Operation Manual

DataPlus

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either per dive allowable O2 or 24 hour period allowable O2. As your exposure,

oxygen tolerance dose (OTU), increases during the dive, segments will fill the

graph to form an arc along the right perimeter of the LCD. As your OTU level

decreases, the bar graph will begin to recede, indicating that additional exposure

is allowed for the dive, or 24 hour period.

The O2 bar graph also assists you with managing high PO2 levels. When partial

pressure of oxygen reaches a value of 1.40 BAR (ATA), the PO2 level will appear

as a digital display on the LCD. Once the partial pressure of oxygen reaches the

maximum allowable limit of 1.60 BAR (ATA), the O2 bar graph's large red

Danger Zone will be displayed (Fig.11a), flashing as a warning until PO2 de-

creases below 1.60 BAR. If additional O2 'exposure' is still allowed for that dive,

or 24 hour period, a gap (Fig. 11b) will be present between those bar graph

segments (Fig. 11c) and the red segment. This is explained in more detail on

page 23 and in the Handling the Extremes section.

When rising towards the surface, the Variable Ascent Rate Indicator

™

(Fig.

12) shows how fast you are ascending. The Variable Ascent Rate Indicator

(VARI) will alert you with flashing segments if you enter the red zone, which

represents ascent rates faster than 60 feet (18 meters) per minute. Immediately

slow your ascent when you see the 5 segments flashing.

Even if you have not entered decompression, a safety stop made between 15-20

feet (5-6 meters) is strongly recommended as a standard procedure before

Fig. 12 - Variable Ascent

Rate Indicator™ (VARI)

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Fig. 11 - O2 Bar Graph