GB1267214A - - Google Patents
Info
- Publication number
- GB1267214A GB1267214A GB1267214DA GB1267214A GB 1267214 A GB1267214 A GB 1267214A GB 1267214D A GB1267214D A GB 1267214DA GB 1267214 A GB1267214 A GB 1267214A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capacitor
- transistor
- oscillator
- fuel
- 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
Links
- 239000003990 capacitor Substances 0.000 abstract 8
- 239000000446 fuel Substances 0.000 abstract 3
- 239000007788 liquid Substances 0.000 abstract 2
- 239000002828 fuel tank Substances 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 abstract 1
- 230000003534 oscillatory effect Effects 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
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)
- Level Indicators Using A Float (AREA)
Abstract
1,267,214. Liquid level indication. SMITHS INDUSTRIES Ltd. July 17, 1970 [July 18, 1969], No.36214/69. Heading G1H. In an electrical capacitive liquid sensing, apparatus an oscillatory circuit 10 comprising two halves of a pair of bridge arms of a centre topped secondary winding 11 of a transformer 12, the bridge arms comprising a variable capacitor 13 and a fixed reference capacitor 14 and a pre-set reference capacitor 15, the arrangement is such that the variable capacitor 13 is disposed at the top or bottom of an aircraft fuel tank so that the value of the capacitor varies and when the fuel reaches a predetermined high or low level to activate or not an oscillator comprising an N-P-N transistor 16, a positive voltage supply line 17, the transformer primary 18, a pair of resistors 19, 20 and a negative voltage supply line 21, depending on whether a re-generative or de-generative feedback is supplied to the base electrode of transistor 16 when the fuel level reaches the predetermined level, the oscillator ceases to oscillate. The output signal of the oscillator is fed via a capacitor 28 to a clamping diode 29 and the clamped signal is smoothed by a resistor 30 and capacitor 31 and then applied to the P-N-P transistor 28 forming part of a D.C. amplifier. The oscillation fluctuation due to fuel surface ripple are prevented by a capacitor 32.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3621469 | 1969-07-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1267214A true GB1267214A (en) | 1972-03-15 |
Family
ID=10386044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1267214D Expired GB1267214A (en) | 1969-07-18 | 1969-07-18 |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE2035435A1 (en) |
| FR (1) | FR2051860A1 (en) |
| GB (1) | GB1267214A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2603185C2 (en) * | 1976-01-28 | 1986-05-28 | Otto Mitlödi Treier | Arrangement for capacitive measurement of the fill level of a container |
| DE102015122542A1 (en) * | 2015-12-22 | 2017-06-22 | Endress+Hauser Flowtec Ag | Field device of process measuring technology |
-
1969
- 1969-07-18 GB GB1267214D patent/GB1267214A/en not_active Expired
-
1970
- 1970-07-17 FR FR7026539A patent/FR2051860A1/fr not_active Withdrawn
- 1970-07-17 DE DE19702035435 patent/DE2035435A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE2035435A1 (en) | 1971-03-04 |
| FR2051860A1 (en) | 1971-04-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |