Would it also make sense to change any weak/duff cells as necessary?
Must be the benefit of having 5 , you can leave all the knackered ones in there, bonus.
If a cell is not trusted it should be removed. The only cell worse than no cell is an unreliable cell.
People have died because they relied on cells that were not reliable (visualise CCR at 50m continuously injecting oxygen and extrapolate). Don't join them as it upsets a lot of people and creates a lot of paperwork.
Better to not dive due to lack of cells that to die because of unreliable cells. Nothing underwater is worth dying for!
Last edited by dwhitlow; 23-07-2020 at 11:15 PM.
When you say weak or duff what are your talking about . If you have a cell that's a bit slower than all the others but gets there would you call that a duff cell . And should that worry you when you have a total of 5 cell to run with .
Also can you turn off the selonoid on your unit and fly it of the nerd and the green button . Ps if you can only isolate the selonoid by closing your O2 then you have a problem with your independent back up nerd . Ie bottle neck at the O2 side of things
5 cell s are not going to help if the units reads low O2 and kicks in the selonoid pushing your po2 up . Or it jams open . Or a trickle feed problem.
Whats the preseved thinking / training for that on your unit . ( AP say feather the O2 valve but in practice it's shit and I personally do something different to solve that problem) yes you can plug in your deco bail out what ever that my be. Another bollox work around In real life .
Also what's the training on testing the selonoid pre dive and during dive . it's there as a back up failsafe so you need to known it's capable during your dive . Yes ?
Not criticising just interested to know how you isolate each potential problem test it or work round it
Had my old ap unit set up so I could turn the thing off isolate the O2 . And still fly it home. As long as I had good working cells, ( of course)
Last edited by gobfish1; 24-07-2020 at 10:56 AM.
None diver as of 2018.
Could that have been a rhetorical question clarifying @Doomanic's inference that ignored replacement of "weak/duff" cells?
But the craic is good.
Last edited by Wibs; 24-07-2020 at 07:34 AM.
Cells and replacements.
This document "Understanding oxygen sensors" explains the reasoning and data modelling behind 5 sensors and fully redundant electronics. The section "General recommendations for using sensors" is pertinent.