DE3767477D1 - Stromkreis fuer eine kapazitiven fuehler. - Google Patents

Stromkreis fuer eine kapazitiven fuehler.

Info

Publication number
DE3767477D1
DE3767477D1 DE8787901075T DE3767477T DE3767477D1 DE 3767477 D1 DE3767477 D1 DE 3767477D1 DE 8787901075 T DE8787901075 T DE 8787901075T DE 3767477 T DE3767477 T DE 3767477T DE 3767477 D1 DE3767477 D1 DE 3767477D1
Authority
DE
Germany
Prior art keywords
circuit
capacitive sensor
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 - Lifetime
Application number
DE8787901075T
Other languages
English (en)
Inventor
John Gimson
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.)
Mestra AG
Original Assignee
Mestra AG
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 Mestra AG filed Critical Mestra AG
Application granted granted Critical
Publication of DE3767477D1 publication Critical patent/DE3767477D1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/228—Circuits therefor

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
DE8787901075T 1986-02-04 1987-01-30 Stromkreis fuer eine kapazitiven fuehler. Expired - Lifetime DE3767477D1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB868602742A GB8602742D0 (en) 1986-02-04 1986-02-04 Capacitive sensor circuit
PCT/GB1987/000064 WO1987004792A1 (en) 1986-02-04 1987-01-30 Capacitive sensor circuit

Publications (1)

Publication Number Publication Date
DE3767477D1 true DE3767477D1 (de) 1991-02-21

Family

ID=10592500

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8787901075T Expired - Lifetime DE3767477D1 (de) 1986-02-04 1987-01-30 Stromkreis fuer eine kapazitiven fuehler.

Country Status (5)

Country Link
US (1) US4887023A (de)
EP (1) EP0291508B1 (de)
DE (1) DE3767477D1 (de)
GB (2) GB8602742D0 (de)
WO (1) WO1987004792A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5033293A (en) * 1990-03-09 1991-07-23 Calsonic Corporation Alcohol concentration detecting device
DE59008731D1 (de) * 1990-08-30 1995-04-20 Siemens Ag Vorrichtung zum Feststellen des Alkoholgehaltes oder des Heizwertes eines Gemischs.
US5224769A (en) * 1992-01-03 1993-07-06 University Of Florida Method and device for non-invasive monitoring of hydration state of plants
GB2364777B (en) * 2000-07-12 2004-10-13 Sondex Ltd An improved capacitance measurement probe
DE102007003887A1 (de) * 2007-01-19 2008-07-24 Endress + Hauser Gmbh + Co. Kg Verfahren zur Bedienung einer Vorrichtung zur kapazitiven Bestimmung und/oder Überwachung einer Prozessgröße
US8997548B2 (en) * 2013-01-29 2015-04-07 Reno Technologies, Inc. Apparatus and method for automatic detection of diaphragm coating or surface contamination for capacitance diaphragm gauges

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2599583A (en) * 1946-11-15 1952-06-10 Petrolite Corp Method and apparatus for testing suspensions
US3047797A (en) * 1958-07-23 1962-07-31 Shell Oil Co Measuring conductivity of liquids
US3502970A (en) * 1967-10-06 1970-03-24 Patrick T Thayer Apparatus having filter screen for detecting particles in a fluid stream
US3694742A (en) * 1970-07-15 1972-09-26 Karlis Alfredovich Bergmanis Device for measuring permittivity of materials
US3860882A (en) * 1971-05-10 1975-01-14 Drexelbrook Controls Continuous condition measuring system
US3808523A (en) * 1972-11-15 1974-04-30 Shell Oil Co Conductivity monitor
US4451894A (en) * 1980-05-14 1984-05-29 Honeywell Inc. Liquid gaging system multiplexing
GB2094004B (en) * 1980-08-23 1984-05-02 Smiths Industries Ltd Fluid-gauging systems
DE3143114A1 (de) * 1980-11-07 1982-07-15 Mestra AG, 4153 Reinach Verfahren und schaltung zur messung von kapazitaeten
DE3231995C2 (de) * 1982-08-27 1985-06-27 Endress U. Hauser Gmbh U. Co, 7867 Maulburg Verfahren und Anordnung zum Messen der Verschmutzung eines kapazitiven Taupunktsensors

Also Published As

Publication number Publication date
GB2206972A (en) 1989-01-18
GB8602742D0 (en) 1986-03-12
EP0291508B1 (de) 1991-01-16
WO1987004792A1 (en) 1987-08-13
GB8816846D0 (en) 1988-09-21
GB2206972B (en) 1989-12-13
EP0291508A1 (de) 1988-11-23
US4887023A (en) 1989-12-12

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Legal Events

Date Code Title Description
8328 Change in the person/name/address of the agent

Free format text: MORSTADT, V., DIPL.-ING., PAT.-ASS., 7800 FREIBURG

8364 No opposition during term of opposition