sailor

Hi, there's something wrong with that sheet.
There's a lot of safety margin in Draeger's calculation.
Most SCR-divers i know use one jet-size smaller then required by the used gas.
According to the Draeger manual you'll never have below 20% O2 in the loop with 2,5 Ltr./min O2-usage.
Nobody can use 2,5 liter O2 per minute for more than a couple of minutes because this will cause real extreme exhaustion.
With your monitoring you are on the safe side anyway.
When you flush your loop before ascending you are on the safe side for sure.