Poseidon SE7EN User Manual
Appendix 3 Page 95
Two things are worth noting in Figure 2-5. First, the inner green circle indicating how much time
remains before the PST is complete, or how much time is left for the diver to complete some
required action. Second, the icon with the diagonal line through it in the upper-right corner of
the screen is the “Do Not Dive” symbol, which is displayed throughout the entire pre-dive
process. As long as this symbol is displayed, the dive should not be started.
If a test fails, the routine is halted at the failed test, an error code is shown to right of the circle
containing the test number. In the box below the circle a text message tells the reason for the
failed test and the user will be prompted to shut down the unit of not by pressing either of the
buttons for YES or NO. (see Figure 2-6). If the wet-switch is connected (i.e., wet), then the rig
will not power-down, and the system will inject excessive oxygen intermittently, in case a diver
is breathing on the loop.
DANGER:
Do not attempt to conduct a dive until the system has successfully
completed all of the pre-dive tests. Diving in spite of a failed
pre-dive test is extremely dangerous, and could lead to serious
injury or death.
Closed Circuit mouthpiece position (Test 23)
Test 23 (mouthpiece CC position test) is automatically passed provided the mouthpiece was
left in the CC position following the previous steps. If, for some reason, the mouthpiece is not
in the CC position when Test 23 appears on the screen, the audio alarm with two frequency
tones will activate and a message prompting the diver to switch the mouthpiece to the CC
position (Figure 2-6B). The system allows the diver up to two minutes to make this switch. The
“Closed-Circuit” icon will continue to display until Test 43, when the mouthpiece needs to be
switched to the open-circuit (OC) position.
If the mouthpiece appears to be in the closed-circuit position, but Test 23 does not pass, then
make sure that the mouthpiece switch is fully in the CC position. If the test still will not pass,
then make sure the HUD is positioned correctly on the mouthpiece, and is not twisted or oth-
erwise moved from its proper position. If no amount of repositioning of the mouthpiece lever or
HUD allows the system to pass Test 23, then contact an authorized Poseidon Service Center.
Figure 2-6B.
Pre-Dive Tests
Once the PST has completed the SE7EN enters Pre-Dive mode.
A very brief summary of these pre dive tests is as follows:
• Test 40: Decompression status verification
• Test 41: Scrubber installed confirmation
• Test 43: Mouthpiece OC test
• Tests 44-45: Sufficient oxygen and diluent to go diving test
• Test 48: Sufficient battery power to go diving test
• Test 49: Positive pressure loop test (PPLT)
• Test 50: Mouthpiece CC test
• Test 53: O2 calibration test
• Test 54: Open Circuit regulator test
• Test 55: Service interval test
When one of the PSTs fails, consult Appendix 1 to understand further what the failed test
means. In most cases, the first thing to try is to run the automatic pre-dive routine again by
following the the steps under electronics power up on page 92. If the same test fails again with
the same error code, power down the electronics, then eject and re-seat the battery (see
Chapter 1). If the automatic pre-dive routine persistently fails any of these tests, contact a
Poseidon Tech Center for assistance. In general, repeated failure of any one of these automated
tests indicates a problem with the Poseidon SE7EN that will not be serviceable by the user.
