Counting contaminant particles
The measuring principle of the light blockade procedure is shown in
simplified form in the following sketch.
The light source transmits monochromatic light through the flow of oil to a
photo detector, which produces a particular electrical signal. If a particle gets
between the light source and the photo detector, then a shadow will be cast
on the photo detector.
This shadow causes a change in the electrical signal generated by the photo
detector. This change makes it possible to determine the size of the shadow
cast by the particle and thus to gauge the size of the particle itself.
This procedure makes it possible to determine the cleanliness class
according to ISO 4406:1987, ISO 4406:1999, NAS 1638 and SAE AS 4059.
The disruption factors of this measurement principle are foreign fluids and
small gas bubbles that lead to refractions, thus causing them to be counted
as particles as well.
FCU1310
en(us)
Page 25 / 124
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