Filtergram Analysis
29/01/2009
Filtergram AnalysisFiltergram analysis is the microscopic examination
of wear particles taken from an oil sample or filter medium. A Filtergram
can identify particles from 3 microns to over 1,000 microns. Particle size,
wear factor and identification are reported in graphs and include
two scaled photographs highlighting critical points in a sample. Positive
confirmation is assured to differentiate between chemical leaching and
mechanical wear.
A filtergram analysis of an oil sample can
be a very useful addition to the more traditional methods of condition
monitoring. The sample to be examined is dissolved in a solvent and filtered
through a very fine membrane filter. The wear debris and other contaminants
in the oil are captured on the membrane for examination under a high power
microscope. The filtergram report gives an analysis of the size and composition
of all the particles found as well as the wear mechanism which generated
the metallic particles. Photographs of selected particles are presented
on the report. Debris recovered from filter media can also be analysed
by these techniques.
Filtergram ReportPreparing samples for Filtergram Analysis
-Place oil sample into SOS4 bottle (yellow
lid) as per recommended sampling procedure.
-Ensure work bench is free from contamination.
-Cut filter open using 4C5084 Filter Cutter.
Inspect filter for abnormal debris.
-Place approximately 10 cm2 of filter pleat
into supplied plastic re-sealable bag.
-Post engine filter medium and oil sample
together in prepaid mailing satchel.