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Thank you very much for your reply. I did manage to isolate the ADV as the source of the loop intrusion and solved the loop integrity problem.

On my last dive weekend I was unable to get my RB into the water due to my negative test failing. Tracing a Positive leak is possible by utilizing a soapy spray and observing for bubbles. What steps are recommended to quickly trace a negative loop test failure?

Cancelled. Moved to General Diving Forum

This statement is based on the ExtendAir Reactive based Cartridges (RPC) by Micropore research as stated in their documentation. In short it claims that due to the design of the scrubber (Air Flow Channels and density of absorbent material) "At a minimum, duration is improved by 25%". Also...

They also have added optional BMCL (Back Mounted Counter Lungs) as well as the addition of a BOV.

I have consequently changed to diving a Shearwater. Thank you all for your suggestions.

I converted my unit to BMCL (Back-mounted Counter Lungs). The inflation valves I use have a rotating omni-directional plugin valve which I use for both offboard O2 & Dil. I think the best way to use off board Inflation would be to utilize a longer hose which can be fed securely to the wing...

Due to the inaccuracy of scrubber performance filled with sorb, both of my RB's types I dive are using pre-packed cartridges. These cartridges are very accurate re packing & ,consequently, performance. Since we cannot accurately measure CO2 in the loop as yet, (development in progress) it is...

When I bought my RB I opted to have a 4th cell connection port drilled into my head. The computer I would like to plumb into the 4th cell is a VR NEOH3. The connection cable required is an Optocon cable (which I guess is an acronym for Optical Connection). The cable is therefore not a 9 pin...

Apologies for the mistake. The unit does use a type of EAC cartridge. I will edit my post.

Thank you for the detailed Incident report, GLOC. This is the kind of info I find extremely valuable on a forum. I am glad that this incident was managed and did not turn into an accident. I am impressed with the OC diver which managed the ascent, well done. My thoughts as I was reading this...

I am diving my O2ptima for 65 hours / 2 years now (in Namibia/Africa) and here is is summary of my experience on the unit: 1) Backup: DR and HH gave me excellent support / advise during my problem phase regarding electronics. Living in a remote location like Africa this is an important buying...

Welcome to CCR Explorers Clint. A story well told. Things get really busy in the beginning. Recently I had the opportunity to dive for 4 days at a site 550 km away. The ordered sorb was late so I was forced into OC diving again. I just could not bear the thought of diving this cold, noisy way...

Hi Jon I have used the Analox ATA for over 3 years and it's accuracy is comparable to all the other Helium Analysers we use. Uwe

Thank you for a great test report. Since my O2ptima uses similar components as the HH regarding loop design and my unit features a Shrimp BOV as well, I feel I can extrapolate your findings wrt to loop performance. What I wish DR would offer that is available for the HH is the option of...

I think the best time to simulate a bailout scenario would be when the bailout cylinders require a visual or hydro test. However the way I simulate a planned bailout situation without actually using the bailout gasses is after a dive when I am out of Deco. Turning the lever of the BOV is simple...

Having dived most diving systems available to the recreational diver today (Sport OC, Tech OC, Side-Mount, CCR) I was exposed to a lot of course material content and requirements. I always get into trouble with an instructor who forces me into procedures or theory which is outdated or has been...

A long time ago (11/09/2010) I was diving twin 15's Air with an Isolation manifold with a 50/18 and O2 decompression gasses. After completing 2 dives I was asked to demonstrate to a student a 40m decompression dive. The student was on a Air with a 12 L sport equipment . Since I had about 120...

Can you tell us the reason for selling the unit?

Hi Keith Welcome & great meeting another O2ptima Diver on this forum. I hope that you have as much fun with the unit as I am having.