WO2000026619A1 - Procede pour mesurer le niveau d'une substance liquide dans un recipient - Google Patents

Procede pour mesurer le niveau d'une substance liquide dans un recipient Download PDF

Info

Publication number
WO2000026619A1
WO2000026619A1 PCT/EP1999/007284 EP9907284W WO0026619A1 WO 2000026619 A1 WO2000026619 A1 WO 2000026619A1 EP 9907284 W EP9907284 W EP 9907284W WO 0026619 A1 WO0026619 A1 WO 0026619A1
Authority
WO
WIPO (PCT)
Prior art keywords
fill level
capacitor arrangement
level
medium
dielectric
Prior art date
Application number
PCT/EP1999/007284
Other languages
German (de)
English (en)
Inventor
Eckhard Irion
Gerhard SCHÖRG
Original Assignee
Daimlerchrysler 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 Daimlerchrysler Ag filed Critical Daimlerchrysler Ag
Publication of WO2000026619A1 publication Critical patent/WO2000026619A1/fr

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
    • G01F23/268—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 mounting arrangements of probes
    • 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

Definitions

  • the invention relates to a method for measuring the full level of a liquid medium acting as a dielectric for a capacitor arrangement in a container according to the preamble of claim 1 and to the use for a capacitive full level measuring arrangement with at least two capacitor arrangements arranged one above the other
  • a significant disadvantage of the prior art is that when the level falls below a known level, usually the specified minimum level, the level measurement becomes extremely imprecise and fails, since the second capacitor arrangement, which serves as a reference value for determining the current dielectric level, now also depends on the level
  • the object of the invention is to provide a method for level measurement by which a measurement below the level is quite possible with simple means. This object is achieved by the characterizing features of claim 1.
  • Claim 2 teaches an advantageous use of this method for a capacitive level measurement arrangement at least two capacitor arrangements arranged one above the other
  • the level below the fullness mark can be recognized and that the dielectric level is used to determine the current fill level below this fullness mark, which was last determined at a fill level above this full level the fullness mark of this fullness mark will change undetected, however this change is negligible compared to the errors that have arisen up to now due to the incomplete filling of the second capacitor arrangement.
  • Significant changes in the dielectric capacity occur in particular through the refilling of the container, in which a medium that is possibly very different in the dielectric capacity is filled different dielectric quotas on the refill, however, the fill level is usually exceeded again and the determination of the current value of the dielectric quotas possible
  • the method is extremely simple to implement, since, for example, an additional register for the value of the dielectric mark is only required, in which the current value of the dielectric mark is preferably stored permanently before the level falls below the mark, or at least immediately before or when the mark falls below the mark
  • the first capacitor arrangement preferably extends over the entire, but at least over a part of the full height of the medium 1 in the container 2 and is partially filled with the medium 1 according to the current fill level.
  • the second capacitor arrangement C2 serves as Reference value for determining the current dielectric constant of the medium 1 and is therefore completely filled with the medium 1 up to the fullness mark ho. If the current fill level falls below this fullness mark ho, for example sketched as hook 2 in FIG.
  • C2 is also only partially removed from the medium 1 filled the
  • the capacitance of the second capacitor arrangement is thus also dependent on the current fill level Reason is used to determine a current fill level hook 1 of the medium 1 which has dropped below the known fill level mark ho.
  • the value of the dielectric quotient that was last used at a fill level above this fill level mark ho, for example hook 2 or exactly at ho, could thus be deactivated 02 until the current level rises above the level ho
  • the first capacitor arrangement no longer detects the medium 1 below the full level mark ho and therefore a full level measurement at 01 is no longer possible.
  • the second capacitor arrangement 02 below this full level mark ho is hooked at a current fill level i Below this level ho, however, is only partially filled by the medium 1.
  • the fill level can now be derived from the capacitance of the second capacitor arrangement 02. If the current fill level rises again above this fill level mark ho, for example to hook 2, then the first capacitor arrangement 01 again detect the fill level of the medium 1 and the second capacitor arrangement 02 again correctly supply the reference value
  • FIG. 3 now additionally shows a possible fullness monitoring circuit 7, which in normal operation shows the two signals above the fullness mark
  • This level monitoring 7 in FIG. 3 is designed for the capacitor arrangement in FIG. 1, but could easily be adapted for the capacitor arrangement in FIG. 2, for example by an additional switch of the first input of the comparator 6 from 01 to 02, which is synchronous with the switch 5 works from 02 to 00.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

L'invention vise à mettre au point un procédé permettant de mesurer des niveaux de remplissage. Ce procédé doit permettre d'effectuer des mesures précises avec des moyens simples, en dessous des repères de niveau. L'invention se caractérise à cet égard en ce que la mesure du niveau de remplissage permet d'identifier le passage du niveau en dessous des repères et que pour déterminer le niveau de remplissage du moment, même en dessous de ces repères de niveau, on peut utiliser la valeur de diélectricité qui a été déterminée en dernier lieu pour un niveau de remplissage se trouvant au-dessus ou en dessous de ces repères de niveau. Ce procédé s'utilise pour un système de mesure de niveau capacitif, où au moins un deuxième système de condensateur est disposé en dessous du premier système de condensateur et par conséquent en dessous des repères connus de niveau.
PCT/EP1999/007284 1998-10-31 1999-10-01 Procede pour mesurer le niveau d'une substance liquide dans un recipient WO2000026619A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998150247 DE19850247C1 (de) 1998-10-31 1998-10-31 Verfahren zur Füllstandsmessung eines als Dielektrium für eine Kondensatoranordnung wirkenden flüssigen Mediums in einem Behältnis
DE19850247.8 1998-10-31

Publications (1)

Publication Number Publication Date
WO2000026619A1 true WO2000026619A1 (fr) 2000-05-11

Family

ID=7886270

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/007284 WO2000026619A1 (fr) 1998-10-31 1999-10-01 Procede pour mesurer le niveau d'une substance liquide dans un recipient

Country Status (2)

Country Link
DE (1) DE19850247C1 (fr)
WO (1) WO2000026619A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10119555A1 (de) * 2001-04-21 2002-10-31 Siemens Ag Füllstandssensor und Verfahren zur Erfassung eines Füllstandes in einem Behälter
WO2007127793A1 (fr) * 2006-04-27 2007-11-08 Honeywell International Inc. Detecteur de la qualite et du niveau d'un liquide
WO2008049913A1 (fr) * 2006-10-26 2008-05-02 Inergy Automotive Systems Research (Société Anonyme) Procédé permettant de mesurer un niveau de liquide dans un réservoir et système associé
FR2907896A1 (fr) * 2006-10-26 2008-05-02 Inergy Automotive Systems Res Procede de mesure d'un niveau de liquide dans un reservoir et systeme associe
CN102997974A (zh) * 2012-12-24 2013-03-27 电子科技大学 一种自适应式电容液位计
EP4134637A1 (fr) 2021-08-09 2023-02-15 Rechner Industrie-Elektronik GmbH Sonde capacitive de niveau de remplissage sans zone morte

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10309769B4 (de) * 2002-03-08 2017-10-05 Ust Umweltsensortechnik Gmbh Anordnung zur Bestimmung von Zustandsgrößen für Flüssigkeiten in einem geschlossenen nichtmetallischen Behälter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0040107A1 (fr) * 1980-05-14 1981-11-18 Honeywell Inc. Système de mesure d'un liquide combustible
US5049878A (en) * 1981-05-13 1991-09-17 Drexelbrook Engineering Company Two-wire compensated level measuring instrument

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5138880A (en) * 1991-05-29 1992-08-18 Lee/Maatuk Engineering, Inc. Digital level sensing probe system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0040107A1 (fr) * 1980-05-14 1981-11-18 Honeywell Inc. Système de mesure d'un liquide combustible
US5049878A (en) * 1981-05-13 1991-09-17 Drexelbrook Engineering Company Two-wire compensated level measuring instrument

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10119555A1 (de) * 2001-04-21 2002-10-31 Siemens Ag Füllstandssensor und Verfahren zur Erfassung eines Füllstandes in einem Behälter
US6622557B2 (en) 2001-04-21 2003-09-23 Siemens Aktiengesellschaft Level sensor and method of registering a level in a container
DE10119555B4 (de) * 2001-04-21 2005-03-03 Siemens Ag Füllstandssensor zur Erfassung eines Füllstandes in einem Behälter
WO2007127793A1 (fr) * 2006-04-27 2007-11-08 Honeywell International Inc. Detecteur de la qualite et du niveau d'un liquide
WO2008049913A1 (fr) * 2006-10-26 2008-05-02 Inergy Automotive Systems Research (Société Anonyme) Procédé permettant de mesurer un niveau de liquide dans un réservoir et système associé
FR2907896A1 (fr) * 2006-10-26 2008-05-02 Inergy Automotive Systems Res Procede de mesure d'un niveau de liquide dans un reservoir et systeme associe
US8181516B2 (en) 2006-10-26 2012-05-22 Inergy Automotive Systems Research (Societe Anonyme) Measuring a liquid level in a tank with two measurement capacitors and two reference capacitors
CN102997974A (zh) * 2012-12-24 2013-03-27 电子科技大学 一种自适应式电容液位计
CN102997974B (zh) * 2012-12-24 2014-12-10 电子科技大学 一种自适应式电容液位计
EP4134637A1 (fr) 2021-08-09 2023-02-15 Rechner Industrie-Elektronik GmbH Sonde capacitive de niveau de remplissage sans zone morte

Also Published As

Publication number Publication date
DE19850247C1 (de) 2001-07-05

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