POSEIDON SE7EN+ - Pre-Dive Procedures with a SE7 EN+ Enabled for Decompression Diving; 48 M;60 M Deco; Deep Trimix; Switching in between Batteries; Procedure

Poseidon SE7EN+ User Manual
Appendix 2
Page 91
4. Pre-Dive Procedures with a Poseidon SE7EN+
enabled for Decompression Diving
It is possible to determine whether a rig is congured for decompression diving by examining
the ceiling indicator during the pre-dive routine. The ceiling indicator will be blank for a standard
rig and be lit ash for a SE7EN+ enabled for decompression diving.
48m/60m/100m Trimix
Figure A2-7: Helium conrmation screens at test 51, showing the
alternating values of “HE” (for “Helium”; top), “Fr” (for “Fraction”;
middle), and a numeric value (indicating the assumed fraction of
Helium; bottom) for the diluent mixture.
Figure A2-8: Oxygen conrmation screens at test 52, showing the
alternating values of “o2” (for “Oxygen”; top), “Fr” (for “Fraction”;
middle), and a numeric value (indicating the assumed fraction of
Oxygen; bottom) for the diluent mixture.
5. Switching batteries
As soon as a battery is inserted into SE7EN the SE7EN settings will updated according to the
limitations given by the inserted battery. These changes take immediate effect and are stored
persistently.
When inserting a green battery SE7EN will set deco enable OFF, set FHe to 0%, set FO2 to
21%, set Max working depth to 40 m in the settings.
On a unit with the blue 48m, 60m or 100m Trimix battery installed, the diver will be prompted to conrm
the helium fraction (pre-dive test 51) and O2 fraction (test 52) of the diluent mixture. This test occurs
immediately after the mouthpiece ‘CC’ test (test 50), and will occur only if the SE7EN+ is congured for
decompression diving, or if the congured diluent is not air (the test is not performed if the rig is not
congured for decompression diving and the diluent is already congured as air).
The rig will display ‘HE’ ‘Fr’ ‘nn’ or ‘O
2
’ ‘Fr’ ‘nn’ in succession in the PO
2
eld, where ‘nn’ is the
assumed helium or oxygen fraction in the diluent. The diver will have to acknowledge this by going
through the standard wet/dry sequence (see chapter 2, Electronics Power-Up, in the SE7EN+
manual). If the helium or oxygen fraction is incorrect, the diver can either:
1. Use the Bluetooth link to change it to the correct value. The new value will appear in the LCD.
2. Let the test timeout (two minutes) at which point the rig will shut down.