GB1041438A – Automatic control system
– Google Patents
GB1041438A – Automatic control system
– Google Patents
Automatic control system
Info
Publication number
GB1041438A
GB1041438A
GB42863/64A
GB4286364A
GB1041438A
GB 1041438 A
GB1041438 A
GB 1041438A
GB 42863/64 A
GB42863/64 A
GB 42863/64A
GB 4286364 A
GB4286364 A
GB 4286364A
GB 1041438 A
GB1041438 A
GB 1041438A
Authority
GB
United Kingdom
Prior art keywords
temperature
bridge
relay
heaters
furnace
Prior art date
1963-11-07
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
GB42863/64A
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.)
Leeds and Northrup Co
Original Assignee
Leeds and Northrup Co
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.)
1963-11-07
Filing date
1964-10-21
Publication date
1966-09-07
1964-10-21
Application filed by Leeds and Northrup Co
filed
Critical
Leeds and Northrup Co
1966-09-07
Publication of GB1041438A
publication
Critical
patent/GB1041438A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
Abstract
1,041,438. Automatic temperature control of furnaces. LEEDS & NORTHRUP CO. Oct. 21, 1964 [Nov. 7, 1963], No. 42863/64. Heading G3R. An automatic control system for controlling the value of a physical variable, such as the temperature of a furnace, comprises two bridge circuits which are unbalanced when a deviation occurs in the physical variable the system being effective to restore the variable by a series of pulses. The temperature of a furnace 10 is detected by a thermocouple 13 which applies a voltage to a measuring circuit 14 and a recording device 19, 20. The thermocouple voltage is further applied to a detector 15 which, inter alia serves to adjust a contact 16a relatively to slidewire 16 so that upon a deviation of the furnace temperature from the desired value, set by means of a control 18c, the bridge circuit 22 becomes unbalanced. With no feedback from the bridge circuit 27 an output then appears from an amplifier 55 to energize a relay 56. Should the deviation in temperature be low the relay 56 is energized to close contacts RL whereupon motor 42 is energized to open a valve 12 in the fuel supply to the furnace 10 to restore the temperature thereof to the desired value. Closure of contacts RL of relay 56 also energizes heaters 34, 35 associated with temperature sensitive resistors 30, 32 forming part of the feedback bridge circuit 27. The thermal inertia of resistor 30 is lower than that of resistor 32, there upon energization of heaters 34, 35 the bridge circuit 27 becomes unbalanced so that the signal from this bridge, taken from an adjustable resistor 48 to provide proportionality, gradually increases until it equals the signal from the bridge 22. Relay 56 then releases, motor 42 and heaters 34, 35 become de-energized. Upon de-energization of the heaters 34, 35 the feedback signal decays whereupon the resultant.signal unbalance to the amplifier 55 again closes contacts RL and the cycle repeats until the furnace is restored to the desired temperature. Should the temperature derivation be high contacts RH of relay 56 close to energize heaters 36, 37 associated with resistors 31, 33 in the bridge circuit 27. Adjustment of the operating conditions of the bridge 27 is made by means of a gauged control on variable resistor 46, 50, 51. In a further embodiment the bridge circuits 22, 27 are incorporated into a single bridge.
GB42863/64A
1963-11-07
1964-10-21
Automatic control system
Expired
GB1041438A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US322190A
US3295033A
(en)
1963-11-07
1963-11-07
Position control system with heated resistor feedback network
Publications (1)
Publication Number
Publication Date
GB1041438A
true
GB1041438A
(en)
1966-09-07
Family
ID=61970618
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB42863/64A
Expired
GB1041438A
(en)
1963-11-07
1964-10-21
Automatic control system
Country Status (3)
Country
Link
US
(1)
US3295033A
(en)
FR
(1)
FR1416649A
(en)
GB
(1)
GB1041438A
(en)
Families Citing this family (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3522439A
(en)
*
1964-10-28
1970-08-04
Robertshaw Controls Co
Automatic-to-manual switching system for a process controller
US3654544A
(en)
*
1970-01-13
1972-04-04
Us Army
Thermal equilibrium regulator for a thermoelectric power source
Family Cites Families (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2300537A
(en)
*
1940-06-03
1942-11-03
Leeds & Northrup Co
Control system
US2325232A
(en)
*
1941-11-07
1943-07-27
Leeds & Northrup Co
Control system
US2325308A
(en)
*
1942-04-22
1943-07-27
Leeds & Northrup Co
Electrical system
US2694169A
(en)
*
1950-05-05
1954-11-09
Honeywell Regulator Co
Electric proportioning control apparatus with automatic reset
US2666889A
(en)
*
1951-03-15
1954-01-19
Honeywell Regulator Co
Control apparatus
US2823861A
(en)
*
1956-10-04
1958-02-18
Leeds & Northrup Co
Control systems with rate of approach
1963
1963-11-07
US
US322190A
patent/US3295033A/en
not_active
Expired – Lifetime
1964
1964-10-21
GB
GB42863/64A
patent/GB1041438A/en
not_active
Expired
1964-11-06
FR
FR994107A
patent/FR1416649A/en
not_active
Expired
Also Published As
Publication number
Publication date
FR1416649A
(en)
1965-11-05
US3295033A
(en)
1966-12-27
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