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Portable oil change analyzer

  • US 5,377,531 A
  • Filed: 09/30/1993
  • Issued: 01/03/1995
  • Est. Priority Date: 09/30/1993
  • Status: Expired due to Fees
First Claim
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1. An apparatus for determining the lubricating characteristics of combustion engine lubrication oil, said apparatus comprising a viscosity measuring element and a contamination measuring element, said viscosity measuring element comprising a plunger assembly and an oil sample receptacle, said plunger assembly comprising a plunger means, a solenoid means and a switch means for measuring a displacement time of said plunger through oil in said oil sample receptacle, said contamination measuring element comprising a light source and a light sensor operable to optically measure the variance in transmittance of light through an oil sample dish between said light source and said light sensor;

  • a calculating element, electronically connected to said viscosity measuring element and said contamination measuring element, comprising a processor means, a memory storage means, and a program means for conversion of said displacement time to a viscosity and the output from said light sensor to a normalized contamination level, and for correlating said viscosity and said contamination level to a state of oil degradation.

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