[PSUBS-MAILIST] Gauge for outside viewport?

[Stephen Fordyce via Personal_Submersibles]

Hi Alec,
Yep, I'm definitely speaking of submersible pressure gauges (SPG).  I have
these ones, or at least very similar:
http://www.deepstop.de/en/deepstop-products/1144-deepstop-300-bar-oxy-minera-spg.html?search_query=gauge&results=32

Possibly it's the "minera" or "mineral" keyword you're looking for.

I have friends that occasionally dive to 200m and they've not reported SPG
problems.

Cheers,
Steve


On Mon, Sep 21, 2015 at 10:12 PM, Alec Smyth via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> 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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>>>
>>>
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>
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