Why do the PCB's need to be exposed to the high humidity?

On 7/24/2010 8:14 AM, V G wrote:
> Hi all,
>
> As I have mentioned previously, I am designing a temperature and
> humidity control system for my university lab that I am working in.
> Several dsPIC controlled remote terminal units (RTUs) will be placed
> in self contained chambers. These RTUs will provide a means to log and
> control temperature and humidity. Within the chambers are special
> fungi that require a high relative humidity (RH) level to grow
> effectively - sometimes even close to 100% RH.
>
> I am concerned that water from the air may condense on the PCBs and
> cause problems (such as undesirably conducting electricity, and so
> on). Should I be worried about this? If so, what can I do about it?
>
> Also, are there any other potential problems that I should be aware of
> for running home-made electronic equipment in a high humidity
> environment?
>
> Will a crystal/crystal oscillator deviate enough from it's desirable
> frequency in a high humidity environment to cause serial communication
> issues?
>   =20
--=20
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