Cressi Leonardo Specifications download pdf (Page 43)

PO2 ALARM

(im. 17)

The computer is able to constantly monitor

another basic parameter relating to oxygen,

that is O2 partial pressure value (PO2). Oxy-

gen toxicity may be caused both by an exces-

sive exposure (CNS toxicity, seen in the

previous chapter) and by exceeding the maxi-

mum Po2, which is exceeding the maximum

depth allowed by the mixture used. As already

seen, the PO2 limit value is set by the diver in

a range between 1.2 bar and 1.6 bar. Leonardo

considers the 1.6 bar value as the partial pres-

sure maximum allowable limit and, according

to the used mixture, automatically signals the

maximum depth which may be reached. Re-

member that even by using air, you may reach

the oxygen toxicity limit. Such limit varies ac-

cording to the set PO2. Leonardo is manufac-

tured with a preset value of 1.4 bar, whose

corresponding maximum depth is 188 ft. in air.

It is possible to set the computer on other PO2

values, up to a maximum of 1.6 bar. To warn

the diver about the excess of Po2, when rea-

ching the limit depth relating to the set PO2

(1.2 bar to 1.6 bar), a sound alarm will start

while the Po2 icon will be flashing, indicating

the current depth. As soon as you return to a

depth shallower than the limit one, the sound

alarm stops, current depth and the Po2 icon

stop flashing. The latter icon remains lit up du-

ring the residual part of the dive, in the LOG

BOOK and in the PRE DIVE screen.

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Cressi Leonardo Specifications Page 43