damn cells

netmage · 4th August 2008, 19:25

The last few weeks I've been seeing some drift and swing w/ one of my cells. The variation has always been within '.1' and validated calibration back on the surface so it hasn't been a significant concern...

until....

yesterday while sitting on deco (1.2) I was hanging out about 5 minutes to go, and the cell drops to .4... I was at 20', so I do a dil flush and a O2 flush to see how it'll swing, hoping it'll pop back in - sure nuff, it was way outta whack...

I popped the unit back open this morning and checked airpoint, registered in normal range...., I havn't flushed w/ O2, but I'm thinking I'll be packing the cells up and heading over to FX to pop them in the cell checker. I have over 100 hours on these cells, it could just be time to bin it....

-Tim

Dsix36 · 4th August 2008, 21:21

Let us know how it turns out.

I have a cell that shows 11.5mv in air with the cell checker, but only 8-9mv installed in the head

Nailer99 · 5th August 2008, 02:44

I'm still pretty new, but.......isn't 100 hrs about the recomended usefull life for them? I thought it was something like: 1 year or 100 hours, whichever comes first?

Diverlee · 5th August 2008, 12:42

Quote: (Originally Posted by Dsix36)

Let us know how it turns out.

I have a cell that shows 11.5mv in air with the cell checker, but only 8-9mv installed in the head

I have a cell also that reads "funny" It's #1 on my secondary. It starts out on air reading 7-8 Mv, on 02 it reads 50 (the other 2 read much higher). It calabrates ok. I have changed the cell and the same thing. It reads always a little lower than #2 #3 during the dive but in range. When I start breathing on the loop the same cell will go up to 9 Mv (before the dive).
Mark sugested that I take it apart and clean the connections,(I believe this is what he said as I get directions wrong sometimes). I have not done this yet as my head is in the shop getting alterations.

deanc · 17th August 2008, 01:47

Quote: (Originally Posted by netmage)

I have over 100 hours on these cells, it could just be time to bin it....

-Tim

you should be so lucky 100 hours...

less than 3 hours, I have 3 brand new cells -- no kidding,
by end of 2nd dive, O2 flush at 6 m deco, 0.8, 1.2, 1.4
post-calibrate 10.8 11.1 12.9 52.6 52.6 60.4

1st dive almost the same, calibrate dry just fine.

cells no-like going under water!

4th August 2008, 19:25	#1 (permalink)
netmage Tim Owens Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Dec 2005 Location: Coconut Creek, FL Posts: 704	damn cells The last few weeks I've been seeing some drift and swing w/ one of my cells. The variation has always been within '.1' and validated calibration back on the surface so it hasn't been a significant concern... until.... yesterday while sitting on deco (1.2) I was hanging out about 5 minutes to go, and the cell drops to .4... I was at 20', so I do a dil flush and a O2 flush to see how it'll swing, hoping it'll pop back in - sure nuff, it was way outta whack... I popped the unit back open this morning and checked airpoint, registered in normal range...., I havn't flushed w/ O2, but I'm thinking I'll be packing the cells up and heading over to FX to pop them in the cell checker. I have over 100 hours on these cells, it could just be time to bin it.... -Tim
(Online)

4th August 2008, 21:21	#2 (permalink)
Dsix36 Going Down? Current Rebreather/s: Optima Other Rebreather/s: Join Date: Aug 2007 Location: Deerfield Beach, Florida Posts: 1,154	Re: damn cells Let us know how it turns out. I have a cell that shows 11.5mv in air with the cell checker, but only 8-9mv installed in the head __________________ THE MORE THAT I LEARN, THE MORE THAT I STILL NEED TO LEARN!!!!!!
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5th August 2008, 02:44	#3 (permalink)
Nailer99 RBW Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jan 2007 Location: Seattle, WA, USA Posts: 280	Re: damn cells I'm still pretty new, but.......isn't 100 hrs about the recomended usefull life for them? I thought it was something like: 1 year or 100 hours, whichever comes first?
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5th August 2008, 12:42	#4 (permalink)
Diverlee RBW Member Current Rebreather/s: Optima Other Rebreather/s: Join Date: Nov 2007 Location: Pompano Posts: 33	Re: damn cells Quote: (Originally Posted by Dsix36) Let us know how it turns out. I have a cell that shows 11.5mv in air with the cell checker, but only 8-9mv installed in the head I have a cell also that reads "funny" It's #1 on my secondary. It starts out on air reading 7-8 Mv, on 02 it reads 50 (the other 2 read much higher). It calabrates ok. I have changed the cell and the same thing. It reads always a little lower than #2 #3 during the dive but in range. When I start breathing on the loop the same cell will go up to 9 Mv (before the dive). Mark sugested that I take it apart and clean the connections,(I believe this is what he said as I get directions wrong sometimes). I have not done this yet as my head is in the shop getting alterations.
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17th August 2008, 01:47	#5 (permalink)
deanc New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Dec 2006 Location: Perth, WA Posts: 52	Re: damn cells Quote: (Originally Posted by netmage) I have over 100 hours on these cells, it could just be time to bin it.... -Tim you should be so lucky 100 hours... less than 3 hours, I have 3 brand new cells -- no kidding, by end of 2nd dive, O2 flush at 6 m deco, 0.8, 1.2, 1.4 post-calibrate 10.8 11.1 12.9 52.6 52.6 60.4 1st dive almost the same, calibrate dry just fine. cells no-like going under water! __________________ You dont know what you dont know.
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