[PSUBS-MAILIST] Electronics contents gauge

[Alan James via Personal_Submersibles]

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 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] 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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