[PSUBS-MAILIST] Heating elements

Sun Aug 9 12:14:08 EDT 2015

Thanks Emile,

Good ideas, I´ll check the Dehumidifier you mentioned, and of course the new Raymarine Flux as well.

Cheers, Lasse

Lasse Schmidt Westrén
Upplevelsepresent.se<http://Upplevelsepresent.se>
Skeppsbron 21, Tullhus 1
11130 Stockholm
070-28 32 660

6 aug 2015 kl. 23:51 skrev Emile van Essen via Personal_Submersibles <personal_submersibles at psubs.org<mailto:personal_submersibles at psubs.org>>:

Hi Lasse,

I have good results wit a small electric Peltier dehumidifier. Normally I dry the interior after the dives but the dehumidifier brings it from 95% to 55 % in a day.

During dives you can experiment with a layer of Silica in the scrubber .

I spoke today with a boatshop owner about compasses. He told Raymarine has a new fluxgate sensor with build in gyro’s.  This to compensate magnetic anomalies and heavy sea state.

Best regards, Emile

________________________________
Van: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] Namens Lasse Schmidt via Personal_Submersibles
Verzonden: donderdag 6 augustus 2015 22:02
Aan: Personal Submersibles General Discussion
Onderwerp: Re: [PSUBS-MAILIST] Heating elements

Sean,

I am trying to battle the moist from two fronts. The first is to keep the all the electronics heated pretty much all the time, even when I´m not using the sub and it is docked. The other is to install some kind of dehumidifier into the cabin that will run when the sub is not used. Kitty Litter is a good idea but I need something cleaner and easier to handle.

Regarding the discussion about the compass issue, I´m using a fluxgate mounted about a meter over the hatch and an electric aviation heading gyro. The fluxgate is very sensitive to magnetic underwater rocks so it can not be trusted for longer navigations.

Lasse

6 aug 2015 kl. 14:48 skrev Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org<mailto:personal_submersibles at psubs.org>>:

Are all of your electronics confined to sealed enclosures? Or are you struggling to keep the cabin humidity down?
You may have better luck condensing the moisture out with a cooling coil and draining it, rather than relying on heat to drive the %RH down, except in a truly sealed enclosure.  For enclosures that you don't need to open frequently, dessicants may suffice.
If you are only concerned about one or two specific components, you might look at aftermarket conformal coatings.  These can raise moisture tolerance to 100% RH non-condensing for many components.
Sean

On August 5, 2015 9:11:10 AM CDT, Lasse Schmidt via Personal_Submersibles <personal_submersibles at psubs.org<mailto:personal_submersibles at psubs.org>> wrote:

Hey guys,

I´m looking for heating elements to mount in our electronic boxes and remote. Any pointers what to search for and where? I´m not even sure how they look like.

We have so far almost 250 dives with Malen this year, after the worst summer in decades with tons of rain in Sweden we´ll try to fight the moisture with some heating elements and a dehumidifier in the sub. The electronics does´t like to moisture for sure. All suggestions are super welcome.

Cheers, Lasse

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