Seac Sub N-Synchro Instructions page 16

FIG. 3
FIG. 5
This means that the air flow delivery is perfectly
controlled by the diver's breathing action: a
normal breathing action produces a light air
flow, while heavy breathing due to fatigue
or deep diving produces a free air flow, also
increased by the Venturi effect.
In addition, this system also provides safety
margins in case of first stage overpressure:
should the intermediate pressure supplied by
the first stage suddenly increase, the second
stage would continue to work, thus releas-
ing excess pressure and enabling the diver to
breathe.
The control of the DIVE and PrE-DIVE mecha-
nism adjust the Venturi effect. The lever, regu-
lating the breathing effort reduction system,
control this system. By actuating this mecha-
nism placed to the left of the second stage you
can adjust the Venturi effect and consequently
increase air delivery.
By turning the lever towards the outside you
reach the "DIVE" position, and by turning the
14 14
FIG. 4
FIG. 6
lever towards the diver you reach the "PrE-
DIVE" position (Fig. 7).
The "PrE-DIVE" position is recommended to
prevent accidental delivery when the regula-
tor is under pressure but not in use, while the
"DIVE" position is recommended during the
dive.
Warning! move the lever to "PrE-DIVE" only
when the regulator is not used, and rotate it
to "DIVE" before starting diving.
A special label is included on the case to make
N-SYNChro and N-SYNChro oCTo second
stages quick and easy to identify.