26
Functions during the dive
4.4.8
Partial pressure of oxygen (ppO
2
max) / Maximum Operating Depth (MOD)
The maximum partial pressure of oxygen ppO
2
max (default 1.4bar)
determines the Maximum Operating Depth (MOD). Diving deeper than the
MOD will expose the diver to oxygen partial pressures higher than the set
maximum level.
The ppO
2
max and consequently the MOD can be reduced manually
(->22, setting the gas mixture, point 5).
In addition the maximum allowed ppO
2
can be set by means of Dive.Log or
with "set 1" between 1.2 to 1.6bar ->69.
When MOD is exceeded, alarm goes on and MOD value will replace tank
pressure value.
WARNING
The MOD is a function of ppO
2
max and the mixture used. If during the dive the MOD is reached
or exceeded Subgear XP-3H sends an audible attention message and the MOD is displayed
(flashing) in the lower left corner.
Ascend to a depth shallower than the displayed MOD in order to diminish the danger of oxygen
poisoning.
WARNING
The MOD should not be exceeded. Disregarding the warning can lead to oxygen poisoning.
4.4.9
Oxygen toxicity (CNS O
2
%)
Subgear XP-3H calculates oxygen toxicity based on depth, time and the
gas mixture and displays it in the location of the ascent rate. The toxicity is
expressed in 1% increments of a maximum tolerated value (O
2
clock).
The symbol "CNS O
2
" is displayed together with the percentage.
WARNING
An audible attention signal goes off if oxygen toxicity reaches 75%.
The symbol “CNS O
2
” flashes. Ascend to shallower depth to decrease
oxygen loading and consider terminating the dive.
WARNING
When oxygen toxicity reaches 100%, an audible alarm goes off every
4 seconds. "CNS O
2
" and the percentage value flash. Danger of
oxygen toxicity!
Start procedure for terminating the dive.
• During an ascent and if the CNS O
2
% value does not increase
anymore (due to a lower partial pressure of oxygen), the
audible warning is suppressed.
• During the ascent, the display of the oxygen toxicity is replaced
by the ascent rate. If the ascent is stopped, the display
changes back to the indication of the CNS value.
Max Operating Depth MOD
Oxygen toxicity
4s
