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AMPHOS DC MANUAL
© 2002 Design, 2012 Doc. No. 12-5301-r01 (12/17/12)
NORM/GAUG SET MODES
Sequence >> SURF Main > Set F (FO2) > Set A (Alarms) > Set U (Utilities) > SN (Serial Number).
> Access and step through of the sequence is gained by simultaneous 2 second presses of A and S.
> Alarms and Utilities can also be set/changed using the PC Interface program. FO2 must be set using the push buttons.
> Settings remain at the values saved until they are changed.
SETTING FO2 FOR NITROX DIVES
For each value of FO2, the MOD (Max Operating Depth) that can be achieved for the PO2 Alarm value set will be displayed.
When the FO2 50% Default is set On and FO2 Gas 1 is set for a numerical value, 10 minutes on the surface after that dive, FO2
for Gas 1 will be displayed as 50 and further dives will be calculated based on 50% O2 for oxygen calculations and 21% O2
for Nitrogen calculations (79% Nitrogen), unless the FO2 for Gas 1 is set before the dive.
FO2 for Gas 1 continues to reset to the FO2 50% Default after subsequent repetitive dives until 24 hours elapse after the last
dive, or the FO2 50% Default is turned Off.
When the FO2 50% Default is set Off, the FO2 for Gas 1 will remain at the last value saved for the remainder of that series of
repetitive dives.
FO2 SET FOR AIR
The default FO2 for Gas 1 each new dive period is AIR.
When FO2 for Gas 1 is set for AIR, calculations are the same as when it is set for 21%. When FO2 for Gas 1 is set to AIR, it
remains set for AIR until it is set for a numerical FO2 value (21 to 50%).
When FO2 is set only to AIR, the O2BG and PO2 values and/or warnings will not be displayed during the dive.
MODs affected by the PO2 limit set will not be displayed when FO2 for Gas 1 is set to AIR.
Internally, the AMPHOS keeps track of the O2 so that if FO2 for Gas 1 is subsequently set for a numerical value, the O2 accu-
mulated during previous AIR dives will be accounted for in the next Nitrox dive (during that dive period and series of repetitive
dives).
Once FO2 Gas 1 is set for a numerical value (21 to 50%) and a dive is made, the AIR option is disabled until 24 hours elapse
after the last dive. The AIR option will not be displayed in Set FO2 Gas 1 until a full 24 hour Surface Interval has elapsed.
If FO2 for Gas 1 is set for 21%, it will remain set for 21% for that series of dives until set for a higher numerical value.
If the FO2 50% Default is set Off, FO2 for Gas 2 will remain as previously set until it is changed. If the FO2 50% Default is set
On, FO2 for Gas 2 will Default to 50% after the dive.
SET F GROUP (FO2)
Selections >> Gas 1 > Gas 2 > 50% Default.
> A + S (2 sec), while viewing NORM SURF Main, will access Set F (Fig. 35).
> A (< 2 sec) will then access Set FO2 Gas 1.
SET FO2 GAS 1, information includes (Fig. 36):
> Max Depth with MAX and FT (or M) icons, allowed for the PO2 Alarm Set, blank if Air.
> PO2 Alarm set with PO2 icon, blank if Air.
> FO2 setting flashing with FO2 icon, either the graphic Air or Nitrox (numerical) value with NX icon.
> Tank 1 icon, representing gas (mix) 1.
> Graphic GAS1.
• S (hold) will scroll upward through the Set Points from Air to 21 through 50% in 1% increments, at a rate of 8 per second.
• The scroll will stop when S is released, or momentarily at 32% (even if S is held depressed).
• Depressing S again will resume the scroll from 32 through 50%, then stop at Air (or 21%).
• S (< 2 sec) will step upward through the Set Points one at a time.
• A (< 2 sec) will save the setting and access Set FO2 Gas 2.
• A + S (2 sec) will save the setting and revert to Set F.
• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.
SET FO2 GAS 2, information includes (Fig. 37):
> Max Depth with MAX and FT (or M) icons, allowed for the PO2 Alarm Set, blank if Air.
> PO2 Alarm set with PO2 icon, blank if Air.
> FO2 setting flashing graphic Air or Nitrox (numerical) value with NX icon.
> Tank 2 icon, representing gas (mix) 2.
> Graphic GAS2.
• S (hold) will scroll through the Set Points from AIR to 21 through 100% in 1% increments, at a rate of 8 per second.
• The scroll will start at the FO2 Gas 1 Set Point* and stop when S is released, or momentarily at 50%, then again at 80%,
then at the Gas 1 Set Point or at AIR (or 21%).
Fig. 35 - SET F GROUP
Fig. 36 - SET FO2 GAS 1
Fig. 37 - SET FO2 GAS 2