XCCR with Petrel3 HP sensors missing data

[Attilla de Groot]

Hi,

Today I downloaded all my dives (since the Shearwater upgrade) with the latest qt-6 nightly, including the libdivecomputer log (see attached). I’ve added all of them to give logs with different tanks, gas mixes and usage.

Sunday I had a dive with a “close call” (feel free to ask details off-list) where I actually had to do a bailout on two gasses. So the log from 03/12 should give a “nice” view of a CCR dive. Unfortunately Shearwaters own application makes it very hard to read the details that, especially now, I would like to look into.

Hopefully this data helps a bit more.


— Attilla

> On 17 Mar 2023, at 09:21, Attilla de Groot via subsurface <subsurface at subsurface-divelog.org> wrote:
> 
> Hi,
> 
> Last December Shearwater fixed an issue on the Petrel3 that put a lot of gas changes in the dive log. This prevented from Subsurface / libdivecomputer to even download the log from the Petrel. After I was able to download the logs, I noticed that the HP sensors were not included as they were in the Shearwater application. Jef has been so kind to commit a change that solves this in libdivecomputer (https://github.com/libdivecomputer/libdivecomputer/commit/78373d827be59ade15446c74ad660580fb04de73). All pressure data is now included the libdivecomputer log (two HP sensors and the transmitters in my case) as you can see in the attached output.
> 
> I loaded it into subsurface, corrected the tank sizes and gas content. Unfortunately it seems there are a few issues when looking at it in Subsurface itself (and the data in the ssrf). The patch was also included in the latest Subsurface nightly and I tried to import the dives directly, but I’m seeing the same issues with these dives (and newer ones).
> 
> - On some (dives 2,3 and 5) of the dives the O2 sensor appears to be missing (or at least one of the HP sensors). See screenshots.
> - On the dives it seems that only the start and end pressure data is available for one of the HP sensors. E.g in dive5 I only see one sample/entry with the pressure of tank2 and no entry for tank3. I guess this is the cause for the “missing" sensor.
> 
>> <dive number='5' otu='70' cns='26%' date='2023-01-29' time='09:33:07' duration='48:42 min'>
>> <cylinder size='11.094 l' workpressure='206.843 bar' description='AL80' depth='22.294 m' />
>> <cylinder size='11.094 l' workpressure='206.843 bar' description='AL80' o2='50.0%' end='178.85 bar' depth='67.339 m' />
>> <cylinder size='3.0 l' workpressure='232.0 bar' description='3ℓ 232 bar' o2='19.0%' he='27.0%' start='181.056 bar' end='108.937 bar' depth='75.515 m' />
>> <cylinder size='3.0 l' workpressure='232.0 bar' description='3ℓ 232 bar' o2='100.0%' start='150.03 bar' end='104.938 bar' depth='67.706 m' />
>> ...
>> 
>> <sample time='52:30 min' depth='0.0 m' pressure2='108.937 bar' />
> 
> - The gas usage in the graph is not plotted correctly, while the start and end pressures are correct (see screenshot). I guess this is the result of the above.
> 
> 
> 
> Is this me doing something wrong or Subsurface not being able to handle pressure data for multiple tanks at the same time? In the past I’ve done dives with 4 transmitters and this seems to be available in the log and plotted correctly (when the tanks are assigned to the right sensor). I would expect to see something similar when I would import a dive from my Petrel3.
> 
> 
> 
> — Attilla
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