[PSUBS-MAILIST] Compass Video

Thu Jun 13 19:16:36 EDT 2019

 Waterproof Housing for Electronic Compass

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Waterproof Housing for Electronic Compass

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    On Thursday, June 13, 2019, 06:33:23 PM EDT, via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Jon can you resend the link to the compass video.  Somehow it did not come through. 
Cliff

Sent from my iPad
On Jun 13, 2019, at 1:47 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hank,that's good to hear you have had success.If you strip a section of the wire in the epoxy and use pins as you doyou have a better chance. This is what we have done in the past.In Doug's SV Seeker video on pressure testing penetrators, he has a bigfailure rate & he is using pins in the potted section.I am now coating my epoxy, part of my fitting & an inch up my wireswith my PVC glue as a flexible adhesive barrier, then molding polyeurathaneover that.Alan

On 14/06/2019, at 1:27 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Alan,I have had good luck with epoxy for potting penetrators in metal fittings.  I have pressure tested well past 1,000 psi with good success.  Gamma and E3000 both have 20 pin penetrators using casting resin and were pressure tested above 1,000 psi.  Having said that, I potted my new compass sensor with epoxy and the sensor has failed possibly.   I have not investigated completely yet.  I would have concerns now about potting electronics in epoxy.  this is my first time potting electronics,   I would recommend buying electronic specific potting material and keep using casting resin or epoxy for power penetrators.Hank
    On Thursday, June 13, 2019, 6:20:21 AM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Jon,
that was one of the most comprehensive "How to" videos I've seen.
Have one of those compasses so will emulate that.
I have reservations about epoxy sealing the wires though.
I did a lot of experiments with glues & PVC wire jackets & found a lot of
the glues disappointing. I found one product specifically for PVC boats
that stood out.
I have mentioned before that I potted a couple of wires for 1" in to a WD40
filled housing & the WD40 just ran out between the epoxy & wire jacket
without pressure. 
Under pressure I would guess that the PVC jacket would be more compressible
than the  epoxy resin around it & would tear away from it, letting water in.
Suggest epoxying the whole board both sides & the wires where they are 
soldered on, in case of water egress.
I have strong reservations about the epoxy sticking to the PVC pipe also.
I would be interested in others opinions on this as potting wires is 
something we are doing a lot of.
Alan

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