Water-soluble oil property detection device
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United States of America Patent
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Aug 15, 1989
Grant Date -
N/A
app pub date -
Apr 4, 1988
filing date -
Apr 4, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device for detecting properties of electrically conductive water-soluble oil used in hydraulic pressure-operated devices. The water-soluble oil property detection device is characterized in that it comprises a pair of electrodes placed in a water-soluble oil, a capacitor which is connected in series with the electrodes and which forms a filter circuit with the resistance of the water-soluble oil between the electrodes, a high-frequency power source which has a high-frequency oscillator circuit and a power amplifier and which is connected to both ends of the capacitor and electrodes, and AC-DC converter circuit which detects a high-frequency voltage value occurring at both ends of said capacitor or the resistance between the electrodes and converts the value to a direct current voltage signal, and an indicator part which indicates the output of the converter circuit in correspondence to water-soluble oil property changes.
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