WO2001081876A3 - System for detecting a liquid level - Google Patents

System for detecting a liquid level Download PDF

Info

Publication number
WO2001081876A3
WO2001081876A3 PCT/DE2001/001410 DE0101410W WO0181876A3 WO 2001081876 A3 WO2001081876 A3 WO 2001081876A3 DE 0101410 W DE0101410 W DE 0101410W WO 0181876 A3 WO0181876 A3 WO 0181876A3
Authority
WO
WIPO (PCT)
Prior art keywords
electrodes
liquid level
detecting
liquid
timer
Prior art date
Application number
PCT/DE2001/001410
Other languages
German (de)
French (fr)
Other versions
WO2001081876A2 (en
Inventor
La Azuela Julian De
Sanchez David Ortiz
Original Assignee
Bosch Gmbh Robert
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 Bosch Gmbh Robert filed Critical Bosch Gmbh Robert
Publication of WO2001081876A2 publication Critical patent/WO2001081876A2/en
Publication of WO2001081876A3 publication Critical patent/WO2001081876A3/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
    • G01F23/22—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
    • 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

Abstract

The invention relates to a system for detecting a liquid level, wherein the electrodes (2, 3) of a sensor (S) are disposed in the area of the liquid level to be monitored and the electrodes (2, 3) are linked with an electronic evaluation circuit by which the change of resistance that occurs between the electrodes (2, 3) when they contact the liquid is convertible to an evaluation signal. A circuit element (Q1; Q2) signals that the level is surpassed, the sensor (S) being connected to the circuit element (Q1; Q2) together with a timer (R2, C1) so that when the supply current (U) for the evaluation circuit is switched on in an interval predetermined by means of the timer (R2, C1), a signal is output even when the electrodes (2, 3) do not contact the liquid.
PCT/DE2001/001410 2000-04-22 2001-04-10 System for detecting a liquid level WO2001081876A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000120081 DE10020081A1 (en) 2000-04-22 2000-04-22 Water level sensor for car fuel filters, has self test function through simple time delay circuit
DE10020081.8 2000-04-22

Publications (2)

Publication Number Publication Date
WO2001081876A2 WO2001081876A2 (en) 2001-11-01
WO2001081876A3 true WO2001081876A3 (en) 2002-03-07

Family

ID=7639779

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2001/001410 WO2001081876A2 (en) 2000-04-22 2001-04-10 System for detecting a liquid level

Country Status (2)

Country Link
DE (1) DE10020081A1 (en)
WO (1) WO2001081876A2 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3668630A (en) * 1970-06-22 1972-06-06 Ford Motor Co Low liquid level indicator
US4356480A (en) * 1980-09-11 1982-10-26 Minnesota Mining And Manufacturing Company Liquid level sensing circuitry
US4367462A (en) * 1981-01-05 1983-01-04 Minnesota Mining And Manufacturing Company Liquid level sensing circuitry
US5239203A (en) * 1990-03-30 1993-08-24 Texand Corporation Common ground control switch for an irrigation system
DE4313404A1 (en) * 1992-05-13 1993-11-18 Spirax Sarco Ltd Data transmitter for condensation traps
US5755105A (en) * 1996-02-20 1998-05-26 Lacoste; Marvin Air conditioning system fluid level controller

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5727550Y2 (en) * 1979-01-10 1982-06-16
JPH0752113B2 (en) * 1990-05-08 1995-06-05 株式会社村田製作所 Liquid level sensor
DE4017314A1 (en) * 1990-05-30 1991-12-05 Twl Hydrokultur Gmbh Liquid level indicator for plant container - has contacts at minimum and maximum levels with immersion detection circuit operated for defined period by pushbutton
DE4424240C2 (en) * 1993-12-10 1995-11-02 Telefunken Microelectron Circuit arrangement with a display instrument
JPH1114663A (en) * 1997-06-27 1999-01-22 Mitsubishi Electric Corp Sensor for physical quantity

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3668630A (en) * 1970-06-22 1972-06-06 Ford Motor Co Low liquid level indicator
US4356480A (en) * 1980-09-11 1982-10-26 Minnesota Mining And Manufacturing Company Liquid level sensing circuitry
US4367462A (en) * 1981-01-05 1983-01-04 Minnesota Mining And Manufacturing Company Liquid level sensing circuitry
US5239203A (en) * 1990-03-30 1993-08-24 Texand Corporation Common ground control switch for an irrigation system
DE4313404A1 (en) * 1992-05-13 1993-11-18 Spirax Sarco Ltd Data transmitter for condensation traps
US5755105A (en) * 1996-02-20 1998-05-26 Lacoste; Marvin Air conditioning system fluid level controller

Also Published As

Publication number Publication date
WO2001081876A2 (en) 2001-11-01
DE10020081A1 (en) 2001-10-25

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