Hollis Explorer User Manual - page 54
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During pre-breathe, the unit needs to be breathed on to see a change in
the thermal profile. This does not guarantee correct operation, but has a
high likelihood of correct operation. Any sense of dizziness, nausea or oth-
er CO
2
symptoms should also be used to alert the diver that the filter is not
operating correctly. A small bypass due to a badly fitted filter or CO
2
seals
could give this scenario of a good peak, but an amount of CO
2
could still
bypass the filter. If this occurs, stop breathing on the EXPLORER. This will
be indicated (and alarmed for) by the Gaseous CO
2
sensor. Replace the
absorbent and/or check filter packing and seating.
CAUTION: Pre-breathing any rebreather should be done in
a safe seated position where the diver can monitor displays
and any potential symptoms of CO
2
poisoning. Pre-breathing
should never be conducted while walking or standing in a place
where the diver could fall into the water or injure him or herself.
The actual minutes remaining number displayed to the diver comes from
the Oxygen Injection Monitor. This gives a consistent and reliable reading
of current absorbent duration based on Oxygen injection.
Always remember to reset the absorbent duration when a new filter is
fitted. You will be prompted to do this during the Pre-dive sequence (Fig
3.21).
DANGER: DO NOT reset the absorbent duration unless a new
filter with fresh absorbent has been fitted.
Always change the absorbent when the low filter alarm appears, or before
if you suspect the absorbent is not operating correctly or close to the end
of its life - be conservative - be safe.
DANGER: If an absorbent filter is not fitted, the green central
indicator will not be visible on the Right Hand End Cap and it
will not be possible to breathe off of the loop.
No matter how many safety monitoring systems are in place, use
your own common sense and discipline to ensure you do not
push the life support systems beyond their designed limitations.
It is your life being supported - respect the equipment and its
limitations.
Fig. 3.21
!
!
CAUTION