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Machine oil deterioration detection

  • US 4,675,662 A
  • Filed: 08/01/1985
  • Issued: 06/23/1987
  • Est. Priority Date: 08/06/1984
  • Status: Expired due to Term
First Claim
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1. An apparatus for detecting the degree of deterioration of machine oil, comprising:

  • a thin film resistor member made of copper and formed on an electrically insulating holding member and adapted to be immersed in the machine oil, said film resistor member subject to being corroded and the electrical resistance thereof between two ends thereof thereby changed upon exposure to an acid which accumulates in the machine oil, in use, due to deterioration of the machine oil;

    respective electrode members conductively joined at respective junctions to said thin film resistor member said two ends of said thin film resistor member; and

    a resistance variation detection circuit operatively connected to said electrode members for detecting a variation in the magnitude of the electrical resistance of said thin film resistor member as a voltage drop between said two ends upon causing an electrical current to flow along said thin film resistor member.

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