Moisture Solutions?

sensor330

Today I tried putting a piece of shammy inside the Hammerhead on my YBOD because I'm having serious moisture problems on long dives in warm water, what a disaster. I got some very erratic reading on all cells had to abort the dive, came to the surface repositioned the shammy then only got erratic reading on one cell so aborted again. I then pulled shammy out and managed to get a dive in. Next time I time I'll try a sponge instead. Is there anyone out there who has a good way to manage the moist inside the head?

Scott

diverklondike

Scott,

What kind of problems have you been having due to the moisture that you are experiancing??

Not sure of what you consider long but I just got back from Ginnie and did several 2+ hour dives on a HH with no cell issues at all...

Dive Safe...

Mark

sensor330

3+ hours. Whats happening is the cells track good for a while but around the 1.5 hour mark I notice that only two out of the three cells are the same. When I do a dil flush I discover that only one of the cells is displaying the correct PO2. Although none of my cells have ever been voted out it still gets me a little concerned. This is and example of my readings 1.27 1.18 1.19. I'm pretty sure is moisture because if I dry them out between dive I'll be back to stable readings at the start of the next dive. My cells are only a couple months old but that really dosn't matter anyway as they could fail right out of the box.

Ginnie's a great Rebreather dive, I'll probably be diving there next weekend.

jradomski

Scott,
I have done may 3+ and 4+ hour dives without any cell issues at all, and some even longer than that..

I'd definately try a new set of sensors.. If you get moisture on the cells they should read a bit below actual but not significantly, this is not usually an issue unless you are really bumping up the po2..

also remember if a cell is not voted out all 3 cells are used to compute the average, so even if 2 cells are lower than the 3rd the average should not be significantly altered, it should be within your planning of +/- .05 atm for exposure and deco calcs..


If you were using a SP of 1.2 then your calcs should be made for 1.15 to 1.25 and even if the 1.27 was dead on its not a significant error from your limits, the integrated deco should have you in slightly better shape than actual and your CNS for a 3 hr dive is still within limits..

Even though it appears to work after its dried out, this doesnt mean anything.. cells are like a battery, and maintaing a high po2 stresses them, giving them time to dry out will also be at a much lower po2 which also gives them recovery time..

If you really want to prove it, dry the cells in a po2 enviroment near your target, that means in o2 under pressure..

__________________
Joe Radomski
CCR Trimix Instructor Trainer
ANDI Instructor Trainer Director #10

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