Methods Of Analysis - PerkinElmer OilExpress System User Manual

Methods of Analysis

The OilExpress System is an automated system that uses infrared (IR) analysis to monitor oil
quality parameters: chemical degradation products and common contaminants of lubricating
oils. The OilExpress System provides a range of Analysis Methods for measuring these
parameters, including standard methods for Mineral Oils, Synthetic Oils, and the Joint Oil
Analysis Program (JOAP). Within OilExpress, methods can be added or deleted, and the
properties of existing methods customized.
Used oil samples are complex mixtures of a large number of different chemicals and include
compounds derived from the original formulation of base oil and its additives, oil degradation
products and oil contaminants. As a result of this a used oil spectrum is complex; because of
this complexity, the spectrum of a used oil alone is of limited value and must be compared
against a spectrum of the unused oil to be of any significant analytical value.
61.2
50
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%T
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0.0
4000.0 3600
Figure 27 Spectrum of a used oil sample
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%T
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Figure 28 Spectrum of an unused oil sample
3200 2800 2400 2000 1800
cm-1
3200 2800 2400 2000 1800
cm-1
Background to Used Oil Analysis . 71
1600 1400 1200 1000 800
1600 1400 1200 1000 800
500.0
500.0