Oil condition sensor

Details Oil condition sensor Oil condition sensor

2006-09-26

2006-09-26

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S724000, C073S061420

Reexamination Certificate

active

07112973

ABSTRACT:
An oil condition sensor includes rod-shaped electrodes and an opposed cup-shaped electrode. The rod-shaped electrodes are connected to a first power supply through first fixed resistors having a predetermined threshold. The voltage from the first power supply is applied through the respective rod-shaped electrodes to first inputs of respective operational amplifiers. The sensor further includes a second power supply which produces a voltage applied to second inputs of the respective operational amplifiers. Each operational amplifier produces a predetermined voltage if the voltage applied to the first input falls below the voltage applied to the second input. The output of each operational amplifier is connected to the second input through a second fixed resistor. There is a hysteresis relation between the input and output of the amplifiers, so that once an operational amplifier produces voltage, even if voltage from the corresponding conductor falls thereafter, the operational amplifier continuously produces voltage.

REFERENCES:
patent: 4323843 (1982-04-01), Batham
patent: 5457396 (1995-10-01), Mori et al.
patent: 5614830 (1997-03-01), Dickert et al.
patent: 6377052 (2002-04-01), McGinnis et al.
patent: 6556026 (2003-04-01), Ogimoto et al.
patent: 6803775 (2004-10-01), Sanchez et al.
patent: 2002-286697 (2002-10-01), None

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