Hollis Explorer User Manual - page 54
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Using these principles, the system measures the amount of gas injected
by the solenoid valve and converts it to a percentage of minutes remaining
at CE CO
2
rates. Although the displayed minutes are at CE CO
2
generation
standards, the minutes will tick down more slowly if the diver is breathing
at a reduced rate. This will be the most common scenario. However, in the
unusual condition of CO
2
generation at an elevated rate compared to 1.6 l/
min then the minutes will tick off more quickly. If the diver knows a particu-
larly strenuous dive is ahead, they should allow extra conservatism in the
minutes remaining counter for that dive.
! WARNING: The CO
2
Absorbent Scrubber Alarm consists of a Filter
reading of 0 minutes, blue/green HUD warning, and an ascent warn-
ing. It will activate while there is still sufficient duration to allow
a controlled ascent to the surface. At such time, the diver should
immediately end the dive and safely ascend to the surface on the
breathing loop.
! WARNING: If the CO
2
Absorbent Scrubber Alarm is triggered during
a dive, the scrubber time may increase during the ascent. This
does not mean that the scrubber is now safe to reuse. Discard the
scrubber material, and refill with new scrubber material before
additional dives.
!
DANGER: If in doubt of the condition of the CO
2
scrubber, replace
the absorbent and perform full pre-dive checks. Filter (scrubber)
time remaining must exceed the planned dive time.
OPERATION AND INTERACTION OF TEMPERATURE PROFILER
AND NITROX INJECTION METER
The thermistor bar chart of the temperature profile through the scrubber is
shown to give the diver information on the activity of absorbent inside the
scrubber. This should have a peak when the scrubber is being breathed
on. From cold it will take about 5 minutes for the CO
2
reaction to cause
a visible spike. This spike should then continue and grow higher. The
temperature bars fill from the left to the right as the scrubber is being used.
This screen is in the Pre-dive sequence.