SubGear XP Air User manual

English
Deutsch
Nederlands
XP Air

2
! WARNING
You must carefully read and understand this entire manual before using your new computer.
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 the computer!
Guidelines for the use of your SUBGEAR dive computer:
The following guidelines 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.
• This computer is designed for dives with Nitrox (to a max.100% O2) and compressed air
(21%O2) only. Do not use the computer 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 this computer with open circuit breathing systems. The computer must be set for a
determined gas mixture.
• Only use this computer for diving with an independent breathing apparatus. The computer is
not designed for long term exposures with Nitrox.
• Always observe the visual and audible alarm signals of the computer. Avoid situations of
increased risk which are marked with a warning sign in this operating manual.
• If the ascent arrow appears, start to ascend.
• If the flashing ascent arrow appears, start to ascend immediately.
• This computer has a ppO2 warning, the default limits of which are set at 1.4 bar ppO2max.
This limit can be adjusted via Dive.Log. An alteration of the ppO2max to higher than 1.6 bar is
dangerous and we do not recommend this.
• Frequently check the "oxygen clock" (CNS O2), especially in the range higher than 1.4 bar ppO2.
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. The computer 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 the computer 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 5 metres /15
ft) should be initiated immediately.
Safety considerations
I Safety considerations

3
ENGLISH
Safety considerations
• 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 (30 feet) 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 AIR does not substitute for a dive buddy.
• Only make dives that are appropriate to your level of dive training. A dive computer does not
increase your knowledge of diving.
• 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
this computer! 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%.
• 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 microbubble warning
NO
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.
Altitude and diving
• Do not dive at altitudes higher than 4000m (13000 feet).
• After a dive do not rise to altitudes that the computer prohibits via the flashing altitude
segments (see page 26).
Flying after diving
• After diving, wait at least 24 hours prior to flying.
XP AIR 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 250:2000 and
EN 13319:2000.
EN250:2000 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
Congratulations on purchasing XP AIR dive computer and welcome to SUBGEAR. From now on you
will enjoy the assistance of the most extraordinary dive computer - equipped with SUBGEAR's most
innovative technology - while diving.
We thank you for choosing this computer and we hope you will enjoy safe dives in the future! Further
information on SUBGEAR XP AIR dive computers and other products by SUBGEAR can be found on
our web page at www.subgear.com.
To make this manual easier to read we will use the term 'XP AIR' as an abbreviation for 'SUBGEAR
XP AIR diving computer' throughout this booklet.
Safety considerations
Dive computers provide divers with data; they, however, do not provide the knowledge 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 AIR.
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 AIR.
!
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. ->10
Audible signals
Audible attention signal
4s Audible alarm signal
Instructions for manual input
Bridge contacts
Example: bridging contacts B and E
– + E
B
Introduction

5
ENGLISH
Quick reference
Dive planner icon
Logbook icon
Microbubble level icon (input / MB level reduced)
O2 mix icon (input)
Current depth
Altitude sections
Ascent obligation
Too fast ascent
Maximum depth
Microbubble level
Maximum Operating
Depth (MOD)
Service icon
Do not fly icon
Dive time / No-fly time / SOS duration
Oxygen toxicity CNS O2%
Ascent rate
Battery capacity
Desaturation time indicator
Desaturation duration / Duration of surface interval
Total ascent time / Dive number
Increased workload warning
Transmitter warning Remaining bottom time RBT
Decompression depth / Level stop depth
No-stop time / Decompression duration / MB no-stop time
Level stop duration / Duration of Microbubble Warning
Tank pressure / Gas consumed
Partial pressure of oxygen ppO2
Logbook indicator
Ascent time icon
No-stop indicator
Level stop indicator
Decompression stop obligation
Ignored decompression stop
Tank pressure warning
Decompression stop indicator
Gauge icon
Do not dive icon
Microbubble warning
O2 mix
Temperature
CNS O2%
NO
NO
DECO
STOP
NO STOP
LEVELSTOP
%
Operating scheme
Start / Confirmation / Enter
+ / Navigate
– / Navigate
%
Logbook
Dive planner
Battery capacity
O2 mix Microbubble level
Exit (2 sec.) Exit Confirmation Confirmation
%
Switching on
+
–
Gauge mode
Confirmation
+
–
Navigation
Display
switched off
%
Bottom time
+
–
Surface
interval
+
–
( )
Percentage
of oxygen
Microbubble
level
Gauge mode
on and off
+
–
Maximum
operating
depth (MOD)
+
–
Dive number
+
–
CNS O
2
%
NO STOP
%
CNS O
2
%
%
Display switches off automatically after 3 minutes without operation.
Quick reference

6
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 ............................................................................................................................ 6
II System and operation .............................................................................................................. 8
1 System description ...................................................................................................................... 8
2 Operation ..................................................................................................................................... 8
2.1 Operating elements ......................................................................................................... 8
2.2 Dive.Log ......................................................................................................................... 9
2.3 Switching on the display ................................................................................................ 10
2.4 Checking the battery capacity ....................................................................................... 10
2.5 Selection and activation of user functions .................................................................... 10
2.6 Active backlight ............................................................................................................. 11
2.7 Switching off the display ................................................................................................ 11
3 SOS mode ................................................................................................................................ 11
4 Setting up XP AIR (transmitter and dive computer)..................................................................... 12
4.1 Mounting of transmitter ................................................................................................. 12
4.2 Pairing of transmitter and dive computer ....................................................................... 13
III Diving with XP AIR .................................................................................................................. 15
1 Terminology / Symbols ............................................................................................................... 15
1.1 General terminology / Display during no-stop phase ..................................................... 15
1.2 Display during decompression phase / Remaining Bottom Time (RBT) ......................... 15
1.3 Nitrox information (O2 information) ................................................................................. 16
2 Attention messages and alarms ................................................................................................. 17
2.1 Attention messages ....................................................................................................... 17
2.2 Alarms ........................................................................................................................... 17
3 Preparation for the dive .............................................................................................................. 18
3.1 Setting the gas mixture and MOD .................................................................................... 18
3.2 Setting the MB level ......................................................................................................... 18
3.3 Preparation for the dive and function check .................................................................. 18
4 Functions during the dive ........................................................................................................... 19
4.1 Immersion ........................................................................................................................ 19
4.2 Dive time ...................................................................................................................... 19
4.3 Current depth ................................................................................................................ 19
4.4 Maximum depth ........................................................................................................... 19
4.5 Temperature .................................................................................................................. 20
4.6 Ascent rate .................................................................................................................... 20
4.7 Partial pressure of oxygen (ppO2 max) / Maximum Operating Depth (MOD) .................. 21
4.8 Oxygen toxicity (CNS O2%) ........................................................................................... 21
4.9 Tank pressure ............................................................................................................... 22
4.10 Remaining Bottom Time (RBT) ...................................................................................... 22
4.11 Decompression information ........................................................................................... 23
5 Functions at the surface ............................................................................................................. 25
5.1 End of a dive ................................................................................................................. 25
5.2 Desaturation time .......................................................................................................... 25
5.3 No-fly time ..................................................................................................................... 25
5.4 Microbubble warning ..................................................................................................... 25

7
ENGLISH
List of chapters
6 Diving in mountain lakes ............................................................................................................. 26
6.1 Altitude ranges .............................................................................................................. 26
6.2 Prohibited altitude ......................................................................................................... 26
6.3 Decompression dives in mountain lakes ........................................................................ 27
IV Gauge mode .............................................................................................................................27
V Diving with microbubble levels (MB) ......................................................................................29
1 Comparison of dives with MB level L0 and MB level L5 ............................................................. 29
2 Terminology ................................................................................................................................ 30
2.1 Display during microbubble (MB) no-stop phase ........................................................... 30
2.2 Display during level stop phase ..................................................................................... 30
3 Preparation for a dive with microbubble levels (MB levels) .......................................................... 31
3.1 Setting the MB level ...................................................................................................... 31
4 Functions during the dive with microbubble levels ...................................................................... 31
4.1 Level stop information ................................................................................................... 31
4.2 Total time of ascent ....................................................................................................... 32
4.3 Decompression obligation ............................................................................................. 32
4.4 Level stop and deco stop .............................................................................................. 33
5 Complete a dive with MB levels ................................................................................................. 33
VI Dive planner ..............................................................................................................................34
1 Planning a no-stop dive ............................................................................................................. 34
2 Planning a decompression dive .................................................................................................. 35
3 Leaving the dive planner ............................................................................................................ 35
VII Logbook ....................................................................................................................................36
1 Survey ........................................................................................................................................ 36
2 Operation ................................................................................................................................... 36
VIII Appendix ...................................................................................................................................37
1 Technical information ................................................................................................................. 37
2 Maintenance .............................................................................................................................. 37
2.1 Replacing the battery of the transmitter ......................................................................... 38
3 Conversion of tank pressure ...................................................................................................... 40
4 Warranty .................................................................................................................................... 40
5 FCC ........................................................................................................................................... 41
6 Index .......................................................................................................................................... 41

8
System and operation
II System and operation
1 System description
XP AIR displays all important dive and decompression data and comes with a unique receiver which can
receive tank pressure data from a transmitter. Mounted at the high pressure (HP) outlet of the regulator,
the transmitter measures the tank pressure and radio transmits the information to XP AIR. SUBGEAR's
specially patented transmission process prevents interference and ensures continuous and reliable
reception.
XP AIR has a data memory which stores the dive data. The data can be transmitted with an infrared inter-
face (IrDA) and the Dive.Log software to a Windows® personal computer.
The Dive.Log CD software is included with the XP AIR Package. Infrared interfaces are available in PC
stores. A list of recommended interfaces is available on the SUBGEAR homepage (www.subgear.com).
XP AIR
Pressure transmitter
Infrared port
Dive.Log
Infrared Interface
(option)
2 Operation
F On page 5 you will find an operating schematic
2.1 Operating elements
XP AIR has 4 operating contacts B, E, +, – on the outside of the housing.
For manual operation, touch base contact B and any one of the other three
contacts above the display with moistened fingers («bridging» contacts).
Contact B: Base contact, which has to be touched for all operations.
Contact E: Enter contact. It serves to switch on XP AIR and to confirm
or enter the displayed value. It is therefore comparable to the ENTER or
RETURN key of a keyboard.
+ / – Contacts: These allow to navigate between menus and, once inside a
menu, to increase or decrease the indicated value.
Contacts

9
ENGLISH
System and operation
2.2 Dive.Log
With Dive.Log you can transfer dive data to a personal computer and graphically display the data.
The following settings may be changed with Dive.Log:
• Unit system metric/imperial
• Audible attention signal suppression selective
• Gauge mode on / off
• Depth alarm 5 - 100 m (20 - 330 feet)
• Backlight illumination duration 2-12 sec.
• Maximum partial pressure of oxygen (ppO2 max) 1-1.95 bar
• Time limit to reset the O2 % mix to air no reset / 1 - 48 hrs.
• Minimum reserve pressure at the end
of the dive (basis for RBT calculation) 20 – 120 bar (300 - 1750 psi)
• Tank pressure alarm 50 - 200 bar (750 - 2900 psi)
• Workload sensitivity 25 steps
The following data may be recalled with Dive.Log:
• Number of past dives
• Total duration of past dives
• Atmospheric pressure
• Pairing information
• Dive profile
• Logbook
• Temperature curve
• Workload curve
• Alarms and attention messages

10
System and operation
2.3 Switching on the display
• automatically, on submerging in water or when
adaptation to atmospheric pressure is necessary;
• manually, by bridging contacts on housing (B-E).
• When XP AIR is in state of rest no information
is displayed but the atmospheric pressure is
continuously monitored. If a higher altitude range
is detected, XP AIR switches on for 3 minutes
automatically -> 26.
XP AIR switches on by bridging the contacts B and E.
All segments light up for 5 seconds.
Afterwards the display shows the selected O2 mix, the
temperature and in certain circumstances an altitude
range ->26.
If the transmitter is switched on and located within
transmitting distance, the tank pressure is displayed,
otherwise "---" will be displayed. If no transmitter has
been paired yet, the display will be blank.
If there is a remaining saturation due to the last dive or
change of altitude, XP Air also displays the remaining
desaturation time, the oxygen toxicity and the "no-fly
time" ->25.
2.4 Checking the battery capacity
After switching on XP AIR you can check the battery capacity by bridging
the contacts B and E. The remaining capacity is displayed for 3 seconds as
a percentage. If the value reaches 0%, the battery warning gets activated
(->17) and the battery has to be replaced by an authorised SUBGEAR
dealer.
For a 7-day diving vacation XP AIR uses between 2 – 5 % of its battery
capacity.
2.5 Selection and activation of user functions
At the surface you can select the dive planner, the logbook
and gauge mode as well as the functions to enter the O2%
mix and the microbubble levels by bridging the contacts
+ and B or – and B.
After the selection of the desired function you can activate and deactivate it by bridging the
contacts B and E.
F Details to the user functions are to be found on the pages mentioned above.
%
CNS O
2
%
NO
%
CNS O
2
%
NO
NO
DECO
STOP
NO STOP
LEVELSTOP
%
Do not fly icon
Temperature
O2 Mix
No-fly time
Oxygen toxicity
Desaturation time
Battery capacity
Gauge mode ->27
Input microbubble level ->31
Input O
2
mix ->18
Logbook ->36
Dive planner ->34

11
ENGLISH
System and operation
2.6 Active backlight
The display of XP AIR can be illuminated both on the surface and
underwater.
The backlight can be activated by pressing on top of the case. The light
will turn off automatically after 8 seconds or after the time selected via
Dive.Log.
The backlight can only be activated if the computer display is on.
2.7 Switching off the display
On the surface XP AIR switches off automatically after 3 minutes without operation.
3 SOS mode
Activation: automatic
If the diver remains above a depth of 0.8m (3 feet) for more than three
minutes without observing a prescribed decompression, the computer will
automatically switch into SOS mode after the dive.
The display shows the "SOS" sign and the remaining length of the SOS
mode. The dive will be entered in the logbook with "SOS". Other than that
the SOS mode has no further impact on the displays and functions on the
surface.
• 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!
• Diving in SOS mode is extremely dangerous and you must assume full responsibility for such
behaviour. SUBGEAR will assume no liability.
Once in the SOS mode, the computer will lock up and will be inoperable as a diving instrument for 24
hours.
A diving accident can be analyzed at any time in the logbook and downloaded to a PC by means of
the infrared interface (IrDA) and the Dive.Log software.
! 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!
• Diving in SOS mode is extremely dangerous and you must assume full responsibility for such
behaviour. SUBGEAR will assume no liability.
Once in the SOS mode, the computer will lock up and will be inoperable as a diving instrument for 24
hours.
F A diving accident can be analyzed at any time in the logbook and downloaded to a PC by
means of the infrared interface (IrDA) and the Dive.Log software.
Time remaining until
SOS mode switches
off automatically
CNS O
2
%
NO
NO
%

12
System and operation
4 Setting up XP AIR (transmitter and dive computer)
4.1 Mounting of transmitter
The transmitter is mounted at the high pressure (HP) outlet of the regulator’s first stage before the first dive.
! WARNING
Use air and Nitrox components in accordance with the law of the country.
Procedure:
Do not hold the transmitter by
its plastic part.
HP
(Adaptor)
Mount the transmitter at the
HP oulet. If the threads do
not match, you can get a
fitting adaptor at your diving
equipment retailer.
Tighten the transmitter by
means of a size 3/4" wrench.
The transmitter is best mounted laterally on the regulator.
It is advisable to mount the transmitter on the same side that the computer is located. This is the
optimal position for transmission.
Position of the transmitter
for left handers.
Position of the transmitter
for left handers, if there is no
connection possible on the left
hand side.
Position of the transmitter
for right handers.
Position of the transmitter for
right handers, if there is no
connection possible on the
right hand side.

13
ENGLISH
System and operation
4.2 Pairing of transmitter and dive computer
To receive the data of the transmitter, the transmitter itself must be paired with XP AIR.
Pairing is necessary:
• before the first use of XP AIR with the transmitter;
• if you use a new transmitter or a new computer;
• after changing the battery.
Pairing procedure:
1. Shut the valve, depressurise the regulator and wait for 15 seconds.
2. Switch on XP AIR (bridge contacts B and E).
3. Move the dive computer and transmitter into the shown
position.
F Transmitter and dive computer must be in physical
contact during the entire pairing procedure.
4. Open the tank valve. The transmitter briefly sends a
pairing sequence to the computer.
5. The dive computer shows a flashing "PAIr" shortly after
the valve has been opened.
6. In order to confirm the pairing, the B and E contacts have to be bridged
with-in 5 sec. A beep confirms the input and the "PAIr" display remains
still.
7. "PAIr" disappears after approx. 10 sec.
In case of faulty pairing, the display "FAIL" appears instead of "PAIr". In that
case, completely purge the regulator and repeat the pairing procedure.
This is only possible after at least 15 seconds.
F • Pairing of transmitter and dive computer may already be carried out at home and need only
be executed once, before the first use.
• You may delete the pairing of transmitter and dive computer by means of the Dive.Log
software.
10 sec.
%
%
%
%

14
System and operation
How to check if transmitter and computer are paired correctly:
1. Switch on the computer manually (B and E)
2. Move the computer into transmitting range of the transmitter.
3. Open the tank valve. The transmitter switches on automatically.
4. Check the display: Pairing has been carried out correctly if the pressure
is displayed within 5-10 seconds.
If the transmitter has been correctly paired, but XP AIR cannot receive the
tank pressure, "- - -" will appear on the display. In that case, check the
position of transmitter and dive computer.
If the transmitter has not been paired, or if an existing pairing has been
deleted via Dive.Log, the display will remain empty.
In that case, transmitter and computer must be paired again.
Pairing ok
Pairing not present
%
%
Pairing present, no pressure
data available
%

15
ENGLISH
Diving with XP AIR
III Diving with XP AIR
1 Terminology / Symbols
The information on the display of XP AIR varies depending on the kind of dive and the dive phase.
F For information about diving with microbubble levels (MB levels) see chapter V ->29.
1.1 General terminology / Display during no-stop phase
37 min. Dive time
Elapsed bottom time
No-stop time
24min
Current depth
Maximum depth
26.2 m
Decompression phase
Dive phase during which
surfacing is allowed only
after decompression
stops are completed.
No-stop phase
Dive phase during which surfacing is allowed
without stop.
Ascent rate
(Only while
ascending)
SPEED
%
Tank
pressure
Current depth
In metres (feet)
Maximum depth
reached during the dive
No-stop time
Remaining time
at a given depth
during which ascent
is allowed without
decompression
stop (min).
Oxygen toxicity
CNS O2%
Time
Depth
Dive time
Duration of
the dive (min)
O2% Mix
Selected oxygen fraction
RBT, Remaining
bottom time
Temperature
CNS O
2
%
NO STOP
%
1.2 Display during decompression phase / Remaining Bottom Time (RBT)
CNS O
2
%
DECO
STOP
%
6 m
35.7 m
3 m
RBT 21 min
Decompression stop
All required decompression
stops must be observed.
Decompression
stop depth
Deepest stage is
displayed.
Decompression
stop duration
Prescribed duration of the
decompression stop at the
displayed decompression
stage (minutes).
Total ascent time
Including decompression
stops in minutes.
Remaining Bottom Time, RBT
Maximum remaining time at current
depth including all decompression
obligations (minutes).
Decompression stop duration 2 min
Time
Depth
Total ascent time to surface (7 min)
Deepest
decompression
stop depth
Decompression rangeNo-stop range

16
Diving with XP AIR
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 AIR
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 100% 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). Default setting is 1.4 bar, but it can be set by means of Dive.
Log between 1.0 and 1.95 bar. When you enter the settings for the gas mixture, XP
AIR will display the ppO2 max. limit setting and the corresponding MOD. XP AIR warns
the diver audibly and visually once the depth is reached at which the ppO2 reaches the
maximum allowed value.
F • The partial pressure limit set by means of Dive.Log can be reduced manually at
XP AIR (->18, setting the gas mixture).
• The CNS O2% value/alarm is not influenced by the selected ppO2max. 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 0.5 bar, the CNS O2 value increases, if the partial
pressure of oxygen is below 0.5 bar, the CNS O2 value decreases. The closer the CNS
O2 value is to 100%, the closer the limit where symptoms can occur. See page 21.
CNS O2%
increases
ppO2
Depth
at which ppO2
reaches 0.5 bar
for three typical mixes
0.5 bar
21% 13m (43ft)
32% 6m (20ft)
36% 4m (13ft)
CNS O2%
decreases
0.21 bar
! WARNING
Nitrox diving may only be attempted by experienced divers after proper training from an
internationally recognized agency.

17
ENGLISH
Diving with XP AIR
2 Attention messages and alarms
XP AIR draws the diver’s attention to certain situations and warns the diver of unsafe diving practices.
Attention messages and alarms are always visual and audible under water, only visual at the surface
except the decompression alarm.
F The audible attention messages (but not the alarms) can be selectively switched off with
Dive.Log.
! WARNING
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.
4sec (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 / max
ppO2 is reached 21
• Set maximum depth is reached 19
• Oxygen toxicity reaches 75% 21
• No-stop time = 2 minutes 23
• Prohibited altitude* (surface mode) 26
• Entering decompression when diving
with L0 24
• Remaining Bottom Time < 3 minutes 22
• Tank pressure has reached set warning
level 22
• Increased workload 22
Diving with microbubble levels (L1-L5):
• MB no-stop time = 0 31
• MB level stop ignored 32
• MB level reduced 32
• Entering decompression when diving
with MB level L1-L5 32
*without audible attention beep
2.2 Alarms
Serious injury or death may result from failing
to immediately respond to alarms given by
XP AIR.
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.
(can not be switched
off)
An alarm occurs in the following situations
(more information can be found on the listed
pages):
Page
• Oxygen toxicity reaches 100% 21
• Ignored decompression 24
• Remaining Bottom Time = 0 22
• Exceeding the prescribed ascent rate 20
(Particular scale of beeps, ->20)
• Low battery alarm** see below
Low battery alarm XP AIR**
The service symbol
appears if the battery
capacity reaches 0%.
Take the unit to your
authorised SUBGEAR
retailer.
Transmitter battery low: **
"bAt" flashing and alternating with the display
of the tank pressure.
Replace the battery in
the transmitter ->38.
**without audible alarm

18
Diving with XP AIR
3 Preparation for the dive
3.1 Setting the gas mixture and MOD
! 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 AIR 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.
To set the gas mixture, XP AIR must be in user mode.
1. Bridge contacts B and + or B and – until the symbol for the setting
of the O2 mixture appears.
2. Confirm that you wish to change the displayed oxygen fraction by
bridging B and E.
3. Change the oxygen fraction in increments of 1% by bridging B and
+ or B and –. XP AIR will display the current fraction of oxygen, the
maximum partial pressure limit, ppO2 max (as pre-set by means of
Dive.Log) and the MOD.
4. Confirm the selected percentage with B and E.
5. By bridging B and + or B and – you can change the MOD for
the chosen fraction of oxygen. XP AIR will now display the
corresponding partial pressure limit (ppO2 max) for the new MOD.
6. Confirm your MOD settings with B and E.
F • Without confirmation the display will disappear after 3
minutes and your entries will not be accepted.
• The time to reset the O2 % mix to air can be set with
Dive.Log between 1 and 48 hours or to "no reset" (default).
3.2 Setting the MB level See chapter V, ->29
3.3 Preparation for the dive and function check
The following descriptions of the preparation are based on the assumption that the transmitter has
been correctly mounted at the HP outlet of the regulators (->12) and successfully paired with XP AIR
(->13).
1. Mount the regulator together with the transmitter on the tank
! WARNING
2. If present, check the reserve valve of your tank, the reserve valve must be open.
3. Switch on XP AIR (B-E) and check the test display: Are all elements
of the display activated? Do not use XP AIR if the display does not
show all elements.
4. Open the valve (transmitter will switch on automatically) and check
the tank pressure (after approx. 10 seconds). If the pressure is
insufficient, change the tank.
5. Check the connections and instruments for leaks. Never dive with
leaky equipment!
%
+
–
…
…
O2% mix
PpO2max.
Max. Operating
%
+
–
ppO2max.
Depth MOD
CNS O2%
NO
NO
DECO
STOP
NO STOP
LEVELSTOP
%

19
ENGLISH
Diving with XP AIR
4 Functions during the dive
4.1 Immersion
After immersion, starting at a depth of about 0.8 m (3 ft), all diving functions are monitored, i.e. depth
and dive time displayed, maximum depth stored, saturation of tissues calculated, no-stop time or
decompression prognosis determined, ascent rate controlled and displayed and the correctness of the
decompression procedure supervised. In addition, XP AIR also shows the tank pressure and about 2
minutes into the dive the Remaining Bottom Time (RBT) is displayed.
4.2 Dive time
The whole time spent below a depth of 0.8m (3 feet) is displayed as dive
time in minutes. The time above 0.8m (3 feet) is counted as dive time only
if the diver descends again below 0.8m (3 feet) within 5 minutes.
While the dive time is running, the colons on the right of the figures are
flashing in one second intervals. Maximum dive time displayed is 199
minutes.
F If a dive lasts longer than 199 minutes the dive time display starts
again at 0 minutes.
4.3 Current depth
Current depth is given in 10 cm increments (1 foot). At a diving
depth of less than 0.8 m (3 ft) the display shows "– – –".
F Depth measurement is based on freshwater. Therefore,
XP AIR shows a slightly greater depth when diving in salt
water, depending on the salinity of the water. No calcula-
tion however is affected.
4.4 Maximum depth
Maximum depth is only displayed if it exceeds the current depth by more
than 1 m (3 feet) (maximum indicator function).
! WARNING
Set maximum depth reached
If the maximum depth set with Dive.Log has been reached (default
40m/130 feet), the current depth will flash and the ascent arrow will be
displayed. Ascend until the ascent arrow disappears.
NO STOP
Dive time
NO STOP
%
%
Current depth
NO STOP
CNS O2%
Maximum depth
CNS O
2
%
NO STOP
4 sec
Ascent arrow

20
Diving with XP AIR
4.5 Temperature
XP AIR permanently displays the temperature, under water and on the sur-
face as long as the computer is turned on.
4.6 Ascent rate
Optimal ascent rate varies depending on depth between 7 and 20 m/min
(23 and 67 ft/min). It is displayed as a percent of the reference variable
ascent rate. If the ascent rate is greater than 100% of the set value, the
black arrow "SLOW" appears. If the ascent rate exceeds 140%, the arrow
starts flashing.
XP AIR provides an audible alarm if the ascent rate is 110% or greater. The
intensity of the alarm increases in direct proportion to the degree that the
prescribed ascent rate is exceeded.
! WARNING
The prescribed ascent rate must be observed at all times! Exceeding the prescribed ascent rate
can lead to microbubbles in the arterial circulation which can lead to serious injury or death due
to decompression sickness.
• In case of an improper ascent XP AIR may require a decompression stop even within the no-stop
phase because of the danger of microbubble formation.
• The decompression duration necessary for the prevention of microbubbles can increase massively
if the ascent rate is exceeded.
• From great depth a slow ascent may cause heightened saturation of tissues and an extension of
both decompression duration and total ascent time.
At shallow depth, a slow ascent may shorten the decompression duration.
• Display of the ascent rate has the priority over "CNS O2".
! WARNING
Ascent rate Visual alarm Audible alarm
SPEED
SPEED
SPEED
SPEED
S
L
O
W
S
L
O
W
S
L
O
W
S
L
O
W
%
%
%
%
Reduce ascent rate
Excessive ascent rates for longer periods are entered in the logbook.
The following ascent rates correspond to the 100% value in XP AIR.
depth (m) <6 <12 <18 <23 <27 <31 <35 <39 <44 <50 >50
speed (m/min) 7 8 9 10 11 13 15 17 18 19 20
depth (ft) <20 <40 <60 <75 <88 <101 <115 <128 <144 <164 >164
speed (ft/min) 23 26 29 33 36 43 49 56 59 62 66
NO STOP
Temperature
NO STOP
Ascent rate