[PSUBS-MAILIST] Electronics contents gauge
Alan via Personal_Submersibles
personal_submersibles at psubs.org
Mon Oct 31 05:46:39 EDT 2016
Thanks River,
unfortunately McMaster Carr doesn't sell to N.Z. & Australia, possibly the rest
of the World also. There have been several items I have wanted to buy from them.
I will flick President Trump an email ( on the correct server ) about this as the Chinese
have the edge over you guys here.
I liked these small profile units as I will need at least 4 on my through-hull plate.
https://www.mcmaster.com/#pressure-transducers/=14u0jxl
Cheers Alan
Sent from my iPad
> On 31/10/2016, at 6:31 pm, River Dolfi via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
> Just a quick look in the McMaster Carr catalog reveals 0-5000 psi pressure transducers. 1/4" NPT, all stainless with an 11,000 psi max pressure. I doubt they're rated for O2 though. If you're concerned about leaks, I wouldn't bother with the 1/8 tube, but instead put a second, much smaller, flow control orifice upstream from the bulkhead. A .01" diameter orifice gives you about .426 cfm at 3000psi. Then have a ball valve immediately coming off your bulkhead followed by the pressure transducer.
>
>
> On Oct 30, 2016 11:55 PM, "via Personal_Submersibles" <personal_submersibles at psubs.org> wrote:
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> 1. Re: Electronics contents gauge
> (Alan James via Personal_Submersibles)
> 2. Re: Electronics contents gauge
> (Stephen Fordyce via Personal_Submersibles)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 31 Oct 2016 01:04:58 +0000 (UTC)
> From: Alan James via Personal_Submersibles
> <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion
> <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Electronics contents gauge
> Message-ID: <2109399614.868898.1477875898277 at mail.yahoo.com>
> Content-Type: text/plain; charset="utf-8"
>
> Thanks Emile & Steve.I may combine both suggestions.I am wanting to put my penetrations through a removeable platea 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 gaugelooks like the right option.I like the idea of the 1/8th tube. I couldn't find a flow rate anywherefor a 1st stage hp port. May have to flow it in to a plastic bag & get anestimate, 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 ? ?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] 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 the1st stage regulator & has wires off it that I can run through a throughhull 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 throughhull & have an electronic pressure gauge threaded in to this from the inside of the hull. However with the second method, I wouldn't havea shut off valve if the pressure gauge failed some how.Alan
> ?
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> Message: 2
> Date: Mon, 31 Oct 2016 14:53:49 +1100
> From: Stephen Fordyce via Personal_Submersibles
> <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion
> <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Electronics contents gauge
> Message-ID:
> <CAAzgXiNU_nw8bxJigff==V1ZGV+ech4DTnGrovRb-VcwbQmW+A at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> 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 ? ?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
> >
> >
> >
> > ______________________________ _________________
> > Personal_Submersibles mailing list
> > Personal_Submersibles at psubs. org <Personal_Submersibles at psubs.org>
> > http://www.psubs.org/mailman/ listinfo.cgi/personal_ submersibles
> > <http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles>
> >
> >
> >
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> > Personal_Submersibles mailing list
> > Personal_Submersibles at psubs.org
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> >
> >
> >
> > _______________________________________________
> > Personal_Submersibles mailing list
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