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US20040216862A1 - Laboratory thermostat - Google Patents

Laboratory thermostat Download PDF

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Publication number
US20040216862A1
US20040216862A1 US10/818,245 US81824504A US2004216862A1 US 20040216862 A1 US20040216862 A1 US 20040216862A1 US 81824504 A US81824504 A US 81824504A US 2004216862 A1 US2004216862 A1 US 2004216862A1
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US
United States
Prior art keywords
laboratory thermostat
liquid
warning
laboratory
temperature control
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.)
Abandoned
Application number
US10/818,245
Inventor
Gerhard Jucheim
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.)
Julabo Labortechnik GmbH
Original Assignee
Julabo Labortechnik GmbH
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 Julabo Labortechnik GmbH filed Critical Julabo Labortechnik GmbH
Assigned to JULABO LABORTECHNIK GMBH reassignment JULABO LABORTECHNIK GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JUCHEIM, GERHARD
Publication of US20040216862A1 publication Critical patent/US20040216862A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L7/00—Heating or cooling apparatus; Heat insulating devices
    • B01L7/02—Water baths; Sand baths; Air baths
    • 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
    • G01F23/30—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 floats
    • G01F23/32—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 floats using rotatable arms or other pivotable transmission elements
    • G01F23/36—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 floats using rotatable arms or other pivotable transmission elements using electrically actuated indicating means
    • G01F23/363—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 floats using rotatable arms or other pivotable transmission elements using electrically actuated indicating means using electromechanically actuated indicating means
    • 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
    • G01F23/30—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 floats
    • G01F23/56—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 floats using elements rigidly fixed to, and rectilinearly moving with, the floats as transmission elements
    • G01F23/60—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 floats using elements rigidly fixed to, and rectilinearly moving with, the floats as transmission elements using electrically actuated indicating means
    • 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
    • G01F23/30—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 floats
    • G01F23/56—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 floats using elements rigidly fixed to, and rectilinearly moving with, the floats as transmission elements
    • G01F23/60—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 floats using elements rigidly fixed to, and rectilinearly moving with, the floats as transmission elements using electrically actuated indicating means
    • G01F23/603—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 floats using elements rigidly fixed to, and rectilinearly moving with, the floats as transmission elements using electrically actuated indicating means using electromechanically actuated indicating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
    • B01L2200/14—Process control and prevention of errors

Definitions

  • the invention relates to a laboratory thermostat with a heating and/or cooling device for controlling the temperature of a liquid bath medium located in a bath tank.
  • Laboratory thermostats are used for high-precision temperature control and maintaining of an adjustable temperature value.
  • the main functional elements are the heater, circulating pump, and control electronics.
  • a bath tank is used to store the temperature-control liquid. Water, bath oil for higher temperatures, or alcoholic fluids for negative temperatures are used as the temperature-control medium.
  • Laboratory thermostats can be used both for internal temperature-control tasks in bath tanks and also for external temperature control of a load with the help of an integrated circulating pump.
  • the main application in science and research and also in many fields of industry is temperature control of external measurement and analysis system instruments, reaction systems, and measurement cells in a temperature-control cycle.
  • the object of the present invention is to create a laboratory thermostat of the type mentioned above, which can prevent problems due to premature, undesired shutdown of the laboratory thermostat by means of the low-liquid-level protection device.
  • the laboratory thermostat has an early-warning system with a controller for low liquid level in the bath tank, and that for maintaining the temperature-control process, an evaluation device is provided at least for an acoustic and/or visual warning message.
  • FIG. 1 is a side view of a laboratory thermostat with early-warning system with certain areas cut away
  • FIG. 3 is a rear view of the laboratory thermostat shown in FIGS. 1 and 2.
  • a laboratory thermostat shown in the figures has control/safety electronics 5 with a controller for a low liquid level in the bath tank and also an evaluation device at least for a visual and/or acoustic warning message.
  • a temperature sensor 6 a heater 7 , an immersion pump 8 with external pump attachments 9 , and a float 10 with electrical switching element 11 are preferably provided. These elements can be used to trigger a shutdown function, especially a safety shutdown.
  • the novel early-warning system has another switching element 12 .
  • the control/safety electronics 5 include a signal buzzer 13 for a pulsed acoustic signal release. These electronics are electrically connected to the switching element 12 and the switching element 11 , which triggers a shutdown function with continuous signal tone.
  • the early-warning system is integrated in the heating/cooling thermostats (FIG. 2) and also in circulating coolers with a circularly arranged keypad 14 , a VFD info display 15 , a network switch 16 , an adjustable high temperature protection device 17 , and a visual display of warning and safety functions 18 .

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Clinical Laboratory Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Control Of Temperature (AREA)
  • Automatic Analysis And Handling Materials Therefor (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Control Of Non-Electrical Variables (AREA)

Abstract

A laboratory thermostat features a heating and/or cooling device for temperature control of a liquid bath medium located in a bath tank. The laboratory thermostat has an early-warning system with a control device for a low liquid level in the bath tank and an evaluation device that can realize at least an acoustic and/or visual warning message for maintaining the temperature control process. Due to the integrated early-warning system, when the liquid level decreases, the user of the laboratory thermostat is made aware in due time before undesired shutdown by a low-liquid-level protection device, so that lost temperature control fluid can be immediately refilled before the safety shutdown is triggered by the low-liquid-level protection device.

Description

  • The invention relates to a laboratory thermostat with a heating and/or cooling device for controlling the temperature of a liquid bath medium located in a bath tank. [0001]
  • Laboratory thermostats are used for high-precision temperature control and maintaining of an adjustable temperature value. The main functional elements are the heater, circulating pump, and control electronics. A bath tank is used to store the temperature-control liquid. Water, bath oil for higher temperatures, or alcoholic fluids for negative temperatures are used as the temperature-control medium. [0002]
  • Laboratory thermostats can be used both for internal temperature-control tasks in bath tanks and also for external temperature control of a load with the help of an integrated circulating pump. Here, the main application in science and research and also in many fields of industry is temperature control of external measurement and analysis system instruments, reaction systems, and measurement cells in a temperature-control cycle. [0003]
  • Here, there can be fluid losses due to evaporation of the used bath medium or due to breaks in seals in the external circuit. [0004]
  • If there is a low-liquid-level protection device, these losses would definitely lead to shutdown of the system. [0005]
  • However, the shutdown of the system can create problems in the treatment. For example, for an internal temperature control of bacteria cultures in a bath tank, there is the risk that these bacteria cultures are irrevocably destroyed by a sudden shutdown of the temperature control process. Furthermore, for external processes, the interruption of the temperature control can have the effect that the entire process must be repeated with corresponding expense. [0006]
    • SUMMARY
  • The object of the present invention is to create a laboratory thermostat of the type mentioned above, which can prevent problems due to premature, undesired shutdown of the laboratory thermostat by means of the low-liquid-level protection device. [0007]
  • To achieve this object in accordance with the invention, the laboratory thermostat has an early-warning system with a controller for low liquid level in the bath tank, and that for maintaining the temperature-control process, an evaluation device is provided at least for an acoustic and/or visual warning message. [0008]
  • Due to the integrated early-warning system, when the fluid level decreases, the user of the laboratory thermostat is made aware in due time before the undesired shutdown by a low-liquid-level protection device, so that the lost temperature-control fluid can be immediately refilled before the safety shutdown is triggered by the low-liquid-level protection device. [0009]
  • Additional configurations of the invention are noted below.[0010]
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • In the following, the invention is explained in more detail with reference to the drawings with their essential details. [0011]
  • In the drawings: [0012]
  • FIG. 1 is a side view of a laboratory thermostat with early-warning system with certain areas cut away, [0013]
  • FIG. 2 is a front view thereof, and [0014]
  • FIG. 3 is a rear view of the laboratory thermostat shown in FIGS. 1 and 2. [0015]
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • A laboratory thermostat shown in the figures has control/[0016] safety electronics 5 with a controller for a low liquid level in the bath tank and also an evaluation device at least for a visual and/or acoustic warning message.
  • Furthermore, a [0017] temperature sensor 6, a heater 7, an immersion pump 8 with external pump attachments 9, and a float 10 with electrical switching element 11 are preferably provided. These elements can be used to trigger a shutdown function, especially a safety shutdown.
  • The novel early-warning system has another [0018] switching element 12. The control/safety electronics 5 include a signal buzzer 13 for a pulsed acoustic signal release. These electronics are electrically connected to the switching element 12 and the switching element 11, which triggers a shutdown function with continuous signal tone.
  • The early-warning system is integrated in the heating/cooling thermostats (FIG. 2) and also in circulating coolers with a circularly arranged [0019] keypad 14, a VFD info display 15, a network switch 16, an adjustable high temperature protection device 17, and a visual display of warning and safety functions 18.
  • On the rear side (FIG. 3), there are connections for a Pt100 external sensor [0020] 19, a refrigeration control 20, and an interface 21, over which an early warning function can be transmitted to the outside.

Claims (6)

1. Laboratory thermostat with a heating and/or cooling device for temperature control of a liquid bath medium located in a bath tank, comprising an early-warning system with a controller for a low liquid level in the bath tank, and for maintaining a temperature control process, an evaluation device that provides at least one of an acoustic and a visual warning message.
2. Laboratory thermostat according to claim 1, wherein a response threshold of the early-warning system lies above a response threshold of a low-liquid-level protection device.
3. Laboratory thermostat according to claim 1, wherein the control device has a float (10) connected to an electrical switching element (12) and the electrical switching element (12) is connected electrically to an acoustic warning element for generating the acoustic warning.
4. Laboratory thermostat according to claim 1, wherein a pulsed warning message is provided through at least one of an acoustic warning element and a control lamp (18).
5. Laboratory thermostat according to claim 1, wherein an interface (21) is provided with a connectable cable for remote, external monitoring of the warning function.
6. Laboratory thermostat according to claim 1, wherein a circularly arranged keypad (14) and VFD info display (15) are provided.
US10/818,245 2003-04-16 2004-04-05 Laboratory thermostat Abandoned US20040216862A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20306059.8 2003-04-16
DE20306059U DE20306059U1 (en) 2003-04-16 2003-04-16 laboratory thermostat

Publications (1)

Publication Number Publication Date
US20040216862A1 true US20040216862A1 (en) 2004-11-04

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US10/818,245 Abandoned US20040216862A1 (en) 2003-04-16 2004-04-05 Laboratory thermostat

Country Status (4)

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US (1) US20040216862A1 (en)
CN (1) CN100345636C (en)
DE (1) DE20306059U1 (en)
GB (1) GB2400665B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120012208A1 (en) * 2010-07-15 2012-01-19 Preston Industries, Inc. Movable constant temperature circulator assembly
EP2354738A3 (en) * 2010-02-03 2012-05-30 Preston Industries, Inc. Constant temperature circulator
EP2594335A3 (en) * 2011-10-28 2013-06-05 Thermo Neslab Inc. Circulating liquid bath with reservoir dual level switch
US20150144300A1 (en) * 2013-11-22 2015-05-28 Thermo Fisher Scientific (Asheville) Llc Recirculating Bath With Global Voltage Compatibility
CN105115186A (en) * 2015-09-15 2015-12-02 江苏天舒电器有限公司 Cold and heat balance device of heat pump water heater test room
CN109361533A (en) * 2018-09-17 2019-02-19 视联动力信息技术股份有限公司 Heatproof test method and device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019133584A1 (en) * 2019-12-09 2021-06-10 Friedhelm Selbach Gmbh Cooling device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992941A (en) * 1974-06-10 1976-11-23 Mcgoldrick Daniel J Liquid level measuring apparatus
US5111188A (en) * 1989-10-05 1992-05-05 Harry E. Turloff Electronic fluid-level sensor with three state indicator
US5283569A (en) * 1989-12-15 1994-02-01 U.S. Army Corps Of Engineers Float actuated flood warning system with remote telephone reporting
US6218949B1 (en) * 1997-12-16 2001-04-17 David Issachar Liquid level monitoring and control apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB953122A (en) * 1961-02-06 1964-03-25 Denis Compton Luckham Improvements in or relating to water baths
CN2079320U (en) * 1990-11-27 1991-06-19 北京光电设备厂 High precision controller constant temp.
DE29723390U1 (en) * 1997-05-02 1998-09-03 Lauda Dr. R. Wobser GmbH & Co. KG, 97922 Lauda-Königshofen Level monitoring device in a heated bath vessel, especially a laboratory thermostat
JP3101941B2 (en) * 1998-04-10 2000-10-23 坂口電熱株式会社 Liquid heating heater

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992941A (en) * 1974-06-10 1976-11-23 Mcgoldrick Daniel J Liquid level measuring apparatus
US5111188A (en) * 1989-10-05 1992-05-05 Harry E. Turloff Electronic fluid-level sensor with three state indicator
US5283569A (en) * 1989-12-15 1994-02-01 U.S. Army Corps Of Engineers Float actuated flood warning system with remote telephone reporting
US6218949B1 (en) * 1997-12-16 2001-04-17 David Issachar Liquid level monitoring and control apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2354738A3 (en) * 2010-02-03 2012-05-30 Preston Industries, Inc. Constant temperature circulator
US20120012208A1 (en) * 2010-07-15 2012-01-19 Preston Industries, Inc. Movable constant temperature circulator assembly
US8616268B2 (en) * 2010-07-15 2013-12-31 Preston Industries, Inc. Movable constant temperature circulator assembly
EP2594335A3 (en) * 2011-10-28 2013-06-05 Thermo Neslab Inc. Circulating liquid bath with reservoir dual level switch
US10532359B2 (en) 2011-10-28 2020-01-14 Thermo Neslab Llc Circulating liquid bath with dual reservoir level switch
US20150144300A1 (en) * 2013-11-22 2015-05-28 Thermo Fisher Scientific (Asheville) Llc Recirculating Bath With Global Voltage Compatibility
EP2884365A3 (en) * 2013-11-22 2015-09-02 Thermo Fisher Scientific (Asheville) LLC Recirculating bath with global voltage compatibility
CN105115186A (en) * 2015-09-15 2015-12-02 江苏天舒电器有限公司 Cold and heat balance device of heat pump water heater test room
CN109361533A (en) * 2018-09-17 2019-02-19 视联动力信息技术股份有限公司 Heatproof test method and device

Also Published As

Publication number Publication date
CN1539554A (en) 2004-10-27
GB0408531D0 (en) 2004-05-19
GB2400665A (en) 2004-10-20
DE20306059U1 (en) 2003-06-18
CN100345636C (en) 2007-10-31
GB2400665B (en) 2006-09-13

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Legal Events

Date Code Title Description
AS Assignment

Owner name: JULABO LABORTECHNIK GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:JUCHEIM, GERHARD;REEL/FRAME:015187/0926

Effective date: 20040303

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION