In our recent dives we’ve discovered an uncomfortable amount of condensation forming in the dome of our electronics enclosure. No leakage, we make sure to always have an approved vacuum-test before every dive, and both leak sensor probes are completely dry. This sounds to me as the condensation is being “created” inside.
Is it possible that the area we close the enclosure in has a high humidity level, and the difference in environment makes the “fog”? Even with a bag of silica gel literally on the spot will not keep the dome clear.
It is not the end of the world as we are mostly using other cameras for flight, but it does not feel right. any tips?
Hi @Erlingns95 -
With that level of condensation, I definitely suspect a leak! A positive pressure test may help find the source, perhaps a cracked dome or dirty o-ring? Sometimes a missing o-ring could also cause?
Generally this could happen if you were closing up the housing in a humid environment, but with fresh desiccant shouldn’t be an issue after about 20 minutes of being sealed. Are you recharging your desiccant in a toaster or microwave to get the color change indicating it is fresh?
Not recharged it, but it is brand new. Got it in the mail this week. Could try recharging. I know for a fact that all O-rings are in place, but could give them a rinse and some fresh molykote.
The dome does have some scratches, maybe we should swap it out with a new one. Unsure about the definition of the word “leak”, but I assure you that no drops of water have made it in. Bottom of the tube is completely dry, even after hours in operation.
Positive pressure test using the PRV and some leak finder?
Hi Erling -
I’d define a leak as any amount of water moving from outside to inside the enclosure!
I’ve seen small cracks on the dome, usually only visible if the part is removed, allow such a small amount of water in at such a low rate, that it immediately evaporates, and will condense on the acrylic immediately around it.
If you put positive pressure on the enclosure and use soapy water or submerge the system, you should see where air is escaping. We made this short illustrating the process!
