[PSUBS-MAILIST] Gauge for outside viewport?

[Alec Smyth via Personal_Submersibles]

Hi Steve,

I have three of them on hand and all three are 1 atm air filled enclosures.
Note that SCUBA depth gauges are oil filled, but I'm speaking of SCUBA tank
pressure gauges. I do know oil filled ones exist, I just have not found any
of that sort yet.

Thanks,

Alec

On Sun, Sep 20, 2015 at 11:21 PM, Stephen Fordyce via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:

> Hi Alec,
> SCUBA gauges are actually oil filled (I have broken a few) and as far as I
> know have been taken unmodified on record dives as deep as 300m/1000ft,
> with no problems recorded.
>
> Cheers,
> Steve
> On 21/09/2015 1:04 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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