Do all rebreathers require a bailout bottle on board ?

[Wibble]

And using the rEvo system of cell rotation every 6 months you use no more or no less cells for a unit that uses 3 cells, pretty smart ay

That’s right. Replace one of the five cells every 6 months.

The rules are quite simple:

1. If a cell is failing, replace it
2. If the youngest cell is over 6 months old, replace the oldest cell

How do you replace yours?

 

[rjack321]

And using the rEvo system of cell rotation every 6 months you use no more or no less cells for a unit that uses 3 cells, pretty smart ay

If you wanna trust a 2.5 year old cell knock yourself out...

 

[Tassi Devil Diver]

Have followed the rEvo procedure as taught in my MOD1 course and outlined here for 10 years with no issues, I have had in total 3 cells in that time not make it to 2.5 years. Why throw out a perfectly good cell after 12 or 18 months when they can be used very reliably on a truly redundant PO2 monitor. I check my cells regularly for current limiting in the field and in cell checker every 6 months. I personally think this system works very well.

 

[Wibble]

Have followed the rEvo procedure as taught in my MOD1 course and outlined here for 10 years with no issues, I have had in total 3 cells in that time not make it to 2.5 years. Why throw out a perfectly good cell after 12 or 18 months when they can be used very reliably on a truly redundant PO2 monitor. I check my cells regularly for current limiting in the field and in cell checker every 6 months. I personally think this system works very well.

It's great to have all 5 cells displaying so you can compare them and make informed decisions.

Even enables handling two concurrent cell failures; something which would throw a three-cell system into a tailspin -- probably out voting the one good cell.

Bottom line: Revo divers are very happy with replacing fewer cells and using consuming half the lime as other rebreather divers.

 

[L13]

If you wanna trust a 2.5 year old cell knock yourself out...

You do realize that, on a Revo, in that case you still have 3 cells under 1.5 years and 1 cell under 2 years in addition to that 2.5 year old cell. The younger cells would be even younger if you had ANY failures in the last 2.5 years.

 

[rjack321]

You do realize that, on a Revo, in that case you still have 3 cells under 1.5 years and 1 cell under 2 years in addition to that 2.5 year old cell. The younger cells would be even younger if you had ANY failures in the last 2.5 years.

So? Why do you have these 2+ yo cells tagging along at all? Its like wearing 5 watches, how many do you actually need to reliably tell time?

 

[formernuke]

So? Why do you have these 2+ yo cells tagging along at all? Its like wearing 5 watches, how many do you actually need to reliably tell time?

My life doesn't depend on what time it is, can't say the same for my PPO2

 

[rjack321]

My life doesn't depend on what time it is, can't say the same for my PPO2

clearly you are not doing deep trimix dives

 

[L13]

So? Why do you have these 2+ yo cells tagging along at all? Its like wearing 5 watches, how many do you actually need to reliably tell time?

In case of infant mortality on the youngest sensors. Why have 3 sensors(the norm)? Is that like wearing 3 watches?

I am not a CCR diver. However, I am an engineer with significant experience with electronics failures. Given that perspective, the Revo argument for "5 sensors good" makes more sense than the argument " >3 sensor bad". The argument " >3 sensors not worth it", has some merit too, but in conjunction with the Revo replacement procedure I think it probably is worth it. Though there are a lot of other reasons to pick a different CCR that might dominate.

 

[berndo]

Why throw out a perfectly good cell after 12 or 18 months when they can be used very reliably on a truly redundant PO2 monitor.

Why would all the other manufacturers tell you to chuck cells after 12 to 18 month if they are still very relibable?