We are considering conformal coating our boards that will go into a
chassis that may be an occasional high humidity environment. I have
been told that the humidity (and water) is "slowed down" by the
conformal coating, and that good cleaning before the conformal coating
is essential for reliability. Assuming we have done all we can do for
the PC board assembly, my worry goes to the next level; the cables that
connect between boards and also to the valves, relays, and sensors. Is
it worth considering messing up the system with silicone grease smeared
on all of the 2-pin, 5-pin, and 50 pin (IDC) plugs and sockets? I know
some of the cute little phone-wire crimp-on IDC button connectors are
filled with a dielectric grease, so it must have some value. And what
about the IDC connector, with its pins just piercing the ribbon cable .
. . Is there a long term reliability problem there, too?
I'm looking for "fatherly guidance" on making a system that won't ever
need a field service call.
Thanks for tolerating my paranoia,
Carl
Carl Van Wormer, P.E., AE7GD
Senior Hardware Engineer
Cipher Systems
1800 NW 169th Place, Suite B-100
Beaverton, OR 97006
Cipher Systems (503) 617-7447 x 5163
Direct Line (503) 425-5163
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