[JonORunde]

I have the original VR3-kit from ISC on my COPIS-Meg, cable plugged into right lung, the little K1d cell.
The cell calibrates perfectly on air and O2 on the surface.
When diving, the VR3 show _really_ high ppO2 (like 2bar+)

Is this a design-flaw?

My thougt was that either
1. It is something wrong with the cell/vr3/something
or, more likely
2. The cell is located in the right lung. In the bottom of that lung, O2 is added, as this is a COPIS-meg. ON the top of the lung, the T-pieces are, and gas flows through when I breath.
As gas goes the path of least resistance, why should any mixed gas force itself down into the lung ?
If so, all I measure, is high ppO2-content that is at the bottom of the lung, sometimes flushed even more with pure O2.

Am I right or what?

jon o

[JonnyB]

Quote: (Originally Posted by JonORunde)

I have the original VR3-kit from ISC on my COPIS-Meg, cable plugged into right lung, the little K1d cell.
The cell calibrates perfectly on air and O2 on the surface.
When diving, the VR3 show _really_ high ppO2 (like 2bar+)

Is this a design-flaw?

My thougt was that either
1. It is something wrong with the cell/vr3/something
or, more likely
2. The cell is located in the right lung. In the bottom of that lung, O2 is added, as this is a COPIS-meg. ON the top of the lung, the T-pieces are, and gas flows through when I breath.
As gas goes the path of least resistance, why should any mixed gas force itself down into the lung ?
If so, all I measure, is high ppO2-content that is at the bottom of the lung, sometimes flushed even more with pure O2.

Am I right or what?

jon o

The design where you have and ADV port in your right lung will not work when you are diving the unit manually, either by having a COPIS or just diving manually. THis is due to the fact that you will be adding O2 straight on to the cell every time and it will be spiking.
As i see it there is only one sollution for you and that it to switch side with the ADV.
The only other sollution is to purchase another right lung witout the port and buy the adapter that goes ontop the head that allowes you to have a K1D next to the other cells.

/Jonny

[wedivebc]

Quote: (Originally Posted by JonnyB)

The only other sollution is to purchase another right lung witout the port and buy the adapter that goes ontop the head that allowes you to have a K1D next to the other cells.

/Jonny

How about putting the O2 addition into the left side mixed gas bypass.
No need to change ADV position

[JonORunde]

Both good ideas, I will try both, see what I am most comfortable with.

Both O2-addition and dil-flush is now muscle-memory, and must be relearned

Maybe If i have both O2 and dil on same side, that will be a problem, adding dil while adding O2 and such.
Will try anyways...

jon o

[wedivebc]

Quote: (Originally Posted by JonORunde)

Both good ideas, I will try both, see what I am most comfortable with.

Both O2-addition and dil-flush is now muscle-memory, and must be relearned

Maybe If i have both O2 and dil on same side, that will be a problem, adding dil while adding O2 and such.
Will try anyways...

jon o

I have never had to add O2 and dil at the same time. Why would you?

[JonORunde]

Quote: (Originally Posted by wedivebc)

I have never had to add O2 and dil at the same time. Why would you?

What I mean, is that if I add O2, and then press the lung a bit together, I might fire the ADV, thus cancelling out the O2-addition.
Don't know if it is a problem, will check it out


Jon O

[JonnyB]

Quote: (Originally Posted by wedivebc)

How about putting the O2 addition into the left side mixed gas bypass.
No need to change ADV position

Hi Dave, that is true, i have thought of that myself. And the only reason as i see that i would not do that is that i do not want to break the Right=Rich Left=Lean standard.
Some other people i have been speaking with say to me that they prefer this way so that they can scooter with right hand.

/Jonny

[Gilles]

Quote: (Originally Posted by JonORunde)

What I mean, is that if I add O2, and then press the lung a bit together, I might fire the ADV, thus cancelling out the O2-addition.
Don't know if it is a problem, will check it out


Jon O

This will not be a problem. Plugging in your O2 on the left gives you the following advantages;

1) Complete Rebreather operation with one hand. Right hand is free for reel/light/etc
2) Better cell response to manual addition
3) Better O2 flushing capability/efficiency

Quote: (Originally Posted by JonnyB)

Hi Dave, that is true, i have thought of that myself. And the only reason as i see that i would not do that is that i do not want to break the Right=Rich Left=Lean standard.
Some other people i have been speaking with say to me that they prefer this way so that they can scooter with right hand.

/Jonny

Following our discussion about this, I have made my O2 hose a yellow one to make it obvious what gas source it is.

[Outlaw]

Quote: (Originally Posted by JonORunde)

What I mean, is that if I add O2, and then press the lung a bit together, I might fire the ADV, thus cancelling out the O2-addition.
Don't know if it is a problem, will check it out


Jon O

hello Jon O,

i am one of the people who support the o2 hose to be on the left lung. also correct from Gilles regarding the points he gives out as positives from the left lung dil and o2 additions.

regarding your concerns about mistakenly pressing the lung and adding some dil in i suggest you use a shut off valve on the ADV. then there is no problem. try it and let me know.

hope it helps and it gives you peace of mind.

Thanks.

Spyros

[Outlaw]

Quote: (Originally Posted by Gilles)

Following our discussion about this, I have made my O2 hose a yellow one to make it obvious what gas source it is.

Gilles,

i have fought with these thoughts for a long time now, and i have come to the conclusion that in case of an emergency and another diver finds you unconscious, then if is a Rebreather diver, or better say an RB familiar diver, i guess he/she should know which is which or should recognize which is which quite fast. if is a non RB familiar diver, do you think he/she can save you in any other way, apart from sticking an oc reg into your mouth? personally i doubt it. off course the colour might increase chances, but i really think that if RB familiar, then one would know. also one would recognize what ADV valve is...

make a poll? statistically speaking, is there any Rebreather diver who is not in a position to recognize an ADV? how many think that an OC non RB familiar diver would recognize an ADV valve, and or which is which on a RB.

just my personal thoughts.

Thanks