Tank use and gas consumption display Was: CCR testing and other observations

Steve stevewilliams at internode.on.net
Thu May 25 03:13:09 PDT 2017

On 25 May 2017 at 02:21, Steve <stevewilliams at internode.on.net> wrote:
> I am diving a Kiss Sidewinder and Kiss Spirit LTE.
> The Petrel does not natively log cylinder pressures (although one of my backup computers the ix3m and ratio have just came out with pressure transmitters).
> I do record the pressures manually at the start and end of the dive and input those in the equipment section so subsurface should be able to read and display them.
> Steve

Hi Steve,
As Anton pointed out in this thread:
Subsurface shoulbe be able to display oxygen and diluent consumption simultaneously. At least for units like MkVI which logs cylinder's pressure natively.
Right now I'm record pressures manually: I add start/end pressures for default cylinder (diluent) and I add manually the oxygen cylinder recording start/end pressure. Unfortunately on "Info" tab gas consumption is not calculated (as raw liters) even for the default cylinder making the whole procedure for ccr pretty useless.
In my message I tried to describe IMHO a use case for units equipped with shearwater electronic:


What do you think?


I wonder what it would take for 'activate' subsurface to display the dil and o2 like it does for the MkVI, maybe it just needs some code to check the dive mode / dctype and existing pressures then do the output as the MkVI code?
I originally thought it was because of a bug that the gas was set to the wrong type as dil and o2 were not in the 'Use' list anymore.

I thought your use case description looked very good and normal for most ccr divers using most electronics.
The one exception is that almost all of the ccr divers I talk with express o2 consumption as litres per minute as that way the oxygen tank size does not matter like it does expressed as your bar per hour example.


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