Operation Manual

When set with an FO2 value of 'Air', the DataTrans Plus will perform calcula-

tions the same as if FO2 were set for 21% oxygen, internally accounting for

oxygen loading for any subsequent Nitrox dives. However, oxygen related dis-

plays, warnings, and the O2 bar graph will not appear on the LCD display for

that dive (Fig. 55), or subsequent dives, unless FO2 is set for a numerical value

(21 to 50 %).

Setting FO2 for a Nitrox Dive

You can program the DataTrans Plus for nitrogen-oxygen (nitrox) mixtures of

21% to 50% oxygen (O2) before each nitrox dive. If FO2 is set at a value of

21%, the unit will remain set as a '21% nitrox computer' for subsequent nitrox

dives until FO2 is set to a higher value, or the Display Module automatically

turns off. Once FO2 is set to a value 'greater than 21%' to match the nitrox

mix being used for that nitrox dive, the FO2 value displayed during the FO2

Mode that is accessible 10 minutes after that dive will be 50% (Fig. 56).

FO2 must be reset for each repetitive nitrox dive, or the value will automati-

cally default to 50 and the dives will be calculated based on 50% O2 for oxygen

calculations and 21% O2 (79% nitrogen) for nitrogen calculations. Once a dive

is made with the DataTrans Plus set as a nitrox computer (FO2 set for a nu-

merical value), the unit cannot be programmed to operate as an 'Air' computer

until 24 hours after the last dive. 'Air' will not be displayed as an option in the

FO2 Mode.

Fig. 55 - Dive Mode (Air)

Fig. 56 - FO2 Default

(after nitrox dive)

DECO

C.Z. C.Z.

PSI

NO DECO

DECO

C.Z. C.Z.

NO DECO