[PSUBS-MAILIST] Gauge for outside viewport?

[Private via Personal_Submersibles]

I did, but ended up just putting them inside. There's less to go wrong or be maintained with a welded through-hull than with a pressure proof enclosure.

Best,

Alec



> On Oct 15, 2015, at 5:49 PM, Pete Niedermayr via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alec, Have you thought about making a 1atm enclosure for you gauges ?
> 
> Pete
> --------------------------------------------
> On Sun, 9/20/15, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Subject: [PSUBS-MAILIST] Gauge for outside viewport?
> To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
> Date: Sunday, September 20, 2015, 10:03 PM
> 
> I have an interesting
> thing to think about and wondered if any of the PSUBS brain
> trust might have a suggestion.
> One of the simplifications on my new sub is that
> all HP air lines are external, aside from the BIBS (which is
> normally shut off anyway). Thus, I'm looking for a
> 3,000-4,000 psi gauge to mount outside a viewport, like in
> the Pisces photo that I'll paste below. In case my paste
> doesn't come through, it is the one at the top of the
> following article: http://www.nytimes.com/2015/09/15/science/piloted-deep-sea-research-is-bottoming-out.html?_r=1
> The first thing that came to mind was to use a
> SCUBA submersible pressure gauge, but the problem is these
> are normally 1 atm dry enclosures of limited depth rating.
> There is generally little information posted about how deep
> they'll go, but what I did find was mentioned 260 feet
> for the plastic ones and 490 feet for the brass variety.
> This is a 1,000 foot sub.
> The second idea was to use oil filled gauges
> intended for above-water use. But these generally have
> considerable bubbles in the oil, are not very good at
> keeping the oil inside, and have other hardware not intended
> to live long in sea water.
> Any suggestions would be most welcome!
> 
> 
> Thanks,
> Alec 
> 
> 
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