SubGear XP-H User manual

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XP-H

2
! WARNING
You must carefully read and understand this entire manual before using your SUBGEAR XP-H.
Diving has many inherent risks. Even if you follow the instructions of this manual in a careful
manner, it is still possible that you may be seriously injured or die from decompression sickness,
oxygen toxicity or some other inherent risk of scuba with Nitrox or compressed air. Unless you are
fully aware of these risks and are willing to personally accept and assume responsibility for those
risks, do not use SUBGEAR XP-H.
Guidelines for the use of XP-H
The following guidelines for using XP-H are derived from the latest medical research and the
recommendations of the American Academy of Underwater Sciences for diving with diving
computers. Following these guidelines will greatly increase your safety while diving, but cannot
guarantee that decompression sickness or oxygen toxicity will not occur.
• XP-H is designed for dives with compressed air (21% O2) and Nitrox (22 to 50% O2) only. Do not
use XP-H for dives made with other mixed gases.
• It is absolutely necessary to check the set mixture before each dive and to compare it to the
gas mixture currently used. Always remember: setting an incorrect mixture carries an inherent
risk of decompression sickness and/or oxygen toxicity! Maximum deviation from the measured
mixture must not exceed 1% O2. An incorrect gas mixture can be lethal!
• Only use XP-H with open circuit breathing systems.
• Only use XP-H for diving with an independent breathing apparatus. XP-H is not designed for
long term exposures with Nitrox.
• Always observe the visual and audible alarm signals. Avoid situations of increased risk which
are marked with a warning sign in this operating manual.
• XP-H has a ppO2 warning. The default limit is set at 1.4bar ppO2 max. It can be changed
between 1.2 and 1.6bar.
• Frequently check the "oxygen clock" (CNS O2). Ascend and finish the dive if the CNS O2 exceeds 75%.
• Never dive deeper than the Maximum Operating Depth (MOD) pertinent to the gas mixture in use.
• Always check the diving limits considering the oxygen content and standard sports diving
procedures (decompression sickness, oxygen toxicity).
• In accordance with the recommended maximum diving limit of all instructional agencies, do not
dive deeper than 40 metres/130 feet.
• The danger of nitrogen narcosis has to be taken into consideration. XP-H gives no warning
about this.
• On all dives, with or without dive computer, make a safety stop for at least 3 minutes at 5 metres
(15 feet).
• All divers using dive computers to plan dives and indicate or determine decompression status
must use their own computer, which they take with them on all dives.
• If XP-H fails at any time during the dive, the dive must be terminated, and appropriate surfacing
procedures (including a slow ascent and a 3 to 5 minute safety stop at 5m /15ft) should be
initiated immediately.
• Comply with the ascent rate and carry out any decompression stop required. If the computer
should fail for any reason, you must ascend at a rate of 10m / 30ft per minute or less.
• On any given dive, both divers in a buddy pair must follow the most conservative dive computer
for that particular dive.
• Never dive without a buddy. XP-H does not substitute for a dive buddy.
• Only make dives that are appropriate to your level of dive training. XP-H does not increase your
knowledge of diving.
Safety considerations
I Safety considerations

3
English
Safety considerations
• Always dive with back-up instruments. Make sure that you always use back-up instrumentation
including a depth gauge, submersible pressure gauge, digital bottom timer or dive watch, and
have access to decompression tables whenever diving with a dive computer.
• Avoid repeated ascents and descents (yo yo diving).
• Avoid repeated heavy workload while at depth.
• Plan the dives to be shorter if they are made in cold water.
• After finishing the decompression or at the end of a no-stop dive, the final stage of the ascent
should be as slow as possible.
• You MUST be familiar with all signs and symptoms of decompression sickness before using XP-H!
Seek IMMEDIATE treatment for decompression sickness should any of these signs or symptoms
occur after a dive! There is a direct correlation between the effectiveness of treatment and the delay
between the onset of symptoms and the treatment for decompression sickness.
• Only dive with Nitrox after you have been thoroughly instructed by a recognised institution.
Repetitive dives
• Do not start your next dive before your CNS O2% status has dropped below 40%.
• When diving with Nitrox, make sure your surface interval is long enough (just like diving with
compressed air). Plan for a minimum surface interval of two hours. Oxygen, too, needs sufficient
time to leave the body.
• Match gas mixture to the intended dive.
• Do not attempt a repetitive dive if the no-dive warning is visible on the display.
• Plan a day without diving once a week.
• If you have to change computers, wait at least 48 hours before carrying out your next dive.
• Diving after a reset of the remaining saturation (reset, see page 48, or battery replacement, see
page 52) may lead you into potentially hazardous situations which could result in death or serious
injury. After a reset of the remaining saturation do not dive for at least 48 hours.
Altitude and diving
• Do not dive at altitudes higher than 4000m (13000ft).
• After a dive do not rise to altitudes that XP-H prohibits via the flashing altitude range number
(see page 27).
Flying after diving
• After diving, wait at least 24 hours prior to flying.
XP-H dive instrument is a personal protective equipment in compliance with the essential safety
requirements of the European Union directive 89/686/EEC. RINA SpA, Via Corsica 12, I-16128 Genoa,
notified body no. 0474, have certified the conformity with the European Standard EN 13319:2000.
EN 250:2000 Respiratory equipment - Open circuit self contained compressed air diving apparatus -
Requirements, testing, marking (pressure gauge test).
EN13319:2000 Diving accessories - Depth gauges and combined depth and time measuring devices -
Functional and safety requirements, test methods. Any information on decompression obligation
displayed by equipment covered by this standard is explicitly excluded from its scope.

4
Introduction
Congratulations on purchasing XP-H and welcome to SUBGEAR. From now on you will enjoy the
assistance of an extraordinary dive computer - equipped with SUBGEAR innovative technology - while
diving.
We thank you for choosing XP-H and we hope you will enjoy safe dives in the future! Further information
on SUBGEAR and SUBGEAR products can be found on our web page at www.subgear.com.
To make this manual easier to read we will use the term " XP-H " as an abbreviation for "SUBGEAR XP-H
diving computer" throughout this booklet.
Safety considerations
Dive computers provide divers with data; they, however, do not provide the knowledge about how this
data should be understood and applied. Dive computers cannot replace common sense! You must
therefore carefully read and understand this entire manual before using your XP-H.
Important remarks concerning signal words and symbols
This operating manual makes use of the following icons to indicate especially important comments:
F Remarks Information and tips which are important for optimal use of the functions of
XP-H.
!
Danger! Indicates a potentially hazardous situation which, if not avoided, could result
in death or serious injury.
The following symbols are used in the operating manual:
Flashing display -> Page reference e.g. ->6
Audible signals
Audible attention signal
4s Audible alarm signal
Introduction
Instructions for manual input
Press left push button
Press and hold (1 second)
left push button
Press and hold (1 second)
both push buttons
Press right push
button
Press and hold
(1 second)
right push button
Alternate displays
By pushing during the dive you can scroll
through alternate displays.
How to get back to the first display:
• scrolling with through the displays
• after 5 seconds: automatically if marked with
• after 5 seconds: directly by pushing 1x
E.g. Max depth > Temperature >
Temperature, Time > Max depth
Time out after 5 seconds without operation.
Display switches back to original indication.

5
English
Quick reference
Time of day / Date
Decompression depth
Desaturation time (DESAT)
Duration of no-dive warning
Duration of surface interval
Current depth
Do not fly icon
No-dive warning
Battery icon
No-stop indicator
Ascent time icon
No-stop time / Total ascent time
Partial pressure of oxygen ppO2
Alarm clock icon / Infrared icon
Nitrogen loading bar (dive)
Residual Nitrogen bar (surface)
Desaturation
Battery condition
O2 mix
Oxygen toxicity CNS O2%
Ascent rate
Too fast
ascent
Gauge icon
Dive time / No-fly time /
SOS duration
Repetitive dive number
Altitude sections
Log Book
Decompression stop
obligation / Ignored
decompression stop
Decompression stop
indicator
Decompression stop duration
O2 mix icon (input)
Setting icon
Service icon
Tank pressure
Max depth
Maximum Operating Depth (MOD)
Dive number
Icon for safety stop timer
AMPM AM/PM icon
DESAT Desaturation icon
Operating scheme
"->" means "more information at page"
//
Enter
/ Scroll / Change setting
Backlight
Exit
Off
Time of day display
• (Desat. time CNS O2% ) ->14
• Date ->14
• Battery condition ->14
• Depth alarm -> 45
• Dive time alarm -> 46
• Safety stop time -> 46
• ppO2 max -> 46
•
Tank pressure alarms -> 46
• Reset to air -> 46
• PDIS -> 46
• Unit system -> 46
• Unit system, tank -> 47
• Salt water -> 47
• Light time -> 47
• Attention beep -> 47
• Water contacts -> 47
• Reset desaturation -> 48
• Alarm clock ->48
• UTC time zone ->49
• Time of day ->49
• Date ->49
• 24h / AM PM ->49
• LCD contrast ->49
• IrDA speed ->50
• Sound on / off ->50
• Electronic ID ->50
Set 1
->45
Logbook
->43
Dive
planner
->42
Without operation the display switches automatically back to the time of day display and after 3 minutes
the display switches off. See also page 13.
Quick reference
O2 mix /
ppO2 max
->20
MB level
->31
Gauge
mode
->29
Altitude
meter
-> 27
Set 2
->48
MB level symbol
PDIS icon

6
Operating scheme
Display switched off
O2 mix Logbook Diveplanner (PLn)
Oxygen
concentration
ppO2 max
(MOD)
Confirmation
Page 1
Page 2
Page 4
Max depth
No-stop dive
Altitude range
(if >0)
Deepest
dive
Number
of dives
Longest
dive
Cumulative
bottom time
SOS
if applicable Surface interval
if applicable
Exit
After the oldest dive:
Statistic information
Date of
the dive
Minimum
temperature
Dive
number
Dive time Surface
interval
No-stop time
Depth
Exit
Repetitive
divenumber
Starting time
CNS O2% at
the end
Battery
performance
O2 mix.
Page 3

7
English
List of chapters
I Safety considerations ................................................................................................................2
Introduction ................................................................................................................................4
Important remarks concerning signal words and symbols .................................................. 4
Quick reference/Operating scheme ........................................................................................ 5
List of chapters ..........................................................................................................................7
II System and operation ...............................................................................................................9
1 System description ...................................................................................................................... 9
2 Operation ..................................................................................................................................... 9
2.1 Push buttons .................................................................................................................... 9
2.2 Water contacts ............................................................................................................... 10
2.3 Dive.Log dedicated software application ........................................................................ 10
Configuring XP-H ..................................................................................................................... 10
2.4 Switching on the display ................................................................................................. 13
2.5 How to navigate XP-H at the surface .............................................................................. 13
2.6 Checking the desaturation time ...................................................................................... 14
2.7 Checking the surface interval ......................................................................................... 14
2.8 Displaying the date ........................................................................................................ 14
2.9 Checking the battery condition ....................................................................................... 14
2.10 Active backlight .............................................................................................................. 15
2.11 Switching off the display ................................................................................................. 16
2.12 Alarm clock .................................................................................................................... 16
3 SOS mode ................................................................................................................................. 16
III Diving with XP-H ......................................................................................................................17
1 Terminology / Symbols ............................................................................................................... 17
1.1 General terminology / Display during no-stop phase ...................................................... 17
1.2 Display during decompression phase ............................................................................. 17
1.3 Nitrox information (O2 information) .................................................................................. 18
2 Attention messages and alarms ................................................................................................. 19
2.1 Attention messages ........................................................................................................ 19
2.2 Alarms ............................................................................................................................ 19
3 Preparation for the dive .............................................................................................................. 20
3.1 Setting the gas mixture and ppO2 max .......................................................................... 20
3.2 Preparation for the dive and function check .................................................................... 20
4 Functions during the dive ........................................................................................................... 21
4.1 Immersion ....................................................................................................................... 21
4.2 Dive time ....................................................................................................................... 21
4.3 Current depth / O2% mix ................................................................................................ 21
4.4 Tank pressure / Maximum depth / Temperature .............................................................. 21
4.5 Ascent rate ..................................................................................................................... 22
4.6 Partial pressure of oxygen (ppO2 max) / Maximum Operating Depth (MOD) .................... 23
4.7 Oxygen toxicity (CNS O2%) ............................................................................................. 23
4.8 Nitrogen loading bar graph ............................................................................................. 24
4.9 Decompression information ............................................................................................ 24
4.10 Safety stop timer ............................................................................................................ 25
5 Functions at the surface ............................................................................................................. 26
5.1 End of a dive .................................................................................................................. 26
5.2 Residual nitrogen bar graph ............................................................................................ 26
5.3 Desaturation time, No-fly time and No-dive warning ....................................................... 26
6 Diving in mountain lakes ............................................................................................................. 27
6.1 Altitude ranges ............................................................................................................... 27
6.2 Prohibited altitude ........................................................................................................... 28
6.3 Decompression dives in mountain lakes ......................................................................... 28

8
List of chapters
7 Gauge Mode .............................................................................................................................. 29
8 Diving with microbubble (MB) levels ........................................................................................... 31
8.1 Comparison of dives with MB level L0 and MB level L5 .................................................. 32
8.2 Terminology .................................................................................................................... 32
8.3 Preparation for a dive with MB levels .............................................................................. 33
8.4 Functions during the dive with MB levels ........................................................................ 34
8.5 Complete a dive with MB levels ...................................................................................... 37
9 PDIS (Profile Dependent Intermediate Stop) ............................................................................... 38
9.1 Introduction to PDIS (Profile-Dependent Intermediate Stop) ............................................ 38
9.2 How does PDIS work? ................................................................................................... 39
9.3 Diving with PDIS ............................................................................................................. 40
IV Dive planner ............................................................................................................................. 42
1 Planning a no-stop dive ............................................................................................................. 42
2 Leaving the dive planner ............................................................................................................ 42
V Logbook ................................................................................................................................... 43
1 Survey ........................................................................................................................................ 43
2 Operation ................................................................................................................................... 43
VI Settings .................................................................................................................................... 45
1 Menu "set 1" .............................................................................................................................. 45
2 Menu "set 2" .............................................................................................................................. 48
VII Appendix .................................................................................................................................. 51
1 Technical information ................................................................................................................. 51
2 Maintenance .............................................................................................................................. 51
2.1 Connecting the high pressure hose ................................................................................ 52
2.2 Replacing the battery ...................................................................................................... 52
3 Warranty .................................................................................................................................... 54
4 Index .......................................................................................................................................... 55

9
English
II System and operation
II System and operation
1 System description
XP-H displays all important dive and decompression data and has a memory which stores the full dive
data. The data can be transmitted with an infrared interface (IrDA) and Dive.Log software to a Windows®
personal computer.
Dive.Log software CD is included with the XP-H package. Infrared interfaces are available in PC.
Infrared port
SUBGEAR
XP-H
Dive.Log
Infrared Interface
(option)
2 Operation
F On page 5 and 13 you will find an operating schematic.
2.1 Push buttons
XP-H can be operated with two push buttons ( ). Operation of the push buttons is divided into
"press" ( / ) and "press and hold (1 second)" ( / ).
At the surface:
/ • Switch on XP-H (time of day display)
• Comparable to the ENTER or RETURN key of a
keyboard
• Enter into the displayed sub menu
• Open the displayed setting
• Confirm or enter the displayed value or setting
/ • Scroll through a menu
/ • Once entered with into a sub menu or setting:
- Increase ( ) or decrease ( ) the indicated value
- Change the setting
• Switch on the backlight
• Exit the current function or menu and switch to the
time of day display
• Switch off XP-H
Under water:
• Access alternate displays
• Switch on the backlight
• Activate the safety stop timer
(dive mode only, in depths < 6.5m / 21ft)
Push buttons
Water contacts
(one located in front
and one on back,
however, inaccessible)

10
2.2 Water contacts
On submerging in water the water contacts switch on XP-H automatically.
! WARNING
If you have chosen the option "Water contacts off" ("set 1", ->47), XP-H will turn on with a delay of
up to 1 minute into the dive. This will affect functioning of the computer.
Make sure that the computer is on before starting the dive.
2.3 Dive.Log dedicated software application
With Dive.Log you can configure XP-H, transfer dive data to a personal computer and graphically
display the data. To start the communication, turn on XP-H and place it so that its infrared port is in
front of the infrared interface. If XP-H detects an infrared device within range appears.
Configuring XP-H
To configure XP-H, select "Dive Computer Settings" under "OPTIONS" on the main menu bar of
Dive.Log after having established communication between your PC and XP-H. The following window
will appear:
When making any changes to the settings via Dive.Log, you must press the "Write" icon for the changes
to take effect.
Operation

11
English
Operation
The following settings may be changed with Dive.Log or via " set 1 " or " set 2 " directly on XP-H :
Setting Range Default Page
• Depth alarm
• Dive time alarm
• Safety stop time
• Tank pressure warning and alarm
• PDIS
• Tank pressure unit
• Salt water
• Backlight duration
• Maximum partial pressure of oxygen
(ppO2 max)
• Time limit to reset the O2% mix to air
• Unit system
• Audible attention signals
• Water contacts
• Reset desaturation
• Alarm clock
• UTC (Universal Time Change) zone
• Time of day
• 24 or AM/PM setting
• Date
• Display contrast
• Sound
5-100m / 15-330ft
5-195 min
off, 1-5 min
warning 50-200bar/750-3000psi
alarm 20-120bar / 300-1750psi
on / off
bar / psi
on / off
2-12s / push on/off
1.2-1.6bar
no reset / 1 - 48hrs
metric/imperial
on / off (Dive.Log: selective)
on / off
on / off
0 - 23h 59min, on/off
±13hrs, increments: 15min
hours:minutes
24 (off) / AM/PM (on)
1 (low) -12 (high)
on / off
40m/130ft
60min
3min
100bar/1450psi
40bar/600psi
off
bar
on
6s
1.4bar
no reset
on
on
no reset
12:00, off
4
on
45
46
46
46
46
47
47
47
46
46
46
47
47
48
48
49
49
49
49
49
50
The following data may be recalled with Dive.Log:
• Number of past dives • Dive profile
• Total duration of dives • Logbook
• Deepest dive • Temperature curve
• Longest dive • Alarms and attention messages
• Atmospheric pressure • Battery condition
• Tank pressure at beginning and end of the dive
Downloading your dives
XP-H’s memory allows you to store approximately 15 hours of dive profile
information in 4 second sampling intervals. With Dive.Log you can transfer
this information to the PC in order to visualize and analyze your dives on the
monitor. To download data from XP-H, click on "NEW" under the
"LOGBOOK" menu to open and name a new logbook or open an existing
logbook. Then click on the "TRANSFER DIVES" icon: a box will appear on
the screen identifying the computer being downloaded, and a progress bar
will show the status of the transfer.
You can choose between transferring all dives or new dives only (default
setting) from XP-H’s memory. If you choose to transfer new dives only,
Dive.Log will only transfer dives that are more recent than the most recent dive already saved in the
PC logbook. To transfer all dives, you must change the default setting by selecting "Transfer" under
"Dives" in the main menu bar.
Once the data is downloaded, a window will show you a summary table of all dives; for the selected
dive, another window will show you its details. From these windows you can add and edit your dive
information.

12
Operation
Dive window
Dive information
panel
Dive profile
panel
Alarm
symbols
Notes panel
Dive computer
display
Tissue panel
Physiology
panel
Dive table

13
English
Operation
2.4 Switching on the display
• Automatically, on submerging in water* or when adaptation to atmospheric
pressure is necessary;
• Manually, by pushing or . If switched on with all segments
light up for 5 seconds.
Afterwards the display shows the time of the day, the O2 mix and the
temperature.
F This display is called time of day display. Most navigation descrip-
tions start from this display. At the surface XP-H returns automati-
cally to this display.
If there is a remaining saturation from the last dive or from a change of altitude,
XP-H also displays the "do not fly" time, the "do not fly" icon, the current
altitude range and the prohibited altitude range (->27).
F When XP-H is in state of rest no information is displayed but the
atmospheric pressure is continuously monitored. If a change in
altitude range is detected, XP-H switches on for 3 minutes automati-
cally ->27.
* Only if the option " Water contacts on " ( " set 1 " , ->47) is chosen. See warning ->10.
2.5 How to navigate XP-H at the surface
Starting from the time of day display you can enter into different menus.
//
• Enter with into the
function or sub menu.
• With you can switch
to the time of day display.
• After 3 minutes without
operation XP-H returns to
the time of day display.
Off
Time of day display
• (Desat. time CNS O2% ) ->14
• Date ->14
• Battery condition ->14
• Depth alarm -> 45
• Dive time alarm -> 46
• Safety stop time -> 46
• ppO2 max -> 46
• Tank pressure alarms -> 46
• Reset to air -> 46
• PDIS -> 46
• Unit system -> 46
• Unit system, tank -> 47
• Salt water -> 47
• Light time -> 47
• Attention beep -> 47
• Water contacts -> 47
• Reset desaturation -> 48
• Alarm clock ->48
• UTC time zone ->49
• Time of day ->49
• Date ->49
• 24h / AM PM ->49
• LCD contrast ->49
• IrDA speed ->50
• Sound on / off ->50
• Electronic ID ->50
Set 1
->45
Logbook
->43
Dive
planner
->42
Time of day display
O2 mix /
ppO2 max
->20
MB level
->31
Gauge
mode
->29
Altitude
meter
-> 27
Set 2
->48

14
Operation
2.6 Checking the desaturation time
From the time of day display you can check the desaturation
time* by pushing . Desaturation time is determined either
by oxygen toxicity, nitrogen saturation or the regression of
microbubbles, depending on which requires the longer time.
The display switches back to the time of day display after
5 seconds without operation.
* Only displayed if there is a remaining saturation due to the last dive or change
of altitude.
! WARNING
For the calculations of the desaturation and no-fly time it is assumed that the diver breathes air
while on the surface.
2.7 Checking the surface interval
From the time of day display you can check the surface interval by
pushing
(logbook menu) .
The surface interval is the time since the end of the last dive
and is displayed as long as there is remaining saturation.
2.8 Displaying the date
From the time of day display you can display the date
by pushing 1x or 2x (depending on whether there is
desaturation time left).
The display switches back to the time of day display after 5 seconds without operation.
2.9 Checking the battery condition
From the time of day display you can check the battery
condition by pushing 2x or 3 x (depending on whether
there is desaturation time left).
XP-H displays the estimated remaining battery performance
for 5 seconds as a bar graph. If the bar graph shows
3 segments the battery warning appears ->15 and the battery
has to be replaced ->52.
Do not fly icon
No-fly time
No-dive
warning
Residual
nitrogen
bar
Oxygen toxicity
Desaturation time
Surface interval
Date
Battery condition /
performance

15
English
Operation
! WARNING
• If the bar graph shows 2 segments, the battery symbol will blink, on the surface and in dive
mode, to alert the diver of a dangerous situation: the battery may not have enough energy to
finish a dive.
• Replace the battery when the steady battery symbol appears (3 segments)!
F The temperature influences the battery performance. In cold water it is lower than in
warm water. If the battery shows 4 segments on the surface, it is possible for it to
drop to 3 segments during the dive. If this is the case, the backlight will be tempo-
rarily disabled. See below.
Battery performance high enough for diving.
Battery warning appears. Backlight deactivated. Replace the battery! ->52
! WARNING
Flashing battery warning. Audible alarms and attention
messages disabled! Backlight deactivated! Risk of computer
malfunction. Do not let the battery reach this condition!
Diving not possible, dive planner and settings are disabled
Bar graph
interpretation
XP-H marks dives started with 3 or less segments in the logbook with the battery symbol.
Logbook information is not lost even when the battery is removed for a long time.
2.10 Active backlight
The display of XP-H can be illuminated both on the surface and underwater.
The backlight can be activated by pushing . The light will turn off according to the selection in
settings: Set 1 -> Light.
The backlight can only be activated if the computer display is on.
F Repeated activation of the backlight will reduce battery life.

16
Operation / SOS
2.11 Switching off the display
From the time of day display you can switch off XP-H by pushing .
On the surface XP-H switches off automatically after 3 minutes without operation.
2.12 Alarm clock
The alarm clock goes off only at the surface.
If the alarm clock is "on", the time of day display shows .
When alarm is triggered: flashes and special attention beeps are played for 30 seconds or until
the user presses a button.
Setting the alarm clock: ->48 ( " set 2 " )
3 SOS mode
Activation: automatic
If the diver remains above a depth of 0.8m (3ft) for more than three minutes
without observing a prescribed decompression stop, the computer will
automatically switch into SOS mode after the dive.
Push to see the "SOS" sign and the remaining length of the SOS mode.
The dive will be entered in the logbook with "SOS".
The SOS mode will be unlocked after 24 hours.
While in SOS mode, the computer cannot be used for diving.
Diving within 48 hours after the end of an SOS mode will result in shorter no stop times or longer
decompression stops.
! WARNING
• Serious injury or death may result if a diver does not seek immediate treatment should any
signs or symptoms of decompression sickness occur after a dive.
• Do not dive to treat symptoms of decompression sickness!
Time remaining until
SOS mode switches
off automatically

17
English
III Diving with XP-H
III Diving with XP-H
1 Terminology / Symbols
The information on the display of XP-H varies depending on the kind of dive and the dive phase.
1.1 General terminology / Display during no-stop phase
%
CNS O
2
%
DEPTH
NO STOP
DIVE TIME
Current depth
In metres (feet) Dive time
Duration of
the dive (min)
No-stop phase
Dive phase during which surfacing is allowed
without stop.
Decompression phase
Dive phase during which
surfacing is allowed only
after decompression
stops are completed.
Nitrogen loading
bar
No-stop time
Remaining time
at a given depth
during which ascent
is allowed without
decompression
stop (min)
Max depth
Max depth
reached during
the dive
Oxygen toxicity
CNS O2%
Ascent rate
(Only while
ascending)
Time
Current depth 24min
No-stop time
26.2m Max depth
37min dive time
Elapsed bottom time
Depth
Tank pressure -> Max depth -> Temperature -> O2 mix & time of the day -> Tank pressure
1.2 Display during decompression phase
STOP
NO
DECO
CNS O
2
%
DEPTH DIVE TIME
Decompression stop
All required decompression
stops must be observed.
Decompression
stop depth
Deepest stage is
displayed.
Total ascent time to surface (7min)
Time
35.7m
No-stop range Decompression range
Deepest
decompression
stop depth
2min
Decompression
stop duration
6m
3m
Depth
Decompression stop
duration
Prescribed duration of the
decompression stop at the
displayed decompression
stage (minutes).
Total ascent time
Including decompression
stops in minutes.

18
1.3 Nitrox information (O2 information)
For dives with compressed air in normal recreational diving, nitrogen is the decisive gas for the
decompression calculations. When diving with Nitrox, the risk of oxygen toxicity rises with the increase
of the fraction of oxygen and the increase of depth and can limit dive time and the maximum depth.
XP-H includes this in the calculations and displays the necessary information:
O2% mix Fraction of oxygen: The fraction of oxygen in the Nitrox mixture can be set between
21% (normal compressed air) and 50% in 1% increments. Your selected mix will be
the basis for all calculations.
ppO2 max Maximum allowed partial pressure of oxygen: the higher the fraction of oxygen in
the mixture, the shallower the dive depth at which this value of the partial pressure
of oxygen is reached. The depth at which ppO2 max is reached is called Maximum
Operating Depth (MOD).
When you enter the settings for the gas mixture, XP-H will display the ppO2 max limit
setting and the corresponding MOD. XP-H warns you audibly and visually once the
depth is reached at which the ppO2 reaches the maximum allowed value ->23.
F • Default setting of ppO2 max is 1.4bar.
The value of ppO2 max can be set by means of Dive.Log or with "set 1" between
1.2 and 1.6bar (->46). It can also be changed at the time of setting the gas mixture
(->23).
• The CNS O2% value/alarm is not influenced by the selected ppO2 max setting.
CNS O2% Oxygen toxicity: With the increased percentage of oxygen, the oxygen in the tissues,
especially in the central nervous system (CNS), becomes important. If the partial
pressure of oxygen rises above 0.5bar, the CNS O2 value increases, if the partial pressure
of oxygen is below 0.5bar, the CNS O2 value decreases. The closer the CNS O2 value is
to 100%, the closer the limit where symptoms of oxygen toxicity can occur.
Depth
at which ppO2
reaches 0.5bar
for three
commonly
used mixes
CNS O2%
decreases
CNS O2%
increases
21% 13m (43ft)
32% 6m (20ft)
36% 4m (13ft)
ppO2
0.21bar
0.5bar
! WARNING
Nitrox diving may only be attempted by experienced divers after proper training from an
internationally recognized agency.
Terminology / Symbols

19
English
2 Attention messages and alarms
XP-H draws the diver’s attention to certain situations and warns the diver of unsafe diving practices.
Attention messages and alarms are visual and / or audible.
F • The audible attention messages can be switched off in "set 1" ->47 or Dive.Log. With
Dive.Log they can be switched off selectively.
• In addition, the sound can be turned off completely in "set 2" ->50.
! WARNING
If you turn off the sound you will have no audible warnings. Without audible warnings you could
inadvertently get into potentially hazardous situations which could result in death or serious injury.
! WARNING
Serious injury or death may result from failing to immediately respond to alarms given by XP-H.
2.1 Attention messages
Attention messages are communicated
to the diver visually by symbols, letters or
flashing figures. In addition, two short audible
sequences can be heard (in an interval of 4
seconds) in two different frequencies under
water.
4s (can be switched off)
Attention messages come up in the following
situations (more information can be found on
the listed pages):
Page
• Maximum Operating Depth /
ppO2 max is reached 23
• Oxygen toxicity reaches 75% 23
• No-stop time less than 3 minutes 24
• Prohibited altitude (surface mode) 28
• Entering decompression 24
• Tank pressure warning 46
• Depth alarm 45
• Dive time alarm 46
• Tank pressure alarm 46
2.2 Alarms
Alarms are given to the diver visually by
flashing symbols, letters or figures. In addition,
an audible sequence in one frequency can be
heard during the whole duration of the alarm.
An alarm occurs in the following situations
(more information can be found on the listed
pages):
Page
• Oxygen toxicity reaches 100% 23
• Ignored decompression 24
• Exceeding the prescribed ascent rate 22
(Particular scale of beeps, ->22)
• Low battery alarm (without audible alarm):
the battery icon appears if the battery
has to be replaced. 15
Attention messages and alarms

20
3 Preparation for the dive
You have to check the settings of XP-H especially before the first dive. All settings can be checked and
changed directly at XP-H or via Dive.Log.
3.1 Setting the gas mixture and ppO2 max
! WARNING
Before every dive and after changing the tank, make sure that the settings for the gas mixture
correspond with the current mixture used. An incorrect setting causes XP-H to miscalculate this
particular dive. If the fraction of oxygen is set too low this can lead to oxygen poisoning without
warning. If the value is set too high decompression sickness may occur. Inaccuracies in the
calculations are carried over to repetitive dives.
or until
Max Operating
Depth MOD
Change the O2% mix by
(+) and
(–) ppO2
max
Change the ppO2 max by
(+) and (–)
To set the gas mixture, XP-H must be in user mode (time of day display).
1. Push or until the symbol for the setting of the O2 mixture
appears.
2. Confirm that you wish to change the displayed oxygen fraction by
pushing .
3. Change the oxygen fraction in increments of 1% by pushing
or . XP-H will display the current fraction of oxygen,
the maximum partial pressure limit (ppO2 max) and the MOD.
4. Confirm the selected percentage with .
5. By pushing or you can change the ppO2 max for the
chosen fraction of oxygen down to 1.0bar. XP-H will now display the
corresponding MOD for the new ppO2 max.
6. Confirm your ppO2 max settings with .
F • Without confirmation the display will disappear after 3 minutes and your entries will not
be accepted.
• Automatic reset of the O2% mix to 21% can be set with "set 1" ->46 or Dive.Log between
1 and 48 hours or to "no reset" (default).
3.2 Preparation for the dive and function check
Switch on XP-H by pushing and check the test display: Are all
elements of the display activated? Do not use XP-H if the display does not
show all elements. When switching on XP-H with , the test display will
not appear.
! WARNING
Check the battery capacity before each dive ->14.
Preparation for the dive