Do you check your cells

divetheworld

Following on from the lively, and interesting threads on cells over the years such as;
http://www.rebreatherworld.com/cells...tml#post106179

How many of you, and be very honest here, check your cells for mV output in air and O2?

I'm not talking about linearity checks in water, but mV tests.

This could be interesting but maybe misleading when you consider some CCR controllers have a mV readout. If you check mV because your controller has that option then let us know.

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bletso

I check mine in a pressure pot to make sure they have a full range reading every couple of months. When they can't get over 1.6 they are scrap. The nice thing about a pot is you have a real scenario to work from.

Dale

Steve

I check and log their mV readings in air and O2 pre dive (once a day. Damn I love the Meg for this feature) and check them at 6m with 100% O2 at the start of every dive.

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Beanie

somewhere between the first two, I check them when they go in.

The inspo gives a reading of them in air during cal (supposedly) the VR3 gives the read out when calibrating.

I do tend to check that my cal is right more often ie most dives.

I do check my unit more throughly when I've not used it for a while.

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DrJM

Every dive going down @ -6m on pure O2, dil closed, never bothering looking at the mv (option on Boris IIry display)


A friend of mind last weekend becoming complecent, didn't checked the cells on O2 at 6m, and guess what ? 400m into the cave at -71m one of the cell died, excuded from voting logic of his hammerhead, showing 1.1 when the 2 others were at 1.4. all the way back even at -6m deco on O2 the faulty cell was misreading at 1.1 ... it was an old cell (2-3 y old)


But what would had happen if it have been two faulty cells showing 1.1 and one correct at 1.4 with a SP of 1.4

Jerome

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nigelh

No.

Stuffing a voltmeter in them doesn't tell me anything that I don't see on the Vision handset calibrating it up.

Now if I had a pressure pot that I could flood with 100%, calibrate and then wind up the pressure to see where the plot kinked I'd be tempted to pull the head apart before big trips but otherwise no.

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nigelh

Mdemon

Classic gives an indication, so No. Use the meter only to test connections if cell reading funny.

I think the 1.6@6m test is much more useful. And easier.

dave t

No, checking Mv in air or o2 at surface pressure doesn't tell you anything, a cell with a supposedly healthy output of 10mv can still be current limited to 1.2bar or such. The guys who check their cells in pressure pots is the way to do it. Failing that checking that they go above your choosen setpoint on every dive is next best thing.

my opinion

Dave

divetheworld

Keep 'em coming, this is all good!!!

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Dutchy

Is that right? Is current limiting manifested through a cap-off or a non-linearity? If it is the first one then you are right. If it is the latter one then it might produce a 1.4 bar when your setpoint is 1.3 bar when actually the real ppO2 might be 3.0 bar ????? Does anyone have references or first hand knoledge?

(Until then i'll check it does 1.55-ish @ 6m while decending on pure oxygen...)

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