[PSUBS-MAILIST] Electronics contents gauge

Mon Oct 31 19:06:25 EDT 2016

James,
great catalogue. I have just had it printed & bound as a reference
for what's available.
Alan

Sent from my iPad

> On 31/10/2016, at 11:26 pm, James Frankland via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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] 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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