GB1287148A - Improvements in or relating to water level detectors - Google Patents

Improvements in or relating to water level detectors

Info

Publication number
GB1287148A
GB1287148A GB2960969A GB2960969A GB1287148A GB 1287148 A GB1287148 A GB 1287148A GB 2960969 A GB2960969 A GB 2960969A GB 2960969 A GB2960969 A GB 2960969A GB 1287148 A GB1287148 A GB 1287148A
Authority
GB
United Kingdom
Prior art keywords
circuit
transistor
water level
actuate
resistors
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.)
Expired
Application number
GB2960969A
Inventor
Frederick Norman Hill
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.)
Thomas Electronics Ltd
Original Assignee
Thomas Electronics Ltd
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 Thomas Electronics Ltd filed Critical Thomas Electronics Ltd
Priority to GB2960969A priority Critical patent/GB1287148A/en
Priority to FR7021466A priority patent/FR2045992B1/fr
Priority to DE19702028833 priority patent/DE2028833C3/en
Publication of GB1287148A publication Critical patent/GB1287148A/en
Priority to ES380614A priority patent/ES380614A1/en
Expired 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
    • G01F23/24—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
    • G01F23/244—Schematic arrangements of probes combined with measuring circuits comprising oscillating circuits

Abstract

1287148 Liquid level indication THOMAS ELECTRONICS Ltd 8 June 1970 [11 June 1969] 29609/69 Addition to 1107000 Heading G1H In a liquid level detector, such as for detecting the alteration from a predetermined level in an engine cooling system, a probe 3 extends into a reservoir 4 and a second detector element is connected to or extends into the reservoir 4 and is in circuit with an oscillator comprising a transistor T 1 , resistors R 1 , R 2 , capacitors C 1 , C 2 , and close coupled air coils L 1 , L 2 and when the water level is at or above the desired minimum the water contacts probe 3 and completes a fast circuit comprising capacitors C 3 , C 4 having an impedance lower than the impedance of a secondary circuit comprising resistors R 3 , R 4 and operating means, across the oscillator output there is a small voltage across R 4 which gives rise to a current in the collector lead of transistor T 3 which is insufficient to actuate an indicator. When the water level falls the first circuit element is open circuited, the voltage across R 3 rises causing an increase in current to the collector lead of transistor T 3 of sufficient magnitude to actuate the indicator 1.
GB2960969A 1969-06-11 1969-06-11 Improvements in or relating to water level detectors Expired GB1287148A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB2960969A GB1287148A (en) 1969-06-11 1969-06-11 Improvements in or relating to water level detectors
FR7021466A FR2045992B1 (en) 1969-06-11 1970-06-11
DE19702028833 DE2028833C3 (en) 1969-06-11 1970-06-11 Level indicator
ES380614A ES380614A1 (en) 1969-06-11 1973-01-20 Improvements in or relating to water level detectors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2960969A GB1287148A (en) 1969-06-11 1969-06-11 Improvements in or relating to water level detectors

Publications (1)

Publication Number Publication Date
GB1287148A true GB1287148A (en) 1972-08-31

Family

ID=10294262

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2960969A Expired GB1287148A (en) 1969-06-11 1969-06-11 Improvements in or relating to water level detectors

Country Status (4)

Country Link
DE (1) DE2028833C3 (en)
ES (1) ES380614A1 (en)
FR (1) FR2045992B1 (en)
GB (1) GB1287148A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169082A (en) * 1984-12-13 1986-07-02 Lin Shang Jing High frequency electrode type low-level alarm for drip-feed injection
US4736638A (en) * 1985-12-20 1988-04-12 Beckman Instruments, Inc. Liquid level sensor
US4912976A (en) * 1987-06-26 1990-04-03 Beckman Instruments, Inc. Liquid level sensing apparatus
US5027075A (en) * 1989-09-18 1991-06-25 Nova Biomedical Corporation Apparatus for determination of probe contact with a liquid surface
GB2241336A (en) * 1988-09-20 1991-08-28 Donald P Dattilo An indicator for a battery sensor
US5550059A (en) * 1994-02-23 1996-08-27 Bayer Corporation Fluid sensing pipette
EP1873500A1 (en) * 2006-06-26 2008-01-02 Miele & Cie. KG Fill level sensor device for a storage container with an outlet for storing an electrically conductible fluid for a domestic appliance

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3902107A1 (en) * 1989-01-25 1990-08-02 Kessler Franz Capacitive filling level and level measuring device
DE10007188A1 (en) * 2000-02-17 2001-08-23 Endress Hauser Gmbh Co Device for determining the level of a medium in a container

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169082A (en) * 1984-12-13 1986-07-02 Lin Shang Jing High frequency electrode type low-level alarm for drip-feed injection
US4736638A (en) * 1985-12-20 1988-04-12 Beckman Instruments, Inc. Liquid level sensor
US4912976A (en) * 1987-06-26 1990-04-03 Beckman Instruments, Inc. Liquid level sensing apparatus
GB2241336A (en) * 1988-09-20 1991-08-28 Donald P Dattilo An indicator for a battery sensor
US5027075A (en) * 1989-09-18 1991-06-25 Nova Biomedical Corporation Apparatus for determination of probe contact with a liquid surface
US5550059A (en) * 1994-02-23 1996-08-27 Bayer Corporation Fluid sensing pipette
EP1873500A1 (en) * 2006-06-26 2008-01-02 Miele & Cie. KG Fill level sensor device for a storage container with an outlet for storing an electrically conductible fluid for a domestic appliance

Also Published As

Publication number Publication date
DE2028833A1 (en) 1971-02-04
DE2028833C3 (en) 1979-12-13
DE2028833B2 (en) 1979-04-26
FR2045992A1 (en) 1971-03-05
ES380614A1 (en) 1973-04-01
FR2045992B1 (en) 1974-09-06

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Legal Events

Date Code Title Description
PS Patent sealed
PE Patent expired