FR2243624A5 - Detection of pollution in a fluid - partic an oil used in a machine tool, by measuring dielectric constant - Google Patents

Detection of pollution in a fluid - partic an oil used in a machine tool, by measuring dielectric constant

Info

Publication number
FR2243624A5
FR2243624A5 FR7332733A FR7332733A FR2243624A5 FR 2243624 A5 FR2243624 A5 FR 2243624A5 FR 7332733 A FR7332733 A FR 7332733A FR 7332733 A FR7332733 A FR 7332733A FR 2243624 A5 FR2243624 A5 FR 2243624A5
Authority
FR
France
Prior art keywords
fluid
dielectric constant
pollution
machine tool
oil used
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
FR7332733A
Other languages
French (fr)
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.)
Safran Filtration Systems SAS
Original Assignee
Sofrance SAS
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 Sofrance SAS filed Critical Sofrance SAS
Priority to FR7332733A priority Critical patent/FR2243624A5/en
Application granted granted Critical
Publication of FR2243624A5 publication Critical patent/FR2243624A5/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2617—Measuring dielectric properties, e.g. constants
    • G01R27/2623—Measuring-systems or electronic circuits
    • G01R27/2629—Bridge circuits

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

In an appts. for determining the degree of pollution of a fluid by an impurity modifying its dielectric constant e.g. oil used in a machine tool, of the known type consisting of a measuring condenser and a reference condenser to be mounted in two arms of a measuring bridge, the structures of the two condensers are geometrically identical and both are immersed simultaneously in the fluid in such a way as to be subjected to the same temp. variations, the reference condenser uses the same but unpolluted fluid. Appts. prevents erroneous results being obtained due to e.g. expansion, specific changes in the characteristics of the oil due to temp. etc. which alter the dielectric constant.
FR7332733A 1973-09-12 1973-09-12 Detection of pollution in a fluid - partic an oil used in a machine tool, by measuring dielectric constant Expired FR2243624A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7332733A FR2243624A5 (en) 1973-09-12 1973-09-12 Detection of pollution in a fluid - partic an oil used in a machine tool, by measuring dielectric constant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7332733A FR2243624A5 (en) 1973-09-12 1973-09-12 Detection of pollution in a fluid - partic an oil used in a machine tool, by measuring dielectric constant

Publications (1)

Publication Number Publication Date
FR2243624A5 true FR2243624A5 (en) 1975-04-04

Family

ID=9124911

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7332733A Expired FR2243624A5 (en) 1973-09-12 1973-09-12 Detection of pollution in a fluid - partic an oil used in a machine tool, by measuring dielectric constant

Country Status (1)

Country Link
FR (1) FR2243624A5 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2500169A1 (en) * 1981-02-18 1982-08-20 Lucas Industries Ltd APPARATUS FOR PROVIDING INDICATION OF A VARIATION OF THE DIELECTRIC CONSTANT OF A FLUID

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2500169A1 (en) * 1981-02-18 1982-08-20 Lucas Industries Ltd APPARATUS FOR PROVIDING INDICATION OF A VARIATION OF THE DIELECTRIC CONSTANT OF A FLUID

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Legal Events

Date Code Title Description
ST Notification of lapse