Christopher Ward C60 Trident Elite 1000, Руководство пользователя

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How to operate your C60 Trident Elite 1000 Limited Edition
A helium release valve, or helium escape valve, provides functionality
for professional divers operating at great depths for prolonged
periods of time or under saturation.
When commercial divers operate at great depths, they often spend
prolonged hours in diving bells under pressure breathing a gas mix
like trimix or similar, that contains the gas helium. Since helium
molecules are the second smallest found in nature, the gas is able
to work its way inside the watch, around any O-rings or other seals
the watch may feature.
This is not a problem as long as the divers stay under pressure,
but when the decompression stops during resurfacing aren’t long
enough, a pressure difference builds up between the trapped
helium inside the watch and the outside environment.
The automatic helium release valve located on the side of the Elite
1000’s case is activated when the differential between the inner
and the outside pressure reaches a critical level. This means that
during an ascent, any helium trapped inside is automatically
released, with its one-way system ensuring any water is not allowed
to ingress.
The helium release valve