CCR Dolphin Project

Scuba_Vixen · 16th May 2005, 00:22

Hi again,

Thought I'd continue where we left off in "meet and greet" over here. I figured this would be a more appropriate forum. If you mods think there's a more specific thread it should be in, just transplanr it.

I have a couple questions that I know you all can answer for me.

While I'm getting the conversion parts together, I'd like to be able to use the Dolphins in scr mode after I refurb them. I'd like to be able to use 30/30 instead of nitrox. (nice wrecks at about 100') ... Is my limited understanding correct in that all I'd essentially have to do would be to scale my flowmeter for 30/30 and then come up with the proper orifice sizing? .... I've seen some who didn't think you could flow trimix thru a sonic orifice, but then I've seen others who I considered very knowledgable in the area, who said it's no problem.

The other question revolves around the PO2 monitoring.

I was not at all impressed with the oxygage, which is why I want something better, as opposed to replacing the bad ones.

I'm wanting something that will work in scr mode, to use while I'm getting parts together, but that will carry over and be useful as redundant display after conversion.

I was thinking of the assembly from HSE with the sensor and cable and all that would plug into the oxygage fitting and my explorer.

Would that be a good choice, or does it have a single O ring and the same leak issues as the oxygage at depth?

It's better to do what's right the first time, than to go back and upgrade the upgrades that weren't good enough.

Anyway, that's probably enough questions for one post, ...

Looking forward to your feedback.

Darlene

**wedivebc** · 16th May 2005, 01:49

Quote: (Originally Posted by Scuba_Vixen)

Hi again,

Thought I'd continue where we left off in "meet and greet" over here. I figured this would be a more appropriate forum. If you mods think there's a more specific thread it should be in, just transplanr it.

I have a couple questions that I know you all can answer for me.

While I'm getting the conversion parts together, I'd like to be able to use the Dolphins in scr mode after I refurb them. I'd like to be able to use 30/30 instead of nitrox. (nice wrecks at about 100') ... Is my limited understanding correct in that all I'd essentially have to do would be to scale my flowmeter for 30/30 and then come up with the proper orifice sizing? .... I've seen some who didn't think you could flow trimix thru a sonic orifice, but then I've seen others who I considered very knowledgable in the area, who said it's no problem.

The other question revolves around the PO2 monitoring.

I was not at all impressed with the oxygage, which is why I want something better, as opposed to replacing the bad ones.

I'm wanting something that will work in scr mode, to use while I'm getting parts together, but that will carry over and be useful as redundant display after conversion.

I was thinking of the assembly from HSE with the sensor and cable and all that would plug into the oxygage fitting and my explorer.

Would that be a good choice, or does it have a single O ring and the same leak issues as the oxygage at depth?

It's better to do what's right the first time, than to go back and upgrade the upgrades that weren't good enough.

Anyway, that's probably enough questions for one post, ...

Looking forward to your feedback.

Darlene

The HSE is sealed internally and even if you pulled the plug under water it would not flood. I use an explorer and a backup monitor from www.ppo2.com

When selecting gasses for scr diving remember your loop will not actually get up to the fo2 in your carry gas. As such for a 100ft dive I would choose a 40% o2 mix since depending on the work load the actual ppo2 in the loop would never reach 1.6 at that depth.
I have never used my dolphin in scr mode below 130ft so I would not use helium for a shallow dive like that either, I can't comment on the trimix flow issue.

have a look here for some conversion ideas www.tmishop.com

Scuba_Vixen · 16th May 2005, 03:58

Quote: (Originally Posted by wedivebc)

The HSE is sealed internally and even if you pulled the plug under water it would not flood. I use an explorer and a backup monitor from www.ppo2.com

When selecting gasses for scr diving remember your loop will not actually get up to the fo2 in your carry gas. As such for a 100ft dive I would choose a 40% o2 mix since depending on the work load the actual ppo2 in the loop would never reach 1.6 at that depth.
I have never used my dolphin in scr mode below 130ft so I would not use helium for a shallow dive like that either, I can't comment on the trimix flow issue.

have a look here for some conversion ideas www.tmishop.com

I'm still used to thinking in OC terms, I promise I'll get better. I understand what you're saying about FO2 and FiO2. ..... I'm just used to thinking in terms of net O2 percentage inspired, which would be FiO2.

The leakage I was worried about was at the P port where the sensor assembly goes into the bag.

So far, all the conversions I've seen are KISS type manual addition. ... Has anyone done anything with control electronics and a solenoid valve? .... Or is the Dolphin just not a suitable platform to get that advanced with?

Oopppps, there I go with more questions again already,

Darlene

**wedivebc** · 16th May 2005, 06:05

Quote: (Originally Posted by Scuba_Vixen)

I'm still used to thinking in OC terms, I promise I'll get better. I understand what you're saying about FO2 and FiO2. ..... I'm just used to thinking in terms of net O2 percentage inspired, which would be FiO2.

The leakage I was worried about was at the P port where the sensor assembly goes into the bag.

So far, all the conversions I've seen are KISS type manual addition. ... Has anyone done anything with control electronics and a solenoid valve? .... Or is the Dolphin just not a suitable platform to get that advanced with?

Oopppps, there I go with more questions again already,

Darlene

Keep the questions coming. Lots of answers on this board. If you are worried about 1 O-ring in the p-port it's no biggie since you are at ambient pressure in the CL I mentioned that 1 o-ring in the oxygauge head has been an ongoing problem for people especially at depths greater than 150ft.
I use a KISS valve on mine and I like the simplicity. I will be starting my YBOD course next weekend so I will have another syetm to compare to. Right now I am approaching 100 dives on the Dolphin with about 40 of them in ccr mode.

divetheworld · 18th May 2005, 19:29

Quote: (Originally Posted by Scuba_Vixen)

Hi again,

Thought I'd continue where we left off in "meet and greet" over here. I figured this would be a more appropriate forum. If you mods think there's a more specific thread it should be in, just transplanr it.

I have a couple questions that I know you all can answer for me.

While I'm getting the conversion parts together, I'd like to be able to use the Dolphins in scr mode after I refurb them. I'd like to be able to use 30/30 instead of nitrox. (nice wrecks at about 100') ... Is my limited understanding correct in that all I'd essentially have to do would be to scale my flowmeter for 30/30 and then come up with the proper orifice sizing? .... I've seen some who didn't think you could flow trimix thru a sonic orifice, but then I've seen others who I considered very knowledgable in the area, who said it's no problem.

The other question revolves around the PO2 monitoring.

I was not at all impressed with the oxygage, which is why I want something better, as opposed to replacing the bad ones.

I'm wanting something that will work in scr mode, to use while I'm getting parts together, but that will carry over and be useful as redundant display after conversion.

I was thinking of the assembly from HSE with the sensor and cable and all that would plug into the oxygage fitting and my explorer.

Would that be a good choice, or does it have a single O ring and the same leak issues as the oxygage at depth?

It's better to do what's right the first time, than to go back and upgrade the upgrades that weren't good enough.

Anyway, that's probably enough questions for one post, ...

Looking forward to your feedback.

Darlene

Firstly, if you want to use different gases with the Dolphin in SCR mode then visit my page here and look at this spreadsheet.
http://homepage.ntlworld.com/brent.h...rebreather.htm

PPO2 monitoring. My advise is simple and sucsinct. VR3 C4 with the C8a upgrade. Use it in OC Nitrox mode with the external cell activated for SCR. Switch to CCR when your ready.

Never had an O ring problem with a P port yet. Full confidence in them. And if it goes breasts up, no problem. Fix or bail.

montyg · 19th May 2005, 06:36

Perhaps consider this for PPO2 monitoring: http://insane.bug-e.net/Puffer/PPO2/index.html

rgds
monty

Scuba_Vixen · 19th May 2005, 10:44

Quote: (Originally Posted by montyg)

Perhaps consider this for PPO2 monitoring: http://insane.bug-e.net/Puffer/PPO2/index.html

rgds
monty

Nice PO2 monitoring setup for sure!

That fellow made himself a damn fine Rebreather to boot!

Darlene

Scuba_Vixen · 20th May 2005, 06:12

Well, It's now an "Official Project"

I brought home this lovely pair of Dolphins last night .....

Now the fun begins ..

I swapped my old '86 Nissan 4X4 Pickup for them.

The dive shop owner doesn't have to use his own late model personal truck to launch the ribs any more, there fore ruining it in short order in the salt water....

And I get to come over to the "Dark Side".

Here's the first pics;

Darlene

***caveseeker7*** · 20th May 2005, 06:36

Nice going, Darlene, congratulations.

sensor330 · 20th May 2005, 06:37

Quote: (Originally Posted by Scuba_Vixen)

I'm still used to thinking in OC terms, I promise I'll get better. I understand what you're saying about FO2 and FiO2. ..... I'm just used to thinking in terms of net O2 percentage inspired, which would be FiO2.

The leakage I was worried about was at the P port where the sensor assembly goes into the bag.

So far, all the conversions I've seen are KISS type manual addition. ... Has anyone done anything with control electronics and a solenoid valve? .... Or is the Dolphin just not a suitable platform to get that advanced with?

Oopppps, there I go with more questions again already,

Darlene

Your talking apples and oranges now, unless your a wiss kid at electronics you would be better off buying a off-the-self E-CCR. Buying and assembling parts for a Dolphin E-CRR could get expensive, especially when you screw something up or if your trying to figure out what you need by trial and error. Since you live in the US buying a second hand E-CCR should cost you around $4500.

16th May 2005, 00:22	#1 (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	CCR Dolphin Project Hi again, Thought I'd continue where we left off in "meet and greet" over here. I figured this would be a more appropriate forum. If you mods think there's a more specific thread it should be in, just transplanr it. I have a couple questions that I know you all can answer for me. While I'm getting the conversion parts together, I'd like to be able to use the Dolphins in scr mode after I refurb them. I'd like to be able to use 30/30 instead of nitrox. (nice wrecks at about 100') ... Is my limited understanding correct in that all I'd essentially have to do would be to scale my flowmeter for 30/30 and then come up with the proper orifice sizing? .... I've seen some who didn't think you could flow trimix thru a sonic orifice, but then I've seen others who I considered very knowledgable in the area, who said it's no problem. The other question revolves around the PO2 monitoring. I was not at all impressed with the oxygage, which is why I want something better, as opposed to replacing the bad ones. I'm wanting something that will work in scr mode, to use while I'm getting parts together, but that will carry over and be useful as redundant display after conversion. I was thinking of the assembly from HSE with the sensor and cable and all that would plug into the oxygage fitting and my explorer. Would that be a good choice, or does it have a single O ring and the same leak issues as the oxygage at depth? It's better to do what's right the first time, than to go back and upgrade the upgrades that weren't good enough. Anyway, that's probably enough questions for one post, ... Looking forward to your feedback. Darlene
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16th May 2005, 01:49	#2 (permalink)
wedivebc Dave Tomblin Current Rebreather/s: Megalodon Other CCR Other Rebreather/s: Not Bought Yet Inspiration Classic Sport Kiss Other CCR Join Date: Feb 2005 Location: Vancouver Island BC Canada Posts: 1,444	Quote: (Originally Posted by Scuba_Vixen) Hi again, Thought I'd continue where we left off in "meet and greet" over here. I figured this would be a more appropriate forum. If you mods think there's a more specific thread it should be in, just transplanr it. I have a couple questions that I know you all can answer for me. While I'm getting the conversion parts together, I'd like to be able to use the Dolphins in scr mode after I refurb them. I'd like to be able to use 30/30 instead of nitrox. (nice wrecks at about 100') ... Is my limited understanding correct in that all I'd essentially have to do would be to scale my flowmeter for 30/30 and then come up with the proper orifice sizing? .... I've seen some who didn't think you could flow trimix thru a sonic orifice, but then I've seen others who I considered very knowledgable in the area, who said it's no problem. The other question revolves around the PO2 monitoring. I was not at all impressed with the oxygage, which is why I want something better, as opposed to replacing the bad ones. I'm wanting something that will work in scr mode, to use while I'm getting parts together, but that will carry over and be useful as redundant display after conversion. I was thinking of the assembly from HSE with the sensor and cable and all that would plug into the oxygage fitting and my explorer. Would that be a good choice, or does it have a single O ring and the same leak issues as the oxygage at depth? It's better to do what's right the first time, than to go back and upgrade the upgrades that weren't good enough. Anyway, that's probably enough questions for one post, ... Looking forward to your feedback. Darlene The HSE is sealed internally and even if you pulled the plug under water it would not flood. I use an explorer and a backup monitor from www.ppo2.com When selecting gasses for scr diving remember your loop will not actually get up to the fo2 in your carry gas. As such for a 100ft dive I would choose a 40% o2 mix since depending on the work load the actual ppo2 in the loop would never reach 1.6 at that depth. I have never used my dolphin in scr mode below 130ft so I would not use helium for a shallow dive like that either, I can't comment on the trimix flow issue. have a look here for some conversion ideas www.tmishop.com __________________ Cheers, Dave.... Man is the only animal burdened with the knowledge he will eventually die
(Online)

16th May 2005, 03:58	#3 (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	Quote: (Originally Posted by wedivebc) The HSE is sealed internally and even if you pulled the plug under water it would not flood. I use an explorer and a backup monitor from www.ppo2.com When selecting gasses for scr diving remember your loop will not actually get up to the fo2 in your carry gas. As such for a 100ft dive I would choose a 40% o2 mix since depending on the work load the actual ppo2 in the loop would never reach 1.6 at that depth. I have never used my dolphin in scr mode below 130ft so I would not use helium for a shallow dive like that either, I can't comment on the trimix flow issue. have a look here for some conversion ideas www.tmishop.com I'm still used to thinking in OC terms, I promise I'll get better. I understand what you're saying about FO2 and FiO2. ..... I'm just used to thinking in terms of net O2 percentage inspired, which would be FiO2. The leakage I was worried about was at the P port where the sensor assembly goes into the bag. So far, all the conversions I've seen are KISS type manual addition. ... Has anyone done anything with control electronics and a solenoid valve? .... Or is the Dolphin just not a suitable platform to get that advanced with? Oopppps, there I go with more questions again already, Darlene
(Offline)

16th May 2005, 06:05	#4 (permalink)
wedivebc Dave Tomblin Current Rebreather/s: Megalodon Other CCR Other Rebreather/s: Not Bought Yet Inspiration Classic Sport Kiss Other CCR Join Date: Feb 2005 Location: Vancouver Island BC Canada Posts: 1,444	Quote: (Originally Posted by Scuba_Vixen) I'm still used to thinking in OC terms, I promise I'll get better. I understand what you're saying about FO2 and FiO2. ..... I'm just used to thinking in terms of net O2 percentage inspired, which would be FiO2. The leakage I was worried about was at the P port where the sensor assembly goes into the bag. So far, all the conversions I've seen are KISS type manual addition. ... Has anyone done anything with control electronics and a solenoid valve? .... Or is the Dolphin just not a suitable platform to get that advanced with? Oopppps, there I go with more questions again already, Darlene Keep the questions coming. Lots of answers on this board. If you are worried about 1 O-ring in the p-port it's no biggie since you are at ambient pressure in the CL I mentioned that 1 o-ring in the oxygauge head has been an ongoing problem for people especially at depths greater than 150ft. I use a KISS valve on mine and I like the simplicity. I will be starting my YBOD course next weekend so I will have another syetm to compare to. Right now I am approaching 100 dives on the Dolphin with about 40 of them in ccr mode. __________________ Cheers, Dave.... Man is the only animal burdened with the knowledge he will eventually die
(Online)

18th May 2005, 19:29	#5 (permalink)
divetheworld Dive porn pimp Current Rebreather/s: Inspiration Classic Other CCR Other Rebreather/s: Not Bought Yet Inspiration Classic Inspiration Vision Classic Kiss Other CCR Join Date: Mar 2005 Location: Leeds, England Posts: 1,586	Quote: (Originally Posted by Scuba_Vixen) Hi again, Thought I'd continue where we left off in "meet and greet" over here. I figured this would be a more appropriate forum. If you mods think there's a more specific thread it should be in, just transplanr it. I have a couple questions that I know you all can answer for me. While I'm getting the conversion parts together, I'd like to be able to use the Dolphins in scr mode after I refurb them. I'd like to be able to use 30/30 instead of nitrox. (nice wrecks at about 100') ... Is my limited understanding correct in that all I'd essentially have to do would be to scale my flowmeter for 30/30 and then come up with the proper orifice sizing? .... I've seen some who didn't think you could flow trimix thru a sonic orifice, but then I've seen others who I considered very knowledgable in the area, who said it's no problem. The other question revolves around the PO2 monitoring. I was not at all impressed with the oxygage, which is why I want something better, as opposed to replacing the bad ones. I'm wanting something that will work in scr mode, to use while I'm getting parts together, but that will carry over and be useful as redundant display after conversion. I was thinking of the assembly from HSE with the sensor and cable and all that would plug into the oxygage fitting and my explorer. Would that be a good choice, or does it have a single O ring and the same leak issues as the oxygage at depth? It's better to do what's right the first time, than to go back and upgrade the upgrades that weren't good enough. Anyway, that's probably enough questions for one post, ... Looking forward to your feedback. Darlene Firstly, if you want to use different gases with the Dolphin in SCR mode then visit my page here and look at this spreadsheet. http://homepage.ntlworld.com/brent.h...rebreather.htm PPO2 monitoring. My advise is simple and sucsinct. VR3 C4 with the C8a upgrade. Use it in OC Nitrox mode with the external cell activated for SCR. Switch to CCR when your ready. Never had an O ring problem with a P port yet. Full confidence in them. And if it goes breasts up, no problem. Fix or bail. __________________ Attitude and self praise is no reccomendation. Dont try to be a great man, just be a man and let history be the judge of you. CHECK OUT OUR INTERWEBS FOR CUSTOM REBREATHER UPGRADES *WWW.NARKEDAT90.CO.UK* *http://www.grpservices.com/pursuit/* Supporting Shearwater Research Products in Europe
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19th May 2005, 06:36	#6 (permalink)
montyg Monty Guest Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Feb 2007 Location: Cape Town, South Africa Posts: 229	Perhaps consider this for PPO2 monitoring: http://insane.bug-e.net/Puffer/PPO2/index.html rgds monty
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19th May 2005, 10:44	#7 (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	Quote: (Originally Posted by montyg) Perhaps consider this for PPO2 monitoring: http://insane.bug-e.net/Puffer/PPO2/index.html rgds monty Nice PO2 monitoring setup for sure! That fellow made himself a damn fine Rebreather to boot! Darlene
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20th May 2005, 06:36	#9 (permalink)
*caveseeker7* Who loves ya, baby Current Rebreather/s: Sport Kiss Other Rebreather/s: Prism Topaz Join Date: Jan 2005 Location: Too far from Neverland Posts: 5,451	Nice going, Darlene, congratulations. __________________ Cheers Stefan "Political Correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.!"
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20th May 2005, 06:37	#10 (permalink)
sensor330 Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Not Bought Yet Inspiration Classic Join Date: Feb 2005 Location: Victoria, British Columbia, Canada Posts: 585	Quote: (Originally Posted by Scuba_Vixen) I'm still used to thinking in OC terms, I promise I'll get better. I understand what you're saying about FO2 and FiO2. ..... I'm just used to thinking in terms of net O2 percentage inspired, which would be FiO2. The leakage I was worried about was at the P port where the sensor assembly goes into the bag. So far, all the conversions I've seen are KISS type manual addition. ... Has anyone done anything with control electronics and a solenoid valve? .... Or is the Dolphin just not a suitable platform to get that advanced with? Oopppps, there I go with more questions again already, Darlene Your talking apples and oranges now, unless your a wiss kid at electronics you would be better off buying a off-the-self E-CCR. Buying and assembling parts for a Dolphin E-CRR could get expensive, especially when you screw something up or if your trying to figure out what you need by trial and error. Since you live in the US buying a second hand E-CCR should cost you around $4500.
(Offline)

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