Hi Carl
Do you clean your end product?
If the answer to that question is no, then has a problem appeared that is considered fixable by using a conformal coating?
If the answer to that question is yes, then don't coat. You will, very probably, be sealing in a problem. Keep in mind that all coatings breathe.
Applying a coating to further protect the connectors might not be necessary.
I hope this helps
Regards
Graham Naisbitt
Email: [log in to unmask]
Phone: +44 (0)12 5252 1500
Web: www.gen3systems.com
On 23 Aug 2010, at 18:52, Carl VanWormer wrote:
> 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
>
> [log in to unmask]
>
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