rEvo - O2 at more than 100 m ?

[Raf BE]

Hi all,
Once bellow 100 m, to keep the cmf working (during ascent) I used to plug one BO on the MAV to keep PPO2.
I was just wondering if someone tried to connect the MAV with 100 % 02 from a BO or carrying an extra small tank ?

If someone did it how comfortable is it as I assume you should be very "light" when pushing the manual injection ;-)

Tx

Rgds

 

[-Sven-]

Hi,
no personal experience, but instructor gave me his advice for that situation:

Connect 100% O2 to MAV.
Open tank then close tank. Now the hose is filled with O2.
Press MAV button.

 

[cathal]

Or just change it to ECCR operation for sub 100M dives??

 

[Wibble]

Or just change it to ECCR operation for sub 100M dives??

The problem is that the solenoid doubles as the orifice. This is fed from the second LP take off on the fixed IP O2 reg. Beyond 120m(?) this regulator stops working even for manual O2 addition (from the first LP take off)

Hence you need a second O2 cylinder with a "normal" regulator, but that cannot be connected to the orifice/solenoid as the absolute pressure will be greater therefore the amount of O2 pumped through the orifice will be higher. Therefore it has to be connected to the offboard MAV.

 

[broncobowsher]

When going to eCCR on the rEvo you block the CMF (mine came with the plug to do so) and use a regular depth compensating regulator. Go into the Shearwater and change the setting from CMF to eCCR.

 

[beldridg]

Hi all,
Once bellow 100 m, to keep the cmf working (during ascent) I used to plug one BO on the MAV to keep PPO2.
I was just wondering if someone tried to connect the MAV with 100 % 02 from a BO or carrying an extra small tank ?

If someone did it how comfortable is it as I assume you should be very "light" when pushing the manual injection ;-)

Tx

Rgds

Yes, I use a second, dedicated small O2 cylinder connected to the off board port on the MAV.

I like that it give me a second, redundant "ready-to-go" source of O2 for deeper dives.

But, I also know people who either convert their units to ECCR or use a bailout cylinder with appropriate PO2 connected to the MAV.

- brett

 

[J-Vo]

Any reason you can't use a needle valve on the rEvo?

 

[beldridg]

Any reason you can't use a needle valve on the rEvo?

Theoretically, not at all. I've talked to a few different divers about it.

Which would you recommend?

- brett

 

[Tassi Devil Diver]

Convert to ECCR plug the CMF and remove the oxygen first stage cap turning it into a normal regulator.

 

[Brad_Horn]

Or if you want to retain the CMF function, upgrade to an Apollo A320 Oxy; factory set by Open Safety to 19bar IP