rEvo - O2 at more than 100 m ?

[Superlyte27]

with no o2 supply a po2 of 1.2 will take around 13 minutes to drop to .7 - a dil flush that brings it back to 1.2 seems the simplest solution before adding extra bottles or manually adding and cacluating your off board gasses to bring it back up

That dil flush won’t last anywhere near as long as you think it does. We’ve tried it. It empties a 3liter bottle pretty quickly

 

[Dsix36]

If you have had a manual unit below 300' you already know that the amount of O2 addition is extremely small and very long between needed injections vs. normal shallow diving. With that said, I always found that having 50% plugged into the offboard plug of the MAV to do the trick. O2 makes it waaaaay to easy to overshoot the po2 when trying to just bump it a little.

 

[lermontov]

That dil flush won’t last anywhere near as long as you think it does. We’ve tried it. It empties a 3liter bottle pretty quickly

ok we have our deep BO as back up on LP hose- but if you have 1.2 at the bottom breathe it down to .7 diil flush back to 1.2 and breathe back to .7 thats 26 min - a long time at 100m

maybe if your up and down in a cave like your referencing then you might need a plan B

 

[cathal]

If you have had a manual unit below 300' you already know that the amount of O2 addition is extremely small and very long between needed injections vs. normal shallow diving. With that said, I always found that having 50% plugged into the offboard plug of the MAV to do the trick. O2 makes it waaaaay to easy to overshoot the po2 when trying to just bump it a little.

Just wondering was there any issues with narcosis and management of N2 for deco doing this, (as the computer effectively does not know you are injecting 50% N2 into the loop at depth), thanks.

 

[Superlyte27]

Just wondering was there any issues with narcosis and management of N2 for deco doing this, (as the computer effectively does not know you are injecting 50% N2 into the loop at depth), thanks.

This is one of the things that drives me nuts about buying a $14k rebreather. Rather than do all these mods on a rebreather right out of the box to get it to go deep, how about just buy a rebreather that goes deep?

I have 4 rebreathers that go to 500’ right out of the box, no issue. Right tool for the job kinda thing.

 

[cathal]

This is one of the things that drives me nuts about buying a $14k rebreather. Rather than do all these mods on a rebreather right out of the box to get it to go deep, how about just buy a rebreather that goes deep?

I have 4 rebreathers that go to 500’ right out of the box, no issue. Right tool for the job kinda thing.

The rEco can do that by simply changing it to ECCR. The question by the OP was how to go deep while the unit is in HCCR mode.

 

[Superlyte27]

The rEco can do that by simply changing it to ECCR. The question by the OP was how to go deep while the unit is in HCCR mode.

How are you changing it to ECCR. Unless something has changed since I had my 4 Revos the reg only puts out 145psi. Eccr or mccr, 145psi is 145psi regardless of whether an injector is feeding oxygen or the leaky valve is feeding oxygen.

 

[cathal]

How are you changing it to ECCR. Unless something has changed since I had my 4 Revos the reg only puts out 145psi. Eccr or mccr, 145psi is 145psi regardless of whether an injector is feeding oxygen or the leaky valve is feeding oxygen.

Plug the CMF and take the disk out of the 1st stage, thereby the 1st stage is now reacting to ambient pressure. The disc is the one with the writing on it in the attached picture.

 

[grantctobin]

How are you changing it to ECCR. Unless something has changed since I had my 4 Revos the reg only puts out 145psi. Eccr or mccr, 145psi is 145psi regardless of whether an injector is feeding oxygen or the leaky valve is feeding oxygen.

145psi above ambient if you remove the blanking plug. Same way your Optima regs function.

 

[Superlyte27]

Y

145psi above ambient if you remove the blanking plug. Same way your Optima regs function.

Yup, so basically negating all the “awesome” things that Paul tried to market the rEvo with. Lol.

Just buy a better rebreather.