Hollis DG02 User manual

DG02
DIVE COMPUTER
OPERATING MANUAL

2
LIMITED TWO-YEAR WARRANTY
For details, refer to the Product Warranty Registration Card provided.
COPYRIGHT NOTICE
This Operating Manual 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 HOLLIS/2002 Design.
DG02 Operating Manual, Doc. No. 12-4023
© 2002 Design, 2008
San Leandro, CA USA 94577
TRADEMARK NOTICE
HOLLIS, the HOLLIS logo, and DG02 are all registered and unregistered trademarks of HOLLIS. All
rights are reserved.
PATENT NOTICE
U.S. Patents have been issued, or applied for, to protect the following design features:
Dive Time Remaining (U.S. Patent no. 4,586,136), Data Sensing and Processing Device (U.S. Patent
no. 4,882,678), and Ascent Rate Indicator (U.S. Patent no. 5,156,055).
DIVE COMPUTER MODEL
The program within the DG02 simulates the absorption of nitrogen into the body by using a mathemati-
cal model. This model is merely a way to apply a limited set of data to a large range of experiences.
The DG02 dive computer model is based upon the latest research and experiments in decompression
theory. Still, using the DG02, 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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CONTENTS
LIMITED TWO-YEAR WARRANTY ............................................................................................................................ 2
NOTICES ..................................................................................................................................................................... 2
DIVE COMPUTER MODEL ......................................................................................................................................... 2
FULL LCD .................................................................................................................................................................... 6
FEATURESAND DISPLAYS............................................................................................. 7
INTRODUCTION .......................................................................................................................................................... 8
CONTROL BUTTON ................................................................................................................................................... 8
BAR GRAPHS ............................................................................................................................................................. 9
Tissue Loading Bar Graph (TLBG)......................................................................................................................... 9
Oxygen Bar Graph (O2BG) .................................................................................................................................. 10
Variable Ascent Rate Indicator (VARI).................................................................................................................. 10
ALPHA / NUMERIC DISPLAYS................................................................................................................................. 11
Depth Displays...................................................................................................................................................... 11
Time and Date Displays ....................................................................................................................................... 12
Temperature Display............................................................................................................................................. 13
AUDIBLE ALARM ...................................................................................................................................................... 13
BACKLIGHT .............................................................................................................................................................. 14
POWER SUPPLY ...................................................................................................................................................... 14
Battery Indicator ................................................................................................................................................... 14
Low Battery Condition .......................................................................................................................................... 15
FO2 MODE ................................................................................................................................................................ 16
FO2 50% Default .................................................................................................................................................. 17
ACTIVATIONAND SETUP .............................................................................................. 19
ACTIVATION .............................................................................................................................................................. 20
Wet Activation ....................................................................................................................................................... 21
SURFACE SEQUENCE ............................................................................................................................................. 21
SURFACE MODE ...................................................................................................................................................... 21

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CONTENTS (continued)
SET MODE ................................................................................................................................................................ 22
Set Mode Access .................................................................................................................................................. 22
TO SET FO2 ......................................................................................................................................................... 23
PC INTERFACE.................................................................................................................................................... 24
TO SET UNITS OF MEASURE ............................................................................................................................ 25
TO SET HOUR FORMAT ..................................................................................................................................... 25
TO SET TIME ....................................................................................................................................................... 26
TO SET DATE ...................................................................................................................................................... 27
TO SET PO2 ALARM ........................................................................................................................................... 28
TO SET FO2 50% DEFAULT ............................................................................................................................... 28
TO SET DIGITAL GAUGE MODE ........................................................................................................................ 29
TO SET WATER ACTIVATION ............................................................................................................................. 29
TO SET DEEP STOP ........................................................................................................................................... 30
PLANAND DIVE MODES ............................................................................................... 31
PRE DIVE PLANNING SEQUENCETM ...................................................................................................................... 32
TISSUE LOADING BAR GRAPH .............................................................................................................................. 34
OXYGEN ACCUMULATION BAR GRAPH ............................................................................................................... 34
VARIABLE ASCENT RATE INDICATOR .................................................................................................................. 34
CONTROL OF DISPLAYS ......................................................................................................................................... 35
NO DECOMPRESSION DIVE MODE ....................................................................................................................... 35
No Deco Deep Stop .............................................................................................................................................. 37
No Deco Safety Stop ............................................................................................................................................ 38
DECOMPRESSION DIVE MODE .............................................................................................................................. 39
VIOLATION MODES .................................................................................................................................................. 41
Conditional Violation Mode ................................................................................................................................... 42
Delayed Violation Modes ...................................................................................................................................... 42
Violation Gauge Mode .......................................................................................................................................... 44
HIGH PO2 .................................................................................................................................................................. 45
HIGH O2 .................................................................................................................................................................... 46
DIGITAL GAUGE MODE ........................................................................................................................................... 47

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CONTENTS (continued)
POST DIVE MODES ....................................................................................................... 49
POST DIVE SURFACE MODE .................................................................................................................................. 50
TRANSITION PERIOD .............................................................................................................................................. 50
AFTER THE TRANSITION PERIOD (THE FIRST 2 HOURS) .................................................................................. 51
Time to Fly/Desaturate ......................................................................................................................................... 51
Pre Dive Planning Sequence ............................................................................................................................... 52
Log Mode .............................................................................................................................................................. 53
AFTER THE FIRST 2 HOURS .................................................................................................................................. 55
WET CONTACTS ....................................................................................................................................................... 55
DOWNLOADING DATA TO A PC .............................................................................................................................. 56
GENERAL ....................................................................................................................... 57
CARE AND CLEANING ............................................................................................................................................. 58
INSPECTIONS AND SERVICE ................................................................................................................................. 59
MODULE REMOVAL FROM A BOOT ...................................................................................................................... 60
BATTERY REPLACEMENT ...................................................................................................................................... 60
RETURNING A MODULE TO A BOOT ..................................................................................................................... 64
RESET FEATURE...................................................................................................................................................... 65
ALTITUDE COMPENSATION.................................................................................................................................... 66
SPECIFICATIONS ..................................................................................................................................................... 67
SERVICE RECORD ................................................................................................................................................... 75
Pay special attention to items marked with this Warning symbol.

6LCD DISPLAY
Components:
a. Icon - Operating Mode
b. Icon - Battery Status
c. O2 Bar Graph
d. Icon - Time
e. Ascent Rate Indicator
f. Icon - Ascent Too Fast
g. Icon - Depth
h. Icon - Dive No.
i. Icon - Log Mode
j. Icon - Max Depth
k. Icon - Temperature
l. Tissue Loading Bar Graph
m. Icon - Alarm Set
n. Icon - Maximum Depth
o. Icon - Descend Arrow
Icon - Deco Ceiling Stop Bar
Icon - Ascend Arrow
a
b
c
d
e
f
g
h
i
j
k
l
m
n
o

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FEATURES and DISPLAYS

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Be a - RESPONSIBLE DIVER at all times.
INTRODUCTION
Welcome to HOLLIS and thank you for choosing the DG02 !
It is extremely important that you read this Operating Manual in sequence and
understand it completely before attempting to use the DG02.
Remember that 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.

CONTROL BUTTON
The Control Button allows you to select display options and
access specific information when you want to see it. It is also
used to enter settings and activate the Backlight.
BARGRAPHS
Tissue Loading Bar Graph (TLBG)
The TLBG (Fig. 1a) represents tissue loading of nitrogen, show-
ing your relative no decompression or decompression status. As
your depth and elapsed dive time increase, segments will add to
the TLBG, and as you ascend to shallower depths, the segments
will begin to recede, indicating that additional no decompres-
sion time is allowed for multilevel diving.
The TLBG represents 12 different nitrogen compartments simulta-
neously and displays the one that is in control of your dive. It is
divided into a green No Decompression (normal) zone, a yellow
Caution zone (also No Decompression), and a red Decompres-
sion (danger) zone.
While you cannot provide a guarantee against the occurrence of
decompression sickness, you may choose your own personal
zone of caution based upon age, physique, excessive weight,
etc.,toreducethestatisticalrisk.
Fig. 1 - TLBG
a

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Oxygen Accumulation Bar Graph (O2BG)
The O2BG (Fig. 2a) represents oxygen loading, showing the
maximum of either per dive or 24 hour accumulated oxygen.
As your oxygen exposure (accumulation) increases during the
dive, segments will add to the O2BG, and as loading de-
creases, it will begin to recede, indicating that additional
exposure is allowed for that dive and 24 hour period.
NOTE: Displays associated with oxygen and the
O2BG will only appear if FO2 has been set at a value
other than 'Air' (e.g., a numerical value).
Variable Ascent Rate Indicator (VARI)
The VARI (Fig. 2b) provides a visual representation of ascent
speed (i.e., an ascent speedometer). Green is a 'normal' rate,
yellow a 'caution' rate, and red is 'Too Fast'.
The segments of the VARI represent two sets of speeds which
change at a reference depth of 60 FT (18 M). Refer to the
chart for segment values.
WARNING: At depths greater than 60 FT (18 M),
ascent rates should not exceed 60 FPM (18 MPM).
At depths of 60 FT (18 M) and shallower, ascent
rates should not exceed 30 FPM (9 MPM).
Fig. 2 - O2BG and VARI
VARI
Deeper than 60 FT (18 M)
Segments Ascent Rate =
Displayed FPM MPM
0 0-20 0 - 6
1 21-50 6.5-15
2 51-60 15.5-18
3 >60 >18
60 FT (18 M) & Shallower
Segments Ascent Rate =
Displayed FPM MPM
0 0-10 0 - 3
1 11-25 3.5-7.5
2 26-30 8-9
3 >30 >9
a
b

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ALPHA / NUMERIC DISPLAYS
Each 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 possible mis-
understanding that could result in error.
Depth Displays
During a dive, the Current Depth will be displayed on the
Main screen with the FT (or M) icon (Fig. 3a) in 1 FT (0.1 M)
increments.
The Max Depth reached during that dive will also be dis-
played with the MAX icon (Fig. 3b).
• When set to operate as a digital depth gauge/timer (re-
ferred to as User Set Gauge Mode), the Depth Display range
is extended to 399 FT (120 M). At depths greater than 99.9
M it will indicate metric values in increments of 1 M.
When Deep, Safety, or Deco Stops are activated, the Stop
Depth is displayed on the Main screen (Fig. 4a) in place of
Max Depth which can then be viewed on an alternate display
accessed by pressing the button.
Fig. 4 - Stop Depth
a
a
Fig. 3 - Depths
b

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Time and Date Displays
Time displays are shown in hour:minute format (i.e., 1:16
represents 1 hour and 16 minutes, not 116 minutes!). The colon
that separates hours and minutes blinks once per second when
the display is indicating real time (e.g., Elapsed Dive Time), and
is solid (non-blinking) when times are calculated projections
(e.g.,Time to Fly).
The Main Time display is located in the lower portion of the
display (Fig. 5a) and a second time display (Fig. 5b) is
located in the center/right. Both displays are identified by a
clock icon.
• Time of Day can be set for 12 hour format (Am/Pm) or 24
hour format.
Date (Month and Day) is displayed in the center/left portion of
the screen (Fig. 6a) only to identify dive data while it is viewed
in the Log Mode. Year is only displayed when setting the Date.
• When Units of Measure are set for 'Imperial', the Month
appears to the left of Day. When set for Metric, the Month
appears to the right of Day.
Fig. 5 - Times
Fig. 6 - Date
a
b
a

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Temperature Display
Ambient Temperature is displayed in the center/left portion
of the screen (Fig. 7a) while in the Surface Mode and Log
Mode, and can be viewed as part of an Alternate Display when
the button is pressed while in a dive mode.
NOTE: The Informational Displays are described in
detail as the various operating modes they appear in
are presented throughout this manual.
AUDIBLEALARM
When warning situations activate the Alarm, the unit will emit a beeping tone for 10
seconds. The Alarm will sound again upon reentry into the warning situation, or entry into
another type of warning situation. A red LED Warning Light is synchronized with the
Audible Alarm and will flash when the Alarm emits a tone.
Situations that will activate the Alarm include -
• Entry into Decompression
• PO2 => than the PO2 AlarmSet Point.
• Depth => 330 FT/99.9 M.
• O2 => 100% (300 OTU).
• Ascending above a required Deco Stop Depth.
• Ascent rate exceeds the allowed limit.
• Deco requires a Stop Depth => 70 FT/21 M.
• Being on the surface for 5 minutes after a Conditional Violation (Permanent Violation).
Fig. 7 - Temperature Display
a

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BACKLIGHT
To activate the Backlight while on the surface, press and release
the button momentarily (< 2 sec).
• Press/release the button again to activate as desired.
• The Backlight does not operate during a Low Battery condi-
tion.
During a dive depress the button for 2 seconds
• Depress the button again to activate as desired.
POWER SUPPLY
The DG02 utilizes one (1) type CR 2450 Lithium 3 volt cell that
should provide 300 hours of continuous, or 50 activation peri-
ods, of operation. If you conduct 1 dive each time the unit is
activated, you should obtain approximately 50 dives. If you
conduct 3 dives each time the unit is activated, you should
obtain approximately 150 dives.
Battery Indication
A Battery icon provides an indication of battery condition.
When power is sufficient for normal unit operation, the icon will
be displayed during Surface Mode (Fig. 8a). The icon will not
be displayed during any Dive Mode(s).
Fig. 8 - Battery Indicator
a

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Low Battery Condition
Voltage is checked upon activation and every (1) minute during
operation on the surface.
• When 75 % of the rated power has been consumed, the
lower bar of the Battery icon (only segment) will be dis-
played, and the shell of the icon will flash once per second
(Fig. 9) as a warning that the Battery is to be replaced prior
to conducting any further dives.
• Upon decreasing to a voltage level that will no longer
sustain proper operation (2.50 v), the icon will flash 5 times
followed by shutdown of the unit.
• If a Low Battery Condition exists when the unit is activated
by pressing the button, the graphic bAT and the Battery icon
will appear flashing for 5 seconds followed by shutdown of
theunit.
• If the button is not pressed to activate the unit prior to a dive,
and a Low Battery Condition exists, the Battery icon will
appear flashing as a warning upon descent to 5 FT (1.5 M).
No other information will be displayed.
• If the unit did not display a Low Battery Condition prior to
entering Dive Mode, and a Low Battery Condition occurs
during the dive, there will be sufficient battery power to
maintain unit operation for the remainder of 'that dive'. The
Battery icon will appear after the dive in Surface Mode.
Fig. 9 -Low Battery Condition

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FO2 MODE
After Activation, the DG02 will operate as an Air computer
without displaying information associated with O2 calculations,
unless it is set for a percentage of O2 (FO2) other than Air (a
numerical value between 21 and 50 %).
When set with an FO2 value of 'Air' (Fig. 10), the DG02 will
perform calculations the same as if FO2 were set for 21% O2,
internally accounting for O2 for any subsequent Nitrox dives.
However, O2 related displays, warnings, and the O2BG will not
appear on the display for that dive, or subsequent dives, unless
FO2 is set for a numerical value (21 to 50).
Once a dive is made with the unit set as a Nitrox computer (FO2
set for a numerical value), it cannot be programmed to operate
as an 'Air' computer until 24 hours after the last dive. 'Air' will
not be displayed as an option in the FO2 Set Mode, however,
you can set FO2 for 21% for use with Air.
When FO2 is set at a value of 21% (Fig. 11), the unit will
remain set at 21% for subsequent nitrox dives until FO2 is set to
a higher value, or until it automatically turns off and is reacti-
vated. Setting FO2 is described on Page 23.
Fig. 10 - FO2 set for Air
Fig. 11 - FO2 set for 21%

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Fig. 12 - FO2 Default ON
Fig. 13 - FO2 Default OFF
FO2 50% Default
If the Default feature is set to ON (Fig. 12) and FO2 is set to a
value 'greater than 21%', the FO2 Set Point value will auto-
matically revert to 50% 10 minutes after that dive. The Max
Depth that can be achieved with a PO2 of 1.60 ATA will also
be displayed.
• FO2 must therefore be reset for each repetitive Nitrox
dive, or the value will automatically default to 50% and
the dives will be calculated based on 50% O2 (50%
nitrogen) for oxygen calculations and 21% O2 (79%
nitrogen) for nitrogen calculations.
If the Default feature is set to OFF (Fig. 13), the FO2 value for
repetitive dives remains the same as previously set until the
FO2 Set Point is manually changed.

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SET MENU
While the SURFACE SEQUENCE is scrolling >>
press button 2 seconds each time to access >>
• SET FO2
• PC (view only)
• SET UNITS
• SET HOUR FORMAT
• SET TIME
• SET DATE
• SET PO2 ALARM
• SET FO2 50% DEFAULT
• SET DIGITAL GAUGE MODE
• SET WET ACTIVATION
• SET DEEP STOP

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ACTIVATION and SETUP

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ACTIVATION
To Activate the DG02, press and release the Button.
• Upon manual activation, the unit will enter Diagnostic Mode
(Fig. 14), displaying all segments of the LCD as 8's, followed
by dashes (- -), then a countdown from 9 to 0. Diagnostic
Mode checks the display and Battery voltage to ensure that
everything is within tolerance and functioning properly.
• When the button is held depressed when the Diagnostic
countdown reaches 00, an External Access request is initi-
ated. A Serial Number screen appears displaying the unit’s
Serial Number and firmware code Revision Number as long
as the button is held depressed (Fig. 15). Upon releasing the
button, the unit shuts Off. This information will be required if
the unit ever requires factory or warranty service
• After manual activation, it will also check the ambient
barometric pressure, and calibrate its present depth as zero.
At elevations of 3,000 feet (915 meters) or higher, it will
adjust (reduce) No Deco Limits and recalibrate itself to
measure depth in feet of fresh water instead of feet of sea
water.
WARNING: If the unit is activated at elevations
higher than 14,000 feet (4,267 meters), it will perform
a diagnostic check and immediately shutdown.
Fig. 14 - Diagnostic Mode
Fig. 15 - Serial Number