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WO2000043735A3 - Method and apparatus for measuring fluid levels in vessels - Google Patents

Method and apparatus for measuring fluid levels in vessels Download PDF

Info

Publication number
WO2000043735A3
WO2000043735A3 PCT/US2000/001784 US0001784W WO0043735A3 WO 2000043735 A3 WO2000043735 A3 WO 2000043735A3 US 0001784 W US0001784 W US 0001784W WO 0043735 A3 WO0043735 A3 WO 0043735A3
Authority
WO
WIPO (PCT)
Prior art keywords
capacitance
level
detection
fluid
measurement electronics
Prior art date
Application number
PCT/US2000/001784
Other languages
French (fr)
Other versions
WO2000043735A2 (en
Inventor
Larry Wiese
Eric Weiner
John Mazrum
Robert Walty
Original Assignee
Sgi Internat
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
Application filed by Sgi Internat filed Critical Sgi Internat
Priority to AU29719/00A priority Critical patent/AU2971900A/en
Publication of WO2000043735A2 publication Critical patent/WO2000043735A2/en
Publication of WO2000043735A3 publication Critical patent/WO2000043735A3/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)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)

Abstract

A method and apparatus for measuring fluid levels in storage and process vessels containing multiple levels of components having different dielectric constants. The apparatus includes a capacitance cell having at least two electrodes (30, 32) configured to self-shield at least one of such electrodes; and detection and measurement electronics (22) including a charging circuit for charging the capacitance of the probe (2) to a known voltage, a transfer circuit for transferring charge from the probe to a reference capacitance, a measuring circuit, a processor for calculating level using the measured voltage and pre-set calibration parameters. The level detection and measurement electronics (22) detects the level of a first fluid as a measured capacitance and the presence of a second fluid as a significant change in the measured capacitance. The detection and measurement electronics (22) may include a communication interface for transferring the level to local or remote display (24) and/or data storage.
PCT/US2000/001784 1999-01-21 2000-01-21 Method and apparatus for measuring fluid levels in vessels WO2000043735A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU29719/00A AU2971900A (en) 1999-01-21 2000-01-21 Method and apparatus for measuring fluid levels in vessels

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US23512799A 1999-01-21 1999-01-21
US09/235,127 1999-01-21

Publications (2)

Publication Number Publication Date
WO2000043735A2 WO2000043735A2 (en) 2000-07-27
WO2000043735A3 true WO2000043735A3 (en) 2001-07-26

Family

ID=22884206

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/001784 WO2000043735A2 (en) 1999-01-21 2000-01-21 Method and apparatus for measuring fluid levels in vessels

Country Status (2)

Country Link
AU (1) AU2971900A (en)
WO (1) WO2000043735A2 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1400787A1 (en) * 2002-09-17 2004-03-24 Nanmat Technology Co., Ltd. Method for detecting quantity variation of high purity liquid chemicals and devices to carry out the method
DE10258418A1 (en) * 2002-12-13 2004-07-08 Beru Ag media sensor
DE10324731A1 (en) * 2003-05-31 2004-12-16 Braun Gmbh Method and circuit arrangement for the detection of a filling level of a liquid
DE102008049623A1 (en) 2008-09-30 2010-04-01 Endress + Hauser Gmbh + Co. Kg Method for manufacturing a capacitive measuring device
GB0822415D0 (en) * 2008-12-09 2009-01-14 Denby Carl Storage tank monitoring apparatus
US8549910B2 (en) 2010-01-07 2013-10-08 Federal-Mogul Corporation Fuel system electro-static potential differential level sensor element and hardware/software configuration
US9035800B2 (en) * 2012-10-12 2015-05-19 The Boeing Company Fuel tank monitoring system
WO2014136071A1 (en) * 2013-03-06 2014-09-12 Smart Solutions Limited Fluid monitoring system
CN111867433B (en) * 2018-03-16 2023-07-18 皮特科炸具股份有限公司 Fluid top-up detection and control system
CN113532587A (en) * 2021-08-20 2021-10-22 成都英航威科技有限公司 Sensor for measuring liquid level position in marine fuel tank and working method thereof
WO2022149011A1 (en) * 2021-11-27 2022-07-14 Basiri Salar Liquid level measurement apparatus

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747407A (en) * 1971-11-26 1973-07-24 Consolidated Airborne Syst Inc Probe mounted electronics for fuel gage system
US3863147A (en) * 1973-02-16 1975-01-28 Jensen Iii Owen F Capacitance sensing apparatus
US4296472A (en) * 1979-10-01 1981-10-20 Rockwell International Corporation Non-intrusive fluid measuring system
US4383444A (en) * 1980-04-21 1983-05-17 Robertshaw Controls Company Microprocessor based capacitance level detection system
US4485673A (en) * 1981-05-13 1984-12-04 Drexelbrook Engineering Company Two-wire level measuring instrument
US4547725A (en) * 1980-06-30 1985-10-15 Gebruder Buhler Ag Method and apparatus for the continuous determination of moisture pourable food
US4745895A (en) * 1985-10-15 1988-05-24 Briggs & Stratton Corp. Liquid monitoring apparatus
US5861811A (en) * 1996-04-03 1999-01-19 Lease; Benjamin N. Fluid sensor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747407A (en) * 1971-11-26 1973-07-24 Consolidated Airborne Syst Inc Probe mounted electronics for fuel gage system
US3863147A (en) * 1973-02-16 1975-01-28 Jensen Iii Owen F Capacitance sensing apparatus
US4296472A (en) * 1979-10-01 1981-10-20 Rockwell International Corporation Non-intrusive fluid measuring system
US4383444A (en) * 1980-04-21 1983-05-17 Robertshaw Controls Company Microprocessor based capacitance level detection system
US4547725A (en) * 1980-06-30 1985-10-15 Gebruder Buhler Ag Method and apparatus for the continuous determination of moisture pourable food
US4485673A (en) * 1981-05-13 1984-12-04 Drexelbrook Engineering Company Two-wire level measuring instrument
US4745895A (en) * 1985-10-15 1988-05-24 Briggs & Stratton Corp. Liquid monitoring apparatus
US5861811A (en) * 1996-04-03 1999-01-19 Lease; Benjamin N. Fluid sensor

Also Published As

Publication number Publication date
AU2971900A (en) 2000-08-07
WO2000043735A2 (en) 2000-07-27

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