GB822900A - Improvements in or relating to electric proximity control systems - Google Patents
Improvements in or relating to electric proximity control systemsInfo
- Publication number
- GB822900A GB822900A GB3621555A GB3621555A GB822900A GB 822900 A GB822900 A GB 822900A GB 3621555 A GB3621555 A GB 3621555A GB 3621555 A GB3621555 A GB 3621555A GB 822900 A GB822900 A GB 822900A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- probe
- bridge
- level
- operated
- 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
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Automatic Analysis And Handling Materials Therefor (AREA)
Abstract
822,900. Electric tests. GREEN & SILLEY WEIR Ltd., R. & H. Dec. 12, 1956 [Dec. 16, 1955], No. 36215/55. Class 37. [Also in Group XXXV] The level of a liquid is maintained between predetermined limits by means of a single capacitive probe, the effective value of which is changed at one of the predetermined levels so as to set the probe for controlling the other limit. As shown, the conducting probe 1 acts as a capacitance in one arm of a bridge fed with R.F. current. When the liquid reaches a predetermined high level the bridge is so far out of balance that relay 6 in the diagonal is operated. The relay inserts capacity 7 in parallel with the probe and switches on pump 15. Thus, as the level falls relay 6 remains operated until the low level is reached, when the bridge is insufficiently unbalanced to maintain the relay operated and it drops out, stopping pump 15. Capacity 13 may be switched in parallel with the probe by manually-operated switch 14 to simulate the arrival of the liquid at the higher level when it is actually at the lower. The bridge is then adjusted to ensure that the relay just operates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3621555A GB822900A (en) | 1955-12-16 | 1955-12-16 | Improvements in or relating to electric proximity control systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3621555A GB822900A (en) | 1955-12-16 | 1955-12-16 | Improvements in or relating to electric proximity control systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB822900A true GB822900A (en) | 1959-11-04 |
Family
ID=10386052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3621555A Expired GB822900A (en) | 1955-12-16 | 1955-12-16 | Improvements in or relating to electric proximity control systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB822900A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2170331A (en) * | 1985-01-24 | 1986-07-30 | Ward Ind Plant Limited T W | Water level controller for a boiler |
-
1955
- 1955-12-16 GB GB3621555A patent/GB822900A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2170331A (en) * | 1985-01-24 | 1986-07-30 | Ward Ind Plant Limited T W | Water level controller for a boiler |
| US4662390A (en) * | 1985-01-24 | 1987-05-05 | T. W. Ward Industrial Plant Limited | Water level controller for a boiler |
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