AI cells in the Meg

Moray Brown · 18th March 2008, 08:51

Time to change the cells in the Meg... Am thinking of giving AI a try this time, before I pull the trigger on the order is there anyone using these WITH problems in the Meg? (last years bad batch already noted) All the best, Moray

Outlaw · 18th March 2008, 11:32

Quote: (Originally Posted by Moray Brown)

Time to change the cells in the Meg... Am thinking of giving AI a try this time, before I pull the trigger on the order is there anyone using these WITH problems in the Meg? (last years bad batch already noted) All the best, Moray

moray,

sorry i got no information for you but instead, because i just received my head from ISC after upgrade and change of sensors, could you expand on "last years bad batch " info?

which brand? any info from others on the subject will be seriously appreciated.

Thanks.

Spyros

Stephane · 18th March 2008, 11:47

Hello Spyros,

Moray talks about this: http://www.rebreatherworld.com/cells...or-recall.html

Outlaw · 18th March 2008, 13:57

Quote: (Originally Posted by Stephane)

Hello Spyros,

Moray talks about this: http://www.rebreatherworld.com/cells...or-recall.html

thanks a lot.

***Decodiver*** · 18th March 2008, 16:12

Personally I will soon be changing my AIs (on my rEvo) to Teledynes, I have just seen too many crap AIs out there.

Moray, my advice, put Teledynes in there.

Cheers,

Dave Cooper.

mempilot · 18th March 2008, 17:10

3 new AI's in my Meg in April 07.

2 bad AI's replaced in Jan 08.

1 of those went bad in Feb 08.

The AI's that failed in my unit showed slow acceptable decay in mV, but then just took a crap all of a sudden. One started very strong and died in 4 dives.

I'm thinking about switching to Tele's.

Philippe GERIN · 18th March 2008, 20:18

Quote: (Originally Posted by mempilot)

The AI's that failed in my unit showed slow acceptable decay in mV, but then just took a crap all of a sudden. One started very strong and died in 4 dives.

I used Teledyne cells only so far in my Kiss'ed Azimuth, my CK and my Meg. What you described also happened to me with Tele cells. Once in a while there's a bad batch. But it's true that lately AIs had a rather large bad batch. I'm using one AI on my Meg right now along with 2 Tele's precisely because one Tele became slow and limited to 37mV in O2 from one dive to the next (afternoon and next day morning) and my HH won't calibrate. I had 3 spare AI's in the box so I put what I had on hand. It's true that I can see that this AI is a bit slower than the 2 Tele's to react but so far it's not mV limited.
But that comes from a rather limited experience of a few hours only with AI cells.
Best
Philippe

mempilot · 18th March 2008, 20:43

I toss the cells when they are consistently slow during calibration. I also toss them when they won't go above 40 mV. This one cell listed above was reading just shy of 60 mV for 4 dives and then dropped to 38.x during the next calibration. I switched the cell around to make sure it wasn't a wire problem, and the cell read the same mV no matter which spot it was in.

Because of this cell behavior, I now calibrate at the beginning of every day (usually one to two dives in a day). I used to only calibrate once every few days of diving, but after seeing this cell go from strong to bad in one dive, I consider this an unneccessary risk. I'd rather not have to call too many dives or start peeling the head off the unit onboard a boat due to a bad cell noticed on the prebreathe sequence. I'd rather catch it in the calibration sequence. I know some are doing humid calibrations after a dive. I'm not sure I'd be comfortable with that either due to this reason. Granted, the cell will get voted out during a prebreath, but I'd rather know ahead of time.

mountain diver · 18th March 2008, 22:30

Quote: (Originally Posted by Moray Brown)

Time to change the cells in the Meg... Am thinking of giving AI a try this time, before I pull the trigger on the order is there anyone using these WITH problems in the Meg? (last years bad batch already noted) All the best, Moray

could also try this sensor,I hear are very good.

maxtec ~ premier o2 solutions :: max23

all the best.

Gilles · 18th March 2008, 22:41

Sadly, all cells are

. Hopefully they have been improving...Doesn't really matter what unit they are in.

Otherwise, as below...

Quote: (Originally Posted by Decodiver)

Personally I will soon be changing my AIs (on my rEvo) to Teledynes, I have just seen too many crap AIs out there.

Moray, my advice, put Teledynes in there.

Cheers,

Dave Cooper.

18th March 2008, 08:51	#1 (permalink)
Moray Brown Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Sep 2006 Location: WMUK Posts: 227	AI cells in the Meg Time to change the cells in the Meg... Am thinking of giving AI a try this time, before I pull the trigger on the order is there anyone using these WITH problems in the Meg? (last years bad batch already noted) All the best, Moray
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18th March 2008, 11:32	#2 (permalink)
Outlaw In search of Law breaking Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Aug 2006 Location: Cyprus, Nicosia Posts: 627	Re: AI cells in the Meg Quote: (Originally Posted by Moray Brown) Time to change the cells in the Meg... Am thinking of giving AI a try this time, before I pull the trigger on the order is there anyone using these WITH problems in the Meg? (last years bad batch already noted) All the best, Moray moray, sorry i got no information for you but instead, because i just received my head from ISC after upgrade and change of sensors, could you expand on "last years bad batch " info? which brand? any info from others on the subject will be seriously appreciated. Thanks. Spyros __________________ CMAS - IANTD - TDI Kamikazi Instrustor Trainer DIRRebreather Team Member ---------------------------- "Once an Outlaw, always an Outlaw"
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18th March 2008, 11:47	#3 (permalink)
Stephane Hey! Ho! Let's go! Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Nov 2005 Location: Nantes - France Posts: 725	Re: AI cells in the Meg Hello Spyros, Moray talks about this: http://www.rebreatherworld.com/cells...or-recall.html __________________ Stéphane Hammer-rEvo powered!
(Online)

18th March 2008, 13:57	#4 (permalink)
Outlaw In search of Law breaking Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Aug 2006 Location: Cyprus, Nicosia Posts: 627	Re: AI cells in the Meg Quote: (Originally Posted by Stephane) Hello Spyros, Moray talks about this: http://www.rebreatherworld.com/cells...or-recall.html thanks a lot. __________________ CMAS - IANTD - TDI Kamikazi Instrustor Trainer DIRRebreather Team Member ---------------------------- "Once an Outlaw, always an Outlaw"
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18th March 2008, 16:12	#5 (permalink)
*Decodiver* Administrator Current Rebreather/s: Megalodon Ouroboros rEvo Other CCR Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Sport Kiss Classic Kiss rEvo Other CCR Join Date: Jan 2005 Location: Geneva Posts: 2,168	Re: AI cells in the Meg Personally I will soon be changing my AIs (on my rEvo) to Teledynes, I have just seen too many crap AIs out there. Moray, my advice, put Teledynes in there. Cheers, Dave Cooper. __________________ CCR/OC Trimix Instructor Trainer CCR Training to Mixed Gas in Switzerland, France, UK & Germany on Megalodon/COPIS-Megalodon/KISS/Sport KISS/Ouroboros/rEvo/Inspiration/Evolution/Sentinel www.zerogravitydiving.com Rebreather World Terms & Conditions
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18th March 2008, 17:10	#6 (permalink)
mempilot What is this..terrafirma? Current Rebreather/s: Megalodon Other Rebreather/s: Megalodon Join Date: Aug 2006 Location: Ft. Lauderdale Posts: 1,184	Re: AI cells in the Meg 3 new AI's in my Meg in April 07. 2 bad AI's replaced in Jan 08. 1 of those went bad in Feb 08. The AI's that failed in my unit showed slow acceptable decay in mV, but then just took a crap all of a sudden. One started very strong and died in 4 dives. I'm thinking about switching to Tele's. __________________ MEM "Da Pilot" Black holes are where God divided by zero. "If at first you don't succeed, don't dive silent." "Would you mind not shooting at the thermo-nuclear weapons." ~ Vic Deakins "Donkey's kill more people annually than plane crashes."
(Online)

18th March 2008, 20:18	#7 (permalink)
Philippe GERIN ccr apprentice Current Rebreather/s: Megalodon Classic Kiss Other Rebreather/s: Join Date: May 2005 Location: Strasbourg, France Posts: 626	Re: AI cells in the Meg Quote: (Originally Posted by mempilot) The AI's that failed in my unit showed slow acceptable decay in mV, but then just took a crap all of a sudden. One started very strong and died in 4 dives. I used Teledyne cells only so far in my Kiss'ed Azimuth, my CK and my Meg. What you described also happened to me with Tele cells. Once in a while there's a bad batch. But it's true that lately AIs had a rather large bad batch. I'm using one AI on my Meg right now along with 2 Tele's precisely because one Tele became slow and limited to 37mV in O2 from one dive to the next (afternoon and next day morning) and my HH won't calibrate. I had 3 spare AI's in the box so I put what I had on hand. It's true that I can see that this AI is a bit slower than the 2 Tele's to react but so far it's not mV limited. But that comes from a rather limited experience of a few hours only with AI cells. Best Philippe
(Offline)

18th March 2008, 20:43	#8 (permalink)
mempilot What is this..terrafirma? Current Rebreather/s: Megalodon Other Rebreather/s: Megalodon Join Date: Aug 2006 Location: Ft. Lauderdale Posts: 1,184	Re: AI cells in the Meg I toss the cells when they are consistently slow during calibration. I also toss them when they won't go above 40 mV. This one cell listed above was reading just shy of 60 mV for 4 dives and then dropped to 38.x during the next calibration. I switched the cell around to make sure it wasn't a wire problem, and the cell read the same mV no matter which spot it was in. Because of this cell behavior, I now calibrate at the beginning of every day (usually one to two dives in a day). I used to only calibrate once every few days of diving, but after seeing this cell go from strong to bad in one dive, I consider this an unneccessary risk. I'd rather not have to call too many dives or start peeling the head off the unit onboard a boat due to a bad cell noticed on the prebreathe sequence. I'd rather catch it in the calibration sequence. I know some are doing humid calibrations after a dive. I'm not sure I'd be comfortable with that either due to this reason. Granted, the cell will get voted out during a prebreath, but I'd rather know ahead of time. __________________ MEM "Da Pilot" Black holes are where God divided by zero. "If at first you don't succeed, don't dive silent." "Would you mind not shooting at the thermo-nuclear weapons." ~ Vic Deakins "Donkey's kill more people annually than plane crashes."
(Online)

18th March 2008, 22:30	#9 (permalink)
mountain diver Silent Lucidity Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Mar 2006 Location: edmonton, ab. Posts: 175	Re: AI cells in the Meg Quote: (Originally Posted by Moray Brown) Time to change the cells in the Meg... Am thinking of giving AI a try this time, before I pull the trigger on the order is there anyone using these WITH problems in the Meg? (last years bad batch already noted) All the best, Moray could also try this sensor,I hear are very good. maxtec ~ premier o2 solutions :: max23 all the best.
(Online)

18th March 2008, 22:41	#10 (permalink)
Gilles Worship the feminine Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: Den Haag (Netherlands) Posts: 761	Re: AI cells in the Meg Sadly, all cells are. Hopefully they have been improving...Doesn't really matter what unit they are in. Otherwise, as below... Quote: (Originally Posted by Decodiver) Personally I will soon be changing my AIs (on my rEvo) to Teledynes, I have just seen too many crap AIs out there. Moray, my advice, put Teledynes in there. Cheers, Dave Cooper. __________________ Gilles http://www.dirrebreather.com
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