Compression Keys - Jaeger-leCoultre Master Compressor Diving Pro Geographic Manual

The "1000 Hours Control" test
by Jaeger-LeCoultre
Jaeger-LeCoultre subjects all its watches to the rigourous
"1000 Hours Control" test programme. Unique in its kind,
this programme consists of 1000 hours of comprehensive,
stringent checks.
The "1000 Hours Control" seal or marking affixed or engraved
on the back of your watch certifies that it has undergone this
observation programme in our laboratories and has passed all
the tests: rate regularity checks, temperature and atmospheric
pressure tests, resistance to impacts and magnetic fields and
water resistance tests. Your watch is therefore capable of
withstanding the trials awaiting it in everyday life when you
wear it on your wrist.

Compression keys

The compression key fitted on the crowns of Master
Compressor line watch models is a patented system which
enables additional compression of one of the 4 crown gaskets,
which boosts your watch's water resistance in the long term.
The "open" or "closed" position of the compression key is
indicated by the arrow symbols (viewed from the front):
- The compression key is in the compressed gasket position
("closed") if the indicator shows only one arrow; the keys
must be closed when you are wearing your watch and
when you are taking part in sports. You must not make any
adjustments or set the time in this position, since this might
damage the gaskets.
- The compression key is in the non-compressed gasket
position ("open") if the indicator shows two arrows; in this
configuration, you can then start the watch and set the
functions as per the explanations below.
Compressed gasket position or
"closed" position
The switch from the "closed" to the "open" position, or vice-
versa, is made by turning the key using the wing-nuts in the
direction indicated by the arrow(s).
Note
The water resistance function of the compression key is
separate from the operation of the crown itself. Even in
the closed position, the key does not lock the crown. So in
practice it is possible to handle the crown when the key is
in the compressed gasket position. However, as mentioned
earlier, it is extremely inadvisable to make adjustments
in this position, since this might damage the gaskets. We
recommend that you first turn the compression key to the
"open" position before making any adjustments to your watch.
M C D p g
aster oMpressor iving ro eographiC
Wing-nuts
Non-compressed gasket position
or "open" position
- English
Master Compressor Diving,
diver's watches satisfying the
NIHS 92 -11 (ISO 6425) standards
Master Compressor Diving line watches, which bear the
title "diving watches", satisfy the requirements of the Swiss
Watchmaking Industry Standard (NIHS) 92-11, reproducing
the European standard ISO 6425.
Recommended precautions
By way of precaution, please observe the following two
recommendations:
- do not adjust the crowns in water,
- do not use Master Compressor Diving watches for deep
dives (diving with a gas mixture, in which the diver spends
alternating periods between the water and a pressurised
chamber), or at a depth greater than that indicated.
The mechanical depth gauge
on the Master Compressor
Diving Pro Geographic watch
The Master Compressor Diving Pro Geographic watch
is equipped with a mechanical depth gauge, inside a
compartment located on the outer flank of the case. This is a
mechanical depth sensor which indicates the depth on a scale
of 0 to 80 metres, thanks to a membrane which contracts in
response to water pressure.
Please read the advice below carefully before first using the
depth gauge.
Calibrating the mechanical depth gauge
As a mechanical system, the depth gauge on the Master
Compressor Diving Pro Geographic
incorporate parameters specific to diving (atmospheric
pressure, altitude, temperature, salinity), as is the case of
professional diving computers.
During the casing process at the Sentier workshops, the
watch depth gauge zero level is calibrated for saline water at
20°C and at sea level.
The accuracy of the depth gauge therefore depends on the
environmental conditions of this initial calibration, which may vary.
Note
The mechanical depth gauge on the Master Compressor Diving
Pro Geographic watch is not part of the requirements or controls
stipulated by standards applicable to diving watches. Accordingly,
the NIHS 92-11 and ISO 6425 diving watch standards cannot
under any circumstances be quoted to certify the performance
of the depth gauge.
watch cannot
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