The issue is it must use something as a baseline to determine the ACTUAL gas volume in the cylinder, not just what is entered in tank size.
For example I can carry an aluminum 80 on 3 different dives with 3 different pressures. Let's assume that on each dive I breathe the cylinder empty.
Let's also assume that each dive the tank size is entered as an aluminum 80 in the uemis.
Each dive will be in 33ftsw while resting on a platform.
Dive 1 - 3000psi start 0psi finish - 90 minutes
Dive 2 - 2000psi start 0psi finish - 60 minutes
Dive 3 - 1000psi start 0psi finish - 30 minutes
If the uemis assumes each cylinder has 80cuft it will return 3 different sac rates, when in reality the sac was the same, just 3 different amounts of gas to be consumed.
I guess my point is that in order for the uemis to give an accurate sac rate in cuft per minute, it needs to know how many cubic feet was in the cylinder, and I do not see an entry for that, like I have in my other AI computers that compute my sac rate. I understand it has tank size, but that has little to do with the actual volume of gas present.
If for example I were to fill an aluminum 80 to 4000psi(obviously I would not do this, just trying to show an example), the actual cuft of gas in the cylinder would be 108cuft. So, should I enter 108 into tank size to get an accurate sac reading? If it only had 1500psi, should I enter 40 into tank size? If so, the manual should be amended to input actual gas volume not tank size. And this would require calculating actual volume based on the current fill before every dive, and then inputing it.
Marc
