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AMPHOS DC MANUAL
© 2002 Design, 2012 Doc. No. 12-5301-r01 (12/17/12)
DIVE TIME REMAINING (DTR)
The AMPHOS constantly calculates No Deco Time Remaining (NDC) and O2 Time Remaining (OTR), and displays whichever one
is the least amount available at the time as Dive Time Remaining (DTR).
No Deco Time Remaining (NDC)
NDC is the maximum amount of time that you can stay at your present Depth before entering Decompression. It is calculated
based on the amount of Nitrogen absorbed by hypothetical tissue compartments.
The rates each of these compartments absorb and release Nitrogen is mathematically modeled and compared against a maxi-
mum allowable Nitrogen level.
Whichever one is closest to this maximum level is the controlling compartment for that Depth. Its resulting value will be displayed
on the Dive Main screen as minutes NDC time (Fig. 66a) and graphically as the NIBG (Fig. 66b).
As you ascend from Depth during a dive, the NIBG segments will recede as control shifts to slower compartments.
This is a feature of the Decompression model that is the basis for multilevel diving, one of the most important advantages that
the AMPHOS offers.
O2 Time Remaining (OTR)
When FO2 is set for a numerical value (Nitrox), the O2BG (Fig. 67a) will add segments to represent oxygen accumulation for
that dive, or 24 hour period, whichever amount is greater.
When OTR becomes less than NDC, it is displayed as DTR on the Main Dive screen.
ASCENT RATE INDICATOR (ASC)
The ASC shows how fast you are ascending. When you exceed the maximum recommended Ascent Rate for the depth you are
at, the Audible will sound during which time all segments of the ASC and the graphic SLOW will flash on the Dive Main screen
(Fig. 68). The flashing will stop and normal information will be restored when the audible is silenced or your Ascent Rate is
slowed below the allowed rate.
The Ascent Rate alarm is based upon 2 sets of speeds which change at a reference depth of 60 FT (18 M). See page 13.
WARNING: At depths greater than 60 FT (18 M), ascent rates should not exceed 60 FPM (18 MPM).
At depths of 60 FT (18 M) and shallower, rates should not exceed 30 FPM (9 MPM).
NORM NO DECOMPRESSION DIVE MODE
When the Wet Activation feature is set ON, the AMPHOS will enter the NORM No Decompression Dive Mode any time you
descend to 5 FT (1.5 M) for 5 seconds.
When the Wet Activation feature is set OFF, the AMPHOS will not enter Dive Mode upon descent unless it is operating in one of
the NORM Dive Computer modes (menus) at that time. Modes such as Surface Mode, Plan, Fly, etc.
NORM NO DECO MAIN, information includes (Fig. 69) -
> Elapsed Dive Time (hr:min) with DIVE icon.
> Current Depth with FT (or M) icon.
> Dive Time Remaining (min) with NDC (or O2) and min icons.
> Gas (tank) icon, Gas in use (1 or 2).
> NX icon, if either gas is set for Nitrox.
> NIBG with N2 icon, representing nitrogen loading.
> ASC, while ascending, flashing when too fast.
• A (< 2 sec) to access ALT 1.
• A (2 sec) to access Deep Stop Preview, if set On and triggered.
• M (2 sec) to access the Gas Switch Preview.
• S (< 2 sec) to acknowledge/silence alarms.
• L (press) to activate Backlight.
NORM NO DECO ALT 1,information includes (Fig. 70) -
> Max Depth with MAX and FT (or M) icons.
> Time of Day (hr:min).
> Temperature with ° icon and graphic F (or C).
• A (< 2 sec) to access ALT 2.
• Operation will revert to Main after 5 seconds, if A is not pressed.
• L (press) to activate Backlight.
Fig. 66 - DTR (NDC)
b
a
Fig. 67 - O2BG
a
Fig. 68 - ASCENT ALARM
Fig. 69 - NO DECO MAIN
M
L
A
S
Fig. 70 - NO DECO ALT 1