Operation Manual

OCS OPERATING MANUAL

FO2 set to Air

The default FO2 Gas 1 each new dive period will be Air. When FO2 Gas 1 is set for Air, calculations are the same as when

FO2 is set for 21%. When FO2 Gas 1 is set for Air, it will remain set for Air until set for a numerical FO2 value (21 to 100%).

When FO2 Gas 1 is set for Air, the O2BG will not be displayed at any time during the dive, on the surface, or during the PDPS.

PO2 will not be displayed during the dive.

The Max Operating Depth (MOD) will not be displayed on the FO2 set screen when Air is displayed.

Internally, the OCS will keep track of accumulated oxygen so that if FO2 for Gas 1 is subsequently set for Nitrox, O2 for previous

Air dives will be accounted for in the next Nitrox dive (during that dive period and series of repetitive dives).

FO2 set for Nitrox

When FO2 for any Gas is set for a numerical value, the dive is considered Nitrox and the Nx icon will be displayed.

Once FO2 Gas 1 is set for a numerical value (21 to 100%), the Air option is disabled until 24 hours elapse after the last dive.

• The Air option will not be displayed in Set FO2 for Gas 1 until a full 24 hour Surface Interval has elapsed.

• If the FO2 50% Default is set Off, FO2 remains at the values set until changed. If the Default is set On, all FO2 values

default to 50%.

DIVE TIME REMAINING (DTR)

The OCS constantly monitors No Deco status and O2 Accumulation, and will display whichever Time is the least amount avail-

able as DTR on the No Deco Dive Main screen (Fig. 63). The graphic NDC or OTR will identify the Time 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

NDC time (Fig. 63a) and graphically as the TLBG (Fig. 63b).

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 Oceanic dive computers offer.

O2 DTR (OTR)

When the OCS is set for Nitrox operation, O2 accumulation during a dive, or 24 hour period, is dis-

played as the O2BG on an ALT screen (Fig. 64a). As time remaining before reaching the O2 Exposure

Limit decreases, segments are added to the O2BG.

When the amount of time remaining before reaching the O2 Limit becomes less than the NDC, calculations for that Depth will be

controlled by O2 and OTR will be displayed as DTR on the Main.

ERROR (RESET DURING A DIVE)

If for any reason, the OCS shuts Off then turns On again during any Dive, the graphic ERR (Error) will be displayed with the Up

Arrow icon and current Depth with FT (or M) icon (Fig. 65).

If this occurs, it is highly recommended that you terminate the dive and begin a safe ascent to the surface.

Upon surfacing, ERR will be displayed for 5 seconds (Fig. 66) and operation will revert to Watch Mode.

Any time thereafter, when access to Dive Computer Operating Mode is attempted from Watch Mode, only the graphic ERR will

be displayed and operation will revert to Watch Mode. No Dive Computer modes/screens will be accessible.

If this occurs, the OCS must be returned to the factory for evaluation/service prior to any further use for diving activities.

Fig. 63 -NO DECO MAIN

Fig. 64 -NO DECO ALT 1

Fig. 65 -ERROR

(during dive)

Fig. 66 -ERROR

(after surfacing)