GB2400665A - A laboratory thermostat for controlling the temperature of a liquid bath - Google Patents
A laboratory thermostat for controlling the temperature of a liquid bath Download PDFInfo
- Publication number
- GB2400665A GB2400665A GB0408531A GB0408531A GB2400665A GB 2400665 A GB2400665 A GB 2400665A GB 0408531 A GB0408531 A GB 0408531A GB 0408531 A GB0408531 A GB 0408531A GB 2400665 A GB2400665 A GB 2400665A
- Authority
- GB
- United Kingdom
- Prior art keywords
- laboratory thermostat
- thermostat
- laboratory
- liquid
- monitoring
- 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.)
- Granted
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 230000000007 visual effect Effects 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims description 2
- 238000012806 monitoring device Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 230000001580 bacterial effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000001476 alcoholic effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
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 has an early warning system with an electronic regulating/safety device 5 for monitoring the lower level of the liquid in the bath vessel and an evaluating device at least for a visual and/or acoustic warning signal which may be emitted while the temperature control process continues. The level of the liquid is monitored by a float 10 with electrical switching elements 11, 12. Switching element 12, when activated, serves to provide an early warning that the liquid level in the vessel is getting low, and emits a warning via buzzer 6 to alert a user of the thermostat to top-up the vessel with liquid.
Description
83498.623 Laboratory Thermostat The invention relates to a laboratory
thermostat having a heating and/or cooling device for controlling the temperature of a liquid bath medium contained in a bath vessel.
Laboratory thermostats are used for high-precision temperature control and maintaining an adjustable constant temperature. The main functional elements are the heater, circulating pump and electronic regulating means. The temperature control liquid is contained in a bath vessel. The temperature control medium used is water, bath oil for higher temperatures or alcoholic liquids for minus temperatures.
Laboratory thermostats are used both for internal temperature control tasks in the bath vessel and also for the external temperature control of a consuming device using an integral circulating pump. The temperature control of external measuring and analytical system equipment, reaction systems or measuring cells in a temperature control circuit are the main applications in science and
research and in many fields of industry.
Liquid may be lost as a result of the evaporation of the bath medium used or as a result of leaks occurring in the external circuit. If a built-in lower level safety device is used this automatically causes the system to shut down.
However, shutting down may cause problems with the treatment. For example, when the temperature of bacterial cultures is being controlled internally - 2 - in a bath vessel there is a risk that these bacterial cultures will be irrevocably destroyed by a sudden interruption to the temperature control process. Moreover, in external processes, an interruption to the temperature control may mean that the entire process has to be repeated, at corresponding expense.
There is therefore a disadvantage in such known laboratory thermostats in that problems may be caused by premature unintentional shutting down of the laboratory thermostat by means of the lower level safety device.
According to the invention there is provided a laboratory thermostat with a heating and/or cooling device for controlling the temperature of a liquid bath medium contained in a bath vessel, wherein the laboratory thermostat comprises an early warning system with a device for monitoring a lower level of the liquid bath medium in the bath vessel, and an evaluating device to provide at least an acoustic and/or visual warning signal, while continuing with the temperature control process.
The integrated early warning system alerts the user of the laboratory thermostat to the fact that the liquid level has fallen, in good time before the system is undesirably shut down by a lower level safety device, so that the temperature control liquid, i.e. the liquid bath medium, can be topped up immediately before the safety cutout is actuated by a lower level safety device.
Additional embodiments of the invention are recited in the subsidiary claims. - 3
Preferred embodiments of the invention will now be described by way of example only and with reference to the accompanying drawings, in which: Fig. 1 shows a partly cut-away side view of a laboratory thermostat with early warning system; Fig. 2 shows a front view; and Fig.3 shows a rear view of the laboratory thermostat in Figs. 1 and 2.
A laboratory thermostat as shown in the drawings has electronic regulating/safety means 5 with a monitoring device for monitoring the lower level of liquid in the bath vessel and an evaluating device at least for a visual and/or acoustic warning signal.
It also comprises a temperature sensor 6, a heater 7, a submersible pump 8 with external pump connections 9, a float 10 with electrical switching element 11 which can perform a shutting down function, particularly a safety cut-out.
The novel early warning system has another switching element 12. The electronic regulating/ safety means 5 comprises a buzzer 13 for a pulsed acoustic signal actuation and is electrically connected to the switching element 12 and the switching element 11 which triggers a shutdown function with a continuous signal tone.
The early warning system is integrated in the heating/cooling thermostat (Fig. 2) and in recirculating coolers with a membrane keyboard 14 arranged in a circle, a VFD information display 15, - 4 - a mains switch 16, an adjustable overheating safety device 17 and a visual display of warning and safety functions 18. On the reverse (Fig. 3) there are connections for Pt 100 external sensors 19, a refrigeration control 20 and an interface 21 through which an early warning function can be communicated to the outside. )
Claims (7)
- Claims 1. A laboratory thermostat with a heating and/or cooling device forcontrolling the temperature of a liquid bath medium contained in a bath vessel, wherein the laboratory thermostat comprises an early warning system with a device for monitoring a lower level of the liquid bath medium in the bath vessel, and an evaluating device to provide at least an acoustic and/or visual warning signal, while continuing with the temperature control process.
- 2. A laboratory thermostat as claimed in claim 1, wherein the response threshold of the early warning system is above the response threshold of a lower level safety device.
- 3. A laboratory thermostat as claimed in claims 1 or 2, wherein the monitoring device comprises a float connected to an electrical switching element and wherein the electrical switching element is preferably electrically connected to an acoustic warning element, for example a buzzer for an acoustic warning signal.
- 4. A laboratory thermostat as claimed in any of claims 1 to 3, wherein a pulsed warning signal from an acoustic warning element and/or a monitoring lamp is provided.
- 5. A laboratory thermostat as claimed in any of claims 1 to 4, wherein the laboratory thermostat further comprises an interface having a connectable cable for remote monitoring of the warning function from outside. r - 6 -
- 6. A laboratory thermostat as claimed in any of claims 1 to 5, wherein the laboratory thermostat further comprises a membrane keyboard arranged in a circle and a VFD information display.
- 7. A laboratory thermostat substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE20306059U DE20306059U1 (en) | 2003-04-16 | 2003-04-16 | laboratory thermostat |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0408531D0 GB0408531D0 (en) | 2004-05-19 |
| GB2400665A true GB2400665A (en) | 2004-10-20 |
| GB2400665B GB2400665B (en) | 2006-09-13 |
Family
ID=7981521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0408531A Expired - Fee Related GB2400665B (en) | 2003-04-16 | 2004-04-16 | Laboratory thermostat |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20040216862A1 (en) |
| CN (1) | CN100345636C (en) |
| DE (1) | DE20306059U1 (en) |
| GB (1) | GB2400665B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8469678B2 (en) * | 2010-02-03 | 2013-06-25 | Preston Industries, Inc. | Constant temperature circulator |
| US8616268B2 (en) * | 2010-07-15 | 2013-12-31 | Preston Industries, Inc. | Movable constant temperature circulator assembly |
| 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 |
| CN105115186B (en) * | 2015-09-15 | 2017-09-26 | 江苏天舒电器有限公司 | A kind of cold and hot bascule of heat pump water-heating machine laboratory |
| CN109361533B (en) * | 2018-09-17 | 2022-12-23 | 视联动力信息技术股份有限公司 | Temperature resistance testing method and device |
| DE102019133584A1 (en) * | 2019-12-09 | 2021-06-10 | Friedhelm Selbach Gmbh | Cooling device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| JPH11294863A (en) * | 1998-04-10 | 1999-10-29 | Sakaguchi Dennetsu Kk | Heater for heating liquid |
Family Cites Families (6)
| 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 |
| 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 |
| CN2079320U (en) * | 1990-11-27 | 1991-06-19 | 北京光电设备厂 | High precision controller constant temp. |
| US6028521A (en) * | 1997-12-16 | 2000-02-22 | Issachar; David | Liquid level sensor |
-
2003
- 2003-04-16 DE DE20306059U patent/DE20306059U1/en not_active Expired - Lifetime
-
2004
- 2004-04-05 US US10/818,245 patent/US20040216862A1/en not_active Abandoned
- 2004-04-15 CN CNB2004100348919A patent/CN100345636C/en not_active Expired - Fee Related
- 2004-04-16 GB GB0408531A patent/GB2400665B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| JPH11294863A (en) * | 1998-04-10 | 1999-10-29 | Sakaguchi Dennetsu Kk | Heater for heating liquid |
Also Published As
| Publication number | Publication date |
|---|---|
| DE20306059U1 (en) | 2003-06-18 |
| CN100345636C (en) | 2007-10-31 |
| US20040216862A1 (en) | 2004-11-04 |
| GB0408531D0 (en) | 2004-05-19 |
| CN1539554A (en) | 2004-10-27 |
| GB2400665B (en) | 2006-09-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20150416 |