Bedienungsanleitung Omega 1538 (Seite 18 von 24) (Englisch)

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English

Quartz watches

Precision tolerances3

The precision of a mechanical movement depends on the individual

habits of the wearer and can therefore vary. A qualified OMEGA

watchmaker can adjust the precision of a watch to within the OMEGA

tolerances, which are from -1 to +6 seconds per day.

Other OMEGA mechanical watches

Watches without chronometer certification (COSC) have average

precision tolerances of between -1 and +11 seconds per day.

The precision of a mechanical movement depends on the individual

habits of the wearer and can therefore vary. A qualified OMEGA

watchmaker can adjust the precision of a watch to within the OMEGA

tolerances.

Quartz watches

All OMEGA quartz movements are produced in accordance with

OMEGA’s highly renowned procedures and quality standards. Ambient

temperature may affect the precision of quartz movements, which can

lead to variations of between -0.5 and +0.7 seconds per day.

Quartz watches with thermocompensation

(calibre 1680)

This movement is fitted with an electronic module that compensates

for the effects of temperature on the movement’s precision. These

watches are accurate to within +/- 0.055 seconds per day.

The precision of a mechanical watch cannot be compared to that of a

quartz watch, given that the two are based on different technologies.

Helium escape valve

Speciﬁ c sections/general information4

Your OMEGA Seamaster Professional Diver is the watch for pro-

fessional and amateur divers, as well as demanding sportsmen and

–women. A robust design, the new helium escape valve (exclusive

OMEGA patent), together with all the protection systems, offer opti-

mal security and reliability. In order to ensure that your watch remains

watertight, we recommend that you have it checked by an authorised

OMEGA partner every year.

Helium escape valve (fig. 1)

Why a helium escape valve? Air

cannot be used for deep-sea dives,

since oxygen (a constituent element

of air) becomes toxic at a depth of

60 metres. Therefore, when carrying

out work at great depths, profes-

sional divers stay in a diving bell for

several days, breathing a mixture

of gases containing a high proportion of helium. The pressure is

gradually increased to reach the pressure at the working depth. The

divers, still inside the bell, are then lowered to the working site. They

leave the bell to carry out their work.

Once their work is complete, they re-enter the bell, which is then

raised to the surface. Pressure is then returned to atmospheric levels

and this is when the valve must be opened (only for deep-sea dives

lasting several days).

The helium molecules diffuse and penetrate the material of the gas-

kets. The quantity is sufficient to push out the crystal during the return

to atmospheric pressure. To avoid this, the Seamaster Professional

Diver is equipped with a valve specially developed by OMEGA.

1020

2040

PROFESSIONAL

CHRONOMETER

300m/1000ft

fig. 1

OMEGA_V12-I.indb Abs1:36-Abs1:37OMEGA_V12-I.indb Abs1:36-Abs1:37 28/12/09 18:30:3828/12/09 18:30:38

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