[PSUBS-MAILIST] Gauge for outside viewport?

[Steve McQueen via Personal_Submersibles]

Alec, while I am not 100% sure from the photo I believe these are standard
ss Ashcroft pressure gauges used in industry.  They are normally oil filled
to dampen the needle movement.  The oil is added through a rubber plug
normally that might also act as a compensation diaphragm. Anyway maybe a
vendor to start having discussion with.

Steve

On Sun, Sep 20, 2015 at 11:03 PM, Alec Smyth via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> 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
>
> [image: Inline image 1]
>
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