User manual

Poseidon MKVI User Manual
Chapter 3
Page 56
Remaining dive time (RDT)
The Remaining Dive Time (RDT) value, shown as the large number on the right side of the
Primary Display, is based on various factors, including the remaining no-decompression time
at the current depth, oxygen supply, remaining battery life, and oxygen toxicity units (OTUs).
The OTU’s will be logged and can be monitored through the PC tool. It represents the number
of minutes remaining at the current depth before one of these para meters is exceeded (“199”
is displayed if more than 199 minutes remain). When the value falls below 5 minutes, it will
ash. If a decompression ceiling is incurred, this value changes to represent the total decom-
pression time – ascent time plus decompression stop(s).
When displaying this value, the value briey
changes to “td” (“total decompression”) every
few seconds (as shown on the previous page).
Figure 3-25. Remaining dive time (RDT).
WARNING:
The Poseidon MKVI rebreather is in recreational mode not intended
for use on planned decompression dives. Although the Primary
Display will provide a limited amount of information to allow
completion of safe decompression, this information is provided
ONLY as a guide when limits have been exceeded.
WARNING:
Do not allow the Remaining Dive Time to reach zero! The value
will begin to ash when several minutes remain, when an ascent
should commence. Allowing the Remaining Dive Time to reach
zero could place the diver at signicant risk.
Elapsed dive time
Figure 3-26. Elapsed dive time.
The number of minutes that have elapsed
during the dive (i.e., the total dive time) is dis-
played in the lower-right corner of the Primary
Display, next to the small clock symbol printed
on the LCD glass. This value represents the
total elapsed time since the start of the dive. It
begins incrementing only when a dive has
started, and stops incrementing when the dive
ends. If a subsequent dive is conducted without
allowing the unit to power-down, then the
elapsed dive time resets.
Ascend/descend arrow
Located in the center of the Primary Display, between the Current Depth value and the Remaining
Dive Time value, is a symbol that can display an up-arrow, or a down-arrow. When the up-arrow
is displayed, the diver should immediately begin a safe, controlled ascent. The up-arrow does
not necessarily mean that the dive must be terminated – it may only indicate that the diver is
approaching the no-decompression limit at the current depth; in which case ascending a
certain amount may cause the up-arrow to stop ashing (i.e., when the depth is shallow
enough that the diver has ample remaining no-decompression time at the current depth).
Fig ur e 3 -2 7. Ascend arrow. Figure 3-28. Descend arrow
In the unlikely event that a diver incurs a decompression obligation (i.e., the Decompression
Ceiling Alert is displayed), and the diver then ascends above the depth at which the Decom-
pression Stop Alert is displayed, the down-arrow will ash. In this situation, simply descend
gradually until the down-arrow no longer ashes, and remain at that depth until the Decom-
pression Stop Alert no longer displays.