Water-soluble oil property detection device
First Claim
1. A device for detecting a lubricating and rust preventing property of water-soluble oil used in hydraulic pressure-operated devices, said device comprising:
- a pair of electrodes placed in the water-soluble oil;
a capacitor connected in series between one end of said pair of electrodes and ground and forming a filter circuit with the resistance of said water-soluble oil between said pair of electrodes;
a high-frequency power source including a high-frequency oscillator circuit and a power amplifier and which is connected across the series combination of said capacitor and pair of electrodes;
an AC-DC converter circuit for detecting a high-frequency voltage value occurring across said capacitor and for converting said value to a direct current voltage signal; and
an indicator for indicating the output of said converter circuit in correspondence to changes in said property of said water-soluble oil,said high-frequency power source generating a high-frequency voltage of a frequency at which the voltage occurring across said capacitor is in a range of about one-fifth to four-fifths of the voltage generated by said high-frequency power source.
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Accused Products
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.
26 Citations
6 Claims
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1. A device for detecting a lubricating and rust preventing property of water-soluble oil used in hydraulic pressure-operated devices, said device comprising:
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a pair of electrodes placed in the water-soluble oil; a capacitor connected in series between one end of said pair of electrodes and ground and forming a filter circuit with the resistance of said water-soluble oil between said pair of electrodes; a high-frequency power source including a high-frequency oscillator circuit and a power amplifier and which is connected across the series combination of said capacitor and pair of electrodes; an AC-DC converter circuit for detecting a high-frequency voltage value occurring across said capacitor and for converting said value to a direct current voltage signal; and an indicator for indicating the output of said converter circuit in correspondence to changes in said property of said water-soluble oil, said high-frequency power source generating a high-frequency voltage of a frequency at which the voltage occurring across said capacitor is in a range of about one-fifth to four-fifths of the voltage generated by said high-frequency power source. - View Dependent Claims (2, 3, 4)
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5. A device for detecting a lubricating and rust-preventing property of water-soluble oil used in hydraulic pressure-operated devices, said device comprising:
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a pair of electrodes placed in a water-soluble oil; a capacitor which forms a filter circuit with the resistance of said water-soluble oil between said electrodes, said pair of electrodes being connected in series between one end of said capacitor and ground; a high-frequency power source including a high-frequency oscillator circuit and a power amplifier and which is connected across the series combination of said capacitor and electrodes; an AC-DC converter circuit which detects a high-frequency voltage value occurring across said electrodes and converts said voltage value to a direct current voltage signal; and an indicator part which indicates the output of said converter circuit in correspondence to the water-soluble oil property changes, said high-frequency power source generating a high-frequency voltage of a frequency wherein the voltage occurring across said pair of electrodes is in a range of about one-fifth to about four-fifths of the voltage generated by said high-frequency power source. - View Dependent Claims (6)
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Specification