[PSUBS-MAILIST] Pressure Transducer

[via Personal_Submersibles]

If it were me I would machine out the conical section and then machine off enough of the 10mm threaded shank until it will mate.  

Actually i would abandon this approach altogether and put the pressure transmitters inside the boat and use Swagelok fittings and ss tubing to connect to regulator.

O-ring seals are designed for high pressure.  Likelihood of leak into boat is small.
 
Cliff


Cliff Redus

> On Dec 28, 2016, at 8:58 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hank,
> yes it has a hole down the middle of the threaded fitting.
> I only have 10mm of thread. I could machine a few mm off the end but still
> wouldn't have a flat area to squash the o-ring against. The female fitting is slightly
> tapered initially, & the o-ring is meant to fit in to this taper.
> If I put a nut on as a spacer, the internal face of the o-ring would be against the thread,
> & high pressure air could leak down between the thread & nut.
> Alan
> 
> 
> From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
> Sent: Thursday, December 29, 2016 3:15 PM
> Subject: Re: [PSUBS-MAILIST] Pressure Transducer
> 
> Alan,
> I assume the threaded shaft is just a means of attaching it with a hole in the middle.  If so, file it shorter,  put a nut on the tread first and the nut will fix the end of the tread when you remove it.
> Hank
> 
> 
> On Wednesday, December 28, 2016 6:47 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Just received my 6 pressure transducers from China.
> These were tailor made for me to fit in to the high pressure port
> of my first stage regulator; So rather than have high pressure air
> & oxygen coming through the hull wall, I just have wires.
>    Unfortunately it looks like they have got it wrong. They have a conical
> portion at the base of the male thread that makes it impossible to seal
> with an O-ring. I specified 10mm for thread & shank, but the 3mm extra
> on the conical portion means the flat faces of the pressure transmitter &
> regulator can't meet. Other than that it looks ideal for potting the wires.
>    Any suggestions for a fix on this, other than sending them back?
> I could possibly turn the conical portion down & stack washes under the
> o-ring. The fit was also a bit sloppy, but so was the original plug that was
> in this high pressure port. Not sure if this is normal or not.
> See attached photos, thanks.
> Alan
> 
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