•Always Limit Your Dive to the Level of Your Training
and Experience
•Always Make Your Deepest Dive First
•Always Make The Deepest Part of Every Dive First
•Check Your Computer Often During the Dive
•Do A Safety Stop on Every Dive
•Allow Adequate Surface Interval Between Each Dive
•Allow Adequate Surface Interval Between Each Day of
Diving (12 Hours or Until Your Computer Clears)
Read And Understand This Owner's Guide
Thoroughly Before Using the Pro Plus.
Responsible
Datamax Pro Plus
iii
WARNINGS and SAFETY RECOMMENDATIONS
• The Pro 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 certfication in diving with enriched nitrogen-oxy-
gen (nitrox) mixtures before using the Pro 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 Pro 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 uti-
lize this product.
®
iv
LIMITED TWO-YEAR WARRANTY
For details, refer to the Product Warranty Registration Card provided.
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, No Decom-
pression Time, Decompression Stop Time, Dive Log, Low Battery, Elapsed Dive Time, Maximum Depth, Ascent Rate, and Caution Zone icons are protected by
copyright, and are trademarks of Oceanic.
Datamax Pro Plus Owner's Guide, Doc. No. 12-2141 (5/99)
Oceanic, the Oceanic logo, Datamax Pro Plus, the Pro Plus logo, Oceanglo, Smart Glo, Graphic Diver Interface, Tissue Loading Bar Graph, Pre Dive Planning
Sequence, Variable Ascent Rate Indicator, Set Point, Control Console, Turn Gas Alarm, and OceanLog are all registered and unregistered trademarks of Oce-
anic. 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, Depth Alarm Set Point, Smart Glo, Main Menu Structure, Turn Gas Alarm Set
Point, End Gas Alarm Set Point, Depth Alarm Set Point, Breathing Gas Time Remaining Bar Graph, Data Sensing and Processing Device (U.S. Patent no.
4,882,678), Breathing Gas Time Remaining (U.S. Patent no. 4,586,136), and Variable Ascent Rate Indicator Bar Graph (U.S. Patent no. 5,156,055).
DECOMPRESSION MODEL
The programs within the Pro 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 Pro Plus dive computer model is based upon the latest research and experiments in decompression
theory. Still, using the Pro 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.
R1
Datamax Pro Plus
v
FEATURES and DISPLAYS....................................................................................... 1
• To Set: Alternate On/Off................................................................................................................... 21
• To Set: Audible Alarm On/Off ........................................................................................................... 22
• To Set: Depth Alarm Set Point......................................................................................................... 22
• To Set: Turn Pressure Alarm Set Point............................................................................................ 23
• To Set: End Pressure Alarm Set Point ............................................................................................. 24
• To Set: Date/Hour Format/Time ....................................................................................................... 24
• To Set: Sampling Rate.....................................................................................................................26
• To Set: Units of Measure................................................................................................................. 27
• To Set: FO2 50% Default On/Off......................................................................................................27
EA Mode................................................................................................................................................. 28
Summary of Access to Set Modes .......................................................................................................... 30
PRE DIVE and DIVE MODES.................................................................................. 31
After the First 2 Hours ............................................................................................................................. 50
Downloading Data to PC......................................................................................................................... 50
Summary of Access to Post Dive Modes ................................................................................................ 52
HANDLING THE EXTREMES .................................................................................. 53
Avoiding and Managing Decompression................................................................................................. 54
• Tissue Loading Bar Graph............................................................................................................... 54
• Partial Pressure of Oxygen.............................................................................................................. 63
• High PO2 Dive Mode ....................................................................................................................... 63
• High Oxygen Accumulation.............................................................................................................. 64
Unexpected Loss of Displayed Information............................................................................................ 65
CARE and MAINTENANCE..................................................................................... 69
Care and Cleaning .................................................................................................................................. 70
Annual Inspections and Service .............................................................................................................. 70
• To Obtain Service............................................................................................................................ 71
Service Record....................................................................................................................................... 90
1
Datamax Pro Plus
FEATURES
and
DISPLAYS
refer to page 16 for - WARNINGS and SAFETY RECOMMENDATIONS
2
®
INTRODUCTION
Welcome to Oceanic and thank you for choosing the Pro Plus !
The Pro 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 Pro Plus, information will be expanded upon and some re-
freshed as you proceed. Relax and read through the complete guide.
It is extremely important that you read this owner's guide in se-
quence and understand it completely before attempting to use the
Pro Plus.
Remember that technology is no substitute for common sense, and a dive com-
puter only provides the person using it with data, not the knowledge to use it.
INTERACTIVE CONTROL CONSOLE
The Interactive Control Console, consisting of the Advance (Left) button and
Select (Right) button (Fig. 1), allows you to select various display options and
access specific information when you choose to see it. The buttons can be
pressed repeatedly, or held in to scroll.
Fig. 1 - Interactive
Control Console
SelectAdvance
OCEANIC
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Smart
Glo
NO DECO
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Pro PLUS
DECO
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2
™
®
PSI
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FT
BAR
M
FT
M
2
O
MAX
3
Datamax Pro Plus
20051030405060
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O
INFORMATIONAL DISPLAYS
Operational modes and status information are visually represented numeri-
cally and/or graphically and can be understood at a glance with the aide of uni-
versal icons (Fig. 2) that identify and bring quick focus to the displays. Seg-
mented bar graphs will show how close you are to critical limits.
Each Pro 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 avoid any pos-
sible 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 Pro Plus can
be used for 'air' dives or 'nitrox' dives. For clarity these terms
are defined as -
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.
Fig. 2 - Universal Icons
a. Operating Mode
b. Elapsed Dive Time
c. Deco Stop
d. Temperature
e. Audible
f. Log
g. Maximum Depth
h. Low Battery
a
b
c
d
e
f
g
h
4
®
UNIVERSAL GRAPHIC DIVER INTERFACE
™
Four bar graphs referred to as the Universal Graphic Diver Interface
™
appear
around the perimeter of the screens (Fig. 3). These segmented 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 limit for exposure to oxygen (accumula-
tion), or ascending too fast.
Tissue Loading Bar Graph
™
The Tissue Loading Bar Graph
™
(TLBG) represents nitrogen loading (Fig. 4),
showing your relative no decompression or decompression status. As your
depth and elapsed dive time increase, segments will add to the graph begin-
ning 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 decompres-
sion 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 di-
vided 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
Fig. 3 - Bar Graphs
Fig. 4 - Tissue Loading
Bar Graph
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NO DECO
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DECO
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NO DECO
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5
Datamax Pro Plus
representation of just how close you are to the no decompression limit with a
yellow Caution (C.Z.) Zone that allows you to make a decision regarding safety
stop duration or necessity. The Tissue Loading Bar Graph
™
has been granted
U.S. Patent No. 4,882,687.
The Tissue Loading Bar Graph
™
also assists you with managing decompres-
sion (explained later) by filling a large red 'ceiling stop required' segment.
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. 5) represents oxygen loading,
your relative oxygen tolerance dosage (OTU), showing the maximum of either
per dive accumulated oxygen, or 24 hour period accumulated oxygen. As your
exposure (accumulation of oxygen) increases during the dive, segments will
add to the bar graph starting in the lower right portion of the screen. As oxy-
gen loading decreases, the bar graph will begin to recede, indicating that addi-
tional exposure (accumulation) is allowed for that dive, and 24 hour period.
The O2 bar graph also assists you with managing high partial pressure of oxy-
gen (PO2) by flashing the large red Danger zone segment as a warning when
the level of PO2 exceeds the maximum allowed limit of 1.60 ATA.
Fig. 5 - Oxygen Accumulation
(O2) Bar Graph
NO DECO
C Z
DECO
C ZO
2
6
®
20051030405060
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Variable Ascent Rate Indicator
™
(VARI)
The Variable Ascent Rate Indicator™ (Fig. 6a) is provided to help you avoid
excessive ascent rates by displaying a visual representation of ascent speed,
rather than just showing that you are ascending too fast. The Variable Ascent
Rate Indicator has been granted U.S. Patent no. 5,156,055.
The 5 triangular segments of the bar graph, located beside green, yellow, and
red reference zones, appear beginning from the left and may be considered an
ascent rate speedometer. Green is a 'normal' rate, yellow is a 'caution' rate,
and red is 'Too Fast'.
In the event that 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 5 segments will flash once per second until your ascent speed is slowed.
If this occurs, you should immediately slow your ascent.
Breathing Gas Time Remaining Bar Graph
The Breathing Gas Time Remaining Bar Graph located along the bottom of
the lower display (Fig. 6b) provides a graphic representation of the time that
you can remain at your present depth and then, following a safe ascent, sur-
face with a predetermined breathing gas reserve. This calculation and display
is based on your breathing gas consumption rate that is continually monitored
Fig. 6 - Variable Ascent
Rate Indicator and Breathing
Gas Time Remaining Bar
Graph
Segments = Speed (rate)
0 = 0 - 20 fpm (0 - 6 mpm)
1 = 21 - 30 fpm (6.5 - 9 mpm)
2 = 31 - 40 fpm (9.5 - 12 mpm)
3 = 41 - 50 fpm (12.5 - 15 mpm)
4 = 51 - 60 fpm (15.5 - 18 mpm)
5 = 61+ fpm (18.5+ mpm)
(when 5, all will flash)
a
b
7
Datamax Pro Plus
by the Pro Plus, and it takes into account the breathing gas required for a safe
ascent including any required decompression stops.
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 End 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 Pro Plus is the 'Dive
Time Remaining numeric display'. The Pro Plus constantly monitors three
critical pieces of information; no decompression status, oxygen accumulation
status, and rate of breathing gas consumption. The Dive Time Remaining dis-
play will indicate the time that is more critical for you at that particular mo-
ment (i.e.; whichever time is the least amount available of the three). The spe-
cific time being displayed is identified by the No Decompression Dive Time
icon, or the O2 Time icon, or the Gas Time Remaining icon (Fig. 7). This
unique feature has been granted U.S. Patent No. 4,586,136.
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.
Fig. 7 - Dive Time Remaining
Identification
2
O
(No Decompression Time)
(Oxygen Accumulation Time)
(Breathing Gas Time)
8
®
It is calculated based on the amount of nitrogen absorbed by twelve hypotheti-
cal 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 maxi-
mum level is the controlling compartment for that depth. Its resulting value
will be displayed numerically (Fig. 8a) along with the No Decompression Dive
icon and graphically as the Tissue Loading Bar Graph.
As you ascend from depth following a dive that has approached the no decom-
pression limit, the Tissue Loading Bar Graph will recede 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 Pro Plus
offers.
The no decompression algorithm is based upon Haldane’s theory using maxi-
mum 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.
Oxygen Accumulation Time Remaining
Oxygen accumulation (exposure) during a dive, or 24 hour period, appears
graphically as the Oxygen Accumulation (O2) Bar Graph. As time remaining
Fig. 8 - No Decompression
Dive Time Remaining
NO DECO
C Z
DECO
C ZO
2
FT
FT
MAX
a
9
Datamax Pro Plus
20051030405060
NO DECO
C Z
DECO
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PSI
FT
FT
MAX
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 that depth will be con-
trolled by oxygen. Oxygen Time Remaining will then appear as the main nu-
meric time display (Fig. 9a) as signified by the O
2
Time icon (Fig. 9b) appear-
ing on the display. As oxygen accumulation continues to increase, the O2 bar
graph will enter the yellow Caution Zone (described later).
Breathing Gas Time Remaining
Breathing Gas Time Remaining will appear as the numeric Dive Time Remain-
ing display (Fig. 10) only when it is less than No Decompression Time Remain-
ing and Oxygen Accumulation Time Remaining. Breathing Gas Time Remain-
ing of 60 minutes, or less, will be displayed continuously as the Gas Time Re-
maining Bar Graph (Fig. 10a) 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 Pro Plus calculates Breathing Gas Time Remaining using a patented algo-
rithm 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
Fig. 10 - Breathing Gas Time
Remaining
a
Fig. 9 - O2 Time Remaining
NO DECO
C Z
DECO
C ZO
2
FT
FT
2
O
MAX
a
b
10
®
then used in conjunction with a knowledge of the depth dependence to predict
the breathing gas required for a safe ascent including any required decompres-
sion 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 sud-
denly find yourself swimming against a strong current and begin breathing
more rapidly, the Pro Plus will recognize this change and adjust your Breath-
ing Gas Time Remaining accordingly.
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. There is no reason
to panic, the Pro Plus has allowed for the breathing gas necessary for a safe
ascent including any emergency decompression stops.
R
E
S
P
O
N
S
I
B
L
E
D
I
V
E
R
11
Datamax Pro Plus
ALPHA/NUMERIC DISPLAYS
Cylinder Pressure Display
The Cylinder Pressure display appears in the lower screen (Fig. 11a) any time
the Pro Plus is connected to a pressurized cylinder and in an active mode. Val-
ues of pressure are displayed from 10 PSI (.5 BAR) up to 5000 PSI (352 BAR)
in increments of 10 PSI (.5 BAR).
Depth Displays
During a dive, CurrentDepth (Fig. 11b) and Maximum Depth reached
during that dive (Fig. 11c) are displayed from 0 to 330 feet (99.5 meters) in 1
foot (.5 meter) increments.
During a Decompression Dive, the required Ceiling Stop Depth is displayed
from 60 to 10 feet (20 to 3 meters) in 10 foot (3 meter) increments.
Time Displays
Time displays (Fig. 11 d & e) are shown in hour:minute format (i.e., 1:02 rep-
resents one hour and two minutes, not 102 minutes!). An exception to this is
Decompression Stop Time that displays 0 to 99 minutes (:00 to :99).
Fig. 11 - Pressure/Depth/
Time Displays
20051030405060
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a
c
b
e
d
45
Datamax Pro Plus
To view that Dive's Log (during the Transition Period):
• press the Advance (Left) button 2 times, or -
• press the Advance (Left) button 1 time, if viewing Temp/Date/Time
• the unit will revert to Surface Mode after 2 minutes, if no button is
pressed
Data will not be stored in the unit's memory until the 10 minute Transition
Period is completed.
Once 10 minutes have elapsed, that dive and Transition Period are completed,
and a subsequent descent will be considered a new dive.
AFTER THE TRANSITION PERIOD
For the remainder of the first 2 hours after surfacing, the information de-
scribed above will continue to be displayed as Surface Mode (Fig. 47), and you
will have full access to other modes.
To view the Temperature/Date/Time:
• press the Advance (Left) button 1 time
• During low light conditions, the Smart Glo™ backlight illuminates the dis-
play for button depression time plus 10 seconds.
• the unit will revert to Surface Mode after 10 seconds, if no button is
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