FR2450446A1 - Flowable medium detector with heater - has two temp.-dependent semiconductor devices of different thermal ranges, from whose differences medium presence is determined - Google Patents

Flowable medium detector with heater - has two temp.-dependent semiconductor devices of different thermal ranges, from whose differences medium presence is determined

Info

Publication number
FR2450446A1
FR2450446A1 FR7931304A FR7931304A FR2450446A1 FR 2450446 A1 FR2450446 A1 FR 2450446A1 FR 7931304 A FR7931304 A FR 7931304A FR 7931304 A FR7931304 A FR 7931304A FR 2450446 A1 FR2450446 A1 FR 2450446A1
Authority
FR
France
Prior art keywords
temp
semiconductor devices
detector
medium
heater
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.)
Granted
Application number
FR7931304A
Other languages
French (fr)
Other versions
FR2450446B1 (en
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.)
Smiths Group PLC
Original Assignee
Smiths Group PLC
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 Smiths Group PLC filed Critical Smiths Group PLC
Publication of FR2450446A1 publication Critical patent/FR2450446A1/en
Application granted granted Critical
Publication of FR2450446B1 publication Critical patent/FR2450446B1/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)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Testing Of Individual Semiconductor Devices (AREA)

Abstract

The first temp.-dependent semiconductor device for the detector is supplied with current sufficient to heat the detector above ambient temp. The device is dipped into the measured medium, which provides a greater temp. gradient. A second semiconductor device for dipping into the measured medium is supplied with a lower current than the first one. Thus its heating effect is lower. The flowable medium is detected by differences between the two semiconductor devices. Pref. the two semiconductor devices are mounted at the same height, relative to the surface of the measured medium so that they are dipped into it, or retracted from it simultaneously. The temp. differences may be used for cutting off the voltage at both semiconductor devices so that the voltage difference may be also used for the detecting process. Typically Zener diodes are used and their anodes are interconnected. The detector finds application in liquid level measurement, or in aircraft height determination.
FR7931304A 1978-12-21 1979-12-20 EQUIPMENT FOR DETECTING THE PRESENCE OF A FLUID, PARTICULARLY IN A TANK Expired FR2450446B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7849472 1978-12-21

Publications (2)

Publication Number Publication Date
FR2450446A1 true FR2450446A1 (en) 1980-09-26
FR2450446B1 FR2450446B1 (en) 1985-08-30

Family

ID=10501861

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7931304A Expired FR2450446B1 (en) 1978-12-21 1979-12-20 EQUIPMENT FOR DETECTING THE PRESENCE OF A FLUID, PARTICULARLY IN A TANK

Country Status (6)

Country Link
DE (1) DE2950762A1 (en)
ES (1) ES8102353A1 (en)
FR (1) FR2450446B1 (en)
IN (1) IN153363B (en)
IT (1) IT1164787B (en)
SE (1) SE444860B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3639435A1 (en) * 1986-11-18 1988-05-26 Hoelter Heinz Volume flow monitoring system for filtering devices
EP0463192A1 (en) * 1990-06-23 1992-01-02 Dieter Bohn Method and device to measure fluid level in liquid containers
DE102017210152A1 (en) * 2017-06-19 2018-12-20 Ab Elektronik Sachsen Gmbh Device for detecting media
DE102017210153A1 (en) 2017-06-19 2018-12-20 Ab Elektronik Sachsen Gmbh Device for level detection of media in containers

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3302458A (en) * 1963-10-09 1967-02-07 American Radiator & Standard Liquid level sensing device
FR2143946A1 (en) * 1971-06-30 1973-02-09 Bosch

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3302458A (en) * 1963-10-09 1967-02-07 American Radiator & Standard Liquid level sensing device
FR2143946A1 (en) * 1971-06-30 1973-02-09 Bosch

Also Published As

Publication number Publication date
FR2450446B1 (en) 1985-08-30
IN153363B (en) 1984-07-07
ES487103A0 (en) 1980-12-16
IT7951124A0 (en) 1979-12-18
IT1164787B (en) 1987-04-15
DE2950762C2 (en) 1988-05-26
ES8102353A1 (en) 1980-12-16
SE444860B (en) 1986-05-12
SE7910503L (en) 1980-06-22
DE2950762A1 (en) 1980-07-03

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