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Closed Circuit Rebreathers: Discuss O2 cells in the Rebreathers - General Information forums: I have just connected up 2 brand new cells purchased a few months ago from RebreatherSpares. Upon fire up they ...

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Old 22-01-07, 08:11 PM
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O2 cells
I have just connected up 2 brand new cells purchased a few months ago from RebreatherSpares.

Upon fire up they read 0.16 & 0.14 respectively.

Has anyone else experienced this. If so, are these duff cells and will they recover when flushed with O2?

.......... Garry
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Old 22-01-07, 08:12 PM
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How long have they been out of the bag an what's the dates?
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Old 22-01-07, 08:21 PM
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Cell date ref D6. Purchased last June.

Took one out of the bag on Sat. Just checked and this one has recovered to 0.18.

Just taken the 2nd one out thinking that the first one was duff. This one is currently reading 0.14.
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Old 22-01-07, 08:32 PM
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That's not a good sign. I have had 2 fail from rebreatherspares.

Get in touch with Rod and see if he will swap them out, granted the ones I had were a couple of months old but they should last longer than that.

Try them in a pure O2 environment first though for half an hour, any longer than that and they should be working fine.
Last edited by Ivon : 22-01-07 at 08:42 PM.
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Old 22-01-07, 08:36 PM
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Thanks I'll give it a go.

......... Garry
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Old 22-01-07, 08:38 PM
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I put 3 new cells in my unit last week,dated F6 which i bought in Sept from Rebreather spares and they are working fine.
cheers
Mark
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Old 22-01-07, 09:25 PM
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I would not be too worryed at what they read in air at ambient till they have been calibrated up...or have they??

What are the milli volt readings on the cells? If they are between 8-13.5 MV they are within spec.


Try calibrating them up and then see what they read then at ambient in air. Should be around 0.20

ATB
Gareth
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Old 22-01-07, 09:45 PM
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Cell is reading 10.6mV so is in spec. Just not hitting 20%.

Hmmm.

Will calibrate as suggested.

Cheers

........... Garry
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Old 22-01-07, 09:50 PM
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Quote:
Originally Posted by Garry111
Cell is reading 10.6mV so is in spec. Just not hitting 20%.

Hmmm.

Will calibrate as suggested.

Cheers

........... Garry
I'm a bit confused, but if you swap a cell without calibrating, then I would be surprised if the reading did match. If the old cell read 13.5mV in air and the new one 7mV (the limits of the range) then you would expect the new one to read just half of the old one.

If this is post-calibration then yes, it's worrying as they are severely non-linear and I'd replace them.

Janos
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Old 22-01-07, 09:59 PM
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Just checked the other one and it only reached 9 mV.

hmmmm........
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