METHOD AND APPARATUS FOR ON-LINE MONITORING OF QUALITY AND/OR CONDITION OF HIGHLY RESISTIVE FLUIDS

摘要

A method of monitoring a highly electrically-resistive fluid such as a motor oil or lubricant, applying an AC electrical potential across the fluid at a first frequency and a first DC offset such that a first electrical response results; measuring the resulting first electrical response; applying the AC electrical potential across the fluid at a second frequency for a non-zero first DC offset voltage, a second DC offset or combinations thereof resulting in a second electrical response; wherein the second frequency and the second DC offset being different from the first frequency and the first DC offset respectively; measuring the resulting second electrical response; and analyzing the fluid's quality and/or condition from the measured first and second electrical responses to the respective first and second applied electrical potentials.