GB1248993A – Capacitance-type liquid gage
– Google Patents
GB1248993A – Capacitance-type liquid gage
– Google Patents
Capacitance-type liquid gage
Info
Publication number
GB1248993A
GB1248993A
GB25511/69A
GB2551169A
GB1248993A
GB 1248993 A
GB1248993 A
GB 1248993A
GB 25511/69 A
GB25511/69 A
GB 25511/69A
GB 2551169 A
GB2551169 A
GB 2551169A
GB 1248993 A
GB1248993 A
GB 1248993A
Authority
GB
United Kingdom
Prior art keywords
capacitor
liquid
output
immersed
demodulator
Prior art date
1968-05-20
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
GB25511/69A
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.)
Consolidated Airborne Systems Inc
Original Assignee
Consolidated Airborne Systems Inc
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.)
1968-05-20
Filing date
1969-05-19
Publication date
1971-10-06
1969-05-19
Application filed by Consolidated Airborne Systems Inc
filed
Critical
Consolidated Airborne Systems Inc
1971-10-06
Publication of GB1248993A
publication
Critical
patent/GB1248993A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
G01F23/266—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 measuring circuits therefor
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
Abstract
1,248,993. Measuring liquid level electrically. CONSOLIDATED AIRBORNE SYSTEMS Inc. May 19, 1969 [May 20, 1968], No. 25511/69. Heading G1N. Apparatus for measuring the level and volume of liquid in a container comprises a bridge circuit including a capacitive sensor C1, Fig. 1B (not shown) immersed in the liquid and a reference capacitor C3, the centre-tapped secondary winding of the transformer forming the remaining arms of the bridge. A compensating capacitor C2 also immersed in the liquid and connected in the feedback path between the input and output of an operational amplifier 10 corrects for variations of its permittivity. The output of the amplifier operates on indicator 18 via a demodulator 16 to allow for the progressive uncovering of a capacitor C2. The output of the demodulator is also applied via a limiter 20 to a modulator 12 to control the signal in a second feedback path including a capacitor C4 (not illustrated). By associating an external fixed podder capacitor with capacitor C2 selected in accordance with the relation between liquid permittivity and density, the apparatus is used to indicate the mass of liquid in the container. Another embodiment Fig.2A (not shown) utilizes a capacitor C2 totally immersed in the liquid and which does not become uncovered.
GB25511/69A
1968-05-20
1969-05-19
Capacitance-type liquid gage
Expired
GB1248993A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US73040368A
1968-05-20
1968-05-20
Publications (1)
Publication Number
Publication Date
GB1248993A
true
GB1248993A
(en)
1971-10-06
Family
ID=24935199
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB25511/69A
Expired
GB1248993A
(en)
1968-05-20
1969-05-19
Capacitance-type liquid gage
Country Status (6)
Country
Link
US
(1)
US3534606A
(en)
DE
(1)
DE1925422A1
(en)
FR
(1)
FR2009923A1
(en)
GB
(1)
GB1248993A
(en)
IL
(1)
IL32228A
(en)
SE
(1)
SE378908B
(en)
Families Citing this family (26)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE1266586B
(en)
*
1966-02-19
1968-04-18
Albert Vogt
Elastic sealing ring for cast socket pipe connections, in particular stoneware pipes
US3728897A
(en)
*
1970-11-16
1973-04-24
Cons Airborne Systems
Compensated fuel gage
US3797311A
(en)
*
1972-02-11
1974-03-19
R Blanchard
Fluid level meter
US3795146A
(en)
*
1972-05-12
1974-03-05
Vapor Corp
Reference signal differentiating capacitive fluid level gauge
US3919455A
(en)
*
1972-10-20
1975-11-11
Hoffmann La Roche
Apparatus for the measurement of the volume and flow rate of liquids
US4054833A
(en)
*
1976-06-11
1977-10-18
Setra Systems, Inc.
Capacitance measuring system
US4173893A
(en)
*
1976-10-12
1979-11-13
Hedrick Geoffrey S
Fluid quantity indicator
US4145927A
(en)
*
1977-11-10
1979-03-27
Larson Roger G
Apparatus for determining the liquid level in a tank
US4235106A
(en)
*
1978-12-08
1980-11-25
Drexelbrook Controls, Inc.
System and method for obtaining compensated level measurements
DE2936309A1
(en)
*
1979-09-07
1981-03-26
Geoffrey S. Malvern Pa. Hedrick
Fluid quantity indicator esp. for aviation fuel – uses capacitive sensing probes with capacity change proportional to amount of fluid in tank or container
US4296472A
(en)
*
1979-10-01
1981-10-20
Rockwell International Corporation
Non-intrusive fluid measuring system
DE2945965A1
(en)
*
1979-11-14
1981-05-27
Vdo Adolf Schindling Ag, 6000 Frankfurt
DEVICE FOR CAPACITIVE LEVEL MEASUREMENT
US4383445A
(en)
*
1981-01-29
1983-05-17
Combustion Engineering, Inc.
Capacitance circuit for level measurement
US4624139A
(en)
*
1984-09-21
1986-11-25
Berwind Corporation
Capacitance-type material level indicator
US5042299A
(en)
*
1990-07-23
1991-08-27
Iimorrow, Inc.
Capacitive fluid level sensor
US5138880A
(en)
*
1991-05-29
1992-08-18
Lee/Maatuk Engineering, Inc.
Digital level sensing probe system
DE69415564T2
(en)
*
1993-02-01
1999-06-17
Lee Maatuk Engineering Inc
Hessonde for different liquids and inclined liquid levels
US6125696A
(en)
*
1993-10-27
2000-10-03
Kdi Precision Products, Inc.
Digital liquid level sensing apparatus
US6138508A
(en)
*
1993-10-27
2000-10-31
Kdi Precision Products, Inc.
Digital liquid level sensing apparatus
US5406843A
(en)
*
1993-10-27
1995-04-18
Kdi Corporation, Inc.
Digital liquid level sensing apparatus
US5437184A
(en)
*
1993-10-27
1995-08-01
Kdi/Triangle Electronics, Inc.
Capacitive liquid level sensor having phase detecting circuitry
US5613399A
(en)
*
1993-10-27
1997-03-25
Kdi Precision Products, Inc.
Method for liquid level detection
FR2751074B1
(en)
*
1996-07-11
1998-11-06
Comm Composants Soc Ind
CAPACITIVE MEASUREMENT OF THE LEVEL OF A LIQUID IN A TANK
GB2550402B
(en)
2016-05-19
2022-04-20
Ultra Electronics Ltd
Circuit for simulating a capacitance fuel probe
KR20190032604A
(en)
*
2016-08-17
2019-03-27
케이에스알 아이피 홀딩스 엘엘씨.
Capacitive fluid level sensor for fast response
US11067607B2
(en)
2016-08-17
2021-07-20
KSR IP Holdings, LLC
Sensing systems using current steering bridges
Family Cites Families (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2908166A
(en)
*
1954-04-01
1959-10-13
Smiths America Corp
Liquid level indicating devices
US3237178A
(en)
*
1963-11-01
1966-02-22
Honeywell Inc
Control apparatus
US3339412A
(en)
*
1965-10-18
1967-09-05
Frederick L Maltby
Capacitance measuring apparatus
1968
1968-05-20
US
US730403A
patent/US3534606A/en
not_active
Expired – Lifetime
1969
1969-05-14
IL
IL32228A
patent/IL32228A/en
unknown
1969-05-19
SE
SE6907025A
patent/SE378908B/xx
unknown
1969-05-19
GB
GB25511/69A
patent/GB1248993A/en
not_active
Expired
1969-05-19
DE
DE19691925422
patent/DE1925422A1/en
active
Pending
1969-05-20
FR
FR6916373A
patent/FR2009923A1/fr
not_active
Withdrawn
Also Published As
Publication number
Publication date
FR2009923A1
(en)
1970-02-13
US3534606A
(en)
1970-10-20
IL32228A
(en)
1973-01-30
IL32228A0
(en)
1969-11-12
SE378908B
(en)
1975-09-15
DE1925422A1
(en)
1970-01-02
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FUEL TYPE
None