Shearwater Petrel 2/Perdix/Perdix AI/NERD 2/
Peregrine Firmware v84 Release Notes
VERSION 84
2021-07-21
Gas density display is now available.
It is only available in the configurable main screen
display. It shows gas density in g/L.
For Closed Circuit Diving:
The gas density display turns yellow at 5.2 g/L and
red at 6.3 g/L. No other warnings are generated.
For Open Circuit Diving:
The gas density display turns yellow at 6.3 g/L. No
other warnings are generated.
You may be surprised at how shallow these warning
colors appear. Read more about why we chose these
levels starting on page 66 here (recommendations
on page 73):
Anthony, T.G and Mitchell, S.J. Respiratory
physiology of rebreather diving. In: Pollock NW,
Sellers SH, Godfrey JM, eds. Rebreathers and
Scientific Diving. Proceedings of NPS/NOAA/DAN/
AAUS June 16-19, 2015 Workshop. Durham, NC; 2016.
The stack timer remaining time can now count
negative. Previously it counted down to zero and
then stopped there.
(all models)
(CCR modes
only)
NEW
NEW
2021-07-21
Rev A
Page 5
