[PSUBS-MAILIST] Pressure Transducer

[Alec Smyth via Personal_Submersibles]

Maybe a ring shaped piece to be sandwiched between the transducer and the
regulator, and with an O ring on each side of it. Although you'll be
getting into jewelry scale machining at that point, probably not too easy.
But I'd say the transducer probably doesn't need to be screwed right to the
bottom, so the sandwich ring could be a little thicker than the gap shown
in your photo.


Best,

Alec

On Wed, Dec 28, 2016 at 9:58 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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