WO2006123141A3 - Capacitive liquid level sensor - Google Patents

Capacitive liquid level sensor Download PDF

Info

Publication number
WO2006123141A3
WO2006123141A3 PCT/GB2006/001815 GB2006001815W WO2006123141A3 WO 2006123141 A3 WO2006123141 A3 WO 2006123141A3 GB 2006001815 W GB2006001815 W GB 2006001815W WO 2006123141 A3 WO2006123141 A3 WO 2006123141A3
Authority
WO
WIPO (PCT)
Prior art keywords
signals
circuitry
excitation
electrodes
liquid level
Prior art date
Application number
PCT/GB2006/001815
Other languages
French (fr)
Other versions
WO2006123141A2 (en
Inventor
Victor Evgenievich Zhitomirsky
Original Assignee
Scient Generics Ltd
Victor Evgenievich Zhitomirsky
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.)
Filing date
Publication date
Priority claimed from PCT/GB2005/001863 external-priority patent/WO2005111551A1/en
Application filed by Scient Generics Ltd, Victor Evgenievich Zhitomirsky filed Critical Scient Generics Ltd
Publication of WO2006123141A2 publication Critical patent/WO2006123141A2/en
Publication of WO2006123141A3 publication Critical patent/WO2006123141A3/en

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
    • G01F23/266—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
    • G01F23/268—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 mounting arrangements of probes

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)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

A capacitive position sensor is provided having a plurality of electrodes spaced along a measurement path. Excitation circuitry is provided to generate and apply excitation signals to some of those electrodes and detection circuitry is provided to receive and process signals obtained from others of the electrodes. The detection circuitry includes circuitry to subtract some of the detection signals from each other to remove common mode signals. In a preferred embodiment, the excitation circuitry is operable to apply said excitation signals to curved electrodes that are arranged along said measurement path.
PCT/GB2006/001815 2005-05-16 2006-05-16 Capacitive liquid level sensor WO2006123141A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/GB2005/001863 WO2005111551A1 (en) 2004-05-14 2005-05-16 Capacitive position sensor
GBPCT/GB2005/001863 2005-05-16

Publications (2)

Publication Number Publication Date
WO2006123141A2 WO2006123141A2 (en) 2006-11-23
WO2006123141A3 true WO2006123141A3 (en) 2007-01-25

Family

ID=37114372

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2006/001815 WO2006123141A2 (en) 2005-05-16 2006-05-16 Capacitive liquid level sensor

Country Status (1)

Country Link
WO (1) WO2006123141A2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8710827B2 (en) 2008-03-19 2014-04-29 Sagentia Limited Processing circuitry for use with a position sensor
DE102013005963A1 (en) * 2013-04-09 2014-10-09 Balluff Gmbh Capacitive level sensor
DE102014113545A1 (en) * 2014-09-19 2016-03-24 Endress + Hauser Gmbh + Co. Kg Device and method for monitoring a process variable of a medium
GB2531291B (en) * 2014-10-14 2019-12-04 Aspen Pumps Ltd Liquid level detector
CN111829613A (en) 2019-04-22 2020-10-27 密克罗奇普技术公司 Bipolar mutual capacitance liquid sensing
FR3096774B1 (en) * 2019-05-27 2021-05-28 Kapflex Capacitive measurement sensor integrated into the wall
US11668595B1 (en) * 2021-09-10 2023-06-06 Consolidated Nuclear Security, LLC Fluid level and conductivity sensor for high temperature applications
JP7032013B1 (en) * 2021-10-14 2022-03-08 幸明 斉藤 Capacitance measuring device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB505447A (en) * 1936-11-27 1939-05-10 Siemens App Und Maschinen Gmbh Improvements in or relating to measuring devices for determining the quantity of liquid in a container mounted on an unstable base
GB581596A (en) * 1945-02-07 1946-10-17 Paul Goudime Levkovitsch Improvements relating to liquid level gauges
US2996915A (en) * 1959-02-12 1961-08-22 Thomas L Greenwood Liquid level measurement system
WO2005111551A1 (en) * 2004-05-14 2005-11-24 Scientific Generics Ltd. Capacitive position sensor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB505447A (en) * 1936-11-27 1939-05-10 Siemens App Und Maschinen Gmbh Improvements in or relating to measuring devices for determining the quantity of liquid in a container mounted on an unstable base
GB581596A (en) * 1945-02-07 1946-10-17 Paul Goudime Levkovitsch Improvements relating to liquid level gauges
US2996915A (en) * 1959-02-12 1961-08-22 Thomas L Greenwood Liquid level measurement system
WO2005111551A1 (en) * 2004-05-14 2005-11-24 Scientific Generics Ltd. Capacitive position sensor

Also Published As

Publication number Publication date
WO2006123141A2 (en) 2006-11-23

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