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Aeris A300 Manual

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A300/A300 XT OPERATING MANUAL
© 2002 Design, 2012 Doc. No. 12-7255-r01 (5/14/12)
SETTING NORM/TECH FO2 AND PO2 ALARMS
NORM is for use with only 1 Gas for which FO2 can be set for Air, and 21 to 100% Nitrox. The PO2 Alarm is fixed at 1.40
with a Warning fixed at 1.20.
TECH is for use with up to 3 Gas’ each of which FO2 can be set for Air, and 21 to 100% Nitrox. Each Gas has a separate PO2
Alarm which can be set from 1.00 to 1.60 with a Warning fixed at 0.20 less.
There is no FO2 50% Default setting like previous AERIS Nitrox dive computers.
Until a dive is conducted, FO2 for NORM and TECH remain at the values set for that mode (even if the mode is changed). When
the unit shuts off, the settings revert to Air (the default for all gasses).
After a dive is conducted, FO2 Gas 1 remains at the value set for the mode in which the dive was conducted (NORM or TECH),
and the setting automatically carries over to the other mode even if it had a different setting prior to the dive.
The PO2 alarm value for NORM remains fixed at 1.40 and the values for TECH remain as set, even if the mode is changed
between dives.
FO2 set for Air:
The default FO2 for all Gas’ each new period of activation is AIR.
When FO2 is set for AIR -
. . calculations are the same as when it is set for 21% O2.
. . it remains set for AIR until it is set for a numerical value (21 to 100%).
. . O2% and PO2 values and/or warnings will not be displayed at any time, on the surface or during dives.
. . max depths allowed by the PO2 limit set will not be displayed in Plan.
Internally, the unit will keep track of the oxygen loading so that if FO2 for Gas 1 is later set for a numerical value of FO2, the
oxygen accumulated during previous Air dives will be accounted for in the next Nitrox dive (during that series of repetitive dives).
FO2 set for Nitrox:
When FO2 for any Gas is set for a numerical value (21 to 100%), the dive is considered Nitrox with the NX icon displayed on
all applicable screens.
Once a dive is conducted with FO2 for Gas 1 is set for Nitrox, the Air option for any gas will be disabled until 24 hours elapse
after the last dive. The Air option will not be displayed in Set FO2 until a full 24 hour Surface Interval has elapsed.
NORM/TECH SET GAS LEAD-IN, information includes (Fig. 26):
> Graphics Go To GAS with SET icon.
• S (< 2 sec) to access Set Gas 1.
• A (< 2 sec) to step forward to Set ALM Lead-in.
• M (< 2 sec) to step back to Set OP MOD Lead-in.
• 2 minutes, or M (2 sec), revert to Main.
NORM/TECH SET GAS 1, information includes (Fig. 27, 28):
> SET, FO2, Gas (tank) 1 icons.
> CF, Z+ (or DSAT) icons, if they apply.
> Graphic AIR flashing, or -
. . Max Depth allowed with FT (or M) and MAX icons.
. . FO2 (numeric) value flashing.
Since there are only 2 digits, 100% is displayed as 00.
. . PO2 Alarm value with PO2 icon.
NORM is fixed at 1.40 (cannot be set), TECH can be set.
• A (hold) to scroll upward through FO2 settings from Air to 21 through 100% in 1% increments at 8/sec, stopping when the
button is released, or at 32, then at 50, then at 80 (even if A is held depressed).
• A (hold) again to resume the scroll upward through 100%, then stop at Air (or 21 if a repetitive Nitrox dive).
• A (< 2 sec) to step upward through the Set Points one at a time.
• M (< 2 sec) to step back through the Set Points one at a time.
• S (2 sec), if the setting is not changed, to step back to Set Gas Lead-in.
• 2 minutes, or M (2 sec), revert to Main.
• S (< 2 sec), if NORM, to save the setting and revert to Set Gas Lead-in.
• S (< 2 sec), if TECH, to save the setting and flash the PO2 digits if Nitrox, or access Set Gas 2 if Air.
To set PO2, if flashing -
• A (< 2 sec) to step upward through the Set Points of 1.00 to 1.60 one at a time in increments of 0.05.
• M (< 2 sec) to step back through the Set Points one at a time.
• S (< 2 sec) to save the PO2 Alarm setting and access Set Gas 2 (revert to Set Gas Lead-in after Gas 3).
• S (2 sec) to step back to Set Gas Lead-in.
Fig. 26 - SET GAS LEAD-IN
Fig. 27 - SET GAS 1
(for Air)
Fig. 28 - SET GAS 1
(for Nitrox)
… 14 …


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