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the battery capacity in four steps. With the low battery warning indicating 2 hours
battery time remaining the symbol starts to ash and a warning sound is repeated
every 20 seconds. The battery symbol and warning sound indicates battery status in
the BAC only, not the HUD.
During use, the remaining air time is calculated based on the previous air
consumption. Since the value is calculated, the displayed time can be both shorter
or longer than the actual remaining time, depending on the previous and future work
load and rate of breathing. The remaining time information must only be used as a
complement to the cylinder pressure information. Low air warnings must always be
heeded, regardless of the remaining time indication. Until the rst value is calculated
from the air consumption, the display shows “CALC...”. The rst value is displayed
when there has been a signicant pressure drop, normally after one to two minutes of
breathing.
The remaining time is shown as calculated time remaining in minutes until the “1/3”
pressure level is reached.
The absorbed temperature is measured inside the DDU and shown in Fahrenheit.
As an optional setting a temperature alarm can be activated. When the absorbed
temperature reaches the pre-set temperature level the alarm will start with warnings
beeps and the Display unit will read “TEMP !!!”. The “TEMP !!!” indication disappears
after 10 seconds or when the black button is pressed. The “TEMP !!!” indication and
the warnings beeps are repeated every 20 seconds.
3.3 UNDERSTANDING THE BAC
Sound
outlet
LED ramp
BAC unit, left side shown
The BAC is positioned between the cylinder and backplate with two identical sides
visible to the left and the right of the cylinder. Both sides have an LED ramp working
as location lights and indicators for PASS mode and low air warning. The red and
yellow ashing LEDs on both sides of the BAC are synchronized to ash with the
respective red and yellow LEDs on the Digital Display Unit (DDU). Sound outlets for
PASS pre-alert and PASS alarm are located on both sides.
With the low battery warning indicating 2 hours battery time remaining a warning
sound is emitted every 20 seconds.
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