JJ dil MAV

Tanel

Tanel

New Member
Anyone using JJ dil MAV?
For easyer flush or for outboard diluent?
Or for changing diluent?

Mine is not with dil MAV but considering to order new JJ and dil MAV too.
 
you don't really need a Dil MAV on the JJ as it's easy enough to roll your shoulder and fire the ADV if you're in reasonable trim
 
Yes, ADV is really easy to reach, no problem.
I need the way to change diluent and add offboard diluent.
Maybe the best way is via dil MAV?
Just like oxygen MAV - to use offboard oxygen
 
Tanel said:
Anyone using JJ dil MAV?
For easyer flush or for outboard diluent?
Or for changing diluent?

Mine is not with dil MAV but considering to order new JJ and dil MAV too.
Click to expand...

You don't need to order a new JJ to get the Dil MAV, you can order that as an uppgrade part. ;)
 
Tanel said:
Yes, ADV is really easy to reach, no problem.
I need the way to change diluent and add offboard diluent.
Maybe the best way is via dil MAV?
Just like oxygen MAV - to use offboard oxygen
Click to expand...

You can add off board diluent through the O2 MAV. Just disconnect the 02 lp hose and plug in the diluent. It will not fire the ADV this way though.I have LP hose on all my bail outs for this reason. Can run the unit SCR this way. I don´t see a need for a diluent MAV.
 
Robert Månsson said:
You don't need to order a new JJ to get the Dil MAV, you can order that as an uppgrade part. ;)
Click to expand...

Yes, but I need a new JJ anyway. This is decided. But this dil MAV?

I am thinking about if have dil MAV, can connect outboard diluent and even change diluent from high grade He to lower grade He. Then also change dil in controller.

The other question is if the diluent change in ascent (deeper than 80m dives) is adequate?
Like changing diluent from 80+m deep dives at the depth of ca 35-25m to lower He containing diluent and higher O2.
 
Igor said:
You can add off board diluent through the O2 MAV. Just disconnect the 02 lp hose and plug in the diluent. It will not fire the ADV this way though.I have LP hose on all my bail outs for this reason. Can run the unit SCR this way. I don´t see a need for a diluent MAV.
Click to expand...

Yes, sure. It is possible. But not sure controller will give me then real deco in SCR mode.
I generally think 65+m deep dives.

I too have all bailouts with LP hose. Really useful.
 
Tanel said:
Yes, but I need a new JJ anyway. This is decided. But this dil MAV?

I am thinking about if have dil MAV, can connect outboard diluent and even change diluent from high grade He to lower grade He. Then also change dil in controller.

The other question is if the diluent change in ascent (deeper than 80m dives) is adequate?
Like changing diluent from 80+m deep dives at the depth of ca 35-25m to lower He containing diluent and higher O2.
Click to expand...

Why would you change the diluent on a 80m dive? I would not. I would go for 12/60 or something around that and **** the switch. If you insist to change diluent you can still do it on the O2 MAV. Only reason to change dil would be hypoxia risk near surface. That is a risk, sure, but swapping diluents is also a risk factor. You can also **** that up, maybe not much of a risk depending on the gas but in any case it is a task. If you want the ADV to fire you need to connect the diluent to a gas block. The MAV will only manually add the gas just as the o2 MAV does if i am not mistaken.
 
Tanel said:
Yes, sure. It is possible. But not sure controller will give me then real deco in SCR mode.
I generally think 65+m deep dives.

I too have all bailouts with LP hose. Really useful.
Click to expand...

What would be the difference switching diluent through a diluent MAV or do it thorough the o2 MAV?. Same thing. My SCR suggestion would be for an emergency and even in an emergency i would opt for OC bail out 1st hand. The SCR mode would be as a last resort if i fecked up my gas planing or if for some reason my dil bottle is empty i could use my bail as diluent.
 
why would you wish to switch dil?
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What if it were a cave dive?

Having the ability to switch dil (or plug in off board) is crucial to some dive plans. If you think I want to use 85 meter gas I've needed on the way to a protracted 6 meter swim at max penetration whilst still a good three hours in you're having a laugh.

Remember, it's good to understand that not all diving is the same and people may do things differently from you because in their environment it is the best choice.
 
Clare said:
What if it were a cave dive?

Having the ability to switch dil (or plug in off board) is crucial to some dive plans. If you think I want to use 85 meter gas I've needed on the way to a protracted 6 meter swim at max penetration whilst still a good three hours in you're having a laugh.

Remember, it's good to understand that not all diving is the same and people may do things differently from you because in their environment it is the best choice.
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Good point. I was thinking about OW wreck diving with direct descent. For some cave diving scenarios there is a use. But if i would configure a JJ for this it would be with a gas block so the ADV works. If the man wants a diluent MAV just order it. It is not a big deal. I was just trying to point out that for wreck diving (that i assumed was the case) it is not essential in my opinion. And furthermore it has little advantage for cave diving as the O2 MAV does the same job. A gas/switch block would make sense for cave.
 
Once at it Clare.

Are you still happy with you configuration or have you and your partner changed any thing or thinking about it?

Thinking about doing some thing similary bot not exactly the same.

Tomas
 
Clare said:
*grins*. Which is why we have ours set up with one. I agree in the MAV but wanted to point out that "never" is a relative term ;)

Happy new year all.
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I have seen your config and i think it is interesting and you have some very good points. I have not got in to cave diving with my JJ yet.

We are playing around with different configurations involving 2x7 back mounted diluent/bail right now with long hose (much like RB 80). Coming from a GUE background it is a challenge to find a configuration that fits my demands. I have always been against gas switching blocks if it is not absolutely necessary though. No1 Killer in OC tech diving is gas switch that is why GUE has developed excellent standards for this. A gas switching block is a serious risk in my opinion. It is easier to do it wrong as you can´t utilize all the checks as you do on a GUE standard OC gas switch. But you are configuring for sump diving and in this case a gas switch block is a necessary evil. Rebreathers are more risky then OC i believe but one of the few points they really have over OC is that they eliminate gas switches.
 
I quite agree Igor.

Eliminating gas switches is a huge benefit of CCR (which I'm still not sure outweighs the risks on some dives). The way we have our unit set up requires fewer gas switches than our RB80 did (which could be more than OC on any individual dive).

I would not seek to switch gas unless required for dive safety. For the majority of the ocean dives we do, using CCR means that switching is just not necessary - even if the dive necessitated hypoxic dil we carry enough OC gas to switch OC for the last ascent and surface swim - al la RB80.

We still use GUE gas switch protocols in our team with whips to the block removed and restowed when not in use. I agree that it is far harder to confirm a switch on any form of gas block including that used on the RB80 - but we are aware of the pitfalls and do what we can to avoid them.

Only change we have made to the config referred to earlier is that when diving threes, we now dive them valves down as reaching them took too long and we struggled to get correct orientation valves when travelling. 7s remain valves up.

I've seen some shots of Richard's new set up which I like very much although I'm a little uncertain about having four cylinders for every dive. It is very clean though and well thought out. Would really like to see a breakdown and explanation on here (I saw it on Facebook)
 
Clare said:
I've seen some shots of Richard's new set up which I like very much although I'm a little uncertain about having four cylinders for every dive. It is very clean though and well thought out. Would really like to see a breakdown and explanation on here (I saw it on Facebook)
Click to expand...

+1

Not everyone is on Facebook. I'm not and I even have it blocked on my network to prevent anyone accessing it.
 
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