FR2247021A1 - - Google Patents

Info

Publication number
FR2247021A1
FR2247021A1 FR7433682A FR7433682A FR2247021A1 FR 2247021 A1 FR2247021 A1 FR 2247021A1 FR 7433682 A FR7433682 A FR 7433682A FR 7433682 A FR7433682 A FR 7433682A FR 2247021 A1 FR2247021 A1 FR 2247021A1
Authority
FR
France
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.)
Withdrawn
Application number
FR7433682A
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of FR2247021A1 publication Critical patent/FR2247021A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/023—Generators characterised by the type of circuit or by the means used for producing pulses by the use of differential amplifiers or comparators, with internal or external positive feedback
    • H03K3/0231—Astable circuits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/22—Measuring resistance of fluids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/72—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using ultrasonic, sonic or infrasonic waves
FR7433682A 1973-10-09 1974-10-07 Withdrawn FR2247021A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US404563A US3906353A (en) 1973-10-09 1973-10-09 Oscillator circuit for providing a conductivity ratio of sea water

Publications (1)

Publication Number Publication Date
FR2247021A1 true FR2247021A1 (fr) 1975-05-02

Family

ID=23600112

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7433682A Withdrawn FR2247021A1 (fr) 1973-10-09 1974-10-07

Country Status (6)

Country Link
US (1) US3906353A (fr)
JP (1) JPS5067060A (fr)
CA (1) CA1006919A (fr)
DE (1) DE2447826A1 (fr)
FR (1) FR2247021A1 (fr)
GB (1) GB1454486A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2328201A1 (fr) * 1975-10-13 1977-05-13 Sandoz Sa Sonde pour la mesure de la conductibilite et/ou de la concentration de solutions
FR2466760A1 (fr) * 1979-10-03 1981-04-10 Bosch Gmbh Robert Dispositif de montage a analogie de frequence pour indicateur de temperature

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4253064A (en) * 1978-06-02 1981-02-24 Texas Instruments Incorporated Liquid level sensing system
US4275352A (en) * 1979-03-05 1981-06-23 Canadian Patents & Dev. Ltd. Sea water conductivity cell
US4585996A (en) * 1983-05-27 1986-04-29 Lockheed Missiles & Space Company, Inc. Instrument for measuring electrical conductivity of a liquid
CA1227247A (fr) * 1985-02-05 1987-09-22 Thomas M. Dauphinee Circuit pour mesurer la conductivite des liquides
LU87124A1 (de) * 1988-02-03 1989-09-20 Euratom Vorrichtung zur messung der impedanz eines mediums entlang einer messstrecke
US4928065A (en) * 1989-03-31 1990-05-22 E. I. Du Pont De Nemours And Company Voltammetry in low-permitivity suspensions
US5266899A (en) * 1992-01-31 1993-11-30 Akzo N.V. Salt analyzer switchably capable of employing contact and non-contact conductivity probes
US5260663A (en) * 1992-07-14 1993-11-09 Anatel Corporation Methods and circuits for measuring the conductivity of solutions
US5528133A (en) * 1994-07-21 1996-06-18 Powerpoint Technologies, Inc. Method and apparatus for determining the quality of a colloidal suspension
US5677190A (en) * 1994-12-14 1997-10-14 Anatel Corporation Cell and circuit for monitoring photochemical reactions
JP3558741B2 (ja) * 1995-06-28 2004-08-25 株式会社鶴見精機 電気伝導度測定回路及び電気伝導度測定用プロ−ブ
US5708363A (en) * 1995-10-16 1998-01-13 Signet Scientific Company Liquid conductivity measurement system using a variable-frequency AC voltage
WO1998014789A1 (fr) * 1996-10-03 1998-04-09 Ysi Incorporated Dispositif et procede servant a mesurer la conductivite
US6456903B1 (en) * 1998-04-07 2002-09-24 Envirofoam Technologies, Inc. Automatic foam solution regulation for compressed-air-foam-systems
US6404204B1 (en) * 2000-05-01 2002-06-11 ARETé ASSOCIATES Sensor and sensor system for liquid conductivity, temperature and depth
US6451613B1 (en) * 2000-09-06 2002-09-17 Anatel Corporation Instruments for measuring the total organic carbon content of water
CN100339718C (zh) * 2005-06-24 2007-09-26 浙江大学 工作频率可调的液体电导测量装置
CN103728498B (zh) * 2013-10-29 2015-12-02 高玉琴 一种电导率/频率转换电路
US9344070B2 (en) * 2014-01-27 2016-05-17 Texas Instruments Incorporated Relaxation oscillator with low drift and native offset cancellation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358223A (en) * 1955-10-14 1967-12-12 Mawdsley S Ltd Concentration meter
US3392348A (en) * 1967-04-19 1968-07-09 Gordon Eng Co Oscillator frequency control
US3736528A (en) * 1971-11-24 1973-05-29 Honeywell Inf Systems Voltage controlled oscillator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2328201A1 (fr) * 1975-10-13 1977-05-13 Sandoz Sa Sonde pour la mesure de la conductibilite et/ou de la concentration de solutions
FR2466760A1 (fr) * 1979-10-03 1981-04-10 Bosch Gmbh Robert Dispositif de montage a analogie de frequence pour indicateur de temperature

Also Published As

Publication number Publication date
JPS5067060A (fr) 1975-06-05
US3906353A (en) 1975-09-16
GB1454486A (en) 1976-11-03
CA1006919A (en) 1977-03-15
DE2447826A1 (de) 1975-04-10

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Legal Events

Date Code Title Description
ST Notification of lapse