O2 sensor values on CCR dives

[Davide DB]

No problem.

Today dive. Again a small offset between Shearwater desktop and Subsurface
pO2 values.

Am I the only one with a Petrel controller ccr?

Jan?



davide at mobile

Il 01 dic 2017 23:20, "John Smith" <noseygit at hotmail.com> ha scritto:

>
>
> On 1 Dec 2017, at 20:39, Davide DB <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.
>
>
>
> 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> 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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>> subsurface at subsurface-divelog.org
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>>
>>
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