GB1406873A - Device for monitoring the level of liquid in reservoirs - Google Patents

Device for monitoring the level of liquid in reservoirs

Info

Publication number
GB1406873A
GB1406873A GB3796772A GB3796772A GB1406873A GB 1406873 A GB1406873 A GB 1406873A GB 3796772 A GB3796772 A GB 3796772A GB 3796772 A GB3796772 A GB 3796772A GB 1406873 A GB1406873 A GB 1406873A
Authority
GB
United Kingdom
Prior art keywords
thermistor
liquid
potential
amplifier
junction
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
GB3796772A
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB1406873A publication Critical patent/GB1406873A/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
    • G01F23/246—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 thermal devices
    • G01F23/247—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 thermal devices for discrete levels

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

1406873 Monitoring liquid level ROBERT BOSCH GmbH 15 Aug 1972 [16 Aug 1971] 37967/72 Heading G1N A device for monitoring the level of liquid in a reservoir comprises a first thermistor 12 arranged outside the liquid to be monitored to provide a reference signal, a second thermistor 11 within the reservoir to provide a measuring signal and means for comparing said reference signal and said measuring signal, the first thermistor is arranged above the second in a tubular housing 10 having inlet and outlet and breather ports 17, 18. The thermistors are arranged in a bridge circuit with resistors 20, 22, the bridge imbalance signal being applied via differential amplifier 25 to actuate lamp 43. If the first thermistor 11 is surrounded by liquid the rate of cooling is different from that of the second thermistor 12 in the air whereby the potential or junction 45 drops below that at junction 47, thus the potential at input 24 of the amplifier is less than that at input 30, the output from the amplifier is negative, blocking transistor 41 and extinquishing lamp 43. When the liquid level drops so that both thermistors are in the air, junctions 44, 45 are at the same potential but the potential at junction 47 is lower due to diode 29 and resistors 26, 27 so that amplifier 25 produces a positive output signal enabling transistor 41 and turning on the lamp.
GB3796772A 1971-08-16 1972-08-15 Device for monitoring the level of liquid in reservoirs Expired GB1406873A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712140963 DE2140963B2 (en) 1971-08-16 1971-08-16 DEVICE FOR CHECKING THE LEVEL OF LIQUIDS

Publications (1)

Publication Number Publication Date
GB1406873A true GB1406873A (en) 1975-09-17

Family

ID=5816859

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3796772A Expired GB1406873A (en) 1971-08-16 1972-08-15 Device for monitoring the level of liquid in reservoirs

Country Status (2)

Country Link
DE (1) DE2140963B2 (en)
GB (1) GB1406873A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2718295B2 (en) * 1977-04-25 1981-07-09 Hauser Verwaltungs-Gesellschaft Mbh, 6370 Oberursel Device for measuring the oil level in the crankcase of internal combustion engines
DE3134912C2 (en) * 1981-09-03 1984-05-10 TRW Messmer GmbH & Co KG, 7760 Radolfzell Circuit arrangement for continuous measurement of the fill level in a container at least partially filled with liquid
DE3617536A1 (en) * 1985-06-05 1986-12-11 Vdo Adolf Schindling Ag, 6000 Frankfurt DEVICE FOR ELECTRIC OIL LEVEL MONITORING, IN PARTICULAR IN MOTOR VEHICLE COMBUSTION ENGINES
EP0207238B1 (en) * 1985-06-05 1989-07-19 VDO Adolf Schindling AG Device for electrical oil level control, especially in internal-combustion engines of motor vehicles

Also Published As

Publication number Publication date
DE2140963B2 (en) 1977-12-29
DE2140963A1 (en) 1973-03-01

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Legal Events

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