Abstract
Real time oil quality monitoring techniques help to protect important industry assets, minimize downtime and reduce maintenance costs. The measurement of a lubricant’s complex permittivity is an effective indicator of the oil degradation process and it can be useful in condition based maintenance (CBM) to select the most adequate oil replacement maintenance schedules. A discussion of the working principles of an oil quality sensor based on a marginal oscillator to monitor the losses of the dielectric at high frequencies (>1 MHz) is presented. An electronic design procedure is covered which results in a low cost, effective and ruggedized sensor implementation suitable for use in harsh environments.
Highlights
Oil quality sensors provide an indication of the condition of oils by measuring different fluid characteristics such as viscosity, density, optical and electrical properties
The PSPICE amplifier model used by the simulator is more realistic than the simplified one used to obtain the frequency of oscillation, obtained results are closer to real circuit operation
A low cost oil quality sensor based on a marginal oscillator is presented which monitors changes on the impedance of the sensing electrodes at high frequencies
Summary
Oil quality sensors provide an indication of the condition of oils by measuring different fluid characteristics such as viscosity, density, optical (light scattering) and electrical properties (permittivity and conductance). It is concluded from the electrochemical studies and patents of impedance measurements of lubrication oils [29,30,31,32,33,34] and the Nyquist plots that low frequencies are the most sensitive to variations in impedance due to changes of the dielectric constant of the fluid. This paper discusses the design of a low cost and effective oil quality circuit capable to monitor changes in the real part of the impedance of the sensing electrodes at high frequencies
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