Oceanic VT 4.0, Operating Manual

7

VT 4.0 OPERATING MANUAL

© 2002 Design, 2011

Doc. No. 12-5213-r02 (9/6/11)

AUDIBLE ALARM

While operating in NORM or GAUG Mode the Audible will emit 1 beep per second for 10 seconds when alarms strike, unless it is set Off.  During that 

time, the Audible can be acknowledged and silenced by pressing the S button (less than 2 seconds).  

An LED Warning Light, on the housing, is synchronized with the Audible and flashes as the Audible sounds.  It will turn Off when the Alarm is silenced.  The 

Audible and LED will not be active if the Audible is set OFF (a group A setting).

FREE Dive Mode has its own set of Alarms which emit 3 short beeps either 1 or 3 times which cannot be acknowledged or set OFF.

Alarms that strike during operations in Compass Mode are described on page 48.

Situations that will activate the NORM/GAUG 10 second Alarm include -

** Items apply only in NORM mode.

•  Air Time Remaining (ATR) at 5 minutes, then again at 0 minutes.

•  Turn Pressure at the Set Point selected (Transmitter 1 only).

•  End Pressure at the Set Point selected (active Transmitter).

•  Descent deeper than the Depth Alarm Set Point selected.

•  Dive Time Remaining at the Set Point selected**.

•  Elapsed Dive Time at the Set Point selected.

•  PO2 level at .20 < Set Point and again at the Set Point selected**.

•  O2 accumulation at 240 OTU (80%), then again at 300 OTU (100%)**.  

•  TLBG at the Set Point selected**.

•  Ascent Rate exceeds 60 FPM (18 MPM) when deeper than 60 FT (18 M), or 30 FPM (9 MPM) at 60 FT (18 M) and shallower.

•  Loss of the active Transmitter Link signal for more than 15 seconds during a dive.

•  Entry into Decompression Mode (Deco)**.

•  Conditional Violation (above a required Deco Stop Depth < 5 minutes)**.

•  Delayed Violation (above a required Deco Stop Depth => 5 minutes)**.

•  Delayed Violation (a Deco Stop Depth > 60 FT/18 M is required)**.

•  Delayed Violation (Depth > 330 FT/100 M in NORM, > 400 FT/120 M in GAUG).

•  A Gas Switch would expose the diver to PO2 => 1.60 ATA**.

A single short beep (which cannot be disabled) sounds when -

•  After 5 minutes on the surface after the Violation dive.

3 short beeps (which cannot be disabled) sound when -

•  Ascent Rate is 51 to 60 FPM (15.1 to 18 MPM) when deeper than 60 FT (18 M), or 26 to 30 FPM (7.5 to 9 MPM) at 60 FT (18 M) and shallower.

•  FREE Dive Elapsed Dive Time Alarm (3 beeps every 30 seconds if set On).

•  FREE Dive Depth Alarms 1, 2, 3 (set sequentially deeper) - each 3 beeps 3 times. 

•  FREE Dive TLBG Alarm (Caution zone, 4 segments) - 3 beeps 3 times. 

•  Entry into Deco during a FREE Dive (a Violation) - 3 beeps 3 times. 

•  Free Dive Mode Countdown Timer reaches 0:00 - 3 beeps 3 times.

During the following situations, the audible will not turn off when acknowledged - 

•  Delayed Violations.

•  Deco Stop Depth Violation => 70 FT/21 M stop required.

•  FREE mode alarms.

PC INTERFACE 

Interface with a PC, to allow uploading settings and downloading data, is accomplished by connecting the VT 4.0 to a PC USB Port using the special USB 

Interface Cable.  

The software program together with the USB Driver required is on the Oceanlog CD, and can be downloaded from the OceanicWorldwide web site.  The 

program's HELP** serves as the user manual which can be printed for personal use.  

**Prior to attempting to Download data from your VT 4.0 or Upload Settings to it, review the HELP section of the Oceanlog program.  Recommended is 

to print those sections of HELP that you consider appropriate for your Interface activities.

The Settings Upload portion of the Oceanlog program can be used to set/change the Set A group (Alarms), Set U group (Utilities), Set T (Time), etc. using 

the same Interface System.  FO2 and FREE Mode related items must be set using the control buttons.

Information available for retrieval (download) from the VT 4.0 to the PC Download portion of the program includes dive data such as number, surface 

interval time, maximum depth, elapsed dive time, no deco status, pressure, start date/time, lowest temperature under water, sampling rate, dive profile, 

and Set Points. 

The Oceanlog program also allows upgrade of select versions of the VT 4.0's firmware (operating system software) after which the VT 4.0 resets all operat-

ing data.  Since the upgrades require reset of the VT 4.0, they are blocked during 24 hours after dives.

•  Refer to page 50 for more details relating to Oceanlog and PC Interface.