GB988372A - Improvements in or relating to vacuum freeze drying processes - Google Patents
Improvements in or relating to vacuum freeze drying processesInfo
- Publication number
- GB988372A GB988372A GB42950/61A GB4295061A GB988372A GB 988372 A GB988372 A GB 988372A GB 42950/61 A GB42950/61 A GB 42950/61A GB 4295061 A GB4295061 A GB 4295061A GB 988372 A GB988372 A GB 988372A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bridge
- heating apparatus
- dried
- freeze drying
- measuring instrument
- 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.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
- F26B5/06—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum the process involving freezing
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
- G05D23/1909—Control of temperature characterised by the use of electric means using an analogue comparing device whose output amplitude can only take two discrete values
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
Abstract
988,372. Automatic temperature control systems for vacuum freeze drying apparatus. LEYBOLD-ANLAGEN HOLDING A.G. Nov. 30, 1961 [Dec. 1,1960], No. 42950/61. Heading G3R. An automatic temperature control system for controlling the heating apparatus used in a vacuum freeze drying process in which the material to be dried is initially frozen into a solid state and then placed in a vacuum chamber wherein the material is dried by sublimation has the heating apparatus of the vacuum chamber controlled with the aid of temperature responsive resistors connected in a Wheatstone bridge, the temperature responsive resistor 1 being embedded in the material to be dried, the temperature responsive resistor 2 being placed adjacent the heating apparatus 7 and the resistors 3,4 being placed in a chamber the temperature of which is maintained constant, a measuring instrument 5 being placed across the diagonal of the bridge, the constants 13,14 of which instrument are operated to energize the heating apparatus 7 and a cooling apparatus 8 such that the heating of the vacuum chamber is maintained at a point to cause drying of the frozen material by sublimation thereof. In a second embodiment the two resistors 1, 2 are placed in the same arm of the bridge and the cooling apparatus 8 excluded whilst in a further embodiment the measuring instrument 5 is protected against overload by the provision of a further, relatively insensitive, measuring instrument which is operative when the bridge is severely unbalanced. A transistorised amplifying element may be included in the bridge diagonal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL37705A DE1135832B (en) | 1960-12-01 | 1960-12-01 | Electric temperature control device for freeze-drying goods |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB988372A true GB988372A (en) | 1965-04-07 |
Family
ID=7267996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB42950/61A Expired GB988372A (en) | 1960-12-01 | 1961-11-30 | Improvements in or relating to vacuum freeze drying processes |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1135832B (en) |
| GB (1) | GB988372A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4672177A (en) * | 1985-11-12 | 1987-06-09 | International Business Machines Corporation | Environmental sensor control of a heated fuser |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1218958B (en) * | 1963-01-18 | 1966-06-08 | Siemens Elektrogeraete Gmbh | Automatic switch-off device for a hot air dryer |
-
1960
- 1960-12-01 DE DEL37705A patent/DE1135832B/en active Pending
-
1961
- 1961-11-30 GB GB42950/61A patent/GB988372A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4672177A (en) * | 1985-11-12 | 1987-06-09 | International Business Machines Corporation | Environmental sensor control of a heated fuser |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1135832B (en) | 1962-08-30 |
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