Oceanic DataTrans Plus, Owner'S Manual

Page: 62 / 140

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Wh en set wit h an F O2 valu e of 'Air ', t h e Dat aTr an s P lu s will per for m calcu la-
t ion s t h e sam e as if F O2 wer e set for 21% oxygen , in t er n ally accou n t in g for
oxygen loadin g for an y su bsequ en t Nit r ox dives. H owever , oxygen r elat ed dis-
plays, war n in gs, an d t h e O2 bar gr aph will n ot appear on t h e LCD display for
t h at dive (F ig. 55), or su bsequ en t dives, u n less F O2 is set for a n u m er ical valu e
(21 t o 50 %).
S e t t in g F O2 fo r a N it ro x D ive
You can pr ogr am t h e Dat aTr an s P lu s for n it r ogen -oxygen (n it r ox) m ixt u r es of
21% t o 50% oxygen (O2) befor e each n it r ox dive. If F O2 is set at a valu e of
21%, t h e u n it will r em ain set as a '21% n it r ox com pu t er ' for su bsequ en t n it r ox
dives u n t il F O2 is set t o a h igh er valu e, or t h e Display Modu le au t om at ically
t u r n s off. On ce F O2 is set t o a valu e 'gr eat er t h an 21%' t o m at ch t h e n it r ox
m ix bein g u sed for t h at n it r ox dive, t h e F O2 valu e displayed du r in g t h e F O2
Mode t h at is accessible 10 m in u t es aft er t h at dive will be 50% (F ig. 56).
F O2 m u st be r eset for each r epet it ive n it r ox dive, or t h e valu e will au t om at i-
cally defau lt t o 50 an d t h e dives will be calcu lat ed based on 50% O2 for oxygen
calcu lat ion s an d 21% O2 (79% n it r ogen ) for n it r ogen calcu lat ion s. On ce a dive
is m ade wit h t h e Dat aTr an s P lu s set as a n it r ox com pu t er (F O2 set for a n u -
m er ical valu e), t h e u n it can n ot be pr ogr am m ed t o oper at e as an 'Air ' com pu t er
u n t il 24 h ou r s aft er t h e last dive. 'Air ' will n ot be displayed as an opt ion in t h e
F O2 Mode.
F ig. 55 - Dive Mode (Air )
F ig. 56 - F O2 Defau lt
(aft er n it r ox dive)
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DECO
C.Z. C.Z.
PSI FT
O2
NO DECO
0 5 10 20 30 40 50 60
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DECO
C.Z. C.Z.
O2
NO DECO
0 5 10 20 30 40 50 60