Så kom den endelig.

[hannover_dk]

Her er forklaringen for IWC 3536 (sidst var det Ocean 2000). Der kræves nok at der ikke er revner/dybe ridser i glasset. Undskyld teksten står så dumt vh John

Citat:Why does the Aquatimer have no helium
valve, which the other two candidates possess?
The purpose of these valves is to allow helium,
which penetrates into a watch
during a deep dive, to escape
from its case afterwards. (During
the dive, the diver inside the
diving bell breathes an artificial
oxygen-helium atmosphere.)
Helium molecules are so small
that they can penetrate even
the tightest seal on a wellsealed
case. After helium has
entered the interior, and after
the diver returns to the surface, this gas must
be allowed to escape in order to equalize the
pressure differential between the interior of the
watch and the exterior environment. On the
Breitling and Panerai models, pressurized helium
escapes through a special valve: when the
interior pressure reaches a range of about 2.2
to 2.5 bar, this valve becomes active and opens
towards the outside. The Aquatimer was able
to do without this safety device because it’s
constructed so that its crystal can withstand an
inner pressure of up to 10 bar. A helium valve
also creates certain disadvantages. IWC’s technicians
explain: “We don’t need an additional
valve because although helium diffuses into the
watch, it also diffuses out of the watch again.
This watch can easily cope with the pressure
that’s created inside the watch during the
emergence (or “decompression”) phase,
which typically lasts several days on dives to
such extreme depths.”

alt fra en test her: http://www.clubbreitlingisrael.co.il/ima...anerai.pdf