New Dolphin CCR user

buhlmann · 4th June 2006, 22:34

Hi all,
I'm a 45yo male from Sydney, Australia.
I bought my SCR Dolphin about 4 years ago and after diving it a few times I realised the limitations of SCR and pledged to convert it to electronic CCR. I designed a single sensor readout as a backup for the main electronics which were to use 3 sensors for PPO2 control and the unit will also monitor deco requirements, oxygen exposure, etc.
I installed the single sensor readout into the Dolphin whilst I worked on the main electronics, I expected this project to take about 3 months to finish, but as time wore on I realised that my timeframe was wayyyyy out.
I then decided to change the plumbing on the dolphin to CCR and attempt to dive the unit manually. My first dive with the new configuration was very tentative but it showed me that the idea was sound, and also how wonderfull diving CCR is compared to SCR. 200 dives later and the main electronics are still not finished (getting close though), however I quite enjoy flying the unit manually.
Love the forums, you guys are a wealth of info.

denzel · 5th June 2006, 10:27

Welcome!

About building your own electronics...

Feck I'm already happy if I manage to get the batteries changed from the remote..
How manually do you fly it? No CMF and only injecting manually?

denz.

buhlmann · 5th June 2006, 22:02

Hi,
I have left the drager dosage device in place and run the O2 through the orifice. I just open the cylinder valve when the ppo2 drops a little.
Its a little scary only having 1 sensor, I do a few dil flushes to verify it during the dive and I always calibrate on O2 pre dive. I avoid diving over PPO2 of 1.0 just in case sensor becomes current limited.
regards
Laurie

Scuba_Vixen · 5th June 2006, 23:54

Welcome to Rebreather World.

You'll find a lot of folks here who've converted their Dollies. There are some great links in the links section to those who have websites of their project.

There's also tons of pics and info in numerous threads detailing various aspects of conversion.

There's also a few who've built their own leccies as well.

You can't have a really custom Dolly without multiple O2 cells, digital readouts, and a hud

Post some pics of your project when you can.

Darlene

4th June 2006, 22:34	#1 (permalink)
buhlmann New Member Current Rebreather/s: Inspiration Classic Other CCR Dolphin Home Build Other Rebreather/s: Other CCR Dolphin Home Build Join Date: Jan 2006 Location: Sydney, Australia Posts: 6	New Dolphin CCR user Hi all, I'm a 45yo male from Sydney, Australia. I bought my SCR Dolphin about 4 years ago and after diving it a few times I realised the limitations of SCR and pledged to convert it to electronic CCR. I designed a single sensor readout as a backup for the main electronics which were to use 3 sensors for PPO2 control and the unit will also monitor deco requirements, oxygen exposure, etc. I installed the single sensor readout into the Dolphin whilst I worked on the main electronics, I expected this project to take about 3 months to finish, but as time wore on I realised that my timeframe was wayyyyy out. I then decided to change the plumbing on the dolphin to CCR and attempt to dive the unit manually. My first dive with the new configuration was very tentative but it showed me that the idea was sound, and also how wonderfull diving CCR is compared to SCR. 200 dives later and the main electronics are still not finished (getting close though), however I quite enjoy flying the unit manually. Love the forums, you guys are a wealth of info.
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5th June 2006, 10:27	#2 (permalink)
denzel Holiday diver Current Rebreather/s: Inspiration Classic Other Rebreather/s: Not Bought Yet Join Date: Aug 2005 Location: Perth! Posts: 358	Re: New Dolphin CCR user Welcome! About building your own electronics... Feck I'm already happy if I manage to get the batteries changed from the remote.. How manually do you fly it? No CMF and only injecting manually? denz. __________________ My deepest so far, 558.50 mtr, my rig a LF90D...
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5th June 2006, 22:02	#3 (permalink)
buhlmann New Member Current Rebreather/s: Inspiration Classic Other CCR Dolphin Home Build Other Rebreather/s: Other CCR Dolphin Home Build Join Date: Jan 2006 Location: Sydney, Australia Posts: 6	Re: New Dolphin CCR user Hi, I have left the drager dosage device in place and run the O2 through the orifice. I just open the cylinder valve when the ppo2 drops a little. Its a little scary only having 1 sensor, I do a few dil flushes to verify it during the dive and I always calibrate on O2 pre dive. I avoid diving over PPO2 of 1.0 just in case sensor becomes current limited. regards Laurie
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5th June 2006, 23:54	#4 (permalink)
Scuba_Vixen e/mCCR Dolphin Pilot Current Rebreather/s: Other CCR Home Build Other Rebreather/s: Other CCR Home Build Join Date: May 2005 Location: St. Croix USVI Posts: 557	Re: New Dolphin CCR user Welcome to Rebreather World. You'll find a lot of folks here who've converted their Dollies. There are some great links in the links section to those who have websites of their project. There's also tons of pics and info in numerous threads detailing various aspects of conversion. There's also a few who've built their own leccies as well. You can't have a really custom Dolly without multiple O2 cells, digital readouts, and a hud Post some pics of your project when you can. Darlene
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