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Unusual Particle Counts Confusing
Wayne Downes, Lubrication Consultant, Total South
Africa
Check where the problematic sample points are located. If the
pre-filter sampling point is badly located i.e. on a 'laminar'
flow part of the line it is possible that you are not getting
a representative sample and the oil can then the pre-filter oil
will appear to be quite clean. The filter and filter housing can
however create a lot of turbulence thus giving an optimum oil
sample after the filter that will be very representative of the
'dirty'oil in your system. It must be kept in mind that one will
still find contaminated oil after a filter, unless you are using
very efficient expensive filters.
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