Can I Correct Wrong Gas Selection?

[Martin Swanston]

I went diving last week using my Perdix AI and pod. The Perdix is set up to use 3 Gas Nx, and I managed to forget to leave the selected gas as 31%. This has meant, when importing into Subsurface, I have a three cylinders listed with the readings from the pod assigned to the second one. I removed cylinder 3, and also removed 31% from the O2% column.

I clearly can't delete the bottom cylinder, but is there any way to import the readings from T2 into T1? /Clearly it's not important, only affects my OCDness :)

Many thanks

Martin

[Michael Keller]

Hi Martin.

On 14/06/24 02:14, Martin Swanston wrote:

I went diving last week using my Perdix AI and pod. The Perdix is set up to use 3 Gas Nx, and I managed to forget to leave the selected gas as 31%. This has meant, when importing into Subsurface, I have a three cylinders listed with the readings from the pod assigned to the second one. I removed cylinder 3, and also removed 31% from the O2% column.

I clearly can't delete the bottom cylinder, but is there any way to import the readings from T2 into T1? /Clearly it's not important, only affects my OCDness :)

Yes, this is a known limitation of the current version of Subsurface - tank sensor information is mapped 1 : 1 to the enabled gas mixes. So if you are diving with 3 tanks with different gases, this will only give you a correct mapping if you use the first sensor in the list on the dive computer for the tank with the first gasmix in the list of gases (which will be the one with the highest O2 percentage), and the second sensor for the tank with the second gasmix, and so on.

If you are not carrying one of the gasmixes configured in your dive computer it is crucial that you disable this gasmix before you start the dive. This will mean that it is not listed in Subsurface after you download the dive log, meaning it will not cause an incorrect link between gasmix and sensor data. But more importantly, you need to do this as otherwise your dive computer will make incorrect assumptions about the remaining bottom time, which will potentially lead to decompression sickness or an out-of-gas situation. Also see the warning printed in your dive computer manual:

(https://cdn.shopify.com/s/files/1/0838/3732/1530/files/Perdix-2_RECREATIONAL_Manual_RevC.pdf?v=1710185719, page 49)

[Martin Swanston]

Hi Michael

Totally accept it was a mistake on my part and understand the implications of selecting the wrong gas. 

I’ll leave the dives as is, and be sure to select the correct gas next time!

Thanks 

Martin

On 14 Jun 2024, at 09:27, Michael Keller <mike...@042.ch> wrote:



<nSb57eWBbaiadzic.png>

(https://cdn.shopify.com/s/files/1/0838/3732/1530/files/Perdix-2_RECREATIONAL_Manual_RevC.pdf?v=1710185719, page 49)

--
You received this message because you are subscribed to the Google Groups "Subsurface Divelog" group.
To unsubscribe from this group and stop receiving emails from it, send an email to subsurface-dive...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/subsurface-divelog/a078f62c-44d8-4bd2-8d78-80481001ebbb%40042.ch.

[Michael Keller]

Hi Martin.

On 17/06/24 20:27, Martin Swanston wrote:

Totally accept it was a mistake on my part and understand the implications of selecting the wrong gas. 

I’ll leave the dives as is, and be sure to select the correct gas next time!

Yes, it is definitely imperative to select the correct gas for your dive. But to a similar extent it is imperative that you have only the gases enabled for your dive that you are actually carrying with you on the dive.

So when using a Shearwater dive computer in '3 gas nitrox' mode, unless you are carrying 3 tanks with 3 different gasmixes on your dive, one or two of the gasmixes must be disabled - only selecting the gasmix that you are using and leaving the other two enabled means that the dive computer thinks that you've got these gases with you and can switch to them whenever directed to by the dive computer.

As a consequence, you may go into decompression on your way up (because you can't switch to a higher percentage nitrox when the dive computer tells you to, or you may have to spend longer on your way to the surface than indicated by the dive computer because the dive computer assumed you'd be using higher percentage nitrox on your way up.

Cheers

  Michael Keller

[Gmail im Auftrag von Martin Gröger]

hm...

maybe there is a workaround to change the used gas.
you can open the locally saved *.ssrf-file in a simple texteditor, scroll to the dive you want to edit and change the gas and save the file. if you are a little familiar with xml-files it should be no prob.

--
You received this message because you are subscribed to the Google Groups "Subsurface Divelog" group.
To unsubscribe from this group and stop receiving emails from it, send an email to subsurface-dive...@googlegroups.com.

To view this discussion on the web visit https://groups.google.com/d/msgid/subsurface-divelog/8b5655e0-114e-4f20-9464-435f08847e9d%40042.ch.

[Martin Swanston]

Thanks Michael, I’ll give it a try!

On 17 Jun 2024, at 16:56, Gmail im Auftrag von Martin Gröger <megr...@gmail.com> wrote:



To view this discussion on the web visit https://groups.google.com/d/msgid/subsurface-divelog/CAAc4xUKiFDot-hnfMzu89C3mi1t5sXOPvmXSpy1e9YSEbkt9zA%40mail.gmail.com.

[Martin Swanston]

Hi Michael

I've been trying to find the local ssrf file but no luck (on a Mac). 

I did find the file 'divecomputer' for each dive under ~\Library\Application Support\Subsurface\cloudstorage\ and noted the line:

event 0:10 type=25 flags=3 name="gaschange" cylinder=1

For a previous dive using the correct gas, this was:

event 0:10 type=25 flags=1 name="gaschange" cylinder=0

I'm clearly missing something!

Thanks

Martin

[Gmail im Auftrag von Martin Gröger]

hi there
ok - save your data local, at a place you can find 😉. File->Save as->

then you can edit the *.ssrf.  then open the local file again in subsurface an got to: File->Save to the Cloud

keep on howling

grey

To view this discussion on the web visit https://groups.google.com/d/msgid/subsurface-divelog/0d7d0f5e-df81-4f11-be3b-40ae9c090d49n%40googlegroups.com.

[Martin Swanston]

I’m sorted. I saved the file locally, edited the ssrf file and now have a single cylinder and the SAC is also now available in the summary. 

I’ve uploaded this back to the cloud and all looks good!

Thanks for your help 

Regards 

Martin

On 19 Jun 2024, at 15:14, Martin Swanston <martin....@gmail.com> wrote:

Hi Michael

To view this discussion on the web visit https://groups.google.com/d/msgid/subsurface-divelog/0d7d0f5e-df81-4f11-be3b-40ae9c090d49n%40googlegroups.com.

[Martin Swanston]

Thanks Grey

Yes, I figured that out myself but thanks for confirming I did it right!

On 21 Jun 2024, at 12:19, Gmail im Auftrag von Martin Gröger <megr...@gmail.com> wrote:



To view this discussion on the web visit https://groups.google.com/d/msgid/subsurface-divelog/CAAc4xULZ%3DXsd6xOzugYf9Ph0cX_-Yv-YEB%3DTNc_gFk-%3DV7S6gQ%40mail.gmail.com.