FR2373038A1 - Emetteur a capacite, a deux fils - Google Patents
Emetteur a capacite, a deux filsInfo
- Publication number
- FR2373038A1 FR2373038A1 FR7736351A FR7736351A FR2373038A1 FR 2373038 A1 FR2373038 A1 FR 2373038A1 FR 7736351 A FR7736351 A FR 7736351A FR 7736351 A FR7736351 A FR 7736351A FR 2373038 A1 FR2373038 A1 FR 2373038A1
- Authority
- FR
- France
- Prior art keywords
- transmitter
- capacitance
- probe
- wire
- reference capacitor
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
L'invention concerne un émetteur à convertisseur de capacité en courant, relié à la source d'alimentation et à un appareil indicateur ou enregistreur par deux fils. Il comporte une sonde à capacité variable et un condensateur de référence. Un discriminateur compare les vitesses de charge de la capacité de la sonde et du condensateur de référence et délivre un courant de sortie qui varie en fonction de la différence entre ces vitesses. L'émetteur comporte également des circuits de réglage de zéro et de déviation totale de l'appareil de mesure associe. L'invention s'applique notamment à des mesures de variables telles que des niveaux, des pressions ou des proximités.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/747,403 US4145619A (en) | 1976-12-03 | 1976-12-03 | Two wire capacitance transmitter |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2373038A1 true FR2373038A1 (fr) | 1978-06-30 |
FR2373038B1 FR2373038B1 (fr) | 1984-03-09 |
Family
ID=25004913
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7736351A Granted FR2373038A1 (fr) | 1976-12-03 | 1977-12-02 | Emetteur a capacite, a deux fils |
Country Status (5)
Country | Link |
---|---|
US (1) | US4145619A (fr) |
JP (1) | JPS6027076B2 (fr) |
DE (1) | DE2753884A1 (fr) |
FR (1) | FR2373038A1 (fr) |
GB (1) | GB1561947A (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1981000620A1 (fr) * | 1979-08-29 | 1981-03-05 | List H | Transducteur de mesure capacitif |
FR2486232A1 (fr) * | 1980-07-01 | 1982-01-08 | Hokushin Electric Works | Dispositif de conversion de deplacement de type capacitif |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE436936B (sv) * | 1981-01-29 | 1985-01-28 | Asea Ab | Integrerad kapacitiv givare |
US4525792A (en) * | 1982-03-29 | 1985-06-25 | Smiths Industries Public Limited Company | Unidirectional capacitive fluid-gauging systems |
US5083091A (en) * | 1986-04-23 | 1992-01-21 | Rosemount, Inc. | Charged balanced feedback measurement circuit |
US4791352A (en) * | 1986-07-17 | 1988-12-13 | Rosemount Inc. | Transmitter with vernier measurement |
US4783659A (en) * | 1986-08-22 | 1988-11-08 | Rosemount Inc. | Analog transducer circuit with digital control |
US4748852A (en) * | 1986-10-10 | 1988-06-07 | Rosemount Inc. | Transmitter with an improved span adjustment |
US5135485A (en) * | 1991-02-25 | 1992-08-04 | Louis Cohen | Capacitance-type fluid level sensor for i.v. and catheter bags |
US5485092A (en) * | 1991-08-01 | 1996-01-16 | Fortin; Gabriel | Method and device for electrostatically investigating surface and sub-surface structures |
US5237285A (en) * | 1991-10-18 | 1993-08-17 | Rosemount Inc. | Method and apparatus for capacitance temperature compensation and manufacturability in a dual plate capacitive pressure transmitter |
US5838241A (en) * | 1996-12-18 | 1998-11-17 | Robertshaw Controls Company | Liquid level transmitter |
US6516672B2 (en) | 2001-05-21 | 2003-02-11 | Rosemount Inc. | Sigma-delta analog to digital converter for capacitive pressure sensor and process transmitter |
GB0121418D0 (en) * | 2001-09-04 | 2001-10-24 | Smiths Group Plc | Capacitance measuring systems |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3543046A (en) * | 1969-04-14 | 1970-11-24 | Fisher Governor Co | Capacitance-measuring techniques |
FR2205669A1 (fr) * | 1972-11-03 | 1974-05-31 | Robertshaw Controls Co |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3482234A (en) * | 1965-06-22 | 1969-12-02 | Bendix Corp | Signal comparator for minimizing nuisance failure alarms |
US3555534A (en) * | 1967-03-10 | 1971-01-12 | North American Rockwell | Proximity detector with a sensing probe |
FR1526273A (fr) * | 1967-04-13 | 1968-05-24 | Schlumberger Instrumentation | Dispositif pour la mesure des condensateurs électriques |
US3612997A (en) * | 1970-02-18 | 1971-10-12 | John Paulkovich | Capacitor apparatus including a reference capacitor for controlling the current flow through a capacitance being measured |
US3829850A (en) * | 1971-12-17 | 1974-08-13 | Tyco Laboratories Inc | Proximity detector |
-
1976
- 1976-12-03 US US05/747,403 patent/US4145619A/en not_active Expired - Lifetime
-
1977
- 1977-12-02 FR FR7736351A patent/FR2373038A1/fr active Granted
- 1977-12-02 JP JP52144912A patent/JPS6027076B2/ja not_active Expired
- 1977-12-02 GB GB50369/77A patent/GB1561947A/en not_active Expired
- 1977-12-02 DE DE19772753884 patent/DE2753884A1/de not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3543046A (en) * | 1969-04-14 | 1970-11-24 | Fisher Governor Co | Capacitance-measuring techniques |
FR2205669A1 (fr) * | 1972-11-03 | 1974-05-31 | Robertshaw Controls Co |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1981000620A1 (fr) * | 1979-08-29 | 1981-03-05 | List H | Transducteur de mesure capacitif |
EP0025029A1 (fr) * | 1979-08-29 | 1981-03-11 | List, Hans | Dispositif de pont de mesure capacitif |
US4481465A (en) * | 1979-08-29 | 1984-11-06 | Hans List | Capacitive measuring transducer |
FR2486232A1 (fr) * | 1980-07-01 | 1982-01-08 | Hokushin Electric Works | Dispositif de conversion de deplacement de type capacitif |
Also Published As
Publication number | Publication date |
---|---|
GB1561947A (en) | 1980-03-05 |
JPS6027076B2 (ja) | 1985-06-27 |
JPS5370853A (en) | 1978-06-23 |
DE2753884A1 (de) | 1978-06-08 |
US4145619A (en) | 1979-03-20 |
FR2373038B1 (fr) | 1984-03-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |