EP3234522A1 - Appareil de laboratoire - Google Patents

Appareil de laboratoire

Info

Publication number
EP3234522A1
EP3234522A1 EP15817795.6A EP15817795A EP3234522A1 EP 3234522 A1 EP3234522 A1 EP 3234522A1 EP 15817795 A EP15817795 A EP 15817795A EP 3234522 A1 EP3234522 A1 EP 3234522A1
Authority
EP
European Patent Office
Prior art keywords
weight
temperature
heating
medium
container
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Withdrawn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
EP15817795.6A
Other languages
German (de)
English (en)
Inventor
Walter Lohmann
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.)
Hans Heidolph GmbH and Co KG
Original Assignee
Hans Heidolph GmbH and Co KG
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 Hans Heidolph GmbH and Co KG filed Critical Hans Heidolph GmbH and Co KG
Publication of EP3234522A1 publication Critical patent/EP3234522A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/22—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for apportioning materials by weighing prior to mixing them
    • G01G19/24—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for apportioning materials by weighing prior to mixing them using a single weighing apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/45—Magnetic mixers; Mixers with magnetically driven stirrers
    • B01F33/452—Magnetic mixers; Mixers with magnetically driven stirrers using independent floating stirring elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/211—Measuring of the operational parameters
    • B01F35/2115—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/211—Measuring of the operational parameters
    • B01F35/2117—Weight
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
    • B01F35/2215—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F35/92—Heating or cooling systems for heating the outside of the receptacle, e.g. heated jackets or burners
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G17/00—Apparatus for or methods of weighing material of special form or property
    • G01G17/04—Apparatus for or methods of weighing material of special form or property for weighing fluids, e.g. gases, pastes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F2035/99—Heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/23—Mixing of laboratory samples e.g. in preparation of analysing or testing properties of materials

Definitions

  • the invention relates to a laboratory apparatus, in particular a magnetic stirrer, with a heating unit for heating a medium contained in a container, in particular a liquid, and with a control unit which is adapted to control the heating power of the heating unit, the temperature of the medium, the heating unit and / or container.
  • Such laboratory devices are basically known.
  • magnetic stirrers may be equipped with a heating plate to simultaneously heat a medium during mixing, for example to a temperature of up to 300 ° C.
  • the mixing speeds may be, for example, 30 to 1400 rpm.
  • a container can be mounted with a medium.
  • the container in particular a beaker or an Erlenmeyer flask, can be of essentially any size and, for example, have a capacity of 50 ml, 100 ml, 250 ml, 500 ml, 750 ml, 1 l, 5 l, 10 l or 20 l.
  • the laboratory device can also be, for example, a rotary evaporator or large rotary evaporator.
  • the piston size of an associated evaporating flask may in this case be, for example, up to 5 l or up to 20 l.
  • the regulation of the temperature is based on temperature data, which are determined by at least one temperature sensor.
  • temperature data are determined by at least one temperature sensor.
  • two temperature sensors can be provided in the medium and / or two temperature sensors in the heating plate.
  • a temperature sensor is used here as a rule sensor, while the additional sensor acts as a redundant plausibility sensor.
  • the heating unit in order to determine whether there is a large or small volume of medium in the container and thus, in principle, a higher or lower heating power is required, the heating unit is initially operated at full power, e.g. at 800 watts. In this case, the temperature rise of the liquid within a certain period of time, e.g. 10 seconds, to be determined. Since in principle the temperature increase is greater, the less medium there is in the container, it can be estimated from the temperature rise or the temperature gradient, which volume of the medium is in the container. The thus estimated volume can then be incorporated as a parameter in the heating power or temperature control. In particular, a smaller volume must be heated less than a larger volume to reach the same temperature over the same time period.
  • the determination of the volume of the medium based on the temperature rise or the temperature gradient is relatively inaccurate, so that it may happen that the heating power is set so that either too little or too much heating, and accordingly either the heating takes too long or Temperature overshoot occur.
  • a weight determination unit for determining the weight of the medium, wherein the regulation of the temperature, in particular special by controlling the heating power of the heating unit, depending on the specific weight.
  • the container is, as is apparent from the wording of independent claim 1, not mandatory part of the claimed laboratory equipment.
  • the laboratory device may also include a container.
  • protection is also claimed for a system comprising a laboratory apparatus according to the invention and a container for holding a liquid which can be heated by the heating unit of the laboratory apparatus, in particular for the case that the container has a temperature sensor in order to regulate the temperature of the container.
  • the weight of a medium can be determined and used as a parameter for the heating power or for controlling the temperature. This is much more accurate than volume determination by means of a temperature rise caused by a defined heat pulse at the beginning of the heating process, as known in the art.
  • the weight data can be included in the regulation of the temperature without being visually displayed.
  • an optical indication of the weight is conceivable for a user.
  • the controlled temperature may be the temperature of the medium, the temperature of the heating unit or the temperature of the container, i. the temperature of the medium can be controlled both directly and indirectly by controlling the temperature of the heating unit or tank.
  • the container can be weighed without medium.
  • the weight determination unit can be calibrated or calibrated. For example, either an empty container on the Schuvorrich- tion and then filled with a medium or it can be placed directly on the heater with a medium filled container. Then the weight of the medium is determined. If a high weight is present, it must be heated correspondingly to a lower weight.
  • the control unit controls, inter alia, based on the weight data obtained, the heating power of the heating unit.
  • the control of the heating unit can be carried out in particular via pulse width modulation or be designed as an analog control.
  • the heating unit may be designed in particular as a resistance heater.
  • the heating unit may comprise a heating plate on which the container is placed.
  • the weight can for example be determined once at the beginning of a mixing and / or heating process. This is sufficient in particular if the weight remains substantially constant during the mixing or heating process. However, if evaporation and thus changes in the weight of the medium may occur, the weight may also be continuous, i. continuously or at certain time intervals. The newly determined weight data can be reported to the control unit in order to adjust the heating power accordingly using these parameters. Such an approach may also be useful if medium is refilled.
  • the weight determination unit comprises a weighing cell, in particular a spring body provided with strain gauges.
  • the weight-determining unit in particular the weighing cell, is arranged between the heating unit designed in particular as a heating plate and a device body of the laboratory appliance. Feet can be attached to the device body, for example to position the laboratory device on a laboratory bench.
  • the device body may in particular comprise the control unit.
  • the laboratory device according to the invention and / or a system comprising the laboratory device according to the invention comprises at least one temperature sensor for determining the temperature of the heating unit, the container and / or the medium.
  • the at least one temperature sensor can be integrated in the heating unit, integrated in the container and / or immersed in the medium.
  • the at least one temperature sensor is preferably part of the laboratory device.
  • the at least one temperature sensor is preferably part of the laboratory device or of a system which comprises the laboratory device according to the invention and the container.
  • the at least one temperature sensor is preferably part of a system comprising the laboratory device according to the invention and the at least one temperature sensor.
  • at least two temperature sensors can be provided, in particular a control sensor and a redundant plausibility sensor. Errors in the temperature measurement can be easily detected in this way.
  • a temperature sensor is integrated in the heating unit, for example, a respective threaded bore can be provided in the heating unit, in which the temperature sensor can be introduced.
  • the laboratory device is designed such that the weight of the medium at the beginning of the temperature control, in particular before the start of the temperature control determined and the heating power, in particular at least the initial heating power, in dependence on the determined at the beginning of the temperature control weight.
  • a single weight determination only at the beginning of the temperature control can be provided in particular if the weight of the medium does not change during the mixing or heating process. Alternatively, the weight may be continuously determined and reported to the control unit to adjust the heating power as the weight changes.
  • control unit is designed such that the heating power of the heating unit is controlled such that an increase in temperature of the heating unit and / or the container per unit time does not exceed a predetermined, maximum allowable value.
  • a certain temperature gradient must not be exceeded in this case during heating therefore.
  • the laboratory device in particular for protection against overheating of the heating unit and / or the container, switches off the heating unit if a set limit value of the temperature is exceeded.
  • the invention also relates to a method for operating a laboratory apparatus, in particular a magnetic stirrer, in which a medium, in particular a liquid, contained in a container is heated by means of a heating unit, and the temperature of the medium by means of a control unit by controlling the heating power of the heating unit.
  • the heating unit and / or the container is regulated.
  • the weight of the medium is determined, the temperature depending on the determined weight. is valid.
  • the weight of the medium in the container is thus preferably first determined and the heat output of the heating unit is regulated as a function of this parameter.
  • the temperature of the heating unit, the container and / or the medium is determined by means of at least one temperature sensor, which is integrated in particular in the heating unit, integrated in the container and / or immersed in the medium.
  • the weight of the medium is determined at the beginning of the temperature control and the heating power is set as a function of the weight determined at the beginning of the temperature control.
  • the weight data can, as already mentioned above, also be continuously determined and communicated to the control unit.
  • the laboratory device may be designed such that the weight of the medium is continuously determined and the heating power is adjusted accordingly with a change in weight.
  • the heating power of the heating unit is controlled such that a temperature increase of the heating unit and / or the container per unit time does not exceed a predetermined, maximum allowable value.
  • Fig. 1 is a schematic representation of an embodiment of a laboratory device according to the invention including container.
  • the illustrated embodiment is merely exemplary in nature.
  • the number and the position of the temperature sensor shown can vary as desired.
  • Fig. 1 shows a magnetic stirrer with heating function, i. a Schurrounder, with a device body 10 and a heating plate 12.
  • a container 18 is arranged, which is filled with a means of the heating plate 12 to be heated liquid 20.
  • the liquid 20 is an unillustrated Magnetetrrock- rods, which is placed in a known manner by a not shown, arranged in the device body 10, rotating magnet in a rotating, the liquid 20 mixing movement.
  • a temperature sensor 22 is provided, which dips into the liquid 20 in order to determine the temperature of the liquid 20 continuously.
  • the determined temperature is fed back to a control unit 16 arranged in the device body 10, which controls the heating power of the heating plate 12.
  • the liquid 20 is first brought to a predetermined temperature and then kept at the predetermined temperature.
  • a second temperature sensor 22 ' is provided, which is integrated in the heating plate 12.
  • the temperature of the heating plate 12 which is reported to the control unit 16, are monitored.
  • a predetermined temperature threshold is exceeded, the Hot plate 12 is turned off by the control unit 16 or the heating power can be reduced accordingly to prevent overheating and thus a possible damage to the heating plate 12.
  • the first temperature sensor 22 can then be omitted.
  • a weight determining unit 14 is provided, which is arranged between the heating plate 12 and the device body 10 to determine the weight of the liquid 20 at the beginning of the temperature control.
  • the weight determination unit 14 may be a load cell.
  • the weight of the liquid 20 is passed to the control unit 16.
  • the determined weight can then be used as a parameter in the regulation of the temperature of the liquid 20. This is advantageous because more energy is required to heat a larger amount of liquid than to heat a small amount of liquid. Accordingly, the higher the weight of the liquid 20, the higher the heating power can be chosen.
  • the weight of the container 18 alone and on the other hand determines the common weight of the container 18 and the liquid 20 and from the difference of these two weights, the weight of the liquid 20 can be determined.
  • the weight of the container 18 may also be known to the magnetic stirrer or manually entered into the magnetic stirrer, so that a separate weight determination for the container 18 is not required.
  • the weight of the liquid 20 can be determined once at the beginning of the temperature control, as explained above. Alternatively, however, it is also possible to determine the weight continuously, in particular if a portion of the liquid 20 is evaporated or liquid is replenished. In this case, the Heating power depending on the changing weight data readjusted or adjusted accordingly.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Accessories For Mixers (AREA)

Abstract

L'invention concerne un appareil de laboratoire, en particulier un agitateur magnétique, comprenant une unité de chauffage pour chauffer un fluide, en particulier un liquide, se trouvant dans un récipient, ainsi qu'une unité de régulation conçue pour réguler la température du fluide, de l'unité de chauffage et/ou du récipient par commande de la puissance de chauffage de l'unité de chauffage. L'invention est caractérisée par une unité de détermination de poids servant à déterminer le poids du fluide, la température étant régulée en fonction du poids déterminé.
EP15817795.6A 2014-12-17 2015-12-16 Appareil de laboratoire Withdrawn EP3234522A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014118852.7A DE102014118852A1 (de) 2014-12-17 2014-12-17 Laborgerät
PCT/EP2015/080037 WO2016097009A1 (fr) 2014-12-17 2015-12-16 Appareil de laboratoire

Publications (1)

Publication Number Publication Date
EP3234522A1 true EP3234522A1 (fr) 2017-10-25

Family

ID=55066584

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15817795.6A Withdrawn EP3234522A1 (fr) 2014-12-17 2015-12-16 Appareil de laboratoire

Country Status (6)

Country Link
US (1) US20180117553A1 (fr)
EP (1) EP3234522A1 (fr)
KR (1) KR20170102268A (fr)
CN (1) CN107249725A (fr)
DE (1) DE102014118852A1 (fr)
WO (1) WO2016097009A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016120667A1 (de) * 2016-10-28 2018-05-03 Hans Heidolph GmbH Laborgerät, insbesondere Magnetrührer
US11698286B2 (en) * 2017-04-01 2023-07-11 Koninklijke Philips N.V. Sensing and control device and method for a weight measurement device
CN107797491A (zh) * 2017-10-25 2018-03-13 广东葵树生物科技股份有限公司 一种实验室加热台
WO2019176143A1 (fr) * 2018-03-14 2019-09-19 株式会社島津製作所 Appareil de séparation de fluide supercritique
CN109998318B (zh) * 2019-04-12 2021-07-16 宁波梦神床垫机械有限公司 一种识别人体的智能温控床垫及其使用方法
US20210353090A1 (en) * 2020-05-16 2021-11-18 John McDevitt System and method for a process to provide improved preparation of consumables

Citations (2)

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Publication number Priority date Publication date Assignee Title
EP0494492A2 (fr) * 1991-01-08 1992-07-15 Ta Instruments, Inc. Procédé et dispositif pour l'analyse à haute résolution de la composition de matériaux
WO2009156020A1 (fr) * 2008-06-24 2009-12-30 Ika -Werke Gmbh & Co. Kg Agitateur magnétique avec pieds de montage

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JPS6349404U (fr) * 1986-09-16 1988-04-04
CN1007407B (zh) * 1986-11-17 1990-04-04 石恭芬 液体恒温电磁搅拌器
US6444927B1 (en) * 2001-08-13 2002-09-03 David Michael Korpi Microbalance with reduced temperature and / or pressure sensitivity
DE10353299B4 (de) * 2003-11-11 2008-03-20 E.G.O. Elektro-Gerätebau GmbH Verfahren zur Regelung einer Heizeinrichtung zur Nahrungsmittelzubereitung und geeignete Vorrichtung
CN101940433B (zh) * 2010-02-22 2012-10-17 谢国华 一种具有称重功能的电加热锅及其称重控制方法
CN202181234U (zh) * 2011-07-29 2012-04-04 湖北中烟工业有限责任公司 实验室化学废液全自动处理器
DE102012008612A1 (de) * 2012-04-27 2013-10-31 Ika-Werke Gmbh & Co. Kg Temperaturmessvorrichtung
DE102013010203B4 (de) * 2013-06-15 2022-06-30 Ika-Werke Gmbh & Co. Kg Labor-Stativ mit wenigstens einer Haltestange und einer diese tragenden Bodenabstützung mit Aufstellfüßen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0494492A2 (fr) * 1991-01-08 1992-07-15 Ta Instruments, Inc. Procédé et dispositif pour l'analyse à haute résolution de la composition de matériaux
WO2009156020A1 (fr) * 2008-06-24 2009-12-30 Ika -Werke Gmbh & Co. Kg Agitateur magnétique avec pieds de montage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2016097009A1 *

Also Published As

Publication number Publication date
KR20170102268A (ko) 2017-09-08
US20180117553A1 (en) 2018-05-03
WO2016097009A1 (fr) 2016-06-23
CN107249725A (zh) 2017-10-13
DE102014118852A1 (de) 2016-06-23

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