SUUNTO COBRA User Guide - Manual (Page 58)

The remaining air time calculation includes a 35 bar/500 psi safety reserve. This means
that when the instrument shows the air time to be zero, there is still about 35 bar/500
psi of pressure left in your cylinder, depending on your air consumption rate. With a
high consumption rate, the limit will be closer to 50 bar/700 psi and with a low rate
closer to 35 bar/500 psi.
NOTE
Filling your BC affects the air time calculation due to the temporary
increase in air consumption.
NOTE
A change of temperature will affect the cylinder pressure and
consequently the air time calculation.
Low Air Pressure Warnings
The dive computer will warn you with three (3) audible double beeps and a blinking
pressure display when the cylinder pressure reaches 50 bar/725 psi. The next three
double beeps are heard when the cylinder pressure reaches 35 bar /500 psi and when
the remaining air time reaches zero.
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