Poseidon SE7EN User Manual
Appendix 3 Page 123
Decompression enabled
Once a battery module that allows decompression is inserted into a SE7EN rebreather, the user
can then select whether the rig is
enabled
for decompression before any particular dive. If this
parameter is not set, then the battery behaves as though it is a non-decompression rig. This
feature allows the diver to decide whether the rebreather should function as a decompression-
enabled rebreather, or as a standard no-decompression rebreather, on any particular dive. This
parameter is altered through the configuration tool.
40m Deco Version
With the yellow Deco 40m battery module, the user may use the PC configuration or optionally
a M28 computer software tool to enable or disable decompression diving.
48m/60m/100m Deco Trimix Version
As with the yellow Deco 40m battery module, the blue Deco 48m, the white Deco 60m and
black 100m Trimix battery modules allow the user to enable or disable decompression using
the configuration software tool or the M28. In addition, these battery modules allow the user
to alter the diluent gas mixture.
Using either the 48 or 60m Trimix batteries the SE7EN will only accept “normoxic” diluent
mixtures (a minimum of 16% oxygen). Helium content is limited to 0-84% and N2 to 0-80%.
Maximum TTS
All technical battery modules include a unique feature: the ability for a diver to set a maximum
TTS value. This feature makes it easier to plan decompression dives, because this value deter-
mines when the system warns the diver that the limit has been reached. The generated alarm
response will be similar to the alarm shown when the diver exceeds the maximum working
depth of the rig. This value also affects the way the controlling resource algorithm (CRA) works,
as described below. This parameter is altered through the configuration tool or optionally
through the M28.
Decompression permitted
The SE7EN can be set up differently for different types of dives through the PC configuration
software tool. This tool can be downloaded from the Poseidon website,
www.poseidon.com
Alternatively the settings can be altered from the M28 computer through the system app and
further “Edit SE7EN reg”. This requires that the M28 is connected to the SE7EN system though
a cable connected to the E-Module.
The Blue, Yellow, White and Black batteries are configured by the factory to allow decompres-
sion diving. Once a battery module configured for decompression diving is inserted into a
SE7EN rebreather, a parameter in the rebreather is set to allow (optionally) decompression
diving. Only Poseidon can set this ‘Decompression permitted’ parameter. Without the proper
battery for decompression diving, none of the parameters described below can be altered.
3. Configuring the SE7EN for decompression diving
Moreover, the blue Deco 48m Trimix battery module allows dives to a maximum of 48 meters
and White Deco 60m Trimix to 60 meters. Using the 100m Deep battery the Poseidon SE7EN
will accept any diluent mixture with an oxygen fraction equal to or higher than 1%.
Decompression and TTS settings can be altered at any time until dive start meanwhile gas mixtures
only can be altered until test 50 has been reached. When decompression is enabled, the “ceiling”
indicator will be lit on the LCD screen.
