IMPACTION: Particles larger than 1 µm collide with and adhere to the ﬁbers of the element.
INTERCEPTION: Particles 0.3 µm to 2 µm in size are molecularly attracted to the ﬁbers of the element, and this causes them to adhere.
DIFFUSION: Particles 0.001 µm to 0.3 µm in size move by random Brownian motion, thereby contacting and adhering to the ﬁbers of the element.
DRAINING: Tiny droplets of oil coalesce (merge) until they form drops large enough to fall off the ﬁlter element and into the bowl sump. The automatic drain then expels them.
The ﬁlter element will continue to coalesce liquids until solid contaminants accumulated in the ﬁlter element cause the pressure drop across the element to become excessive. At this point the ﬁlter element must be changed. A built-in differential pressure gauge will indicate when the point is reached that requires the element to be changed.
A general purpose filter must be installed ahead of a coalescing filter to ensure good performance and to extend the life of the coalescing element.