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WO1998039623A1 - Sonde et capteur pour liquides - Google Patents

Sonde et capteur pour liquides Download PDF

Info

Publication number
WO1998039623A1
WO1998039623A1 PCT/GB1998/000667 GB9800667W WO9839623A1 WO 1998039623 A1 WO1998039623 A1 WO 1998039623A1 GB 9800667 W GB9800667 W GB 9800667W WO 9839623 A1 WO9839623 A1 WO 9839623A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid
sensor
probe
elongate member
level sensor
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.)
Ceased
Application number
PCT/GB1998/000667
Other languages
English (en)
Inventor
Steven John Daniels
Martin Orrell
Graham Vesey
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.)
NULECTROHMS Ltd
Original Assignee
NULECTROHMS 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 NULECTROHMS Ltd filed Critical NULECTROHMS Ltd
Priority to AU64074/98A priority Critical patent/AU6407498A/en
Publication of WO1998039623A1 publication Critical patent/WO1998039623A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • G01F23/26—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/268—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 capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors mounting arrangements of probes

Definitions

  • the invention relates to a device comprising a sensor for determining the temperature
  • the explosive liquid and water are the explosive liquid and water. Additionally, it is preferable to know the temperature
  • explosive liquid is the intrinsic safety which must be provided for all internal electrical
  • Objects of the invention include providing a device for determining physical
  • the ingress preventing means comprising a
  • Another aspect of the invention provides a device for determining physical
  • the temperature sensor is located proximal to the level sensor thereby enabling determination of the
  • the level sensor is a capacitance
  • a device for example comprising an elongate conductive member and outer plate or tube.
  • a further aspect of the invention provides a level sensor for determining the position
  • electrically conductive member preferably having a dielectric sheath sealed at one end.
  • the senor can be made by heat- shrinking a sheath of plastics material
  • a temperature sensor for determining the temperature of the
  • Figure 1 is a schematic side elevation view of a storage tank having a device
  • Figure 2 is a schematic sectional side elevation view of a level sensor
  • Figure 3 is a schematic view of another embodiment of a level sensor
  • Figure 4 is a schematic sectional side elevation view of a temperature sensor for
  • Figure 5 is schematic block diagram of a control system for a level sensor
  • Figure 6 is a schematic sectional side elevation view of part of a probe
  • Figure 7 is a sectional side elevation view of another probe according to another
  • Figure 8 is a sectional side elevation view of the upper end of a probe according
  • Figure 9 is a sectional front elevation view of the upper end of a probe according to another aspect of the invention.
  • FIG. 1 there is shown a storage tank 10 for an explosive liquid 12 such
  • Liquid 12 sits above a lower layer of water 14. Liquid is passed
  • the tank 10 comprises a sensor 20
  • Sensor 20 can for
  • example be an ultrasonic or radar device for detecting the position of the upper level
  • Tank 10 further comprises a probe 24 according to the invention which
  • the level sensor 30a comprises a cable exit and entry port 36, a locking nut 38 and a
  • tubular casing 40 for housing a printed circuit board and electrical components 42.
  • the circuitry 42 is rigidly held within casing 40 using a potting compound or cement
  • the potting compound preferably and beneficially provides a complete seal across
  • the mass of the compound 44 beneficially provides a heat sink for the circuit 42.
  • a first electrical connection 46 is made between the level sensor circuitry 42 and end
  • Tube 52 is preferably tubular. Tube 52 is held in position using a retaining nut 54 for example
  • sealing cap 60 threadingly engages
  • end cap 48 an outer threading on end cap 48 and cooperates therewith through pressing sealing
  • sensor 38 comprises a protective tube 64 having a series of apertures 66
  • an optional temperature sensor 70 is
  • tube 52 which has electrical connectors such as wires 68 which pass
  • a screened multi-core cable can be provided for a
  • the screening is preferably terminated at connection 74
  • Sensor 30a further comprises an end cap 76 to help retain tube 52 in a known position
  • an eyebolt can be provided at the lowermost end of
  • probe 24 for example, to allow attachment or a weight or a guide means to position
  • sealing bush 58 comprises a tapered surface 59
  • sealing cap 60 for cooperating with a tapered surface 61 on the inside of sealing cap 60. Accordingly,
  • temperature sensor 70 Referring to Figure 4, there is shown greater detail of temperature sensor 70. A
  • temperature sensor element 80 such as a resistance thermometer such as PtlOO or
  • thermo-couple sensors such as a type K (NCNA) device is provided. It is connected
  • joints 82 and 84 to one or more cores from a multi-core cable 68.
  • Each joint 82 and 84 to one or more cores from a multi-core cable 68.
  • a casing 88 for example of stainless steel and rigidly held in place by a body of
  • potting compound or cement 90 Preferably the screening from cable 68 is connected
  • sensor 70 comprises an outer protective layer 94 for example
  • the sensor 70 can be positioned anywhere along
  • tubular elongate member 52 the length of tubular elongate member 52 and held in position using a cement or other
  • a capacitance rod sensor 96 which operably communicates with a frequency generation
  • circuit 98 positioned within circuitry 42 shown in Figures 2 and 3 for example.
  • plate or tube 64 is preferably achieved by making both components of a good electrical
  • elongate member 52 is coated with a dielectric
  • the dielectric material such a plastic sheath of PTFE or FEP.
  • the dielectric material can be
  • the thickness of the sheath is relatively thin and for example less than or
  • the sheath thickness is about 0.25 mm thick.
  • the relatively thin sheath thickness enables the probe to be media
  • the frequency generation circuit 98 operably communicates with a microprocessor
  • circuit 100 which is programmed to enable calibration of sensor 96 and thereafter,
  • circuit and current converter 106 Communication, including power input and
  • measurement output is via wires 108 such as through a two-core screened cable or two
  • the output can be linear or stepped
  • Temperature sensor 32a is a spot sensor comprising an element substantially similar
  • wires 68 or a screened multi-core cable In this example, element 80 is connected in
  • the wiring 68 is retained in a protective sleeve 114 which is
  • an outer casing 120 is provided which can for example be made
  • Temperature sensor 32b is an averaging temperature sensor which comprises an
  • elongate temperature sensor element 110 of say between 10 and 20 cm long, again
  • thermometer such as a resistance thermometer, which is housed in an insulation protective sleeve
  • termination connection 124 is provided within protective sleeve 114 and again
  • termination 116 and end cap 118 are provided within a protective outer casing 120.
  • a further spacer 126 such as a rigid cylindrical member, is also present.
  • Any number of averaging or spot (local) sensors can be provided along the length of
  • the temperature sensors can be wired independently or have a common
  • probe 24 exits the top of probe 24 as
  • the potting compound 134 surrounds a
  • substrate 130 having tracks 132 thereon.
  • substrate 130 can be a printed
  • circuit board having electrically conductive tracks 132 positioned thereon in a suitable manner to meet requisite safety standards. Accordingly, individual wires can be bared
  • these wires 108 are sheathed in a heat-shrink sheath 138 between seal 136
  • a heat-shrink 140 is
  • the probes and sensors described are applicable to a variety of liquids such as
  • non-explosive organic liquids like benzene and non-explosive inorganic liquids
  • anchor point for example when locating a level sensor in a cavern.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

La présente invention concerne un dispositif destiné à déterminer les caractéristiques physiques d'un liquide contenu dans un récipient de stockage. Ce dispositif comprend une sonde fonctionnellement reliée à l'intérieur du liquide, et une jauge (30) permettant de déterminer la position de l'interface entre le liquide et un autre fluide. Ce dispositif comprend de préférence également une sonde thermique (70) placée à côté de la jauge. L'invention concerne également un dispositif destiné à déterminer les caractéristiques physiques d'un liquide, et particulièrement d'un liquide explosif contenu dans un récipient de stockage. Ce dispositif comprend une sonde (24) fonctionnellement reliée à l'intérieur du liquide, ainsi qu'un organe empêchant le liquide de pénétrer dans la sonde tout en permettant la connexion électrique (28) d'un capteur (30, 32) à l'intérieur de la sonde. Cet organe (134), qui comprend un substrat (130) pourvu de tracés (132) électroconducteurs encapsule le substrat à l'intérieur de la sonde.
PCT/GB1998/000667 1997-03-06 1998-03-06 Sonde et capteur pour liquides Ceased WO1998039623A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU64074/98A AU6407498A (en) 1997-03-06 1998-03-06 Probe and sensor for liquids

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9704681.7 1997-03-06
GBGB9704681.7A GB9704681D0 (en) 1997-03-06 1997-03-06 Probe and sensor for liquids

Publications (1)

Publication Number Publication Date
WO1998039623A1 true WO1998039623A1 (fr) 1998-09-11

Family

ID=10808823

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/000667 Ceased WO1998039623A1 (fr) 1997-03-06 1998-03-06 Sonde et capteur pour liquides

Country Status (3)

Country Link
AU (1) AU6407498A (fr)
GB (1) GB9704681D0 (fr)
WO (1) WO1998039623A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7735354B2 (en) 2006-01-25 2010-06-15 Ngk Spark Plug Co., Ltd. Liquid-condition detection sensor
WO2018081849A1 (fr) * 2016-11-07 2018-05-11 Smarta Industrial Pty Ltd Système et dispositif de surveillance et de commande de produits agricoles
CN110567647A (zh) * 2019-10-21 2019-12-13 张树华 一种钢管质量检测装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0079086A1 (fr) * 1981-11-10 1983-05-18 Sentron v.o.f. Capteur à cathéter avec une unité de mémoire
US5187979A (en) * 1991-04-26 1993-02-23 Edmark Iii Karl W Multi-sensor probe assembly and method for fuel storage system including overflow protection means
DE4228591A1 (de) * 1992-08-27 1994-03-03 Gestra Ag Sonde zur Überwachung von Medium
DE4334663A1 (de) * 1993-10-12 1995-04-13 Rolf Windhorst Verfahren zur kontinuierlichen Messung des Füllstandes eines Flüssigkeitsbehälters und deren Temperatur unter Verwendung einer kapazitiven Meßsonde mit mengengenauer Anzeige auch bei unterschiedlichen Behälterformen
DE19504608A1 (de) * 1995-02-11 1996-08-14 Balluff Gebhard Feinmech Positionssensor und Verfahren zur Herstellung desselben

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0079086A1 (fr) * 1981-11-10 1983-05-18 Sentron v.o.f. Capteur à cathéter avec une unité de mémoire
US5187979A (en) * 1991-04-26 1993-02-23 Edmark Iii Karl W Multi-sensor probe assembly and method for fuel storage system including overflow protection means
DE4228591A1 (de) * 1992-08-27 1994-03-03 Gestra Ag Sonde zur Überwachung von Medium
DE4334663A1 (de) * 1993-10-12 1995-04-13 Rolf Windhorst Verfahren zur kontinuierlichen Messung des Füllstandes eines Flüssigkeitsbehälters und deren Temperatur unter Verwendung einer kapazitiven Meßsonde mit mengengenauer Anzeige auch bei unterschiedlichen Behälterformen
DE19504608A1 (de) * 1995-02-11 1996-08-14 Balluff Gebhard Feinmech Positionssensor und Verfahren zur Herstellung desselben

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7735354B2 (en) 2006-01-25 2010-06-15 Ngk Spark Plug Co., Ltd. Liquid-condition detection sensor
WO2018081849A1 (fr) * 2016-11-07 2018-05-11 Smarta Industrial Pty Ltd Système et dispositif de surveillance et de commande de produits agricoles
CN110567647A (zh) * 2019-10-21 2019-12-13 张树华 一种钢管质量检测装置

Also Published As

Publication number Publication date
GB9704681D0 (en) 1997-04-23
AU6407498A (en) 1998-09-22

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