Position 0:
Helium valve closed.
THE POSITIONS OF THE HELIUM VALVE
Position 1:
Helium valve open.
In diving bells, in which professional divers
are accommodated over several days while
working at great depths, the pressure
corresponds to that of the diving depth. The
diver can therefore leave the bell without any
adjustment time. Once the work under water
is completed, the diving bell is raised to the
surface again with the divers inside it. As this
process takes place, the pressure level in the
bell is continuously adjusted to that of the
surroundings.
The helium outlet valve on divers’ watches is
used in such a situation. The diving bell is
filled with an oxygen-helium mixture under
USE OF THE HELIUM VALVE
Before starting a dive, set the zero marking
of the rotating bezel (F) to the position of the
minute hand (D). By doing this, you can see
how much diving time has elapsed while you
are diving.
USE OF THE ROTATING BEZEL
water. During the overpressure at depth, tiny
helium atoms from the ambient air can
penetrate the seals on the watch (diffusion). If
the pressure equalization is then not adjusted
inside the watch – in the same way as in the
diving bell – the watch glass could pop out. In
order to prevent this, the helium atoms that
have penetrated must be released again.
This is achieved by means of the special
outlet valve that Favre-Leuba has developed
for the Raider Harpoon. The valve is marked
“
He
” (A). When the valve is open (position
1
),
the watch is waterproof for normal use. For
any type of dive, however, the valve should
be closed (position
0
).
For safety reasons, the bezel can only be
rotated counterclockwise. If the rotating
bezel is turned accidentally during a dive,
this means that a longer diving time is always
shown. This reduces the risk of accident.
USER MANUAL
RAIDER HARPOON
USER MANUAL
7
RAIDER HARPOON
