Below was my brand new conversion of IDA-71U into O2 CMF+bypass rebreather. Recently i bought an IDA-71U for such a low cost that i can't pass by ;) At first, i want to convert it to pure O2 rebreather, and after many sleepless nights i made it!
Now this was pure O2 rebreather with constant supply of 1,5 l/mni O2
So, here we begin ;)
Overview of rebreather with CMF+bypass attached.
O2 cylinder with integrated 1st stage and low-pressure quick-seal connector by Camozzi Pneumatica, http://www.camozzi.it/camozzi/index.php?lang=en
This was only replace in original IDA-71U construction.
I think this offers more usability than original O2 cylinder connection system.
Another overview of rebreather with CMF+bypass attached.
Clearly visible all hose's wiring. Centerline can was replaced by cut-off PVC tube 110mm diameter. Counterlung inlets were sealed by brass dummy-plugs (similar to Franken-Rig).
Clean view of CMF and bypass system.
Another clean view of CMF and bypass system.
Lower left - input hose from O2 supply from original IDA-71U nitrox connector.
Vertical rectangular-shaped aluminium body - hand-made oxygen collector.
Center left bolt - hollow-body bolt for oxygen bupassing.
Upper left bolt - Camozzi SCO 604-1/8, kind of needle-valve, main part of CMF system, set to deliver 1,5 l/min O2 flow.
Lower right - output hose to purge-line.
So, when pressed, the black mushroom-shaped button at top of photo switch O2 supply line between 1.5l/min CMF and direct addition to countelung with no limitations.
Clean view on centerline can inlet plugs on countelung.
I detach purge automatics from it's hoses, and use hoses to connect
CMF+bypass, that was attached to original nitrox cylinder
connector. So, quickly i can detach bypass and revert to original IDA-71U configuration as O2 regenerative rebreather with 2 cans.
All parts except O2 collector were standart industrial pneumatic
parts from Camozzi. Conversion was quiet cost-efective - all parts (including
hand-made) cost me less than $100 ;) Device was checked in nearby
lake by 30-minutes dive on up to
But, sorry, no in-water photos available due to this was solo dive.
Water was pretty warm - 12 deg.C compared to 7 deg.C air ;) I use it with original VM-5 full-face mask as shown at http://sport.freepage.de/cgi-bin/feets/freepage_ext/339483x434877d/rewrite/rsdas/REB6BIG.HTM
Later i think to made some kind of KISS rebreather.
Also, this summer i continue diving with my IDA-72SMG, up to 1 hour
dive time and up to
No any troubles sighted.
Regards, Alexey Stekolshikow
|Alexey, thanks for sending this homebuild project for my website again!|
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