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Varnish

The Varnish Potential Rating (QSA^SM) - A sample of oil is mixed with solvent and pulled through a filter-membrane. The color spectra of the insolubles collected can be correlated to the amount of insolubles in the oil and the "soft contaminants" present. The high level of soft contaminants in the sample indicates that the oil has a high propensity to produce varnish. It has also been observed that a process of Auto-Degradation can be occurring in the oil. This Auto-Degradation process can be observed and quantified by determining a second QSA^SM 72-hours after the sample has been pulled - commonly called a Delta QSA^SM. Large Delta QSA^SM values indicate extensive Auto-Degradation. The on-site QSA^SM indicates the system is clean, or being cleaned by the company's units. However, the Delta QSA^SM running at 50-71 indicates an abnormal level and Auto-Degradation occurring.

In systems with varnish problems, you may also come across instances of Electrostatic Spark Discharge, or Flow Electrification.