CA2423781A1 - Method for sensing a predetermined level of a material, and device therefor - Google Patents

Method for sensing a predetermined level of a material, and device therefor Download PDF

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Publication number
CA2423781A1
CA2423781A1 CA002423781A CA2423781A CA2423781A1 CA 2423781 A1 CA2423781 A1 CA 2423781A1 CA 002423781 A CA002423781 A CA 002423781A CA 2423781 A CA2423781 A CA 2423781A CA 2423781 A1 CA2423781 A1 CA 2423781A1
Authority
CA
Canada
Prior art keywords
rods
sensing
predetermined level
device therefor
limit state
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
CA002423781A
Other languages
French (fr)
Other versions
CA2423781C (en
Inventor
Herrmann Best
Markus Hertel
Michael Kessler
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.)
Endress and Hauser SE and Co KG
Original Assignee
Endress + Hauser Gmbh + Co. Kg
Herrmann Best
Markus Hertel
Michael Kessler
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
Priority claimed from DE20016962U external-priority patent/DE20016962U1/en
Application filed by Endress + Hauser Gmbh + Co. Kg, Herrmann Best, Markus Hertel, Michael Kessler filed Critical Endress + Hauser Gmbh + Co. Kg
Publication of CA2423781A1 publication Critical patent/CA2423781A1/en
Application granted granted Critical
Publication of CA2423781C publication Critical patent/CA2423781C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G01F23/28—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 the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G01F23/2845—Electromagnetic waves for discrete levels

Abstract

The invention relates to a method and device for detecting the limit state o f a material having a given dielectric constant. To this end, the invention us es a holding device, inside of which two electrically conductive rods are arranged. When a limit state is attained, said rods are immersed into the material to be monitored and are connected to an electric circuit. Said circuit generates high-frequency transmit pulses, which are fed to the rods via the line according to the principle of time-domain reflectometry. The signals reflected into the air by the boundary layer of the material are evaluated on the basis of their waveform.
CA002423781A 2000-09-27 2001-09-19 Method for sensing a predetermined level of a material, and device therefor Expired - Fee Related CA2423781C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE20016962.9 2000-09-27
DE20016962U DE20016962U1 (en) 2000-09-27 2000-09-27 Time-domain reflectometer for use as a limit switch to record the limit level of a good
DE10115150.0 2001-03-27
DE10115150A DE10115150A1 (en) 2000-09-27 2001-03-27 Process for detecting the limit level of a good and device therefor
PCT/EP2001/010813 WO2002027349A2 (en) 2000-09-27 2001-09-19 Method for detecting the limit state of a material, and device therefor

Publications (2)

Publication Number Publication Date
CA2423781A1 true CA2423781A1 (en) 2003-03-26
CA2423781C CA2423781C (en) 2009-02-24

Family

ID=26008927

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002423781A Expired - Fee Related CA2423781C (en) 2000-09-27 2001-09-19 Method for sensing a predetermined level of a material, and device therefor

Country Status (6)

Country Link
EP (1) EP1322922A2 (en)
JP (1) JP2004519661A (en)
CN (1) CN1250944C (en)
AU (1) AU2002218183A1 (en)
CA (1) CA2423781C (en)
WO (1) WO2002027349A2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7639176B2 (en) 2005-11-30 2009-12-29 Vega Grieshaber Kg Reference pulse generation
US20110214502A1 (en) * 2008-12-06 2011-09-08 Jingdong Zhang Level
US8276443B2 (en) 2007-02-08 2012-10-02 Krohne Messetechnik GmbH & Co. KG Method of using a level meter employing the radar principle
US10704948B2 (en) 2016-06-14 2020-07-07 Vega Grieshaber Kg Reflection microwave barrier

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10360711A1 (en) 2003-12-19 2005-07-14 Endress + Hauser Gmbh + Co. Kg Level measuring device and method for level measurement and monitoring
CN102735313B (en) * 2012-06-19 2014-07-30 郭云昌 Method for determining middle material level curve of continuous passive nuclear material level gage
DE102014103212A1 (en) * 2014-03-11 2015-09-17 Sick Ag Sensor and method for detecting an object located on a roller conveyor
DE102015100415A1 (en) * 2015-01-13 2016-07-14 Krohne Messtechnik Gmbh Device for determining the level of a medium
DE102015100417A1 (en) * 2015-01-13 2016-07-14 Krohne Messtechnik Gmbh Method for determining the level of a medium in a container
HUE036364T2 (en) * 2015-02-03 2018-07-30 Grieshaber Vega Kg Limit level switch with integrated position sensor
DE102015202448A1 (en) * 2015-02-11 2016-08-11 Vega Grieshaber Kg Evaluation procedure for a TDR limit switch
JP6716791B2 (en) 2016-11-11 2020-07-01 レオニ カーベル ゲーエムベーハー Method and measuring device for monitoring conductors
EP3527959B1 (en) * 2018-02-14 2023-11-08 VEGA Grieshaber KG Fill level radar with adhesion detector
DE102021201364A1 (en) * 2021-02-12 2022-08-18 Vega Grieshaber Kg Measuring device with position sensor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4407369C2 (en) * 1994-03-05 1999-09-30 Grieshaber Vega Kg Method and circuit arrangement for measuring the transit time and their use
US5884231A (en) * 1995-12-21 1999-03-16 Endress & Hauser Gmbh & Co. Processor apparatus and method for a process measurement signal
US6085589A (en) * 1996-12-23 2000-07-11 Venture Measurement Company Llc Material level sensing system calibration
US5943908A (en) * 1997-09-08 1999-08-31 Teleflex Incorporated Probe for sensing fluid level
EP1128169A1 (en) * 1999-12-29 2001-08-29 Endress + Hauser GmbH + Co. Method and apparatus for determining a limit filling level of a product in a container

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7639176B2 (en) 2005-11-30 2009-12-29 Vega Grieshaber Kg Reference pulse generation
US8276443B2 (en) 2007-02-08 2012-10-02 Krohne Messetechnik GmbH & Co. KG Method of using a level meter employing the radar principle
US20110214502A1 (en) * 2008-12-06 2011-09-08 Jingdong Zhang Level
US10704948B2 (en) 2016-06-14 2020-07-07 Vega Grieshaber Kg Reflection microwave barrier

Also Published As

Publication number Publication date
CA2423781C (en) 2009-02-24
WO2002027349A3 (en) 2002-10-24
JP2004519661A (en) 2004-07-02
EP1322922A2 (en) 2003-07-02
CN1250944C (en) 2006-04-12
WO2002027349A2 (en) 2002-04-04
AU2002218183A1 (en) 2002-04-08
CN1466674A (en) 2004-01-07

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