WO2005106818A3 - Liquid level sensor having a virtual ring - Google Patents

Liquid level sensor having a virtual ring Download PDF

Info

Publication number
WO2005106818A3
WO2005106818A3 PCT/US2005/010413 US2005010413W WO2005106818A3 WO 2005106818 A3 WO2005106818 A3 WO 2005106818A3 US 2005010413 W US2005010413 W US 2005010413W WO 2005106818 A3 WO2005106818 A3 WO 2005106818A3
Authority
WO
WIPO (PCT)
Prior art keywords
probe
conductive
residue
sensor
liquid
Prior art date
Application number
PCT/US2005/010413
Other languages
French (fr)
Other versions
WO2005106818A2 (en
Inventor
Edward R Chamberlin
Original Assignee
Standex Int Corp
Edward R Chamberlin
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 Standex Int Corp, Edward R Chamberlin filed Critical Standex Int Corp
Publication of WO2005106818A2 publication Critical patent/WO2005106818A2/en
Publication of WO2005106818A3 publication Critical patent/WO2005106818A3/en

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
    • G01F23/30—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 floats
    • G01F23/64—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 floats of the free float type without mechanical transmission elements
    • G01F23/68—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 floats of the free float type without mechanical transmission elements using electrically actuated indicating means
    • G01F23/683—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 floats of the free float type without mechanical transmission elements using electrically actuated indicating means using electromechanically actuated indicating means
    • 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
    • G01F23/24—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 resistance of resistors due to contact with conductor fluid
    • G01F23/241—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 resistance of resistors due to contact with conductor fluid for discrete levels
    • G01F23/242—Mounting arrangements for electrodes
    • 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
    • G01F23/24—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 resistance of resistors due to contact with conductor fluid
    • G01F23/241—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 resistance of resistors due to contact with conductor fluid for discrete levels
    • G01F23/243—Schematic arrangements of probes combined with measuring circuits

Abstract

A liquid level sensor for conductive liquids having a virtual bias ring to prevent false 'full' indications. The sensor is an inexpensive conductive probe that can be installed in any tank or container used to contain a conductive liquid. The build up of residue such as conductive fluid that fails to drain on the inside of the container wall and probe pieces can cause a short between the probe and ground. This situation will result in falsely showing that the level of the liquid being measured is at least at the minimum predetermined requirement even though the actual level may be far less than that amount. The bias ring is a virtual 'ring' that is provided around the insulating base of the sensing probe between the probe tip and the top inside of the tank. The probe is then given a charge (positive for negative ground systems) which interrupts the current path between the sensing tip of the probe and ground via the conducting residue. Consequently, the sensor will read correctly despite the conductive residue that may be present.
PCT/US2005/010413 2004-04-14 2005-03-29 Liquid level sensor having a virtual ring WO2005106818A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/823,935 US7145465B2 (en) 2002-06-27 2004-04-14 Liquid level sensor having a virtual ring
US10/823,935 2004-04-14

Publications (2)

Publication Number Publication Date
WO2005106818A2 WO2005106818A2 (en) 2005-11-10
WO2005106818A3 true WO2005106818A3 (en) 2006-02-09

Family

ID=35242329

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2005/010413 WO2005106818A2 (en) 2004-04-14 2005-03-29 Liquid level sensor having a virtual ring

Country Status (2)

Country Link
US (1) US7145465B2 (en)
WO (1) WO2005106818A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7161492B2 (en) * 2004-12-02 2007-01-09 Itt Industries Mechanical self-cleaning probe via a jiggler
US8410948B2 (en) * 2008-05-12 2013-04-02 John Vander Horst Recreational vehicle holding tank sensor probe
CN108775947B (en) * 2018-07-10 2020-04-10 广州广日电气设备有限公司 Water level detection method and system for water pan of elevator air conditioner

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5167769A (en) * 1990-11-14 1992-12-01 Pulp And Paper Research Institute Of Canada Particle level sensor
US5907112A (en) * 1995-08-24 1999-05-25 Magnetrol International Inc. Probe secondary seal
US6938478B2 (en) * 2002-11-14 2005-09-06 Herman Diaz Arias Impedance level meter for liquids in tanks

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5167769A (en) * 1990-11-14 1992-12-01 Pulp And Paper Research Institute Of Canada Particle level sensor
US5907112A (en) * 1995-08-24 1999-05-25 Magnetrol International Inc. Probe secondary seal
US6938478B2 (en) * 2002-11-14 2005-09-06 Herman Diaz Arias Impedance level meter for liquids in tanks

Also Published As

Publication number Publication date
WO2005106818A2 (en) 2005-11-10
US7145465B2 (en) 2006-12-05
US20040189478A1 (en) 2004-09-30

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