DE3172226D1 - Capacitive level sensor and method of controlling a capacitive level sensor - Google Patents

Capacitive level sensor and method of controlling a capacitive level sensor

Info

Publication number
DE3172226D1
DE3172226D1 DE8181104922T DE3172226T DE3172226D1 DE 3172226 D1 DE3172226 D1 DE 3172226D1 DE 8181104922 T DE8181104922 T DE 8181104922T DE 3172226 T DE3172226 T DE 3172226T DE 3172226 D1 DE3172226 D1 DE 3172226D1
Authority
DE
Germany
Prior art keywords
level sensor
capacitive level
controlling
capacitive
sensor
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
Application number
DE8181104922T
Other languages
English (en)
Inventor
Wolfgang Geiger
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.)
Endress and Hauser SE and Co KG
Original Assignee
Endress and Hauser SE and Co KG
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 Endress and Hauser SE and Co KG filed Critical Endress and Hauser SE and Co KG
Application granted granted Critical
Publication of DE3172226D1 publication Critical patent/DE3172226D1/de
Expired legal-status Critical Current

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

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 Resistance Or Impedance (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Electronic Switches (AREA)
DE8181104922T 1980-07-17 1981-06-25 Capacitive level sensor and method of controlling a capacitive level sensor Expired DE3172226D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/169,835 US4347741A (en) 1980-07-17 1980-07-17 Control system for a capacitive level sensor

Publications (1)

Publication Number Publication Date
DE3172226D1 true DE3172226D1 (en) 1985-10-17

Family

ID=22617378

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8181104922T Expired DE3172226D1 (en) 1980-07-17 1981-06-25 Capacitive level sensor and method of controlling a capacitive level sensor

Country Status (3)

Country Link
US (1) US4347741A (de)
EP (1) EP0044434B1 (de)
DE (1) DE3172226D1 (de)

Families Citing this family (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4472968A (en) * 1981-11-11 1984-09-25 Smiths Industries Public Limited Company Capacitive fluid-gauging probes and systems
US4503383A (en) * 1982-01-07 1985-03-05 Agar Corporation, N.V. Device for detecting an interface between two fluids
AU571446B2 (en) * 1982-08-25 1988-04-21 Venture Measurement Company Llc Self calibrating capacitance level sensor
US4515015A (en) * 1983-02-16 1985-05-07 Magnetrol International, Incorporated Capacitance level sensor for use with viscous, electrically conductive materials
EP0175362A3 (de) * 1984-09-19 1988-12-07 Omron Tateisi Electronics Co. Detektorvorrichtung des kapazitiven Typs
US4589281A (en) * 1984-09-20 1986-05-20 Keystone International, Inc. Material level detector and control
US4676100A (en) * 1984-10-31 1987-06-30 Berwind Corporation Capacitance-type material level indicator
GB2169082A (en) * 1984-12-13 1986-07-02 Lin Shang Jing High frequency electrode type low-level alarm for drip-feed injection
AT397718B (de) * 1986-09-17 1994-06-27 Avl Verbrennungskraft Messtech Niveau-messgerät für elektrisch nicht leitende flüssigkeiten
US4806848A (en) * 1987-03-11 1989-02-21 The United States Of America As Represented By The Secretary Of The Air Force Compressor blade clearance measurement system
US4987776A (en) * 1988-03-16 1991-01-29 Koon Terry D Level indicator
US4914377A (en) * 1988-08-25 1990-04-03 Ludlow Industries, Inc. Radio frequency capacitance probe system for material detection
US5182545A (en) * 1989-01-06 1993-01-26 Standex International Corporation Fluid level sensor having capacitive sensor
US5121632A (en) * 1991-01-03 1992-06-16 Magnetrol International, Incorporated Point level switch
JPH0697246B2 (ja) * 1991-07-25 1994-11-30 株式会社ジャルコ Ｐｌｌ回路を用いた浮遊容量の変化検出方法
DE4301116A1 (de) * 1993-01-18 1994-07-21 Kneer Franz X Verfahren zum mikrobiologischen Abbau von organischen Abfällen
US5539323A (en) * 1993-05-07 1996-07-23 Brooks Automation, Inc. Sensor for articles such as wafers on end effector
US5627304A (en) * 1994-05-23 1997-05-06 Smiths Industries System for automatic real-time calibration of remotely-located capacitive-type fuel quantity measurement probes
US5546005A (en) * 1995-01-09 1996-08-13 Flowline Inc. Guarded capacitance probe and related measurement circuit
US5973415A (en) * 1997-08-28 1999-10-26 Kay-Ray/Sensall, Inc. Capacitance level sensor
ES2132034B1 (es) * 1997-11-19 2000-03-01 Grifols Grupo Sa Dispositivo para la manipulacion y deteccion de nivel de liquidos.
AR017411A1 (es) 1997-11-19 2001-09-05 Grifols Sa Aparato para la realizacion automatica de pruebas de laboratorio
DE19756159C1 (de) * 1997-12-17 1999-06-02 Hiss Eckart Sensor zur Erfassung des Vorhandenseins elektrisch isolierender Flüssigkeiten oder Granulate
US6307385B1 (en) 1997-12-30 2001-10-23 Vibrosystm, Inc. Capacitance measuring circuit for a capacitive sensor
US6446012B1 (en) * 1999-06-23 2002-09-03 Bfcs Technology, Inc. Proximity detector for hard-to-detect materials
EP1067368A1 (de) * 1999-07-08 2001-01-10 HELIOS AG Niveaumessung und Wägetechnik Pegelstandsmessvorrichtung
JP4717312B2 (ja) 2000-02-29 2011-07-06 ジェン−プローブ・インコーポレイテッド 流体搬送プローブ
US6925398B2 (en) * 2003-07-07 2005-08-02 Colorado Vnet, Llc Water measurement apparatus and methods
JP4437699B2 (ja) * 2004-05-14 2010-03-24 富士通マイクロエレクトロニクス株式会社 センサ
US7222526B2 (en) * 2004-06-17 2007-05-29 Ortho-Clinical Diagnostics, Inc Liquid measurements using capacitive monitoring
DE102005051794A1 (de) * 2005-10-27 2007-05-03 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur kapazitiven Bestimmung und/oder Überwachung des Füllstands eines Mediums
JP2007187509A (ja) * 2006-01-12 2007-07-26 Denso Corp 容量式物理量センサ
WO2009046545A1 (en) * 2007-10-11 2009-04-16 Cube Investments Limited Capacitive probes and sensors, and applications therefor, and multimode wireless devices
US20090198458A1 (en) * 2008-01-29 2009-08-06 Mcdermid John Water measurement auto-networks
US7804599B2 (en) * 2008-07-24 2010-09-28 MGM Instruments, Inc. Fluid volume verification system
DE102010038535A1 (de) * 2010-07-28 2012-02-02 Endress + Hauser Gmbh + Co. Kg Vorrichtung zur Bestimmung und/oder Überwachung eines vorgegebenen Füllstands
CN104061981A (zh) * 2013-03-18 2014-09-24 鸿富锦精密工业(武汉)有限公司 水位检测系统
US20160003663A1 (en) * 2014-07-03 2016-01-07 Texas Instruments Incorporated Capacitive liquid level measurement with differential out-of-phase channel drive to counteract human body capacitance

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3119266A (en) * 1960-11-10 1964-01-28 Duane E Atkinson Level indicating system, method and probe
US3706980A (en) * 1970-04-27 1972-12-19 Drexelbrook Controls Rf system for measuring the level of materials
US3781672A (en) * 1971-05-10 1973-12-25 Drexelbrook Controls Continuous condition measuring system
US3918306A (en) * 1974-03-15 1975-11-11 Drexelbrook Controls System for measuring fluid levels in a vehicle transmission
US3993947A (en) * 1974-09-19 1976-11-23 Drexelbrook Controls, Inc. Admittance measuring system for monitoring the condition of materials
US4145927A (en) * 1977-11-10 1979-03-27 Larson Roger G Apparatus for determining the liquid level in a tank
US4208909A (en) * 1978-11-24 1980-06-24 Drexelbrook Controls, Inc. Admittance sensing probe having multiple sensing elements

Also Published As

Publication number Publication date
EP0044434A1 (de) 1982-01-27
EP0044434B1 (de) 1985-09-11
US4347741A (en) 1982-09-07

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: ENDRESS + HAUSER GMBH + CO, 79689 MAULBURG, DE