Humidity Box for Benching?

[JacobHansen]

Have anyone ever done a succesfully Humidity box for benching purposes only?

I've been drawing a bit in paint - And i belive that if i can create a kind of "underpressure".. Then the condensation should only appear on the outside of the box..

http://frip.dk/jacobhansen/drawing%20humidity.JPG

[Russell_hq]

You would be better creating a positive pressure, or over pressure as you may call it. The problem with creating a vacuum (underpressure) is any gaps in your seals you have will draw moist air back into the box.

If you get a cylinder of dry nitrogen or any other cheap dry inert gas then just build your box and add a fill port. fill the box with the dry nitrogen and you should have no moisture inside the box. You may want to purge the box a couple times with the nitrogen to displace the moist air. Also adding some silica gel may help.

Aslong as you can keep a positive pressure then no moist air can seep in as nitrogen will be constantly blowing out all the small gaps you have. If you seal it up good then you should only loose a small amount of nitrogen over time.