Oceanic VT 4.0, Operating Manual

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VT 4.0 OPERATING MANUAL
© 2002 Design, 2011 Doc. No. 12-5213-r02 (9/6/11)
OVERVIEW
> Can only switch when a Dive Main screen is displayed.
> Cannot Switch Gas or TMTs on surface.
> Cannot Switch Gas or TMTs during sounding of alarms.
> All NORM dives begin with Gas 1 and default to Gas 1 after 10 minutes on the surface.
> Switching Gas also switches TMTs, if being used.
The following will describe NORM GAS/TMT Switching, then GAUG TMT Switching.
NORM GAS SWITCH MENU,
information includes (Fig. 70):
While a Dive Main is displayed, M (2 sec) - to access the Menu.
> Graphic CHNG (change).
> Graphic selections GAS 1, GAS 2, GAS 3, GAS 4 with FO2 setting.
• A (< 2 sec) - to step forward (down) through selections
• M (< 2 sec) - to step back (up) through selections
• S (< 2 sec) - to access selection indicated by Arrow ( > ). A Gas Switch screen appears (Fig. 71 or 72).
Gas Switch To, information includes (Fig. 72):
> Graphics SWITCH TO - GAS 1 (2, 3, 4).
> Graphic AIR; or if Nitrox, the PO2 calculated and FO2 set for that Gas with icons.
• S (< 2 sec) - to confirm a Switch from the Gas in use to the Gas indicated (after 2 sec),
> display a TMT Search screen (Fig. 73) or Not Available message if the TMT is not reporting (Fig. 74),
> then after 10 sec, revert to Main with the new Gas/TMT selected.
If the Gas/TMT are not switched to the same source (tank) as the gas being breathed, ATR will increase to maximum after 1
minute without a change in transmitted Pressure.
Gas Switch Alarm
If a switch to the Gas would result in PO2 => 1.60, the Audible will sound and a warning message will flash (Fig. 75) until it is
silenced, then the Switch To screen will be restored.
> Due to the possibility that sufficient air may not be available in the Switch From tank, the switch will still be allowed.
> If the switch is made, the PO2 alarm will strike. If in Deco, indication to ascend will not be given (you control action to be
taken).
GAUG TMT SWITCH MENU, information includes (Fig. 76):
While a Dive Main is displayed, M (2 sec) - to access the Menu.
> Graphic CHNG (change).
> Graphic selections TMT 1, TMT 2, TMT 3, TMT 4 with graphic PRESSURE.
• A (< 2 sec) - to step forward (down) through selections
• M (< 2 sec) - to step back (up) through selections
• S (< 2 sec) - to access selection indicated by Arrow ( > ). A Search for TMT screen appears (Fig. 77), or a Not Available
message is displayed if the TMT is not reporting.
> After the TMT Search screen is displayed for 10 seconds, operation reverts to the Dive Main with the new TMT selected.
> If the TMT is not switched to the same source (tank) as the one being breathed from, ATR will increase to maximum after 1
minute without a change in transmitted Pressure.
Fig. 70 - NORM GAS MENU
Fig. 71 - GAS SWITCH
Fig. 72 - GAS SWITCH
Fig. 75 - GAS SWITCH
ALARM
Fig. 74 - TMT NOT
REPORTING
Fig. 73 - TMT SEARCH
Fig. 76 - GAUG TMT
SWITCH MENU
Fig. 77 - TMT SEARCH
Note that Figures 78 and 79 are no longer used.