9
AUTOMATIC HELIUM ESCAPEMENT VALVE*
The automatic helium escapement valve meets
the needs of hyperbaric divers who spend several
days in diving caissons and breathe a gas mixture
which is highly enriched with helium.
Helium is a very light and volatile gas, which may
infiltrate the watch on exposure to substantial
pressure in the caisson. When the diver rises to
the surface, all the gases expand as the pressure falls. The helium trapped in the watch is unable to
escape as quickly as it entered. Overpressure builds up inside the case and the valve will function
automatically, allowing the helium to escape and preventing damage to the watch.
*According to model
TAG HEUER CHRONOMETER*
Only chronometer-certified chronographs are accompanied by a certificate of proof that the movement
has passed all the tests carried out by C.O.S.C. (the Official Swiss Chronometer Testing Institute),
and that its accuracy and reliability were tested for 15 days, in five positions and at three different
temperatures.
The personalized number figuring on your certificate corresponds to the movement number of your
chronometer. This unique number guarantees that your watch is a C.O.S.C certified chronometer.
*According to model
Summary of Contents for Aquaracer 500 M
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