Manual Aeris A300 AI (page 20 of 52) (English)

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A300 AI OPERATING MANUAL

DEEP STOP (DS)

When the DS selection is set On, it will trigger during NORM No Deco dives when you descend to 80 FT (24 M) and calculate

(and continually update) a Stop Depth equal to 1/2 the Max Depth.

While 10 FT (3 M) deeper than the calculated DS, you will be able to access a DS Preview screen that will display the current

Deep Stop Depth (calculated) and Time (ﬁxed at 2 min) for 5 seconds then return to the Main.

Upon initial ascent to within 10 FT (3 M) below the calculated Stop Depth, a DS screen displaying a Stop Depth at 1/2 the Max

Depth will appear with a Countdown Timer beginning at 2:00 (min:sec) and counting down to 0:00.

> If you descend 10 FT (3 M) below, or ascend 10 FT (3 M) above, the calculated Stop Depth for 10 seconds during the

countdown, the No Deco Main will replace the DS Main display and the DS feature will be disabled for the remainder of

that dive. There is no Penalty if the DS is ignored.

> In the event that you enter Deco, exceed 190 FT (57 M), or a High O2 condition (=> 80%) occurs, the DS will be disabled

for the remainder of that dive.

> The DS is disabled during a High PO2 Alarm condition (=> Set Point).

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 disabled 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 On:

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 set On) 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 AI 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. 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 (Fig. 34a) and graphically as the TLBG (Fig. 34b).

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 (Fig. 35a).

Fig. 34 -NO DECO MAIN

(NDC is DTR)

Fig. 35 - NO DECO MAIN

(OTR is DTR)

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Aeris A300 AI Manual

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