GB1393738A - Quantity level gauge - Google Patents

Quantity level gauge

Info

Publication number
GB1393738A
GB1393738A GB4840672A GB4840672A GB1393738A GB 1393738 A GB1393738 A GB 1393738A GB 4840672 A GB4840672 A GB 4840672A GB 4840672 A GB4840672 A GB 4840672A GB 1393738 A GB1393738 A GB 1393738A
Authority
GB
United Kingdom
Prior art keywords
voltage
tank
level
full
lamp
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
GB4840672A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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
Priority claimed from AU44059/72A external-priority patent/AU472344B2/en
Priority claimed from AU47756/72A external-priority patent/AU483695B2/en
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1393738A publication Critical patent/GB1393738A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • 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
    • G01F23/28—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
    • G01F23/292—Light, e.g. infrared or ultraviolet
    • G01F23/2921—Light, e.g. infrared or ultraviolet for discrete levels
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/40—Arrangements for displaying electric variables or waveforms using modulation of a light beam otherwise than by mechanical displacement, e.g. by Kerr effect
    • G01R13/404—Arrangements for displaying electric variables or waveforms using modulation of a light beam otherwise than by mechanical displacement, e.g. by Kerr effect for discontinuous display, i.e. display of discrete values
    • G01R13/405—Arrangements for displaying electric variables or waveforms using modulation of a light beam otherwise than by mechanical displacement, e.g. by Kerr effect for discontinuous display, i.e. display of discrete values using a plurality of active, i.e. light emitting, e.g. electro-luminescent elements, i.e. bar graphs
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/14—Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Level Indicators Using A Float (AREA)

Abstract

1393738 Digital level gauge PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 20 Oct 1972 [25 Oct 1971 12 Nov 1971 29 June 1972 13 Oct 1972] 48406/72 Heading G4H A quantity level guage has a plurality of light emitting indicators, each responding to a different level and means to vary the intensity of at least one indicator in dependence on the level. The quantity is expressed as a voltage and this is applied to a plurality of voltage comparators, each with a different reference voltage and each associated with one of the light-emitting indicators. The embodiment described is a vehicle fuel gauge. Variable resistors 6, 7 operated by a float in the fuel tank provides a base emitter voltage to TR1 from the power supply (1 is positive), as TR1 conducts a voltage proportional to the level in the tank is generated across emitter resistor 3. This voltage is applied to the bases of transistors TR2, TR4, TR5 and TR6 which have lamps 8, 9, 10, 11 respectively connected between their collectors and the positive-rail and the base and emitter resistor and the diodes where appropriate are arranged such that each transistor conducts sufficiently to light the associated lamp brightly at a different predetermined voltage. For example, lamp 8 may be at the desired brightness when the tank is one quarter full, with intensity reducing to zero when the tank is empty. Similarly lamp 9 may be at full brightness with a half-full tank and zero brightness at the quarter-full position. Generator G produces an intermittent voltage which will cause lamp 8 to flash from the intensity determined by TR2 base voltage to full brightness-this flashing becoming more noticeable as the tank level nears zero. This flashing may be applied to any or all of the lamps. The lamps may be connected via a decoding circuit so that only one lights at a time. A circuit with a time constant of 1-10 seconds or hysteresis circuit may be used to damp out fluctuations in input voltage.
GB4840672A 1971-10-25 1972-10-20 Quantity level gauge Expired GB1393738A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AU676571 1971-10-25
AU700271 1971-11-12
AU44059/72A AU472344B2 (en) 1972-06-29 1972-06-29 An improved quantity level gauge
AU47756/72A AU483695B2 (en) 1972-10-13 1972-10-13 an IMPROVED QUANTITY LEVEL GUAGE

Publications (1)

Publication Number Publication Date
GB1393738A true GB1393738A (en) 1975-05-14

Family

ID=27422391

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4840672A Expired GB1393738A (en) 1971-10-25 1972-10-20 Quantity level gauge

Country Status (4)

Country Link
DE (1) DE2251822A1 (en)
FR (1) FR2158967A5 (en)
GB (1) GB1393738A (en)
NL (1) NL7214297A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0017453A1 (en) * 1979-04-02 1980-10-15 Eaton Corporation Washing appliance and liquid level sensing means therefor
EP2295991B1 (en) * 2009-09-07 2017-08-02 VEGA Grieshaber KG Bar graph display device

Also Published As

Publication number Publication date
NL7214297A (en) 1973-04-27
DE2251822A1 (en) 1973-05-03
FR2158967A5 (en) 1973-06-15

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee