placed on the upper edge 10 of the housing part 2 receiving the data logger 5 and is provided with reliable protection against it by a sealing body 14 provides penetrating liquids.
- the sealing body 14 has two sealing seats 12 and 13, which are filled with O-rings and thereby bring about the required tightness. In the middle of the sealing body 14 there is the plug-in projection 15 for the assembly of the outwardly leading and not shown ten cable, which serves on the one hand as a data line and on the other hand as a supply line for the measuring device 1.
- the cable can either be cast on, in order to represent a cost-effective and tight solution, or it can, as in the case shown here, be plugged on, so that cables of different lengths can optionally be installed and exchanged for one another.
- the energy supply is expediently located outside of the measuring device and can be lowered as a battery pack below the surface of the earth, for example when the measuring device is lowered in a level tube for groundwater measurement.
- the data logger 5 represents a cylindrical component, in the interior of which there is essentially an analog-digital converter, which converts the incoming and incoming data as analog voltages into digital measurement signals, as well as an intermediate memory in which the digitized data are stored, as well as a possibility of forwarding the stored data to an externally connected computer.
- the addressing and control components required for carrying out measurement programs and forwarding measurement data are implemented either in hardware or software in the data logger 5.
- the data logger 5 there can be one unit for calculating one that is still available Battery or an accumulator removable - residual energy may be arranged.
- connection between the individual housing parts can, for example, be via a Screw threads occur so that the individual housing parts must be rotated against each other for assembly, or also by a fastening in which the housing parts remain stationary relative to one another, for example a union nut or another known way of fastening a plurality of pipe sections to one another.
- the device Since the device has to be used frequently for groundwater measurement through level pipes with a diameter of generally 2 ", it is necessary to keep the outside diameter of the measuring device 1 small and to take this into account when connecting the housing parts 2, 3 and 4 .
- the intermediate housing part 3 has an internal thread 16 which is connected to the external thread 8 'of the housing part 2 provided for receiving the data logger 5.
- an external thread 17 At the end of the intermediate housing part 3 facing away from the data logger there is an external thread 17 with the same dimensions as the external thread 8 'of the housing part 2.
- the intermediate housing part 3 has inflow openings 18 which have an elongated shape and whose longitudinal axis is parallel to the longitudinal axis of the cylindrical measuring device 1.
- the pressure measuring housing part 4 has at its upper end 20 an internal thread 21 which, when mounted on the intermediate housing part 3 with the external thread 17 of the intermediate housing part 3 and when mounting the pressure measuring housing 4 on the housing part 2 receiving the data logger 5, with the external thread winch 8 'of the housing part 2 is connected.
- the pressure measuring housing part 4 has an opening 22 on the underside through which the medium to be measured can come into contact with the pressure measuring region 7.
- the pressure measuring area 7 comprises in particular a pressure sensor 23, which is usually designed as a piezo element, which is arranged in a complete component 24 and is connected to a flange 26 in a liquid-tight manner via a joint 25, the flange 26 having two sealing seats 27 and 28 has, which are filled with O-rings.
- a pressure compensation line can be led to the pressure measuring area 4 together with the electrical lines on the other hand is connected to the air on the earth's surface.
- FIG. 6 illustrates how the pressure measurement area 7 is mounted in the pressure measurement housing part 4 and this is mounted directly on the housing part 2 surrounding the data logger 5.
- the internal thread 21 of the pressure measuring housing part 4 is screwed to the external thread 8 'of the housing part 2 receiving the data logger.
- the pressure measuring area 7 with its flange 26 is pressed into a sealing part 29 designed similarly to the sealing body 14 on the upper side of the measuring device 1, the tightness being ensured by O-rings inserted in sealing seats 27 and 28.
- the sealing part 29 is, on the one hand, sealed against the wall of the housing part 2 by O-rings also located in sealing seats 30 and 31.
- a spacer sleeve 32 is mounted on the inside in the housing part 2 and clamped on the one hand with the lower end of the data logger 5 and on the other hand with the sealing part 29, so that both the spacer sleeve 32 and the sealing part 29 and the pressure measuring area 7 have a tight fit in the respective housing part. It is of course also possible to support the sealing part 29 directly at the lower end of the data logger 5 and to reduce the overhang of the housing part 2.
- Such an arrangement shown in FIG. 6 represents a minimal measuring device, wherein a temperature sensor can additionally be mounted in the pressure measuring housing part 4. In addition, no further sensors can be attached in this arrangement, so that a pure level measuring device is available, with the corresponding price advantages and small housing dimensions.
- the pressure measuring housing part 4 is first unscrewed, then the pressure measuring area 7 with its flange 26 is pulled out of the press fit, the sealing part 29 and the spacer sleeve 32 are removed, so that an upper part Measuring device part, as shown in Fig. 2, is available for further inclusion of parts.
- a sensor unit 6 is now inserted on the underside of the housing part 2 and engages with its plug connections 33 in sockets provided on the data logger 5 and thereby ensures contacting of the sensor element 6.
- the pressure measurement area 4 is inserted into a receptacle 34 formed on the sensor element 6 by means of its flange 26, as shown in FIG. 7.
- the electrical contacting of the pressure measuring area 4 takes place via cables which are guided in a liquid-tight manner in a tube 35 of the sensor unit 6 and which can be separated for converting the device via an adapter plug (not shown).
- the sensor unit 6 inserted into the sockets at the lower end of the data logger 5 by means of a plug movement seals the housing part 2 to the data logger by means of two O-rings in the sealing seats 36 and 37.
- the sensor unit 6 is mounted independently of the intermediate housing part 3.
- the measuring device being converted in FIG. 7 is completely surrounded by the intermediate housing part 3 and the pressure measuring housing part 4 in FIG. 1.
- the sensor unit 6 is shown in detail in FIG. 8 and essentially comprises at least one body 38 which holds the sensors 39 in a liquid-tight manner and which in turn is fitted in the housing part 2 in a liquid-tight manner by means of its outer sealing seats 36 and 37.
- a spacer pin 40 Arranged on the body 38 is a spacer pin 40, which represents the stop when the sensor unit 6 is inserted into the underside of the data logger 5.
- the sensor unit 6 comprises a plurality of sensors 39 which are mounted side by side in the body 38 of the sensor unit 6, have essentially the same dimensions and are therefore all effective in one measuring plane. Even if two such bodies 38 form a sensor unit, they lie opposite each other, so that the measuring heads 41 of the sensors used are essentially in one measuring plane.
- the sensors 39 can each be replaced individually, which takes account of their different mounting and facilitates maintenance.
- the sensors 39 can be plugged in in any arrangement, and it is possible that individual sensor locations are not occupied, so that in each case only the required sensors 39 have to be used and further sensors that are not required for a specific measurement are not be unnecessarily exposed to aging.
- the individual sensors 39 have an essentially two-part construction, which makes it possible to separate the actual measuring electrode 42 from a sleeve 43 surrounding it in its neck area, so that the measuring electrode 42 can be replaced without, therefore, the must destroy the entire sensor.
- the sleeve 43 has in its neck area 44 windows 45 which allow access to the electrical connections of the measuring electrode 42 and which also serve to fill a sealing and holding paste into the space between the sleeve 43 and the measuring electrode 42 can, so that the measuring electrode 42 is kept liquid-tight and parallel in the sleeve 43.
- a lateral filler opening 45 ' can be provided in a supportive manner for better distribution of the sealing and holding paste.
- the windows 45 serve to be able to remove the sealing compound again and through the windows 45 the space between the measuring electrode 42 and To be able to pressurize sleeve 43 with a medium under pressure, thereby driving out the sealing paste and making sleeve 43 available for receiving a new measuring electrode 42.
- the sleeve 43 seals the sensor 39 against the body 38 of the sensor unit 6 by means of the O-rings mounted in the sealing seats 46 and 47, so that here too no liquid can reach the plug connections 33.
- sleeve 43 can be provided in the area of window 45 a memory chip can be arranged, which transmits both the type of sensor 39 and thus the parameter to be measured in each case to the data logger and also carries factory calibration data, which are transmitted to the data logger 5 before the start of a series of measurements and from this each measured value can be assigned as a correction factor. This eliminates the need for on-site calibration, and no changes - not even the software - need to be made on the data logger 5 when the plug 39 is changed or plugged in additionally.
- the data logger 5 can recognize a mutual influence of state variables of the system and correct incorrect measurements resulting therefrom. For example, a high nitrate content in the groundwater can change the density and thus the measured pressure. Since the data from the pressure measurement alone would indicate an incorrect water level, these are provided with a correction factor which is adapted to the high nitrate content.
- a data carrier 5 emits a carrier wave Modulation is evaluated as a measurement signal by the signals transmitted by the sensors 39.
- Both ion-selective electrodes 42 are available for the sensors 39, in particular for measuring the content of nitrations, oxygen ions, chloride ions, ammonium ions, calcium ions and further alkaline earth metal ions, which are provided at any time with additional electrodes 42. for measuring other ions can be added, as well as measuring cells for determining the redox potential, the electrical conductivity and the turbidity of the medium. There is also the possibility of arranging a light guide in the cable supplying the measuring device 1 and thus stimulating molecular vibrations or rotations by means of excitation light of defined energy and thus detecting the corresponding molecules.
- This method is intended in particular for the detection of hydrocarbons, especially polycyclic aromatic hydrocarbons (PAHs), which include, for example, benzenes, toluenes and xylenes, which occur, for example, in the area of the leachate of landfills and whose detection is of great importance .
- PAHs polycyclic aromatic hydrocarbons
- the measuring device 1 Since the measuring device 1 is to be used not only in groundwater, spring water or flowing water, but also in leachate areas of landfills, that is to say in very aggressive media, it is necessary to very completely stable against corrosion.
- the variability of the measuring device 1 is not limited solely to a different number and arrangement of sensors 39, but that the measuring programs can also be selected as desired, e.g. the query times and gaps between the measurements. These can be set individually for each sensor 39 by external programming of the data logger 5 as required.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19610167A DE19610167C1 (de) | 1996-03-15 | 1996-03-15 | Meßgerät zur Ermittlung von Zustandsgrößen eines flüssigen Mediums |
DE19610167 | 1996-03-15 | ||
PCT/EP1997/001307 WO1997035190A1 (de) | 1996-03-15 | 1997-03-14 | Messgerät zur ermittlung von zustandsgrössen eines flüssigen mediums |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0886777A1 true EP0886777A1 (de) | 1998-12-30 |
Family
ID=7788357
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97914247A Ceased EP0886777A1 (de) | 1996-03-15 | 1997-03-14 | Messgerät zur ermittlung von zustandsgrössen eines flüssigen mediums |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0886777A1 (de) |
CN (1) | CN1144043C (de) |
DE (1) | DE19610167C1 (de) |
WO (1) | WO1997035190A1 (de) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19747059A1 (de) * | 1997-10-24 | 1999-05-12 | Weber Erika | Meßvorrichtung für Abwasser |
GR1003394B (el) * | 1999-05-21 | 2000-06-15 | Αυτοματοποιημενο συστημα ελεγχου υπογειων υδατων για την ορθολογικη διαχειριση υδατινων πορων | |
US6393925B1 (en) | 1999-05-26 | 2002-05-28 | University Of Waterloo | Groundwater velocity probe |
DE10055090A1 (de) | 2000-11-07 | 2002-05-08 | Conducta Endress & Hauser | Steckverbinder zum Anschluss einer Übertragungsleitung an mindestens einen Sensor |
GB2375398A (en) * | 2001-05-11 | 2002-11-13 | Local Link Internat Ltd | Piezometric pressure sensor |
DE10163165A1 (de) * | 2001-12-20 | 2003-07-03 | Endress & Hauser Gmbh & Co Kg | Feldgerät und Verfahren zum Betrieb des Feldgerätes |
DE10212903B4 (de) | 2002-03-22 | 2007-02-01 | Vega Grieshaber Kg | Messwertaufnehmer |
DE10221303A1 (de) * | 2002-05-14 | 2003-11-27 | Valeo Schalter & Sensoren Gmbh | Sensor, insbesondere Ultraschallsensor, und Verfahren zur Herstellung |
US7104116B2 (en) * | 2003-09-25 | 2006-09-12 | Rockwell Automation Technologies, Inc. | Fluid sensor fixture for dynamic fluid testing |
DE202005003264U1 (de) * | 2005-02-25 | 2005-06-23 | Gneuß Kunststofftechnik GmbH | Messsystem mit einem Sensor und einem diesem zugeordneten Messverstärker |
DE102006062184A1 (de) * | 2006-12-22 | 2008-06-26 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Steckverbinderkupplung für ein Sensormodul und Sensormodul mit einer solchen Steckverbinderkupplung |
DE102008029956A1 (de) | 2008-06-26 | 2009-12-31 | Endress + Hauser Flowtec Ag | Meßsystem mit einem Sensormodul und einem Transmittermodul |
DE102008043169A1 (de) * | 2008-10-24 | 2010-04-29 | Endress + Hauser Gmbh + Co. Kg | Messvorrichtung und Verfahren zur Herstellung der Messvorrichtung |
DE102008053920A1 (de) | 2008-10-30 | 2010-05-06 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Verteilermodul bzw. damit gebildetes Messsystem |
DE102012012527B4 (de) | 2012-06-26 | 2015-05-21 | Krohne Analytics Gmbh | Messvorrichtung zum Bestimmen einer Prozessgröße |
DE102014202354A1 (de) * | 2014-02-10 | 2015-08-13 | Zf Friedrichshafen Ag | Dichtvorrichtung für ein Sensorgehäuse |
DE102015011974A1 (de) | 2015-09-12 | 2017-03-16 | Hydac Electronic Gmbh | Sensoreinrichtung, insbesondere für maritime Anwendungen |
DK3391038T3 (da) | 2015-12-18 | 2022-04-19 | Radiometer Medical Aps | Fremgangsmåde til drift af en ionselektiv elektrode med blandede ionoforer til forbedret detektering af urinstof i blod |
DE102016210519B4 (de) | 2016-06-14 | 2020-09-10 | Robert Bosch Gmbh | Sensoranordnung und Verfahren zur Herstellung einer Sensoranordnung |
DE102016008518A1 (de) * | 2016-07-15 | 2018-01-18 | Testo SE & Co. KGaA | Datenlogger und Verwendung von zwei metallischen Wandbereichen eines Gehäuses eines Datenloggers |
DE102018111790A1 (de) * | 2018-05-16 | 2019-11-21 | Anton Paar Provetec Gmbh | Stopfen für Automatische Destillationsmessungen |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2015851A (en) * | 1933-03-06 | 1935-10-01 | Standard Oil Co California | Pressure and temperature recorder |
AT353505B (de) * | 1974-10-10 | 1979-11-26 | Oemv Ag | Messanordnung fuer bohrloecher |
IT1121122B (it) * | 1979-01-08 | 1986-03-26 | Cise Spa | Circuito elettrico e struttura per sonde di pressione e temperatura dotato di accorgimenti adatti per la correzione dell errore di temperatura sul segnale di pressione e per eliminare l influenza della resistenza elettrica dei conduttori del cavo |
DE8026460U1 (de) * | 1980-10-03 | 1981-01-22 | Hans Woehlermaschinen- U. Apparatebau, 4791 Wuennenberg | Kombinationssonde fuer abgasmessungen an gas- und oelheizungen |
US4854728A (en) * | 1987-05-18 | 1989-08-08 | Sippican Ocean Systems, Inc. | Seawater probe |
DE4121397C2 (de) * | 1991-06-28 | 1997-03-20 | Bosch Gmbh Robert | Einrichtung zur Erfassung von Wasserzustandsdaten |
US5283767A (en) * | 1992-02-27 | 1994-02-01 | Mccoy Kim | Autonomous oceanographic profiler |
DE4337402A1 (de) * | 1993-10-26 | 1995-04-27 | Mannesmann Ag | Sonde zur Messung von Druck- und Temperaturprofilen |
DE9404359U1 (de) * | 1994-03-15 | 1994-05-19 | Sum Mestechnik Gmbh | Meßvorrichtung mit absenkbarer Meßsonde |
DE9404367U1 (de) * | 1994-03-15 | 1994-05-19 | Sum Mestechnik Gmbh | Meßsonde |
DE4438523C1 (de) * | 1994-10-31 | 1995-12-07 | Schott Geraete | Multifunktions-Sensor |
-
1996
- 1996-03-15 DE DE19610167A patent/DE19610167C1/de not_active Expired - Fee Related
-
1997
- 1997-03-14 EP EP97914247A patent/EP0886777A1/de not_active Ceased
- 1997-03-14 WO PCT/EP1997/001307 patent/WO1997035190A1/de not_active Application Discontinuation
- 1997-03-14 CN CNB971937737A patent/CN1144043C/zh not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9735190A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19610167C1 (de) | 1997-02-13 |
WO1997035190A1 (de) | 1997-09-25 |
CN1216111A (zh) | 1999-05-05 |
CN1144043C (zh) | 2004-03-31 |
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