DE69423078T2 - Prüfschaltung für einen kapazitiven Schwellwertdetektor - Google Patents

Prüfschaltung für einen kapazitiven Schwellwertdetektor

Info

Publication number
DE69423078T2
DE69423078T2 DE69423078T DE69423078T DE69423078T2 DE 69423078 T2 DE69423078 T2 DE 69423078T2 DE 69423078 T DE69423078 T DE 69423078T DE 69423078 T DE69423078 T DE 69423078T DE 69423078 T2 DE69423078 T2 DE 69423078T2
Authority
DE
Germany
Prior art keywords
test circuit
threshold detector
capacitive threshold
capacitive
detector
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 - Fee Related
Application number
DE69423078T
Other languages
English (en)
Other versions
DE69423078D1 (de
Inventor
Benjamin N Lease
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.)
Robertshaw Controls Co
Original Assignee
Robertshaw Controls Co
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 Robertshaw Controls Co filed Critical Robertshaw Controls Co
Publication of DE69423078D1 publication Critical patent/DE69423078D1/de
Application granted granted Critical
Publication of DE69423078T2 publication Critical patent/DE69423078T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G01F23/265—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 for discrete levels
    • 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
    • G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
    • G01F25/24—Testing proper functioning of electronic circuits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
    • G01R31/2829—Testing of circuits in sensor or actuator systems

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Level Indicators Using A Float (AREA)
DE69423078T 1993-12-17 1994-12-07 Prüfschaltung für einen kapazitiven Schwellwertdetektor Expired - Fee Related DE69423078T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/169,340 US5446444A (en) 1993-12-17 1993-12-17 Capacitive threshold detector test circuit

Publications (2)

Publication Number Publication Date
DE69423078D1 DE69423078D1 (de) 2000-03-30
DE69423078T2 true DE69423078T2 (de) 2000-07-13

Family

ID=22615261

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69423078T Expired - Fee Related DE69423078T2 (de) 1993-12-17 1994-12-07 Prüfschaltung für einen kapazitiven Schwellwertdetektor

Country Status (6)

Country Link
US (1) US5446444A (de)
EP (1) EP0658748B1 (de)
JP (1) JPH07260550A (de)
CA (1) CA2137531A1 (de)
DE (1) DE69423078T2 (de)
RU (1) RU94044338A (de)

Families Citing this family (31)

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US5585733A (en) * 1992-09-10 1996-12-17 David Sarnoff Research Center Capacitive sensor and method of measuring changes in capacitance
US5461321A (en) * 1993-09-17 1995-10-24 Penberthy, Inc. Apparatus and method for measuring capacitance from the duration of a charge-discharge charge cycle
US5719556A (en) * 1995-05-22 1998-02-17 Albin; Robert Liquid level sensor utilizing AC and resistance
WO1997037198A1 (en) * 1996-04-03 1997-10-09 Robertshaw Controls Company Fluid sensor
US5838241A (en) * 1996-12-18 1998-11-17 Robertshaw Controls Company Liquid level transmitter
US5945831A (en) * 1997-06-10 1999-08-31 Sargent; John S. Volume charge density measuring system
TW422215U (en) * 1998-10-22 2001-02-11 Ohu Hee Bum Water dispenser for upright stand type water bottles
US6904800B2 (en) * 2001-05-24 2005-06-14 Potter Electric Signal Company Low-water cut-off system
US7243540B2 (en) * 2001-05-24 2007-07-17 Potter Electric Signal Company Low-water cut-off system
KR200272968Y1 (ko) * 2002-01-30 2002-04-20 김홍배 가정용 두유,순두부,두부 제조장치의 물없음 감지경보장치
KR100499377B1 (ko) 2003-05-27 2005-07-05 김홍배 가정용 두유두부제조기의 스팀 공급장치
KR200329861Y1 (ko) * 2003-07-24 2003-10-10 김홍배 가정용 두유 두부 제조기의 과열 방지장치
KR200331665Y1 (ko) * 2003-08-06 2003-10-30 김홍배 가정용 두유 두부 제조기의 가열 제어장치
KR200336989Y1 (ko) 2003-09-17 2004-01-03 김홍배 가정용 두유두부 제조기의 모터 체결력 보강장치
US20080053316A1 (en) * 2003-10-08 2008-03-06 Hong-Bae Kim Household bean milk and bean curd maker closed by gravity
KR200338467Y1 (ko) * 2003-10-08 2004-01-16 김홍배 가정용 두유 두부 제조기의 손잡이 겸용 록킹장치
KR200338468Y1 (ko) * 2003-10-08 2004-01-16 김홍배 가정용 두유 두부 제조기의 에어 벤트장치
KR200338466Y1 (ko) * 2003-10-08 2004-01-16 김홍배 가정용 두유 두부 제조기의 대용량 스위치를 이용한일차측 전원 차단장치
US20090000494A1 (en) * 2003-10-08 2009-01-01 Hong-Bae Kim Household soybean milk and tofu maker
KR200338469Y1 (ko) * 2003-10-08 2004-01-16 김홍배 자중결합 기능을 갖는 가정용 두유 두부 제조기
KR200338530Y1 (ko) * 2003-10-14 2004-01-16 김홍배 가정용 두유 두부 제조기의 실리콘 팩킹 결합 장치
AU2006254863B2 (en) * 2005-06-08 2011-06-30 Lumenite Control Technology Inc. Self-calibrating liquid level transmitter
DE102006011239B3 (de) * 2006-03-10 2007-10-11 Infineon Technologies Ag Sensorschaltung zum Messen einer Messgröße
US7317993B2 (en) * 2006-03-15 2008-01-08 Potter Electric Signal Company Fluid detector recognizing foam and surge conditions
DE202006013335U1 (de) * 2006-08-30 2008-01-03 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Coburg Einklemmschutzvorrichtung
KR20080086078A (ko) * 2007-03-21 2008-09-25 삼성전자주식회사 잉크젯 화상형성장치의 잉크 레벨 검출장치 및 그 제어방법
US8936444B2 (en) * 2007-12-07 2015-01-20 Pentair Flow Technologies, Llc Capacitive liquid level sensor
CH702180B1 (de) 2009-11-02 2015-02-13 Tecan Trading Ag Verfahren zum Testen eines Laborgeräts und entsprechendes Laborgerät.
CN102818958B (zh) * 2012-08-22 2014-11-12 山东惠工电气股份有限公司 变电站并联补偿电容器组的在线监测方法及其装置
US9400201B1 (en) * 2013-02-20 2016-07-26 Aub N. Ward Rising water alarms
DE102015122284A1 (de) * 2015-12-18 2017-06-22 Endress + Hauser Gmbh + Co. Kg Elektronikeinheit mit Diagnosefunktion

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3811051A (en) * 1972-11-03 1974-05-14 Robertshaw Controls Co Capacitance responsive detector system
US4224606A (en) * 1979-03-21 1980-09-23 Honeywell Inc. Fluid level detector test switch
US4214479A (en) * 1979-05-21 1980-07-29 Simmonds Precision Products, Inc. Capacitive type fuel probe compensation circuit
US4573040A (en) * 1979-11-30 1986-02-25 Drexelbrook Engineering Company Fail-safe instrument system
DE3029352C2 (de) * 1980-08-01 1982-12-23 Endress U. Hauser Gmbh U. Co, 7867 Maulburg Kapazitive Füllstandsmeßanordnung mit einer stabförmigen Sonde für die Messung des Füllstandes in einem Behälter
JPS57114822A (en) * 1981-01-09 1982-07-16 Nissan Motor Co Ltd Electrostatic capacity type dosimeter
US4555941A (en) * 1982-08-25 1985-12-03 Berwind Corporation Capacitance-type material level indicator
US4515015A (en) * 1983-02-16 1985-05-07 Magnetrol International, Incorporated Capacitance level sensor for use with viscous, electrically conductive materials
US4528839A (en) * 1984-04-27 1985-07-16 The Foxboro Company Transfer calibration system
US4676100A (en) * 1984-10-31 1987-06-30 Berwind Corporation Capacitance-type material level indicator
US4684931A (en) * 1985-05-14 1987-08-04 Sydney Parks Capacitive sensing security system
US4914377A (en) * 1988-08-25 1990-04-03 Ludlow Industries, Inc. Radio frequency capacitance probe system for material detection
US5034722A (en) * 1990-01-16 1991-07-23 Joshua Premack Capacitance detection system
US5121632A (en) * 1991-01-03 1992-06-16 Magnetrol International, Incorporated Point level switch
EP0494398B2 (de) * 1991-01-09 1999-07-28 Bindicator Company Materialpegelanzeiger mit einem Lichtzustandsanzeiger und externen Prüfgeräten

Also Published As

Publication number Publication date
RU94044338A (ru) 1996-10-10
CA2137531A1 (en) 1995-06-18
DE69423078D1 (de) 2000-03-30
EP0658748B1 (de) 2000-02-23
EP0658748A2 (de) 1995-06-21
EP0658748A3 (de) 1996-02-28
JPH07260550A (ja) 1995-10-13
US5446444A (en) 1995-08-29

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee