GB897928A - Improvements in or relating to electrical control systems - Google Patents

Improvements in or relating to electrical control systems

Info

Publication number
GB897928A
GB897928A GB25060/58A GB2506058A GB897928A GB 897928 A GB897928 A GB 897928A GB 25060/58 A GB25060/58 A GB 25060/58A GB 2506058 A GB2506058 A GB 2506058A GB 897928 A GB897928 A GB 897928A
Authority
GB
United Kingdom
Prior art keywords
controller
relay
amplifier
control
level
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
Application number
GB25060/58A
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.)
Commonwealth Scientific and Industrial Research Organization CSIRO
Original Assignee
Commonwealth Scientific and Industrial Research Organization CSIRO
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
Priority claimed from AU30228/57A external-priority patent/AU224353B2/en
Application filed by Commonwealth Scientific and Industrial Research Organization CSIRO filed Critical Commonwealth Scientific and Industrial Research Organization CSIRO
Publication of GB897928A publication Critical patent/GB897928A/en
Expired legal-status Critical Current

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
    • G05D23/22—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 being a thermocouple
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Non-Electrical Variables (AREA)
  • Control Of Temperature (AREA)

Abstract

897,928. Automatic temperature-control systems. COMMONWEALTH SCIENTIFIC. & INDUSTRIAL RESEARCH ORGANIZATION. Aug. 5, 1958 [Aug. 8, 1957], No. 25060/58. Class 38 (4). In a two-step controller for controlling a condition of a medium, the voltage of a detector, which is representative of the condition, is combined in series with that of a condenser which is being charged when the controller is being operated at one level and is being discharged when the controller is operating at the other level, and the magnitude of the combined voltage determines the level at which the controller is operating. In Fig. 2, the temperature of a furnace 1 is automatically maintained at a desired value by including in series with the furnace A.C. heater (not shown) contacts S of an on-off relay 3 energized through an amplifier 2 from a thermocouple T responsive to furnace temperature. To reduce hunting, further contacts S 1 of relay 3 control the charging and discharging of a condenser C, a portion of the voltage across which is supplied as negative feedback to the input of amplifier 2. In a modification, Fig. 3 (not shown), feedback from another resistance-capacity network having a longer time constant is also applied to the input of amplifier 2 under the control of further contacts of relay 3. Application to the automatic control of pressure and hydrogen ion concentration in liquids is referred to.
GB25060/58A 1957-08-08 1958-08-05 Improvements in or relating to electrical control systems Expired GB897928A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU30228/57A AU224353B2 (en) 1957-08-08 Improved electrical control system

Publications (1)

Publication Number Publication Date
GB897928A true GB897928A (en) 1962-05-30

Family

ID=3718196

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25060/58A Expired GB897928A (en) 1957-08-08 1958-08-05 Improvements in or relating to electrical control systems

Country Status (1)

Country Link
GB (1) GB897928A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632985A (en) * 1970-03-09 1972-01-04 Blue Electric Co M Thermocouple bridge temperature control

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632985A (en) * 1970-03-09 1972-01-04 Blue Electric Co M Thermocouple bridge temperature control

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