ISO 4548-12:2017
[Current]
Methods of test for full-flow lubricating oil filters for internal combustion engines — Part 12: Filtration efficiency using particle counting and contaminant retention capacity
...The contamination level should be checked with the online particle counting system which will, at the
same time, clean the sampling lines...
...online count (Co) using Formula (8):
C
ND
V
o
c
=
(8)
where
N
c
is the cumulative count for the sample interval, in number of particles;
D is the dilution factor;
V is the volume of fluid passed through the particle counter sensor during the sampl...
...3;
Final differential pressure = Initial differential pressure +100 kPa;
Online particle counting and online dilution calibrated as per ISO 11171 and ISO 11943 [particle size
expressed in m (c)];
Base upstream gravimetric level (bugl) = 10 mg/l...
