Hollis Explorer User Manual - page 39
DCP (Dive Control Parameter)
DYNAMIC PO
2
The EXPLORER is a dynamic PO
2
controller. This means it can vary the
PO
2
that it maintains based on the value of certain resources. A higher
DCP (Dive Control Parameter) value means less decompression (higher
PO
2
) but more gas usage and a lower PO
2
is the opposite. For a set DCP
the actual PO
2
will vary throughout the dive profile.
The DCP can be set to AUTO or MANUAL mode.
MANUAL MODE
In manual mode the diver can set the DCP using the screen shown (Fig.
3.16). A long hold of either the + or - button will jump the DCP value by 10.
AUTO MODE
AUTO mode automatically adjusts the DCP throughout the dive to give the
best compromise between maximum NDL and minimum gas usage (Fig.
3.19). While shallow (less than 10 m), the DCP will remain at its current val-
ue. This defaults to 50% each time the unit is switched on. The first time the
dive exceeds 10 m depth, the DCP will automatically be set high to reduce
the NDL but then as the diver ascends and the NDL naturally increases,
then the DCP will start to automatically reduce to save gas while maintain-
ing a long NDL (>1 hr). At the start of the dive the DCP will automatically
set high to reduce the NDL but then as the diver ascends and the NDL
naturally increases, then the DCP will start to automatically reduce to save
gas while maintaining a long NDL (>1 hr)
NOTE: Auto Mode is the default. If on a dive where Manual
Mode has been selected and you then surface and complete
the dive, Auto Mode will be the default at the start of the next
dive.
HOW AUTO MODE WORKS
By setting ‘Auto’ DCP prior to diving the following events occur.
1. The DCP will automatically be set to 95% for the first 10 minutes of the
dive but only after the diver exceeds 10 m of depth.
Fig. 3.18
Fig. 3.19
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