Fwd: Re: O2 sensor values on CCR dives

[Willem Ferguson]

On 17/11/2017 20:10, Anton Lundin wrote:
> On 17 November, 2017 - Davide DB wrote:
>
>> Looking to one of my CCR dives (Petrel 2 controller) I realized that
>> Po2 values reported by Subsurface at the 6 meter stop are way higher
>> than those recorded and displayed by Shearwater Desktop.
>> I'm 100 sure that Shearwater Desktop shows correct values because I
>> perfectly remember O2 values I was seeing at 6 meter: I was never
>> never never over 1.6 for all the time.
>> According to Subsurface profile I was all the time at 6m over 1.6 with
>> spikes at 1.75.
>> Am I missing something?
>>
>> I chose a point in time (122' 50")and I attach three screenshots:
>>
>> Shearwater (which display only the AVG pO2)
>> Subsurface with single pO2 sensor display
>> Subsurface with AVG pO2 sensor display
> Could you dump the raw data from the device?
>
> It can be done using either dctool or using the predator protocol and
> creating a device dump.
>
>
> You could probably just send a log file of the download, I think I still
> got the tool to replay a log file as a download.
>
>
> Then I can take a look at the raw data to try to figure out what's going
> on.
>
>
> //Anton
>
>
If I remember correctly the Shearwater gives the millivolt reading of
the O2 sensor, not the PO2. The conversion from mV to PO2 is done
outside of the Shearwater.

Kind regards,

willem



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