GB892957A - Liquid level supervisory apparatus - Google Patents
Liquid level supervisory apparatusInfo
- Publication number
- GB892957A GB892957A GB13981/60A GB1398160A GB892957A GB 892957 A GB892957 A GB 892957A GB 13981/60 A GB13981/60 A GB 13981/60A GB 1398160 A GB1398160 A GB 1398160A GB 892957 A GB892957 A GB 892957A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capacitor
- transistor
- bridge
- water level
- oscillation
- 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
- 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
- G01F23/26—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/265—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors for discrete levels
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
892,957. Transistor relay circuits. AMERICAN DISTRICT TELEGRAPH CO. April 21, 1960 [July 21, 1959], No. 13981/60. Class 40(6). [Also in Group XXXVI] In a liquid level detector (see Group XXXVI) comprising a capacitance bridge connected in the feedback path of a transistor amplifier, the bridge circuit comprises inductive ratio arms 14, 15 a reference capacitor 13 and a concentric measuring capacitor 10 immersed in a water tank. The capacitor 10 is connected via blocking capacitors 17, 18. The output diagonal is coupled to the base/emitter electrodes of transistor 20, the output of which is fed back to the ratio arms 14, 15 by winding 22. As the water level approaches electrode 10 the bridge becomes balanced and the feedback changes from degenerative to regenerative, initiating oscillation in transistor 20. The start of oscillation causes diode 19 to conduct, short circuiting the measuring capacitor 10 and increasing the unbalance of the bridge so that the circuit rapidly reaches a state of limiting oscillation. The circuit is therefore described as bi-stable, being either non-oscillating or oscillating with saturation current flowing. When the water level is below electrode 10, coil 23 is de-energized so that a clockwork mechanism 26 is able to generate a coded alarm signal. The system may be tested by closing switch 33, bringing diodes 34, 35 into conduction and connecting capacitor 36 across the reference capacitor 13. This has the same effect as low water level.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US892957XA | 1959-07-21 | 1959-07-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB892957A true GB892957A (en) | 1962-04-04 |
Family
ID=22216829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB13981/60A Expired GB892957A (en) | 1959-07-21 | 1960-04-21 | Liquid level supervisory apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB892957A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1907019A1 (en) * | 1968-02-13 | 1969-11-13 | Rank Xerox Ltd | Method and device for determining the amount of a substance present in a container |
| GB2142145A (en) * | 1983-04-27 | 1985-01-09 | Electronic Components Ltd | Liquid level sensing apparatus |
| US5861811A (en) * | 1996-04-03 | 1999-01-19 | Lease; Benjamin N. | Fluid sensor |
| CN108332820A (en) * | 2018-04-25 | 2018-07-27 | 深圳市科烸芯科技有限公司 | A kind of liquid level detection circuit and liquid level detection device |
-
1960
- 1960-04-21 GB GB13981/60A patent/GB892957A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1907019A1 (en) * | 1968-02-13 | 1969-11-13 | Rank Xerox Ltd | Method and device for determining the amount of a substance present in a container |
| GB2142145A (en) * | 1983-04-27 | 1985-01-09 | Electronic Components Ltd | Liquid level sensing apparatus |
| US5861811A (en) * | 1996-04-03 | 1999-01-19 | Lease; Benjamin N. | Fluid sensor |
| CN108332820A (en) * | 2018-04-25 | 2018-07-27 | 深圳市科烸芯科技有限公司 | A kind of liquid level detection circuit and liquid level detection device |
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