O2 sensor values on CCR dives

[John Smith]

On 1 Dec 2017, at 20:39, Davide DB <dbdavide at gmail.com<mailto:dbdavide at gmail.com>> wrote:

Yes I know perfectly how calibration works. I meant how po2 is calculated from downloaded data.

Sorry, I wasn’t making myself clear. The point I was trying to make was wondering how libdivecomputer takes the individual cell calibration into account as there doesnt seem to be any calibration values in the log file.

It's a completely different story.

Am I the only one with a Petrel controller here? Maybe other user can confirm if their pO2 values are correct.

I was thinking about whether I could time match data from my AP handset - which shows PPO2 for each cell against my ext petrel  data. The following graph shows the data extracted from subsurface.


[cid:c2b9af0b-0980-493c-b296-7c51e8aff908]

I know there is a small difference between the two computers, I see that during calibration, but I cannot see anything major in this particular dive.


davide at mobile

Il 01 dic 2017 7:38 PM, "John Smith" <noseygit at hotmail.com<mailto:noseygit at hotmail.com>> ha scritto:

What I do not understand is how this conversion was made the very first time. I mean how did you reverse engineered those values? I mean did you have a reference data set (mV, calibration K and resulting po2) to compare against?
Surely every time you run the calibration routine on the shearwater there should be a new calibration value (calibration k) for each cell. The PPO2 is then a linear calculation based on this.



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