GB657535A - Improvements in or relating to automatic temperature control systems - Google Patents
Improvements in or relating to automatic temperature control systemsInfo
- Publication number
- GB657535A GB657535A GB1021447A GB1021447A GB657535A GB 657535 A GB657535 A GB 657535A GB 1021447 A GB1021447 A GB 1021447A GB 1021447 A GB1021447 A GB 1021447A GB 657535 A GB657535 A GB 657535A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thermocouple
- predetermined temperature
- temperature control
- series
- controlled
- 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
-
- 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
- G05D23/2037—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature details of the regulator
- G05D23/2039—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature details of the regulator using mechanical means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Temperature (AREA)
Abstract
657,535. Automatic temperature control systems. FOSTER INSTRUMENT CO., Ltd., and HACKETT, C. E. April 17, 1947, No. 10214. [Class 38 (iv)] An automatic temperature control system comprises a main heater 3 and two antihunting thermocouples 7, 9 situated remote from the temperature to be controlled and associated with auxiliary heaters 8, 10, auxiliary heaters being connected in series with each other and in parallel with the main heater 3. The heaters have a common switch 4 operated by a chopper bar 5 and galvanometer 2 controlled by the thermocouple 1 so that above a predetermined temperature the switch 4 is switched off, whilst below a predetermined temperature it is switched on. The auxiliary heaters 8, 10 are connected through a step-down transformer 11 across the main heater supply, and the thermocouple 7 is connected in series with and in the same sense as the thermocouple 1. The thermocouple 7 and heater 8 have a low heat inertia thus allowing the predetermined temperature to be controlled within close limits. In order to obtain a low temperature reading however, the second auxiliary thermocouple 9 having a high heat inertia is connected in series with, but in the opposite sense to the thermocouples 7 and 1, the current delivered to the galvanometer 2 by thermocouple 9 being equal and opposite to that delivered by the thermocouple 7 when both are at the predetermined temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1021447A GB657535A (en) | 1947-04-17 | 1947-04-17 | Improvements in or relating to automatic temperature control systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1021447A GB657535A (en) | 1947-04-17 | 1947-04-17 | Improvements in or relating to automatic temperature control systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB657535A true GB657535A (en) | 1951-09-19 |
Family
ID=9963687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1021447A Expired GB657535A (en) | 1947-04-17 | 1947-04-17 | Improvements in or relating to automatic temperature control systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB657535A (en) |
-
1947
- 1947-04-17 GB GB1021447A patent/GB657535A/en not_active Expired
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