Use Of The Regulator And Risk Assessment; Checks Before Use - Cressi MC9 Manuel D'instructions

3.1 – Use of the regulator and risk assessment
The regulator should be used only by divers who have attended
and completed successfully a special technical training course,
obtaining an underwater licence.
Nonetheless, before any use all environmental conditions should
be assessed, as well as the diver' s psychophysical state: if just
one aspect is risky, diving must be avoided.
Among possibly risky environmental conditions, are the sea
state, the presence of currents, particularly low water tempera-
ture, reduced visibility.
Among psycho-physical conditions, please consider imperfect
health, emotional or physical stress, ack of training, tiredness,
bad digestion.
Do not forget that after a long time without diving, you are parti-
cularly at risk, since you might have lost part or all of the skills
learnt at the training course.
Cressi-sub regulators' top quality materials and anti-corrosion
treatments allow their use in full safety.
Please remember that the open circuit air regulators are desi-
gned and tested for use up to a depth of 50 m/164 ft, in accor-
dance with EN 250:2000 standard, but recreational diving
should not be deeper than 40 m/131 ft., without any type of
underwater work.
3.2 – Checks before use
Before using your Cressi-sub regulator, we recommend to carry
out some easy though very important and unavoidable checks,
in order to avoid any kind of problem.
Check, for example, if the hoses are perfectly connected with
the first stage: in case they can be manually disconnected, you
should screw them down with a key, before loading the regula-
tor. Moreover, check the hoses do not look worn in any way and
are not cut or damaged at all.
In the same way, check the first and second stages for any
damage: check, for example, the second stage' s mouthpiece
for cuts or scratches and connect it perfectly with the first stage
by means of a lock band.
Before opening the tank' s valve, check the underwater pressu-
re gauge reports zero pressure.
The tanks' pressure must be checked by means of the special
underwater gauge or of a computer with such function: after
opening the tank' s valve, the gauge must show the tank' s cor-
rect working pressure.
WARNING: the regulator must be checked out of the
water, by depressing the manual supply button repeatedly, in
order to check the regular air supply; then, wear your mouth-
piece and make some deep inhalations and exhalations, in
order to check its perfect working (not for use in cold water <
10°C/< 50°F).
The same must be done on the water surface, before plun-
ging, wearing your mouthpiece and turning you head so that
the regulator is completely under water: inhale and exhale
deeply, in order to check its perfect working, in both phases
of air supply and discharge.
This test must be done also with the reserve regulator, be it
an independent regulator or an octopus (two second stages
connected with an only first stage).
Should you have also an "octopus" (two second stages con-
nected with an only first stage) you must test the reserve
second stage as well.
A last acoustic test might discover and/or point out possible los-
ses from connections and hoses or a free air flow from the
second stage: these are all anomalous situations requiring
immediate servicing or replacement of damaged components.
Should these anomalies be revealed, DO NOT dive and get to
anauthorized Cressi-sub centre to ask for all necessary servicing,
before using your equipment again.
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