FR2383436A1 - METHOD AND DEVICE FOR MONITORING OR MEASURING THE LEVEL OF A FLUID BY MEANS OF THE CAPACITY OF A MEASURING PROBE SUBMERTED IN THE FLUID - Google Patents

METHOD AND DEVICE FOR MONITORING OR MEASURING THE LEVEL OF A FLUID BY MEANS OF THE CAPACITY OF A MEASURING PROBE SUBMERTED IN THE FLUID

Info

Publication number
FR2383436A1
FR2383436A1 FR7807076A FR7807076A FR2383436A1 FR 2383436 A1 FR2383436 A1 FR 2383436A1 FR 7807076 A FR7807076 A FR 7807076A FR 7807076 A FR7807076 A FR 7807076A FR 2383436 A1 FR2383436 A1 FR 2383436A1
Authority
FR
France
Prior art keywords
fluid
measuring
switching stages
time switching
gate
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
Application number
FR7807076A
Other languages
French (fr)
Other versions
FR2383436B1 (en
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.)
HELIOS AG
Original Assignee
HELIOS 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 HELIOS AG filed Critical HELIOS AG
Publication of FR2383436A1 publication Critical patent/FR2383436A1/en
Application granted granted Critical
Publication of FR2383436B1 publication Critical patent/FR2383436B1/fr
Granted 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
    • G01F23/266—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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96—Touch switches
    • H03K2217/9607—Capacitive touch switches
    • H03K2217/96071—Capacitive touch switches characterised by the detection principle
    • H03K2217/96072—Phase comparison, i.e. where a phase comparator receives at one input the signal directly from the oscillator, at a second input the same signal but delayed, with a delay depending on a sensing capacitance

Abstract

Two monostable time switching stages (1, 2) are connected with a level setting capacitor (Cp) and the measurement probe (Cs) as time-determining capacitances and are triggered periodically, at a rhythm of 300 kHz, by a repeater stage (8). Connected to the two time switching stages is a subtraction stage (3) which triggers a retriggerable monostable multivibrator (6) as long as the probe capacitance (Cs) is less than that of the level setting capacitor (Cp). If the probe capacitance is greater than that of the level setting capacitor, the multivibrator (6) is no longer triggered and, when it returns to its stable state, triggers an alarm (9, 10) via an AND gate (5). A failure indication, which consists of an AND gate (4) (which is connected to the two time switching stages) and a further retriggerable monostable multivibrator (7), likewise triggers the alarm (9, 10), via the AND gate (5), if the time switching stages (1, 2) fail or the repeater stage (8) fails.
FR7807076A 1977-03-11 1978-03-10 METHOD AND DEVICE FOR MONITORING OR MEASURING THE LEVEL OF A FLUID BY MEANS OF THE CAPACITY OF A MEASURING PROBE SUBMERTED IN THE FLUID Granted FR2383436A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH306077A CH610658A5 (en) 1977-03-11 1977-03-11 Method and device for monitoring or measuring a level

Publications (2)

Publication Number Publication Date
FR2383436A1 true FR2383436A1 (en) 1978-10-06
FR2383436B1 FR2383436B1 (en) 1982-06-18

Family

ID=4247711

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7807076A Granted FR2383436A1 (en) 1977-03-11 1978-03-10 METHOD AND DEVICE FOR MONITORING OR MEASURING THE LEVEL OF A FLUID BY MEANS OF THE CAPACITY OF A MEASURING PROBE SUBMERTED IN THE FLUID

Country Status (3)

Country Link
CH (1) CH610658A5 (en)
DE (1) DE2809340A1 (en)
FR (1) FR2383436A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2464481A1 (en) * 1979-09-01 1981-03-06 Ferranti Ltd CAPACITY MEASURING APPARATUS
EP0303874A1 (en) * 1987-07-31 1989-02-22 FIAT AUTO S.p.A. Device for measuring the quantity of liquid contained in a tank
EP1862806A1 (en) 2006-06-01 2007-12-05 Electrolux Home Products Corporation N.V. Method and device for measuring the capacitance of a capacitive component
JP2008275428A (en) * 2006-05-26 2008-11-13 Fujikura Ltd Proximity detection sensor and proximity detection method
EP1860776A3 (en) * 2006-05-26 2010-08-11 Fujikura Ltd. Proximity sensor and proximity sensing method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1131315B (en) * 1980-06-13 1986-06-18 Logic Spa DETECTION AND SIGNALING SYSTEM OF THE FUEL QUANTITY CONTAINED IN A VEHICLE TANK, ESPECIALLY OF AIR VEHICLES
DE3902107A1 (en) * 1989-01-25 1990-08-02 Kessler Franz Capacitive filling level and level measuring device
DE19728280C2 (en) * 1996-11-21 2001-12-20 Alfred Haupt Capacitance probe and associated evaluation circuit
DE10023850B4 (en) * 2000-05-16 2005-02-10 Alfred Haupt Capacitive measuring system with automatic compensation of the cable length and the cable-related temperature error in a continuous capacitive level measurement
DE10324731A1 (en) 2003-05-31 2004-12-16 Braun Gmbh Method and circuit arrangement for the detection of a filling level of a liquid

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2464481A1 (en) * 1979-09-01 1981-03-06 Ferranti Ltd CAPACITY MEASURING APPARATUS
EP0303874A1 (en) * 1987-07-31 1989-02-22 FIAT AUTO S.p.A. Device for measuring the quantity of liquid contained in a tank
US4935727A (en) * 1987-07-31 1990-06-19 Fiat Auto S.P.A. Device for measuring the quantity of liquid contained in a tank
JP2008275428A (en) * 2006-05-26 2008-11-13 Fujikura Ltd Proximity detection sensor and proximity detection method
EP1860776A3 (en) * 2006-05-26 2010-08-11 Fujikura Ltd. Proximity sensor and proximity sensing method
EP1862806A1 (en) 2006-06-01 2007-12-05 Electrolux Home Products Corporation N.V. Method and device for measuring the capacitance of a capacitive component
US8030950B2 (en) 2006-06-01 2011-10-04 Electrolux Home Products Corporation N.V. Method and device for measuring the capacitance of a capacitive component
EP1862806B1 (en) * 2006-06-01 2017-08-09 Electrolux Home Products Corporation N.V. Method and device for measuring the capacitance of a capacitive component

Also Published As

Publication number Publication date
DE2809340A1 (en) 1978-09-21
CH610658A5 (en) 1979-04-30
FR2383436B1 (en) 1982-06-18

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