[PSUBS-MAILIST] Electronics contents gauge

Mon Oct 31 06:26:31 EDT 2016

Hi Alan,

About half way down in this catalogue.  Digital O2 clean gauges.  Takes a
bit of a while to download.
http://www.undersea.uk.com/catalogue/catalogue.pdf

Regards
James

On 31 October 2016 at 10:07, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Thanks Steve,
> I'll have a think about this one. In my small cabin a failure could be
> fatal.
> With the transmitter's pressure rating it is not likely to burst apart; it
> would be more
> likely that it leaked because of poor sealing. I doubt this would be major
> though.
> Cheers Alan
>
> Sent from my iPad
>
> On 31/10/2016, at 4:53 pm, Stephen Fordyce via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi Alan
> Yep, my pressure transmitter is suitable for oxygen (and is ranged
> 0-400bar).
>
> A SCUBA reg HP port usually has an orifice built-in to restrict flow in
> the event of hose failure.  But with even 100bar behind it, the tank will
> still empty in a matter of minutes - pretty significant.  Having the
> prolonged restriction of a long skinny tube will help a bit, but a total
> failure would still put out a lot of gas.
>
> Cheers,
> Steve
>
> On Mon, Oct 31, 2016 at 12:04 PM, Alan James via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Thanks Emile & Steve.
>> I may combine both suggestions.
>> I am wanting to put my penetrations through a removeable plate
>> a la Deep Worker. It will be behind me in my 1 person submersible;
>> so a pressure transmitter with wires coming from it rather than a gauge
>> looks like the right option.
>> I like the idea of the 1/8th tube. I couldn't find a flow rate anywhere
>> for a 1st stage hp port. May have to flow it in to a plastic bag & get an
>> estimate, to see if a failure would be an issue anyway.
>>    Steve, are those pressure transmitters suitable for oxygen?
>> Cheers Alan
>>
>>
>>
>> ------------------------------
>> *From:* Stephen Fordyce via Personal_Submersibles <
>> personal_submersibles at psubs.org>
>> *To:* Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> *Sent:* Monday, October 31, 2016 12:34 PM
>> *Subject:* Re: [PSUBS-MAILIST] Electronics contents gauge
>>
>> Hi Alan,
>> I have pressure transmitters (similar to many commonly used in
>> industry) that could probably be adapted for that - see attached
>> photos.  You could replace the end section with a small penetrator/cable
>> gland plate.  It needs a power supply of 6-30VDC and outputs 0.5-4.5V or
>> 4-20mA (both linear).  They are NPT so you'd need an adaptor for the
>> SCUBA HP port - but a 1/4" Swagelok thread will fit.
>>
>> I imagine you're worried about leaks of HP inside, and maybe cost as
>> well.  Something you may not have thought of is running 1/8" SS tube.  It's
>> soft enough to bend by hand (more like stiff solid-core electrical cable
>> than 1/4" tube) and can be run in a bundle with cables.  Also available in
>> very small inside diameters so flow is greatly restricted.  I've had good
>> success using it for remote gauge lines.
>>
>> I also have digital HP oxygen pressure gauges if you ever need one of
>> those :).
>>
>> Shoot me an email at Stephen.fordyce at tfmengineering.com.au if you're
>> interested in one - list price is AU$198.
>>
>> Cheers,
>> Steve
>> (TFM Engineering Australia)
>>
>> On Mon, Oct 31, 2016 at 7:19 AM, emile via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> The scuba pressure sensors are wireless. Most scuba divers don’t want it
>> as it is unreliable.
>>
>> Best would be to screw a industrial pressure sensor (with ¼ “thread or
>> so) into the penetrator plate and attach a HP line on the outside.
>>
>>
>> Br, Emile
>>
>> *Van:* Personal_Submersibles [mailto:personal_submersibles-
>> bounces at psubs.org <personal_submersibles-bounces at psubs.org>] *Namens *Alan
>> James via Personal_Submersibles
>> *Verzonden:* zondag 30 oktober 2016 21:02
>> *Aan:* Personal Submersibles General Discussion
>> *Onderwerp:* [PSUBS-MAILIST] Electronics contents gauge
>>
>> Is there a suitable electronic scuba tank contents gauge out there?
>> I am after something that plugs in to the high pressure port of the
>> 1st stage regulator & has wires off it that I can run through a through
>> hull so I can display the tank contents pressure on a screen.
>> Trying to avoid bringing high pressure in to the hull.
>> An alternative may be to run a high pressure line to a through
>> hull & have an electronic pressure gauge threaded in to this from the
>> inside of the hull. However with the second method, I wouldn't have
>> a shut off valve if the pressure gauge failed some how.
>> Alan
>>
>>
>>
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