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August 2010

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Subject:
From:
"Honsowetz, Eric" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Honsowetz, Eric
Date:
Mon, 23 Aug 2010 14:04:16 -0400
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There is a significant difference between humidity exposure and water
exposure.  If high humidity then the issue is corrosion of the connector
materials and you should be concerned with galvanic potential of the
metals in the connector.  If it is water exposure, then the entire
connector should be sealed wherever the water can touch. In vehicles we
see water wicking through the wires from connectors which are not sealed
into connectors which are sealed all too often.

Best Regards,

eric


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Carl VanWormer
Sent: Monday, August 23, 2010 1:53 PM
To: [log in to unmask]
Subject: [TN] humid environments and long term reliability

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]

This message may contain confidential and/or proprietary information,
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addressed. Any use by others is strictly prohibited.  If I sent this to
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so I can send it to the right person.

 


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