Manual Version 19 / 01-2019 II Page 35 of 44
SF2 ECCR OPERATION MANUAL
8. Predive safety checks
The function tests and the processing of the checklists are essential for the smooth
functioning of the SF2. Even if the pure assembly is done beforehand, the entire
diving device must be checked at the dive site and the checklist must be gone
through. Important functional tests are the pressure tests for leaks in the system and
the control of the hose routing, shut-offs and connections. In addition, all valves
(solenoid, ADV, OPV, MAVs) must function properly and the controller must be
switched on. Even or especially if you already have a lot of experience with
rebreather devices, you should always work through the tests and checks with a
short checklist. Checklists and SOPs (standard operating procedures) are also
intended for professionals! Here you can learn a lot from aviation and emergency
medicine, where they due detailed incident and accident analyzes, checklists have
become indispensable.
8.1 Check gas flow / gas direction in the loop
The breathing tube must be checked before every dive as it is the connection
between the diver and the SF2. Check the breathing tube for cracks and damage
and check the O-rings on the connections. Take the opened mouthpiece in your
mouth and seal both openings of the loop one after the other with the palm of your
hand. When closing the inhalation side (right), a negative pressure must be created
when inhaling, and when exhaling and closing the exhalation side (left), an
overpressure must be created. If the breathing kit is tight, it can be screwed onto the
head of the SF2. It is not possible to mix up the connections due to the design, but
you should still get into the habit of picking up the breathing set correctly
immediately. The mouthpiece points to the SF2 with the slide (in closed position) or
the small hole for blowing out pointing downwards.
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