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특허 상세정보

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Capacitance level sensor

특허상세정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) H01H-035/00   
미국특허분류(USC) 307/118 ; 307/125 ; 324/686 ; 324/690 ; 324/689 ; 324/688 ; 340/870.37
출원번호 US-0920293 (1997-08-28)
발명자 / 주소
출원인 / 주소
대리인 / 주소
    Westman, Champlin & Kelly, P.A.
인용정보 피인용 횟수 : 20  인용 특허 : 34
초록

A capacitive level sensor for sensing level of a in a vessel includes a sensor coupled to the vessel having a shield and an inner sensing rod. An oscillator provides an RF signal to the shield and the sensing rod. Comparison circuitry couples to the sensing rod provides a wet/dry output in response to capacitance between the inner sensing rod and the vessel, the capacitance related to the level of the liquid in the vessel.

대표
청구항
▼

[ What is claimed is:] [1.] A capacitive level sensor for sensing level of a liquid in a vessel, comprising:a sensor coupled to the vessel having a shield and an inner sensing rod, the inner sensing rod forming a capacitance with the vessel and wherein a coating can form on the sensor;an oscillator having an enable input and responsively providing an RF output to the shield and the sensing rod and thereby driving the capacitance formed between the rod and the vessel;a pulse source periodically providing an enable signal to the enable input of the oscilla...

이 특허에 인용된 특허 (34)

  1. Maltby Frederick L. (Jenkintown PA) Kramer Jonathan (Warminster PA) Loewenstern Kenneth M. (Warminster PA). Admittance measuring system for monitoring the condition of materials. USP1979034146834.
  2. Maltby Frederick L. (Jenkintown PA) Kramer L. Jonathan (Devon PA) Loewenstern Kenneth M. (Warminster PA). Admittance measuring system for monitoring the condition of materials. USP1976113993947.
  3. Maltby Frederick L. (Jenkintown PA) Kramer L. Jonathan (Warminster PA). Admittance sensing probe having multiple sensing elements. USP1980064208909.
  4. Kuhlman George A. (St. Charles IL). Capacitance level sensor for use with viscous, electrically conductive materials. USP1985054515015.
  5. Eichberger Robert T. (Mt. Clemens MI). Capacitance-type material level indicator. USP1987064676100.
  6. Marsh Norman F. (Port Huron MI) Schutt John R. (Lexington MI) Campbell Bruce W. (Port Huron MI). Capacitance-type material level indicator. USP1991095048335.
  7. Fathauer George H. (Mesa AZ) Hood Charles F. (Mesa AZ). Capacitance-type material level indicator and method of operation. USP1993095245873.
  8. Fleckenstein Phillip P. (Port Huron MI). Capacitance-type material level probe. USP1989034811160.
  9. Fleckenstein, Phillip P.. Capacitance-type material level probe and method of manufacture. USP1985104549245.
  10. Townsend Lawrence B. (Downers Grove IL). Capacitive level sensing device. USP1982094347740.
  11. Davis James E. (Wilmington DE). Capacitive liquid level sensor. USP1990124977786.
  12. Davis James E. (Wilmington DE) Simko Stephen J. (Bear DE). Capacitive liquid level sensor. USP1992015083470.
  13. Rottmar Werner (Loerrach DEX). Capacitive measuring transducer. USP1981014245188.
  14. Franz Hans-Jurgen (Schopfheim DT) Rottmar Werner (Lorrach DT). Capacitive sensor. USP1977054025846.
  15. Kroner, Holger. Capacitive sensor. USP1985114551785.
  16. Schneider Georg (Schopfheim-Langenau DEX) Wagner Richard (Maulburg DEX). Capacitive sensor signal processing arrangement using switch capacitor structures. USP1995095451940.
  17. Kemp William H. (Clayton CAX) Shideler Victor J. (Carleton CAX). Carrier frequency sensing of fluids in vessels. USP1997025600997.
  18. Wetzel Gustav (Lrrach DEX). Circuit arrangement for capacitance or admittance measurement. USP1989054833393.
  19. Maltby Frederick L. (Jenkintown PA) Kramer L. Jonathan (Warminster PA) Petersen Steven R. (Dresher PA). Coating responsive material condition monitoring system. USP1996075539670.
  20. Geiger Wolfgang (Greenwood IN). Control system for a capacitive level sensor. USP1982094347741.
  21. Rauchwerger George P. (Sunnyvale CA). Guarded capacitance probe and related measurement circuit. USP1996085546005.
  22. Wright William S. (Dublin PA) Loewenstern Kenneth M. (Warminster PA). Level measuring system using admittance sensing. USP1980114232300.
  23. Hansen ; III Charles C. (Hinsdale IL) Yencho John A. (Elmhurst IL) Barbier William J. (Hazelwood MO) Knapp Curtis H. (Aurora IL) Kuhn ; Jr. Orval J. (Warrenville IL). Liquid level control system for refrigeration apparatus. USP1989024809129.
  24. Cost Evan (Philadelphia PA). Material level probe having crimp seal. USP1994055307678.
  25. Brenton Ronald G. (Marysville MI) Runck Robin B. (Sherman Oaks CA). Method of manufacturing capacitance-type material level indicator probe. USP1985024499640.
  26. Fleckenstein Phillip P. (Port Huron MI). Method of manufacturing capacitance-type material level indicator probe. USP1985024499641.
  27. Wagner Edward D. (Rogue River OR) Trautwein Richard R. (Rogue River OR). Moisture measuring method and apparatus. USP1987074683418.
  28. Keeler Manley S. (Naperville IL) Margison Steven E. (Downers Grove IL) Carsella ; Jr. Boyce M. (Ingleside IL). Point level switch. USP1992065121632.
  29. Schneider Quentin L. (Downers Grove IL). Point level switch. USP1996025495130.
  30. Maltby Frederick L. (Jenkintown PA) Woerner Edward R. (North Wales PA) Meacham ; Jr. Thomas E. (Holland PA) Petersen Steven R. (Ambler PA). Probe system for measuring the condition of materials. USP1988074757252.
  31. Sun Robert J. (Bala Cynwyd PA) Maltby Frederick L. (Jenkintown PA). RF Admittance measuring method and apparatus for determining the level of a conductive liquid. USP1979094166388.
  32. Russell Craig A. (Elburn IL). Radio frequency capacitance probe system for material detection. USP1990044914377.
  33. Maltby Frederick (Jenkintown PA) Hall Richard G. (Warminster PA) Kramer Jonathan L. (Warminster PA) Hoopes Howard S. (Hatfield PA) Petersen Steven R. (Ambler PA). Remotely calibratable instrument system. USP1988024723122.
  34. Stern David M. (Merion Station PA). Two-wire compensated level measuring instrument. USP1991095049878.

이 특허를 인용한 특허 피인용횟수: 20

  1. Mireles, Pedro G; Almaraz, Jose L. Apparatus and method for detecting tilt and vibration of a body. USP2003116640644.
  2. Dana Alfred. Bilge sentry. USP2001046218948.
  3. Wakabayashi Kazuhiro,JPX. Capacitance type detector. USP2001096292104.
  4. Niel Mazurek. Continuous level measurement for grease separator. USP2002076423213.
  5. Lipscomb, James H.; Jurik, Anna; Katz, Bernard; Keating, Michael J.; Klengler, Stone; Kotlarik, John J.; Wroblewski, Mieczyslaw. Fluid dispense verification system. USP2005026851453.
  6. Lipscomb, James H.; Jurik, Larry; Katz, Bernard; Keating, Michael J.; Klengler, Stone; Kotlarik, John J.; Wroblewski, Mieczyslaw. Fluid transfer system. USP2003126663353.
  7. Calderoni, Anthony. Fluid volume verification system. USP2010097804599.
  8. Estrada, Jesus. Integrated level sensing printed circuit board. USP2017069692411.
  9. Bogdanchik, Peter J.. Level detector for measuring foam and aerated slurry level in a wet flue gas desulfurization absorber tower. USP2014068756992.
  10. Juergen Klattenhoff DE; Guenter Schmitz DE; Holger Schroeter DE. Measuring instrument for fill level sensors. USP2002066404209.
  11. Lundquist Paul Matthew ; Nguyen Son Van ; Singh Manmohanjit. Method and apparatus for in-situ monitoring of ion energy distribution for endpoint detection via capacitance measurement. USP2001126326794.
  12. Gibb, Robert F.. Method and apparatus for sensor calibration and adjustable pump time in a dewatering system. USP2012128330603.
  13. Gibb, Robert F.. Method and apparatus for sensor calibration in a dewatering system. USP2014108869587.
  14. Lipscomb, James H.; Jurik, Anna; Katz, Bernard; Keating, Michael J.; Klengler, Stone; Kotlarik, John J.; Wroblewski, Mieczyslaw. Method of detecting a fluid surface. USP2005076914555.
  15. Lipscomb, James H.; Jurik, Larry; Katz, Bernard; Keating, Michael J.; Klengler, Stone; Kotlarik, John J.; Wroblewski, Mieczyslaw. Method of detecting fluid flow through a conduit. USP2003126658946.
  16. Lipscomb, James H.; Jurik, Larry; Katz, Bernard; Keating, Michael J.; Klengler, Stone; Kotlarik, John J.; Wroblewski, Mieczyslaw. Method of detecting fluid flow through a conduit. USP2003086604054.
  17. Bassissi, Fabio; Galavotti, Giorgio. Packaging machine for continuously producing sealed packages of a pourable food product, and having a capacitive level sensor. USP2004026684609.
  18. Decker, Thomas R.. Sediment monitoring system for stormwater management facilities. USP2014128924167.
  19. MacDonald, Ronald. Submersible water pump having self-contained control circuit. USP2014068760302.
  20. Wallace, Henry B.. Variable capacitance audio cable. USP2012088246384.

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