[PSUBS-MAILIST] Gauge for outside viewport?

[Alec Smyth via Personal_Submersibles]

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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