[PSUBS-MAILIST] Pressure Transducer

Wed Dec 28 23:54:05 EST 2016

Thanks Alec,yes that may work, but as you say the fine machining may be a bit tedious on 6 of them.   I will email the company & offer to send them a first stage regulatorwith their pressure transducers so they can get it right!   I think it will be worth getting it right as it may be useful to other Psubbersin the future & the manufacturer could market it to the diving industry for gas mixing set ups. If they wanted.Cheers Alan

      From: Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Thursday, December 29, 2016 5:22 PM
 Subject: Re: [PSUBS-MAILIST] Pressure Transducer

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 stillwouldn't have a flat area to squash the o-ring against. The female fitting is slightlytapered 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 portof 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 conicalportion at the base of the male thread that makes it impossible to sealwith 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 theo-ring. The fit was also a bit sloppy, but so was the original plug that wasin this high pressure port. Not sure if this is normal or not.See attached photos, thanks.Alan
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