Machine oil deterioration detection
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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Abstract
A machine oil deterioration detection apparatus having a copper thin film resistor formed on an electrically insulating holding member and immersed in a machine oil. The copper thin film resistor is corroded by acid produced in accordance with deterioration of the machine oil, thus changing the resistance of the resistor. The change in resistance is detected by a detection circuit, connected to the thin film resistor, for detecting the resistance of the thin film resistor.
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Citations
5 Claims
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1. An apparatus for detecting the degree of deterioration of machine oil, comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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Specification