[PSUBS-MAILIST] Electronics contents gauge

[Stephen Fordyce via Personal_Submersibles]

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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