GB905861A - Improvements in and relating to control apparatus for supervising or regulating the level of liquid in tanks - Google Patents
Improvements in and relating to control apparatus for supervising or regulating the level of liquid in tanksInfo
- Publication number
- GB905861A GB905861A GB793359A GB793359A GB905861A GB 905861 A GB905861 A GB 905861A GB 793359 A GB793359 A GB 793359A GB 793359 A GB793359 A GB 793359A GB 905861 A GB905861 A GB 905861A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- relay
- level
- resistors
- voltage
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
- G01F23/241—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid for discrete levels
- G01F23/243—Schematic arrangements of probes combined with measuring circuits
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
905,861. Feedwater regulators for steam boilers. DAMPFERZEUGER VEB. March 6, 1959, No. 7933/59. Class 123 (2). [Also in Groups XVIII and XXXVI] In a liquid level indicating system, electrodes are positioned in a container to correspond to the highest or lowest level and are each connected in a bridge circuit the outputs of which are fed to an electronic valve controlling two relays of different sensitivity depending on the relative positions of the liquid level and the electrodes. The boiler feed water control system shown is started by setting switch 4 to position 2 and closing push-button 35. If the water covers the lower electrode 13, the bridge circuit formed by resistors 14, 15, 16 will be unbalanced so that the output, when rectified by a voltage doubling circuit 51, 52, will cause valve 9 to energize the more sensitive relay 23. This action lights an indicator lamp 31 and energizes a boiler fuel supply relay 22. When the water level is below electrode 12 a bridge circuit formed by the resistors 17, 18, 19 is approximately balanced, so that its small alternating voltage output, after rectification by a voltage doubling circuit comprising rectifiers 47, 48, provides a voltage which is insufficient to allow valve 9 to energize the lesssensitive relay 20. When the water level covers electrode 12, relay 20 is energized, lighting an indicator lamp 33 and stopping the feed water pump or valve 21. In the event of the water level falling below electrode 13, the bridge comprising resistors 14, 15, 16 becomes approximately balanced, reducing the current of valve 9 so that both relays 23, 20 are released, releasing the fuel supply relay 22, energizing visual and audible alarms 36, 37 and providing an indication on a recorder 38. The system cannot be restarted until push-button 35 is again operated. Fig. 1 (not shown) relates to an arrangement in which the bridge circuits are fed with direct voltage and are connected to successive grids of valve 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB793359A GB905861A (en) | 1959-03-06 | 1959-03-06 | Improvements in and relating to control apparatus for supervising or regulating the level of liquid in tanks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB793359A GB905861A (en) | 1959-03-06 | 1959-03-06 | Improvements in and relating to control apparatus for supervising or regulating the level of liquid in tanks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB905861A true GB905861A (en) | 1962-09-12 |
Family
ID=9842582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB793359A Expired GB905861A (en) | 1959-03-06 | 1959-03-06 | Improvements in and relating to control apparatus for supervising or regulating the level of liquid in tanks |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB905861A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3279379A (en) * | 1964-01-21 | 1966-10-18 | Regent Controls Inc | Liquid level control |
| GB2287538A (en) * | 1994-03-10 | 1995-09-20 | Pai Lung Machinery Mill Co Ltd | Water level detector and indicator system |
-
1959
- 1959-03-06 GB GB793359A patent/GB905861A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3279379A (en) * | 1964-01-21 | 1966-10-18 | Regent Controls Inc | Liquid level control |
| GB2287538A (en) * | 1994-03-10 | 1995-09-20 | Pai Lung Machinery Mill Co Ltd | Water level detector and indicator system |
| GB2287538B (en) * | 1994-03-10 | 1997-05-21 | Pai Lung Machinery Mill Co Ltd | Water level detector and indicator system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4263587A (en) | Liquid level control system | |
| GB972171A (en) | Intruder alarms | |
| US2994073A (en) | Fault annunciator | |
| GB966753A (en) | Electrical apparatus responsive to changes in a physical variable | |
| GB905861A (en) | Improvements in and relating to control apparatus for supervising or regulating the level of liquid in tanks | |
| US3485742A (en) | Pressure responsive control circuit for an electrolysis-type hydrogen generator | |
| GB1227552A (en) | ||
| JPS57152025A (en) | Safety device for computer | |
| US3197755A (en) | Apparatus for detecting and correcting malfunction of a standard, reference electrode | |
| GB1183229A (en) | Improvements in or relating to Control Circuits for Alarm Devices | |
| GB963306A (en) | A control device for boilers and/or boiler drums | |
| GB1139911A (en) | Improvements in and relating to electrode boilers | |
| GB883184A (en) | Improvements in electrically-operated liquid supply regulating apparatus | |
| US2726670A (en) | Flow control apparatus | |
| JPS5569373A (en) | Gas safety device | |
| GB670100A (en) | Means for indicating a fall below a predetermined low level of water in a vessel and/or regulating the supply of feed water thereto | |
| GB1336876A (en) | Electric current regulators | |
| JPS5523767A (en) | Current detection circuit for control valve of inverter | |
| JPS55109198A (en) | Power system stabilizer | |
| JPS5697747A (en) | Controlling circuit for water heater | |
| JPS56152537A (en) | Liquid level monitor for electric discharge machining device | |
| GB745307A (en) | Improvements in or relating to respiratory apparatus | |
| JPS5734224A (en) | Power control circuit | |
| JPS5451276A (en) | Power failure detection indicating circuit | |
| JPS5757324A (en) | Battery backup system of semiconductor storage device |