Re: Good coating for condensation protection?

From: D Akers (digikey_at_webtv.net)
Date: 12/30/04 

Date: Wed, 29 Dec 2004 20:52:08 -0500

B. Stock wrote:
"I've got a temperature sensor circuit which is subject to severe
condensation. What's a good protective coating? I was thinking of
filling the enclosure with silicone caulk, but I imagine some spray
coating might be better?"
____________________________________
Re;
I've used a product called "Plasticoat" which is sold in many hardware
stores. I've dipped whole circuit boards in it. It's non-conductive,
water proof, acid proof, and tough, albeit probably not flame-proof.
It, and any other coating, will affect the response time constant of any
temperature sensor and increase any self-heating effect/error.
Additionally, you'll need to derate the power dissipation of any coated,
heat dissipating components. Repairs are made difficult, if not
impossible.

-Dan Akers