US Patent No: 5,656,767

Number of patents in Portfolio can not be more than 2000

Automatic determination of moisture content and lubricant type

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Abstract

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A method and apparatus for automatically detecting a lubricant type and the relative quantity of water present in a test sample of lubricating oil includes the use of an open grid capacitive sensor element that incorporates the lubricating oil as a dielectric medium. The sensor element grid is energized by a frequency variable oscillator that automatically responds to changes in the oil dielectric constant with corresponding frequency changes. As a reference, a sample of new or uncontaminated test oil is confined in wet surface contact with the energized, open grid sensor element. Oscillator frequency changes are measured and recorded, either continuously or at frequent intervals, over a standardized elapsed time interval to generate a reference characterization of the frequency-time relationship distinctive of the particular oil. The same is repeated for a sample of contaminated oil and a corresponding frequency-time relationship generated. Water affinity rate correlations between frequency change and respective states of moisture content are determined and data base recorded. The affinity rate correlations are applied to the respective frequency differentials between the contaminated oil and uncontaminated oil at the end of the test period. Data bases are also recorded of correlations between natural frequency and sample temperature changes that distinguish lubricants by type, use classification or quantity of additive content.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
COMPUTATIONAL SYSTEMS, INC.KNOXVILLE, TN74

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Carey, Alexander Andrew Lenoir City, TN 2 41
Garvey, III Raymond E Loudon, TN 6 185

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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Halliburton Logging Services, Inc. (1)
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* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
ROCKWELL AUTOMATION, INC. (1)
6,449,580 Evaluating properties of oil using dielectric spectroscopy 18 1998
 
GENERAL ELECTRIC COMPANY (1)
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ORION TECHNOLOGIES, CORP. (1)
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The Lubrizol Corporation (7)
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PHASE DYNAMICS, INC. (2)
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VAISALA OYJ (1)
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EMERSON CLIMATE TECHNOLOGIES, INC. (12)
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9,046,900 Method and apparatus for monitoring refrigeration-cycle systems 0 2013
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VOLKSWAGEN AG (1)
* 6,223,589 Oil quality sensor 34 1999
 
REID ASSET MANAGEMENT (1)
7,541,004 MEMS-based sensor for lubricant analysis 17 2004
 
COMPUTATIONAL SYSTEMS, INC. (2)
6,839,660 On-line rotating equipment monitoring device 15 2002
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ABB TECHNOLOGY AG (1)
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TRICO CORPORATION (9)
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BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT (2)
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* Cited By Examiner