Oceanic DataTrans Plus Owner's Manual
DataTrans Plus
owner's guide
DataTrans Plus
Pay special attention to items marked with this Warning symbol.
WARNINGS:
• The DataTrans Plus is intended for use by recreational divers who have successfully completed a
nationally recognized course in scuba diving, and diving with enriched nitrogen-oxygen (nitrox)
mixtures.
• It is intended only for no decompression diving, NOT intentional decompression diving.
• It must not be used by untrained persons who may not have knowledge of the potential risks and
hazards of scuba diving, and diving with enriched nitrogen-oxygen (nitrox) mixtures.
• You must obtain scuba certification, and certification in diving with enriched nitrogen-oxygen
mixtures (nitrox) before using the DataTrans Plus if you have not already done so.
• It is NOT for use by military and commercial divers.
• It should NOT be utilized for any competitive, or repetitive square wave or decompression diving, as
it is intended solely for recreational use and no decompression multilevel diving.
• As with all underwater life support equipment, improper use or misuse of this product can cause
serious injury or death.
• Never participate in sharing or swapping of a dive computer.
• Conduct your dives in such a manner so as to insure that you continuously check the computer's
proper function.
• Read and understand this owner’s guide completely before diving with the DataTrans Plus.
• If you do not fully understand how to use this dive computer, or if you have any questions, you should
seek instruction in its use from your authorized Oceanic dealer before you utilize this product.
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LIMITED TWO-YEAR WARRANTY
Oceanic guarantees, to the original purchaser only, that the DataTrans Plus will be free of defects in materials and/or craftsmanship
under normal recreational multilevel scuba use for two years from date of purchase, provided proper care and annual service are performed as described within this owner’s guide. Should your DataTrans Plus prove to be defective for any reason (other than those listed
in the limitations section below) it will be repaired or replaced (at Oceanic’s discretion) free of charge excluding shipping and handling
charges.
This warranty will be considered void if the DataTrans Plus was purchased from anyone other than an Authorized
Oceanic Dealer, and/or if the registration card is not filled out completely at the time of purchase and mailed to Oceanic within 30 days
of purchase, and/or if the annual inspection is not done according to this owner’s guide. This warranty is non-transferrable and applies to
the original purchaser only. All correspondence concerning this warranty must be accompanied by a copy of the original sales receipt and
a copy of the owner’s portion of the warranty registration card including the annual inspection record.
Once each year you must return the DataTrans Plus to an Authorized Oceanic Dealer within 30 days of the original
purchase date anniversary to keep the two year limited warranty in force. Annual inspection includes verification of depth
accuracy and proper general function. Labor charges for the annual inspection are not covered by the warranty. You must provide a copy
of the original sales receipt and a copy of the owner’s portion of the warranty registration card including the annual service record to
obtain warranty service.
Statement of Limitations - General:
Warranty does not cover damage from accident, abuse, battery leakage, tampering, lack of proper care and maintenance
and/or proper annual servicing, or improper use of the DataTrans Plus. Modifications or repair by anyone other than an
Oceanic Sales & Service Center authorized to service the DataTrans Plus will void the warranty. Oceanic will not be responsible for
recovery or replacement of the product in the event of loss or theft. Oceanic, its distributors, and retailers make no warranties, either
expressed or implied, with respect to this product or its owner’s guide except those stated in the preceding paragraphs. In consideration
of the sale of the DataTrans Plus to you, you agree and understand that in no event will Oceanic, its distributors or
retailers, be held liable for any personal injuries resulting from its operation, or for any other damages whether direct,
indirect, incidental, or consequential even if Oceanic is advised of such damages. Warranty does not extend to plastic
gauge face, o-rings, batteries, or damage due to accident, abuse, modification, or tampering.
Some states do not allow the exclusion or limitation of implied warranties or liabilities for incidental or consequential damages, so the
above limitation may not apply to you.
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DataTrans Plus
COPYRIGHT NOTICE
This owner’s guide is copyrighted, all rights are reserved. It may not, in whole or in part, be copied, photocopied, reproduced, translated,
or reduced to any electronic medium or machine readable form without prior consent in writing from Oceanic / 2002 Design. The Surface
Time/Mode, Plan Mode, Breathing Gas Time, No Decompression Time, Decompression Stop Time, Dive Log, Transmitter Low Battery,
Receiver Low Battery, Link, Temperature, Elapsed Dive Time, Maximum Depth, Ascent Rate, Breathing Gas Consumption, and Caution
Zone icons are protected by copyright, and are trademarks of Oceanic.
DataTrans Plus Owner's Guide, Doc. No. 12-2022
© 2002 Design 1997
2002 Davis Street
San Leandro, Ca. USA 94577
510/562-0500
TRADEMARK NOTICE
Oceanic, the Oceanic logo, DataTrans Plus, the DataTrans Plus logo, DX3 Integrated, Oceanglo, Graphic Diver Interface, Tissue Loading
Bar Graph, Pre Dive Planning Sequence, Variable Ascent Rate Indicator, Breathing Gas Time Remaining, Message Box, Set Point, Control
Console, and OceanLog are all registered and unregistered trademarks of Oceanic. All rights are reserved.
PATENT NOTICE
U.S. Patents have been issued, or applied for, to protect the following design features:
Graphic Diver Interface, Pre Dive Planning Sequence, Dive Time Remaining, Breathing Gas Time Remaining Bar Graph, Variable
Breathing Gas Consumption Bar Graph, DataTrans Plus Message Box, DataTrans Plus Mode Menu Structure, Breathing Gas Alarm Set
Point, Depth Alarm Set Point, Breathing Gas Time Remaining (U.S. Patent no. 4,586,136), Data Sensing and Processing Device (U.S.
Patent no. 4,882,678), Tissue Loading Bar Graph (U.S. Patent no. 4,882,687), and Variable Ascent Rate Indicator Bar Graph (U.S. Patent
no. 5,156,055).
DECOMPRESSION MODEL
The programs within the DataTrans Plus simulate the absorption of nitrogen into the body by using a mathematical model. This model is
merely a way to apply a limited set of data to a large range of experiences. The DataTrans Plus dive computer model is based upon the
latest research and experiments in decompression theory. Still, using the DataTrans Plus, just as using the U.S. Navy (or other)
No Decompression Tables, is no guarantee of avoiding decompression sickness, i.e. “the bends.” Every diver’s physiology is
different, and can even vary from day to day. No machine can predict how your body will react to a particular dive profile.
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FCC ID: MH8A
FCC Compliance:
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: 1) this device may not cause
harmful interference, and 2) this device must accept any interference received, including interference that may cause undesired operation.
FCC Interference Statement:
This equipment has been tested and found to comply with the limits for an Intentional Radiator, a Class B Digital Device, pursuant to
Part 15 of FCC Rules, Title 47 of the Code of Federal Regulations. These limits are designed to provide reasonable protection against
harmful interference in a commercial or residential installation. This equipment generates, uses, and can radiate radio frequency energy,
and if not installed and used in accordance with the instructions, may cause interference to radio communications.
There is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or
television reception, which can be determined by turning the equipment on and off, the user is encouraged to try to correct the interference by one or more of the following measures:
a. Reorient or relocate the receiving antenna.
b. Increase the separation between the equipment and the affected receiver.
c. Connect the equipment and the affected receiver to power outlets on separate circuits.
d. Consult the dealer or an experienced radio/TV technician for help.
WARNING: Changes or modifications not expressly approved by Oceanic could void the user's authority to operate
the equipment.
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DataTrans Plus
CONTENTS
FEATURES & DISPLAYS............................................................ 1
Introduction ..................................................................................................................2
Interactive Control Console .........................................................................................4
Informational Displays.................................................................................................5
Universal Graphic Diver Interface ..............................................................................6
Tissue Loading Bar Graph .......................................................................................7
Oxygen Accumlation Bar Graph..............................................................................8
Variable Ascent Rate Indicator ................................................................................9
Breathing Gas Consumption Indicator .................................................................10
Breathing Gas Time Remaining Bar Graph .........................................................11
Dive Time Remaining.................................................................................................11
Breathing Gas Time Remaining ............................................................................12
No Decompression Dive Time Remaining ............................................................14
Oxygen Accumulation Time Remaining ...............................................................15
Alpha Numeric Displays.............................................................................................15
Cylinder Pressure Display......................................................................................15
Depth Displays........................................................................................................16
Time Displays .........................................................................................................17
Ambient Temperature Display ..................................................................................18
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CONTENTS (continued)
Audible Alarm.............................................................................................................19
Message Box................................................................................................................21
Backlight Feature .......................................................................................................21
Operating Temperature .............................................................................................22
Sharing the DataTrans Plus ......................................................................................23
Graphic Interface Legend ..........................................................................................24
ACTIVATION & SETUP............................................................. 25
Making the DataTrans Plus Personal.......................................................................26
Activating the Display ................................................................................................27
Surface Mode ..............................................................................................................31
Mode Menu System ....................................................................................................31
Entering Settings .......................................................................................................33
Set Time ..................................................................................................................33
Set Date...................................................................................................................34
Set Alternate Display .............................................................................................35
Set Units of Measure ..............................................................................................36
Breathing Gas & Depth Alarm Set Points ............................................................37
Depth Alarm Set Point.......................................................................................37
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DataTrans Plus
CONTENTS (continued)
Breathing Gas Alarm Set Point .........................................................................38
Set Depth & Breathing Gas Alarms ..................................................................39
Turning Off the Audible Alarm .........................................................................40
Linking Procedure..................................................................................................41
Set Language ..........................................................................................................43
Language Correction Procedure ........................................................................44
PREDIVE & DIVE MODES ....................................................... 45
Positioning of the Display Module.............................................................................47
Link Interruption Underwater ..................................................................................47
Operational Modes......................................................................................................48
FO2 Mode....................................................................................................................49
FO2 Set for Air .......................................................................................................49
Settings FO2 for Nitrox .........................................................................................50
Plan Mode ...................................................................................................................52
No Decompression Dive Mode ...................................................................................55
Decompression Dive Mode .........................................................................................56
Violation Modes ..........................................................................................................57
Gauge Mode ................................................................................................................57
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CONTENTS (continued)
Ascending to the Surface............................................................................................57
Altitude Diving ...........................................................................................................59
POST DIVE MODES .................................................................. 61
Post Dive Surface Mode..............................................................................................62
Transition Period....................................................................................................62
FO2 Mode....................................................................................................................63
Plan Mode ...................................................................................................................63
Time to Fly..................................................................................................................64
Dive Log Mode ............................................................................................................65
History Mode ..............................................................................................................68
External Access Mode.................................................................................................69
HANDLING THE EXTREMES.................................................. 71
Emergency Decompression ........................................................................................72
Gas Time Remaining During Decompression.......................................................75
Caution Zone (C.Z.).................................................................................................76
Decompression Dive Mode .....................................................................................77
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DataTrans Plus
CONTENTS (continued)
Violation Modes ..........................................................................................................79
Conditional Violation Mode ...................................................................................79
Delayed Violation Mode..........................................................................................80
Immediate Violation Mode.....................................................................................83
Gauge Mode ............................................................................................................84
Permanent Violation ..............................................................................................84
Exceeding Maximum Operating Depth.....................................................................85
Oxygen Exposure........................................................................................................86
Partial Pressure of Oxygen ....................................................................................87
High PO2 Dive Mode..............................................................................................87
Oxygen Accumulation ............................................................................................88
High Oxygen Accumulation ...................................................................................89
Message Box Warnings ...............................................................................................90
Unexpected Loss of Displayed Information ..............................................................90
CARE & MAINTENANCE.......................................................... 93
Care and Cleaning ......................................................................................................94
Annual Inspections & Service....................................................................................95
How to Obtain Service ...........................................................................................96
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CONTENTS (continued)
Battery Life.................................................................................................................97
Low Battery Condition ...............................................................................................99
Battery Replacement ..............................................................................................99
Flooded Battery Compartment ............................................................................101
Transmitter Installation Instructions.....................................................................102
Transmitter Compatibilty with Nitrox ...................................................................103
REFERENCE ............................................................................ 105
More About Flying After Diving..............................................................................106
More About Altitude Diving.....................................................................................107
More About Nitrox Diving .......................................................................................109
Multiple Tissue Tracking .........................................................................................110
No Decompression Limits ........................................................................................112
Repetitive Decompression Diving............................................................................112
Specifications ............................................................................................................114
Responsible Computer Diving .................................................................................117
Language Cross Reference .......................................................................................118
Glossary.....................................................................................................................121
Accessories ................................................................................................................125
DataTrans Plus Service Record ...............................................................................126
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DataTrans Plus
FEATURES
and
DISPLAYS
1
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INTRODUCTION
Welcome to Oceanic and thank you for choosing DataTrans Plus!
Your new DataTrans Plus is a two component, hoseless, integrated system that consists of a computer Display
Module and a radio frequency Transmitter that will be installed into a high pressure port of your regulator
first stage, or is built into an Oceanic DX3™ Integrated first stage regulator. The transmitter sends tank pressure data to the display module via a low frequency signal. In addition to nitrogen and oxygen loading data,
breathing gas consumption is calculated and displayed in graphic and alpha/numerical formats on the
computer’s screen. The Display Module can also be used without the transmitter as a stand alone, non-integrated computer, and will retain full use of all functions except those that related to tank pressure.
Your DataTrans Plus presents the information that you need before, during, and after your air (or nitrox)
dives using Oceanic's intuitive combination of easy to read displays and unique identification icons. Tissue
loading of nitrogen, accumulation of oxygen, ascent rate, breathing gas consumption rate, and breathing gas
time remaining are presented as segmented bar graphs alongside color coded reference indicators that bring
quick focus to these important status displays.
As you progress through this instructional guide, you will become familiar with all of the unique functions and
features available and see examples of the displays that you could expect to see in the various operational
modes. Refer to the Glossary of terms on page 121, and keep the waterproof Review Card handy during your
dive trips. Although it will require an initial investment of time to become acquainted with the various icons
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DataTrans Plus
and bar graphs of the Graphic Diver Interface, you’ll soon agree that the DataTrans Plus is easy to understand and use.
The DataTrans Plus has a wide array of features described in detail throughout the pages that follow. Due to
the importance that they be understood thoroughly prior to using the DataTrans Plus, information will be expanded upon and some refreshed as you proceed. Relax and read through the complete guide.
It is extremely important that you:
• Read this owner's guide in sequence and understand it completely before attempting to use
the DataTrans Plus.
• Check the DataTrans Plus frequently during your dive.
• You must also be a trained diver, certified by a recognized training agency in Scuba diving.
• Prior to using the oxygen related features of the DataTrans Plus, you must also be trained
and certified for diving with enriched nitrogen-oxygen (nitrox) mixtures by a recognized
training agency.
Remember that the rules you learned in your basic scuba certification course still apply to the diving you will
do while using a dive computer - some will become even more important. Technology is no substitute for common sense, and a dive computer only provides the person using it with data, not the knowledge to use it.
Be a RESPONSIBLE DIVER at all times.
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INTERACTIVE CONTROL CONSOLE
(Surface Modes)
Oceanglo
Backlight
(Dive Modes)
Fig. 1 - Interactive
Control Console
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®
SelectAdvance
Alternate
Display
The DataTrans Plus is a unique dive computer with interactive controls that
allow you to select various display options and access specific information
when you choose to see it. The Interactive Control Console consists of the Ad-
vance (Left) button and Select (Right) button (Fig. 1).
The control buttons can be pressed repeatedly, releasing upon hearing a beep,
or held in to scroll and continue as you set or access different display modes.
On the surface, before diving, you can perform the following operations using
the Control Console:
• Activate the display module
• Select units of measure - English or Metric
• Select Message Box™ language - English, Italian, German, Spanish, or
French
• Set depth & gas alarm warning level Set Points™
• Turn the audible alarm - on or off
• Turn the Alternate Dive Mode display - on or off
• Set the current date & time
• Set the display module/transmitter link code
Also while on the surface, you can access the following modes with the Control
Console:
• FO2 mode - to program the percentage of oxygen in the nitrox mix.
• Plan mode - to view no decompression limits and plan your next dive.
• Log mode - to view data from your 12 most recent dives.
• History mode - to view the total number of dives, maximum depth, etc.
• Set mode - to establish prefered selections.
• External Access mode - to download (copy) dive data from the
DataTrans Plus to a unique PC log/profile program.
During the Dive mode, the Advance (Left) button can be used to activate the
display's Oceanglo™ backlight, and the Select (Right) button can be used to access an Alternate Dive mode, that displays additional information including
maximum depth, bottom time and temperature.
INFORMATIONAL DISPLAYS
DataTrans Plus
NO DECO
C.Z. C.Z.
DECO
O
2
Operational modes and status information is visually represented numerically
and/or graphically and can be understood at a glance with the aide of universal
icons (Fig. 2) that identify and bring quick focus to the displays. Also, segmented
bar graphs will show how close you are to critical limits.
In critical situations, a Message Box™ flashes urgent messages, while an au-
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Fig. 2 - Universal Icons
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C.Z. C.Z.
NO DECO
0
DECO
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30
20
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Fig. 3 - Message Box
C.Z. C.Z.
NO DECO
DECO
PSI
BAR
MAX
FT
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simple messages (Fig. 3), such as “TOO FAST” or “TOO DEEP" are displayed
in the language that you choose during setup.
Each DataTrans Plus numeric and graphic display represents a
unique piece of information. It is imperative that you understand
the formats, ranges, and values of the information represented to
dible alarm sounds to alert you to check this information. These concise,
60
avoid any possible misunderstanding that could result in error.
NOTE: Throughout this owner's guide reference is made to the
term 'breathing gas'. The rational being that the DataTrans
Plus can be used for 'air' dives or 'nitrox' dives. For clarity
these terms are defined as -
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Breathing Gas - the gaseous mixture breathed during a dive.
Air - a breathing gas that contains approximately 21% oxygen
and 79% nitrogen (nature's common nitrogen-oxygen mixture).
Nitrox - a nitrogen-oxygen breathing gas that contains a higher
fraction of oxygen (22 to 50%) than air.
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Fig. 4 - Bar Graph Displays
6
UNIVERSAL GRAPHIC DIVER INTERFACE
™
Five bar graphs referred to as the Universal Graphic Diver Interface™ appear
around the perimeter of the DataTrans Plus screen (Fig. 4). These segmented
R2
bar graphs are located next to green, yellow, and red color coded portions of the
peripheral decal that denote normal, caution, and danger zones, respectively.
When underwater, you can quickly focus on the bar graphs to make sure that
they are in the green. You can quickly verify that you're not getting too close
to the no decompression limit or the oxygen tolerance limit, or ascending too
fast, or consuming breathing gas too fast, or running low on breathing gas.
DataTrans Plus
Tissue Loading Bar Graph
™
The Tissue Loading Bar Graph™ represents nitrogen loading (Fig. 5), showing
your relative no decompression or decompression status. As your depth and
elapsed dive time increase, segments will add to the graph beginning in the
lower left portion of the screen. As you ascend to shallower depths, this bar
graph will begin to recede, indicating that additional no decompression time is
allowed for multilevel diving.
The Tissue Loading Bar Graph monitors 12 different nitrogen compartments
simultaneously and displays the one that is in control of your dive. It is divided
into a green No Decompression zone (NO DECO), a yellow Caution zone (C.Z.),
and a red Decompression zone (DECO). The bar graph gives a visual representation of just how close you are to the no decompression limit with a yellow
Caution (C.Z.) Zone.
This Caution Zone portion of the bar graph (Fig. 5a) allows you to make a decision regarding safety stop duration or necessity. While you cannot provide a
a
NO DECO
C.Z. C.Z.
DECO
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b
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Fig. 5 - Tissue Loading
Bar Graph
7
NO DECO
®
C.Z. C.Z.
DECO
guarantee against the occurrence of decompression sickness, you may choose
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your own personal zone of caution based upon age, physique, excessive weight,
etc., to reduce the statistical risk.
FT
The Tissue Loading Bar Graph assists you with managing decompression by
filling a large red 'ceiling stop required' segment (Fig. 5b). Decompression is
explained in detail in the Handling the Extremes section.
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Fig. 6 - Nitrogen Control
NO DECO
C.Z. C.Z.
DECO
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a
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Fig. 7 - Oxygen Accumulation
(O2) Bar Graph
8
Prior to a repetitive nitrox dive, if all segments of the Tissue Loading Bar
Graph are displayed during the Pre Dive Planning Sequence™, and no segments of the O2 bar graph are displayed (Fig. 6), that next dive is calculated to
be controlled by nitrogen loading.
WARNING: Oceanic advocates responsible diving practices
consistent with your individual level of formal training and experience, and does not recommend decompression diving or
diving below 130 feet (39 m).
Oxygen Accumulation (O2) Bar Graph
NOTE: Displays associated with oxygen and the O2 bar graph
will only appear if FO2 has been set at a value other than 'Air'.
The Oxygen Accumulation (O2) Bar Graph (Fig. 7) represents oxygen loading,
your relative oxygen tolerance dosage (OTU), showing the maximum of either
per dive allowable oxygen, or 24 hour period allowable oxygen. As your exposure (accumulation of oxygen) increases during the dive, segments will add to
the graph around the upper right perimeter of the screen. As accumulation
decreases, the bar graph will begin to recede, indicating that additional exposure (accumulation) is allowed for that dive, and that 24 hour period.
DataTrans Plus
NO DECO
C.Z. C.Z.
DECO
O
2
FT
The O2 Bar Graph also assists you with managing high partial pressure of oxygen (PO2) by flashing the large red Danger zone segment (Fig. 7a) as a warning when the level of PO2 exceeds the maximum allowed limit of 1.60 BAR
(ATA). This is explained in detail in the Handling the Extremes section.
Prior to a repetitive nitrox dive, if the segments of the O2 Bar Graph are displayed during the Pre Dive Planning Sequence™ (PDPS), and no segments of
the Tissue Loading Bar Graph are displayed (Fig. 8), that next dive is calculated to be controlled by oxygen loading.
Variable Ascent Rate Indicator
™
The Variable Ascent Rate Indicator™ (VARI), located along the lower/right
portion of the screen (Fig. 9), is provided to help you to avoid excessive ascent
rates by providing a visual representation of ascent speed, rather than just
showing that you are ascending too fast.
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Fig. 8 - Oxygen Control
NO DECO
0
5
C.Z. C.Z.
DECO
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Fig. 9 - Variable Ascent
Rate Indicator
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VARI Segments = Speed (rate)
0 = 0 - 10 fpm (0 - 3 mpm)
1 = 11 - 20 fpm (3 - 6 mpm)
2 = 21 - 30 fpm (6 - 9 mpm)
3 = 31 - 40 fpm (9 - 12 mpm)
4 = 41 - 50 fpm (12 - 15 mpm)
5 = 51 - 60 fpm (15 - 18 mpm)
6 = 61 - 90 fpm (18 - 27 mpm)
7 = 91 - 120 fpm (27 - 36 mpm)
8 = >120 fpm (>36 mpm)
(when > 5, the segments flash)
NO DECO
0
5
C.Z. C.Z.
DECO
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The 8 triangular segments of the bar graph, located beside green, yellow, and
red reference zones, appear beginning from the bottom and may be considered
an ascent rate speedometer. Green is a 'normal' rate, yellow is a 'caution' rate,
and red is 'Too Fast'. The actual speeds that the VARI segments represent are
shown at the left.
When your ascent rate exceeds the maximum recommended rate of 60 feet (18
meters) per minute, the bar graph segments will enter the red zone and all displayed segments will flash once per second until your ascent speed is slowed.
When this occurs, you should immediately slow your ascent.
The Variable Ascent Rate Indicator is a unique feature of Oceanic dive computers that has been granted U.S. Patent No. 5,156,055.
Breathing Gas Consumption Indicator
The Breathing Gas Consumption Indicator bar graph located at the lower/left
portion of the display (Fig. 10) is a true biofeedback monitor that indicates
your current breathing rate as compared to your personally established
breathing parameters. The comparison is based upon an average rate established during the first 70 seconds of breathing that is sensed.
Fig. 10 - Breathing Gas
Consumption Indicator
10
After the comparison, the bar graph will provide you with continuous visual
indication of your breathing rate as it slows or increases. Use of Oceanic's pat-
ented (U.S. Patent No. 4,586,136) breathing gas consumption calculation
method makes information accurate even during sudden changes in depth.
Breathing Gas Time Remaining Bar Graph
The Breathing Gas Time Remaining Bar Graph located along the bottom of
the display (Fig. 11) provides a graphic representation of the time that you can
remain at your present depth and then, following a safe ascent, surface with a
predetermined breathing gas reserve. This calculation and display is based on
your breathing gas consumption rate that is continually monitored by the
DataTrans Plus, and it takes into account the breathing gas required for a safe
ascent including any required decompression stops.
DataTrans Plus
The green, yellow, and red zones adjacent to the bar graph enable you to
quickly focus on remaining breathing gas times of 60 minutes or less, based on
your pre selected Gas Alarm Set Point. The bar graph is more precise as time
remaining decreases toward the red zone.
DIVE TIME REMAINING
One of the most important pieces of information on the DataTrans Plus is the
patented Dive Time Remaining numeric display. To numerically display Dive
Time Remaining, the DataTrans Plus constantly monitors three critical pieces
of information; no decompression status, oxygen accumulation status, and rate
NO DECO
0
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C.Z. C.Z.
DECO
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Fig. 11 - Breathing Gas
Time Remaining Bar Graph
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(No Decompression Time)
(Breathing Gas Time)
(Oxygen Accumulation Time)
Fig. 12 - Dive Time
Remaining Identification
NO DECO
C.Z. C.Z.
DECO
PSI
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FT
of breathing gas consumption. The Dive Time Remaining display will indicate
the time that is more critical for you at that particular moment (i.e.; whichever
time is the least amount available of the three). The time being displayed is
identified by the No Decompression Dive Time icon, or Gas Time Remaining
icon displayed to the left of the numeric display, or the O2 symbol displayed to
the right of the numeric display (Fig. 12).
Knowing that you have 45 minutes of no decompression time remaining is not
as critical as knowing that you only have 40 minutes of breathing gas time remaining. Or, knowing that you have 40 minutes of breathing gas time remaining is not as critical as knowing that you only have 35 minutes of oxygen accumulation time remaining. The DataTrans Plus presents the dive time remaining that is considered to be of primary importance. This unique feature of select Oceanic dive computers has been granted U.S. Patent No. 4,586,136.
Breathing Gas Time Remaining
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Fig. 13 - Breathing Gas
Time Remaining
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a
Breathing Gas Time Remaining will appear as the numeric Dive Time Remaining display (Fig. 13) only when it is less than No Decompression Time Remaining and Oxygen Accumulation Time Remaining. Breathing Gas Time Remain-
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ing of 60 minutes, or less, will be displayed continuously as the Gas Time Remaining Bar Graph (Fig. 13a) regardless of which time is being displayed as
the numeric Dive Time Remaining. The bar graph represents only Breathing
Gas Time information and it will be the only indication of breathing gas time
remaining if you are in a decompression or violation mode.
The DataTrans Plus calculates Breathing Gas Time Remaining using a pat-
ented algorithm that is based on a diver's individual breathing gas consumption rate and depth. Tank pressure is measured once each second, and an average rate of consumption is calculated over a 90 second period. This rate of
consumption is then used in conjunction with a knowledge of the depth dependence to predict the breathing gas required for a safe ascent including any required decompression stops.
Breathing gas consumption and depth are continuously monitored, and
Breathing Gas Time Remaining reflects any change in your circumstances.
For example, when a buddy starts breathing from your octopus or you suddenly find yourself swimming against a strong current and begin breathing
more rapidly, the DataTrans Plus will recognize this change and adjust your
Breathing Gas Time Remaining accordingly.
DataTrans Plus
Remember, the Breathing Gas Time Remaining is the time you can remain at
the present depth and still surface with the tank pressure reserve (Gas Alarm
Set Point) that you set during setup. When Gas Time Remaining indicates
zero, you should immediately initiate a controlled ascent. However, there is no
reason to panic, the DataTrans Plus has allowed for the breathing gas necessary for a safe ascent including any emergency decompression stops.
R
E
S
P
O
N
R
E
V
I
D
E
S
L
I
B
13
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No Decompression Dive Time Remaining
No Decompression Dive Time Remaining is the maximum amount of time that
you can stay at your present depth before entering a decompression situation.
It is calculated based on the amount of nitrogen absorbed by twelve 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 of the twelve is closest to this maximum level is the controlling compartment for that depth. Its resulting value
will be displayed numerically along with the No Decompression Dive icon and
graphically as the Tissue Loading Bar Graph (Fig. 14).
NO DECO
0
5
C.Z. C.Z.
DECO
PSI
10
30
20
®
O
2
FT
60
40
50
Fig. 14 - No Decompression
Dive Time Remaining
14
As you ascend from depth following a dive that has approached the no decompression limit, the Tissue Loading Bar Graph will diminish 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 the
DataTrans Plus offers. See the Reference section for more information pertaining to tissue tracking.
The no decompression algorithm is based upon Haldane’s theory using maximum allowable nitrogen levels developed by Merrill Spencer. Repetitive diving
control is based upon experiments designed and conducted by Dr. Ray Rogers
and Dr. Michael Powell in 1987. Diving Science and Technology® (DSAT), a
corporate affiliate of PADI®, commissioned these experiments and now uses
the findings in the Recreational Dive Planner™ distributed by PADI.
Oxygen Accumulation Time Remaining
Oxygen accumulation (exposure) during a dive, or 24 hour period, appears
graphically as the O2 Bar Graph. As time remaining before reaching the oxygen exposure limit decreases, segments are added to the O2 bar graph. When
the amount of time remaining before reaching the oxygen limit becomes less
than the No Decompression Dive Time Remaining or Breathing Gas Time Remaining, calculations for the dive will be controlled by oxygen. Oxygen Time
Remaining will then appear as the main numeric time display (Fig. 15a) as signified by the O2 symbol appearing to the right of the display.
As oxygen accumulation continues to increase, the O2 bar graph will enter the
yellow Caution Zone. High O2 Mode is explained in detail in the Handling the
Extremes section.
ALPHA/NUMERIC DISPLAYS
DataTrans Plus
DECO
a
O
2
PSI
FT
b
NO DECO
C.Z. C.Z.
R2
Cylinder Pressure Display
The Cylinder Pressure display, located in the upper/left portion of the screen
(Fig. 15b), indicates how much breathing gas is in your cylinder, up to 5000
PSI (352 BAR) to nearest 10 PSI (.5 BAR).
5
10
30
0
20
®
60
40
50
Fig. 15 - Oxygen Accumula-
tion Time Remaining
15
®
The value of pressure will be displayed during all dive modes when the Display
Module is linked to the Transmitter and within the operating range. Linking
is explained in more detail in the Pre Dive and Dive Mode section.
Depth Displays
During a dive, the Current Depth display, located in the upper/right portion
of the screen (Fig. 16a), indicates depths from 0 to 330 feet (99.5 meters) in 1
foot (.5 meter) increments.
C.Z. C.Z.
NO DECO
0
DECO
PSI
5
10
40
30
20
®
Fig. 16 - Depth Displays
(Alternate Dive Mode)
16
a
O
2
FT
The value of current depth will be displayed during all dive modes unless you
descend deeper than 330 feet (99.5 meters), at which point the display will
show three dashes ( - - - ) to indicate that you have gone 'out of range'. This is
described in detail in the Handling the Extremes section.
A second depth display located in the lower/right portion of the LCD (Fig. 16b)
indicates the Maximum Depth reached during that dive. If the Alternate
Mode is turned 'off', the display will appear when the Select/Right button is
60
50
pressed. More critical information such as a message will override it.
b
In the event that you descend deeper than 330 feet (99.5 meters), this display
will only show three dashes ( - - - ) as the maximum depth for the remainder of
that dive, and as the Max Depth in the Dive Log for that dive. This is described in detail in the Handling the Extremes section.
During a Decompression Dive the required Ceiling Stop Depth appears in
the lower/left portion of the screen (Fig. 17a). The display toggles with the
message CEILING once every 15 seconds while in the Decompression Mode.
This is described in detail in the Handling the Extremes section.
Time Displays
DataTrans Plus
NO DECO
C.Z. C.Z.
DECO
PSI
O
2
FT
R2
The Main Time display, located in the center of the screen (Fig. 18a), has
larger digits than the other numerial displays. Depending on the operating
mode that the DataTrans Plus is in at the time, the display indicates elapsed
Surface Time, theoretical Dive Time Available, Dive Time Remaining, or Total
Ascent Time required.
A second Time display appears in the lower portion of the screen. Depending
on the operating mode that the DataTrans Plus is in at the time, the display
indicates Elapsed Dive Time (Fig. 18b), Decompression Stop Time required,
Time of Day, or Time to Fly.
Each display is described in detail in subsequent sections of this owner's guide.
Most of the time displays are shown in hour:minute format (i.e. 1:02 repre-
sents one hour and two minutes, not 102 minutes!). The colon that separates
hours and minutes blinks once per second when the display is indicating real
time such as elapsed Surface Time. Dive Time Available, No Decompression
5
10
30
0
20
®
60
40
50
b
Fig. 17 - Depth Displays
(Decompression Dive Mode)
a
NO DECO
0
5
C.Z. C.Z.
DECO
PSI
10
30
20
®
O
2
FT
60
40
50
b
Fig. 18 - Time Displays
(Alternate Dive Mode)
17
®
Dive Time Remaining, Total Ascent Time required, or Time to Fly are calculated projections of time and use a solid (non-blinking) colon to indicate that
they are counting down, rather than counting up.
Elapsed Dive Time, that appears in the lower/center portion of the display
(Fig. 19a) when the Alternate Mode is turned 'on', is in minute format with a
maximum display value of 99 minutes. If the Alternate Mode has been turned
'off', Elapsed Dive Time can be displayed by depressing the Select/Right button.
Ambient Temperature Display
NO DECO
0
5
C.Z. C.Z.
DECO
PSI
10
30
20
®
b
O
2
FT
60
40
50
a
Fig. 19 - Alternate Dive Mode
18
When the Alternate Mode is turned 'on', ambient Temperature will appear in
the lower/left portion of the display(Fig. 19b). If the Alternate Mode has been
turned 'off', Temperature can be displayed by depressing the Select/Right button.
NOTE: More critical information such as Ceiling Stop Depth
required or a message will override the lower displays.
Responsible
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