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SAfETY STOP (SS)
If set ON:
Upon ascent to within 5 FT (1.5 M) deeper than the SS Depth set for 1 second on a No Deco dive in which Depth exceeded 30
FT (9 M) for 1 second, a beep will sound and a SS at the Depth set will appear on the Main display with a countdown beginning
at the SS Time set and counting down to 0:00 (min:sec).
• If the SS was set for OFF or TIMER, this display will not appear.
• In the event that you descend 10 FT (3 M) deeper than the Stop Depth for 10 seconds during the countdown, or the
countdown reaches 0:00, the No Deco Main screen will replace the SS Main screen which will reappear upon ascent to
within 5 FT (1.5 M) deeper than the Safety Stop Depth set for 1 second.
• In the event that you enter Deco during the dive, complete the Deco obligation, then descend below 30 FT (9 M); the SS
Main will appear again upon ascent to within 5 FT (1.5 M) deeper than the SS Depth set for 1 second.
• If you surface prior to completing the SS, it will be disabed for the remainder of that dive.
• There is no Penalty if you surface prior to completing the SS or ignore it.
If set for TIMER:
Upon ascending to 20 FT (6 M) for 1 second on a No Deco dive in which Depth exceeded 30 FT (9 M) for 1 second, a beep will
sound and a Run Timer will appear (if selected for use) displaying 0:00 (min:sec) until started.
• If the SS was set for OFF or ON, the Timer display will not appear.
• If you descend deeper than 30 FT (9 M) for 10 seconds, the No Deco Main will replace the Timer screen which will
reappear upon ascent to 20 FT (6 M) for 1 second.
• If you enter Deco, or a High O2 alarm condition occurs (100%), while the SS Timer is active, the SS function will be
disabled for the remainder of that dive.
• If you surface prior to completing the SS, it will be disabled for the remainder of that dive.
DIVE TIME REMAINING (DTR)
The A300 CS constantly monitors nitrogen loading and oxygen accumulation, and will display whichever time is the least amount
available as DTR on the No Deco Dive Main screen (Fig. 38a). The graphic NDC, or OTR, will identify which time is being
displayed.
No Deco DTR (NDC)
NDC is the maximum amount of time that you can stay at your present Depth before entering Deco. 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 maximum allowable Nitrogen level.
Whichever one is closest to this maximum level is the controlling compartment for that Depth. Its resulting value will be displayed
as NDC time and graphically as the TLBG.
As you ascend, the TLBG 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 AERIS dive computers offer.
O2 Time Remaining (OTR)
During Nitrox operation, O2 accumulation during a dive, or 24 hour period, is displayed as a percent of O2 saturation allowed
per dive or per day. Max allowed (100%) is 300 OTU.
When time remaining before reaching the O2 limit becomes less than NDC, calculations for that Depth will be controlled by O2
and OTR will be displayed as DTR on the Dive Main.
Air Time Remaining (ATR)
ATR is calculated using a patented algorithm that is based on a diver's individual Air Consumption Rate and Current Depth. Tank
Pressure is measured once each second and an average rate of Consumption is calculated over a 90 second period. This Rate of
Consumption is then used in conjunction with the Depth to predict the Air required for the diver to make a safe controlled Ascent
including the No Deco Deep and Safety Stops and any required Deco Stops.
Air Consumption and Depth are continuously monitored and ATR reflects any change in circumstances. For example, when you
suddenly find yourself swimming against a strong current and begin breathing more rapidly, the A300 CS will recognize the
change and adjust ATR accordingly.
ATR is the time you can remain at the present Depth and still safely surface with the Tank Pressure reserve that you selected during
setup (End Pressure Alarm Setting).
ATR is displayed on the Dive Main screens (Fig. 38b).
ATR Alarm
When ATR decreases to 5 minutes, the Audible will sound and the ATR time digits and graphic will flash yellow (Fig. 39). If it
decreases to 0, the Audible will sound again. The time digits and graphic will continue to flash red until ATR becomes greater
than 1 minute, then it will flash yellow until greater than 5 minutes.
You should initiate a controlled Ascent while monitoring Tank Pressure. However, there is no reason to panic, the A300 CS has
allowed for the air necessary for a safe ascent including the No Deco Deep and Safety Stops, if set On, and any Deco Stops
required.
© 2002 Design, 2014
25
A300 CS OPERATING MANUAL
a
104
BATT
F F T
NDC
0:16
GAS 1
ATR
1750
73
TL
PSI
Fig. 38 -NO DECO MAIN
(NDC is DTR)
68
BATT
FT
NDC
0:11
GAS 1
ATR
540
TL
PSI
Fig. 39 - NO DECO MAIN
(ATR 5 min warning)
Doc. No. 12-7287-r03 (7/14/14)
b
AR
AR
5
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