COPS — Combined oil quality and particle measurement system

A miniaturized condition monitoring system for technical fluids was realized to determine the oil quality based on an analysis of the infrared spectrum at different spectral wavelength. It has the ability to detect and quantify oxidation, depletion of additives and water contamination that are responsible for reduced lubricating properties or excessive corrosion in lubricating systems. The system is combined with a particle sensor based on forward and backward scattering of a near infrared laser beam. The scattered light provides information about the particle concentration and can discriminate between air bubbles, dust and metallic particles. A combination of both sensor systems can provide partial self-monitoring. The combination of both principles in inline systems can increase the process safety and reduce costs for laboratory analysis and oil changes.