[PSUBS-MAILIST] Pressure Transducer

[Alan James via Personal_Submersibles]

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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