Poseidon SE7EN+ User Manual Chapter 1 Page 2
Open circuit/closed circuit mouthpiece
One of the most amazing of several technology breakthroughs in the Poseidon SE7EN+ is its
switch-able mouthpiece. It incorporates a high-performance lightweight open-circuit regulator,
and you can breathe it just that way, just like standard scuba. With a simple quarter-turn of an
easy-to-operate switch, the system is ready for fully closed-circuit, bubble-free, silent, depth-
independent diving.
Automatic diluent addition valve (ADV)
The mouthpiece also contains a patented system that integrates an automatic diluent addition
valve (ADV), which compensates for depth-related compression of the counterlung breathing
volume during descents. This ensures a full breath automatically, allowing for hands-free
descents. The Poseidon SE7EN+ incorporates this into the mouthpiece with a special mecha-
nism that adjusts the trigger tension on the open-circuit second stage when diving in closed-
circuit mode, so that gas is only added when the counterlung volume is insufcient to provide
a full breath on inhalation.
Heads-up display (HUD)
The mouthpiece also includes a snap-in-place head-up display (HUD). The HUD contains its
own computer processor that communicates with other system processors via the network,
and includes both a high-intensity red LED to alert the diver of a potential problem (Figure 1-3),
and a patented Juergensen Marine vibration system that provides a tactile alarm system to
advise the diver to switch from closed-circuit to open-circuit mode, or vice versa. The HUD
also contains a sophisticated sensor to detect which position the mouthpiece is in (closed-
circuit or open-circuit).
Figure 1-3.
HUD with red LED on.
Mouthpiece switch in closed circuit position
HUD
Figure 1-2. Mouthpiece open- & closed circuit switch and Heads-up display (HUD)
Purge button
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