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GB2247529A - Coating-responsive material condition monitoring system - Google Patents

Coating-responsive material condition monitoring system

Info

Publication number
GB2247529A
GB2247529A GB9103868A GB9103868A GB2247529A GB 2247529 A GB2247529 A GB 2247529A GB 9103868 A GB9103868 A GB 9103868A GB 9103868 A GB9103868 A GB 9103868A GB 2247529 A GB2247529 A GB 2247529A
Authority
GB
United Kingdom
Prior art keywords
output
sensor
coating
material condition
monitoring system
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
GB9103868A
Other versions
GB9103868D0 (en
GB2247529B (en
Inventor
Frederick L Maltby
L Jonathan Kramer
Steven R Petersen
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.)
Drexelbrook Controls Inc
Original Assignee
Drexelbrook Controls Inc
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 Drexelbrook Controls Inc filed Critical Drexelbrook Controls Inc
Publication of GB9103868D0 publication Critical patent/GB9103868D0/en
Publication of GB2247529A publication Critical patent/GB2247529A/en
Application granted granted Critical
Publication of GB2247529B publication Critical patent/GB2247529B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G01F23/266—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 measuring circuits therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

A multiple set point material condition monitoring system (10) responds both to the level of material with respect to a sensor and the extent of material coating which has accumulated on the sensor. The system (10) provides an output when a predetermined coating thickness has been exceeded, so that the sensor may be cleaned before the coating can accumulate to the extent where a false level output is generated. The system (10) includes three electrode guarded sensors (32, 36, 40), a bridge (72) comparing the sensor output with a reference, and a bridge reference (78) which is automatically and repeatedly caused to assume a sequence of values corresponding to material condition set points, one of which causes an output when a predetermined coating thickness has occurred and another of which generates a level output. In one enbodiment, separate outputs are provided corresponding to each set point. In another embodiment, a single tri-state output is responsive to both set points.
GB9103868A 1988-08-25 1991-02-25 Coating-responsive material condition monitoring system Expired - Fee Related GB2247529B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US23690488A 1988-08-25 1988-08-25
PCT/US1989/003694 WO1990002319A1 (en) 1988-08-25 1989-08-25 Coating-responsive material condition monitoring system

Publications (3)

Publication Number Publication Date
GB9103868D0 GB9103868D0 (en) 1991-05-15
GB2247529A true GB2247529A (en) 1992-03-04
GB2247529B GB2247529B (en) 1993-04-14

Family

ID=22891481

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9103868A Expired - Fee Related GB2247529B (en) 1988-08-25 1991-02-25 Coating-responsive material condition monitoring system

Country Status (5)

Country Link
JP (1) JP2930340B2 (en)
CA (1) CA1338881C (en)
DE (1) DE3990989T (en)
GB (1) GB2247529B (en)
WO (1) WO1990002319A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2351902A (en) * 1999-07-14 2001-01-17 Earth Anchors Ltd A folding bench having folding roof

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100434930B1 (en) * 2001-03-07 2004-06-14 박경래 A reinforcing device for stabilizer of western-style bow
DE102007049526A1 (en) * 2007-10-15 2009-04-16 Endress + Hauser Gmbh + Co. Kg Medium's i.e. dielectric fluid, process factor determining and/or monitoring device, has probe electrode arranged in such manner that electrode opens out on end surface of sensor unit, where end surface is provided in split-free manner
SE541463C2 (en) * 2017-10-06 2019-10-08 Sealwacs Ab Plastic welding sensor

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4638305A (en) * 1985-03-22 1987-01-20 General Motors Corporation Apparatus for detecting water in fuel
US4676101A (en) * 1986-09-03 1987-06-30 Walbro Corporation Capacitance-type material level indicator
US4676100A (en) * 1984-10-31 1987-06-30 Berwind Corporation Capacitance-type material level indicator
US4686857A (en) * 1983-03-04 1987-08-18 Kabushiki Kaisha Toyota Chuo Kenkyusho Method and apparatus for evaluating the performance of dielectric substances
US4749988A (en) * 1986-11-20 1988-06-07 Imtec Products, Inc. Non-invasive liquid level sensor
US4757252A (en) * 1985-10-25 1988-07-12 Drexelbrook Controls, Inc. Probe system for measuring the condition of materials
US4800755A (en) * 1982-08-25 1989-01-31 Berwind Corporation Capacitance-type material level indicator
US4803428A (en) * 1985-10-18 1989-02-07 Crostack Horst Artur Method and apparatus for non-destructive material testing, particularly for determination of thickness of coating layers on a base material by measuring electrical conductivity or magnetic permeability at the finished specimen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4624139A (en) * 1984-09-21 1986-11-25 Berwind Corporation Capacitance-type material level indicator
US4723122A (en) * 1985-10-25 1988-02-02 Drexelbrook Controls, Inc. Remotely calibratable instrument system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4800755A (en) * 1982-08-25 1989-01-31 Berwind Corporation Capacitance-type material level indicator
US4686857A (en) * 1983-03-04 1987-08-18 Kabushiki Kaisha Toyota Chuo Kenkyusho Method and apparatus for evaluating the performance of dielectric substances
US4676100A (en) * 1984-10-31 1987-06-30 Berwind Corporation Capacitance-type material level indicator
US4638305A (en) * 1985-03-22 1987-01-20 General Motors Corporation Apparatus for detecting water in fuel
US4803428A (en) * 1985-10-18 1989-02-07 Crostack Horst Artur Method and apparatus for non-destructive material testing, particularly for determination of thickness of coating layers on a base material by measuring electrical conductivity or magnetic permeability at the finished specimen
US4757252A (en) * 1985-10-25 1988-07-12 Drexelbrook Controls, Inc. Probe system for measuring the condition of materials
US4676101A (en) * 1986-09-03 1987-06-30 Walbro Corporation Capacitance-type material level indicator
US4749988A (en) * 1986-11-20 1988-06-07 Imtec Products, Inc. Non-invasive liquid level sensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2351902A (en) * 1999-07-14 2001-01-17 Earth Anchors Ltd A folding bench having folding roof
GB2351902B (en) * 1999-07-14 2001-06-27 Earth Anchors Ltd A bench

Also Published As

Publication number Publication date
JPH04501770A (en) 1992-03-26
GB9103868D0 (en) 1991-05-15
DE3990989T (en) 1992-01-30
JP2930340B2 (en) 1999-08-03
CA1338881C (en) 1997-01-28
WO1990002319A1 (en) 1990-03-08
GB2247529B (en) 1993-04-14

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Legal Events

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

Effective date: 19950825

728V Application for restoration filed (sect. 28/1977)
728Y Application for restoration allowed (sect. 28/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20020825