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The example graph provided shows how the oil is degrading faster than expected (the blue line
representing the normal expected behaviour) and a point where this contamination becomes
evident as the oil condition deteriorated further.
12.3.6 TBN Decrease
A decrease in Total Base Number (TBN) is indicated by the exponential decrease in TDN value
with time, also described by the downward curve of the plot.
Figure 81 - TBN Decrease
In the example graph provided, you can see the downward curve in the data clearly emerging
indicating an issue.
12.4 Event Identification & Validation (EIV)
Data returned from the Oil Quality Sensor can be used to identify and validate key events such
as oil changes and oil top-ups. As the Oil Quality Sensor sends back a holistic full spectrum
analysis of the oil condition in the form of a condition number (TDN), the trend of these
returned numbers can be analysed to identify an event such as a maintenance interval or
intervention.
Complete oil changes will show as a direct linear change in the reported oil condition, if the
TDN value returns to the point expected of a new clean oil (1), then the oil change can be
validated as being carried out correctly.