User manual

Poseidon MKVI User Manual
Chapter 3
Page 55
IMPORTANT:
When the mouthpiece is in the “cc” position, the PO
2
control
system maintains the loop PO
2
at whatever the current PO
2
setpoint
is, and decompression calculations are based on the current PO
2
value. When the mouthpiece is in the “oc” position, the PO
2
control
system maintains the loop PO
2
at whatever the PO
2
of the current
diluent is at the current depth, and decompression calculations
are based on the diver breathing the current diluent in open-circuit
mode. When the mouthpiece is in the “nc” or “uc” positions, the
PO
2
control system maintains the loop PO
2
at whatever the current
PO
2
setpoint is, and decompression calculations are based on the
diver breathing the current diluent in open-circuit mode.
Current depth
Figure 3-21. Current depth.
Maximum depth / Ceiling
Figure 3-22. Maximum depth ceiling.
In most circumstances,the maximum depth
achieved during the dive is displayed below the
current depth, in the lower-left corner of the
Primary Display, to the left of the word “Max”.
However, in the event that a diver has inadver-
tently incurred a decompression obligation, this
value changes to represent the current decom-
pression “ceiling” (shallowest depth to which it
is safe to ascend). When displaying the ceiling
value, the value briey changes to “cL” (to
indicate “ceiling”) every few seconds (as shown
below).
Figure 3-23. Display indicating ”ceiling” &
Total decompression.
Figure 3-24. Depth to which it is safe to
ascend & total decompression time.
Immediately beneath the PO
2
value, on the left
side of the screen, is the current depth reading.
This value is shown in either metric or imperial
units, depending on which mode is selected (as
indicated by the “FT” or “M” symbol to the right
of the current depth value). In metric mode, the
value is show to the nearest tenth (0.1) of a
meter; when in imperial mode, the value is shown
to the nearest foot. This value will ash whenever
the maximum rated depth (40 m) is exceeded.