Page 1 of 1

No input for independent Twin-Set cylinders

Posted: Mon Jul 13, 2020 4:32 am
by Seb87
Hello,

I cannot see a way to input the following configuration in the environment tab to work out RMW.
Diving with 2 independent cylinders (swapping regs under water regularly to balance the draw):
Cylinder 1: 12l, 200bar in, 90bar out
Cylinder 2: 12l, 220bar in, 100bar out

The Sidemount and Double options assume that both cylinders have the same pressure (basically manifolded) to start the dive, which does not fit the scenario above as they're independent and with different start pressure.

Thanks for your help.

Seb

Re: No input for independent Twin-Set cylinders

Posted: Mon Jul 13, 2020 9:39 am
by support
Hello Seb,

First I just want to mention that DiveLogDT (and Dive Log) can get multiple tank information from your dive computer if it supports it. If you have multiple tanks configured in your dive computer and it's not showing up in DiveLogDT, please contact us. Also, if your dive computer understands the notion of a tank (or gas) switch and you're not seeing them in your dive profile, again contact us.

But if your dive computer doesn't know about it, you can add the information afterwards. On the Environment tab, you'll see the basic information for your "Main Tank" which for explanation purposes is your "Cylinder 1". Edit the dive and click the '+' next to it and add your 2nd tank "Tank 1" which will be your "Cylinder 2". Once you fill in the basic info like Start and Stop pressure and tank size, then the "over all" RMV number for the dive will show up in the bottom right. This is calculated using the total gas used over the two tanks and the whole dive.

Right now though, DiveLogDT has no knowledge about when you used the Main Tank and when you used Tank 1. Normally the dive computer would provide this information but not always. If you want to, and if you have the information, you can manually add your Tank switches to the profile. Edit the dive and go to the Profile tab. Place the red line at the point in the dive where you started using Tank 1 and right click -> select "Insert Tank Switch". Choose "Tank 1" and click OK. Continue in this manner back and forth between the 2 tanks until you're done. Now that we know when you were using which tank during the dive, when you go back to the Environment Tab, you should see a "Per Tank" RMV number next to the individual tank when selected.

You can also get a "periodic" RMV (or SAC) if you go to the Profile tab, click and hold in the "bottom" axis, and then drag to the right. You can see your Stats for just that selected portion of the dive.

Yes, selecting "Double" on a tank just means that you have 2 of those exact same sized tanks ganged together and are breathing from them both at the same time, so it just doubles the volume of gas available.

And yes, "Sidemount" is just a description of how you carried your tank for reference.

Let us know if you have any questions or any issues,
Janice

Re: No input for independent Twin-Set cylinders

Posted: Fri Jul 24, 2020 12:49 am
by Seb87
Hi Janice,

Thanks for the extensive response, your customer support is fantastic.

Unfortunately, my computer (Suunto Vyper Novo) does not know when I switch cylinder (I do not use the wireless tank pressure transmitters), so I would have to add manually the switches on the dive profile when donwloaded as suggested.

What I can do on the computer is to create bookmarks on my dive computer during the dive when I switch cylinder, so I assume when the profile is imported I would be able to see those and I could add the gas switches this way?

I will give it a go next time I go diving.

Thanks again for your support.

Seb

Re: No input for independent Twin-Set cylinders

Posted: Fri Jul 24, 2020 11:13 am
by support
What I can do on the computer is to create bookmarks on my dive computer during the dive when I switch cylinder, so I assume when the profile is imported I would be able to see those and I could add the gas switches this way?
We process *some* bookmarks from Suunto and show them in the profile. I'm not sure if we know one way or the other whether we recognize them from the Vyper Novo - we may not have known data to check this. If you have some dives already on the dive computer that you know you set a Bookmark, you could try looking for it in DiveLogDT and if it doesn't show up, we'll get a "dump" of your dive computer and see if we can find them. Going forward, certainly set a Bookmark on a dive and again, if it doesn't show up, we'll have you send us a dive computer dump at that time.

Janice

Re: No input for independent Twin-Set cylinders

Posted: Tue Oct 06, 2020 9:59 am
by johnstonskj
Hi, first I love DiveLogDT and have been using it for a while now. I just moved into sidemount and so far I am also using manual switching with no air senders so keeping track of the two tanks as you suggested by adding one. It does become hard to track though even once you figure this out, for example;

1. It would be nice to be able to rename the tanks rather than Main Tank and Tank 1, perhaps Left Primary, Right Primary for example which is how I tend to think of them.
2. There's no indication when I look at the Environment tab that two cylinders were used, I always have to see if there's more than one in the drop-down.
3. #2 is also true for the dive Summary tab, and the printed version.

I still love using it, but feel like this is an area that could be made a little more usable, thanks!

Re: No input for independent Twin-Set cylinders

Posted: Tue Oct 06, 2020 10:35 am
by support
Hello johnstonskj,

All of this is very true. :D :roll: :oops:

First for your #1 point - I can see why being able to assign a text name to the tanks would be helpful. Unfortunately this would require saving this name into the Database and therefore would require a database format update. Because we share this format with 3rd parties and others who synchronize with us, Database updates need to be planned, co-ordinated, and infrequent. I've added your idea though to our list of possibilites for our next Database update, but it could be awhile.

For #2 and #3, yes some indication should be there certainly. I'll think about how this can be best done, but if you have any suggestions, feel free to drop us an email. I can add this for the next release. Sidemount diving has certainly gained in popularity recently so it's not just tech divers with multiple tanks now.

Thanks for taking the time to give us feedback - we appreciate it.
Cheers,
Janice