Automatic Helium Escapement Valve; Tag Heuer Chronometer - TAG Heuer CALIBRE 16 Instruction Manual

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
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which is highly enriched with helium.
Helium is a very light and volatile gas, which may
infiltrate the chronograph on exposure to substan-
tial pressure in the caisson. When the diver rises
to the surface, all the gases expand as the pressure falls. The helium trapped in the chronograph 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 chronograph.
*According to model

TAG HEUER CHRONOMETER*

Only chronographs which are certified chronometers are accompanied by the certificate stating that the
movement has successfully passed all the tests of the Swiss Official Chronometer Control (C.O.S.C.)
and that its precision and reliability have been verified over a period of 15 days, in 5 positions and
at 3 temperatures.
The personalized number engraved on your watch and marked on your certificate corresponds to the
chronometer's movement number and guarantees that your chronograph is a chronometer certified
by the C.O.S.C.
*According to model