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Preface
Congratulations on your decision to purchase the Poseidon SE7EN Closed-Circuit
Rebreather (CCR). The Poseidon SE7EN design includes several fundamental improve-
ments over previous closed-circuit rebreather designs. Among the breakthroughs are:
• Extreme compactness – at only 18 kg / 40 lbs ”ready to dive” and 9 kg / 20 lbs
“travel weight” the SE7EN is one of the world’s smallest rebreathers. Take it as
carry-on baggage when ying. Enjoy the freedom. Yet it is not “lightweight” in terms
of performance – you get three depth-independent hours1 of near-silent diving.
• The rst truly auto-calibrating and auto-validating rebreather. The SE7EN uses a
patented automated method to verify that the oxygen sensors are working
properly at all times – both before and during a dive.
• An intelligent battery – it’s your personal power and data storage system. Plug it
in and the system knows it’s you, as well as your dive history, including repetitive
dive information. Remove the modular battery, put it in your shirt pocket, and take
it home to recharge it. When you are ready to dive, take the battery from the
charger and plug it into the rebreather.
• True plug-and-play carbon dioxide absorbent cartridges. Simple and fast to use.
Pre-packed axial cartridges of SofnoDive
®
797 absorbent give you 3 hours
minimum diving range1 and can be changed-out and replaced in seconds.
• The world’s most advanced rebreather interface – The SE7EN contains ve
separate warning and advisory systems so that you get the information you need
to manage your dive without the task-loading normally associated with rebreath-
ers. The main Poseidon SE7EN data interface is a large format at screen panel
that displays all you need to know about consumables management – cylinder
pressures, dive time, depth, oxygen level, and it incorporates a sophisticated
resource algorithm that monitors all systems for you and tells you when its time to
head up. If things are not going correctly for whatever reason, the SE7EN has
audible, tactile, and visual warning systems to get your attention, and to advise
your diving partner of your status.
1 Unlike open-circuit scuba, the rate of gas consumption on the Poseidon SE7EN does not
depend on the depth of the dive. Instead, the oxygen supply depends on how fast the diver
consumes oxygen through metabolism. Divers with large muscle mass, and/or working
hard underwater, will consume oxygen faster, leading to shorter total dive times. Conversely,
smaller divers with less muscle mass, or relaxed divers who are not working hard, will gain
signicant improvements in dive duration.
• Switchable mouthpiece – in a signicant new patented design, the Poseidon
SE7EN gives you the ability to switch from closed-circuit to open-circuit opera-
tion in one easy motion, without the need to search for a spare mouthpiece in an
emergency. The ultra-compact switchable mouthpiece is lightweight and easy to
breathe, giving you high performance in both open-circuit and closed-circuit
modes. The SE7EN mouthpiece also combines in the same housing a pressure
balanced “Automatic Diluent Addition Valve” (ADV) that compensates for breathing
volume in closed-circuit mode, so that you will never run short of a full breath
during a dive.
• Easy maintenance – the entire rebreather breaks down rapidly for washing,
drying, and storage. No tools needed.
• New software releases can be downloaded and installed over the internet, and
various system parameters can be customized to meet your particular dive
ope rating paradigm.
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