2 Aladin Air Z Your Personal Companion
By considering your individual conduct, workload and temperature changes, Aladin Air Z is your personal control instrument. Aladin Air Z relies on the latest results of medical and physiological research for the calculation of decompression. This research has helped in the development of an adaptive calculation model unique to the present day. Aladin Air Z was exclusively developed for diving with compressed air and distinguishes itself from other commercial diving computers by a number of new functions: The new calculation model ZH-L8 ADT considers for the first time 8 body tissues, the divers conduct and the ambient conditions. Therefore, a more precise decompression indication is possible for risk situations, which increases safety in these cases. The measurements of scuba tank pressure are transmitted to Aladin Air Z by means of a transmitter. Faulty transmission of data between transmitter and Aladin Air Z is prevented by a number of precautions. Tank pressure can easily be checked at any time. In addition, the pressure rates allow calculation of the divers air consumption and a prediction of the remaining air time at the current depth. The calculation for RBT (Remaining Bottom Time) the time left to the diver until he must start the ascent according to the calculated decompression programme therefore includes consideration of tank pressure and the individual divers rate of air consumption.
Where a reserve valve is used in order to get correct air-time-calculations diving has to be done with an open reserve valve! Alarms are given optically and acoustically. The reason for the acoustic alarm can be distinguished by the characteristics of the sound. By means of the logbook, the diver can directly call up the information of the last 19 dives. Via interface to the PC, 37 dives and 200 minutes of precise dive-profile in intervals of 20 seconds can be read out. The dive planner allows the advance planning of no-stop dives and decompression dives with freely determinable surface intervals. The proven way of carrying the dive computer on ones wrist, giving maximum freedom of movement and easy operation, plus a clearly arranged display of the data, are the prominent points of comfort of Aladin Air Z.
3 Calculation Model ZH-L8 ADT
3.1 Description The Model ZH-L8 ADT (8 compartments with a nominal half-time period from 5 to 640 minutes) differs considerably from other models by the consideration of additional physiological processes: 1.Blood perfusion of the organs is not constant. Skin and muscles in particular are subject to considerable changes of blood perfusion depending on temperature and workload. A change in blood perfusion also causes a change of the saturation tolerance. The model takes these effects into account. Therefore, skin and muscle compartments show variable half-time periods and saturation tolerances. The necessary decompression times are calculated according to the divers workload and the decreasing skin temperature. The decrease of skin temperature is estimated based on the water temperature and the dive time. At the surface, the divers physical performance is lower than during the dive. By considering the differences in physical performance the no fly time becomes considerably longer. 2.The model considers inert gas not only in the dissolved state, but also in the gaseous phase (microbubbles). Formation of microbubbles is calculated with allowance for the different influences in arterial and venous blood. With normal ascents gas bubbles mainly form in venous blood, with fast ascents also in arterial blood and on ignoring decompression stops in the tissues. As the model calculates microbubbles, those physiological processes are reconstructed which actually occur. The bubbles on the venous side of the circulation are carried into the lungs where they change the arterial nitrogen pressure. This influences mainly repetitive dives, dives with very long decompression times and the no fly time. Gross disregard of the ascent rate, exceeding the decompression depth and repeated ascents to the surface (yoyo dives), can all cause microbubbles to form on the arterial side and in tissues. Where the bubbles partially impair circulation, the rate of gas diffusion and the saturation tolerance are changed. Decompression time, and if necessary decompression depth, are adjusted so that existing bubbles stop growing. In addition, altered decompression assures that the tissue desaturates sufficiently if microbubbles impair circulation locally. The calculation of the gas bubbles results in a new ascent instruction. The ascent rate near the surface is reduced down to 7m/min. This prevents with high reliability the formation of microbubbles in the arterial circulation and minimizes the formation of microbubbles in the venous circulation after the dive.

3.2 Advantages On first dives with correct diving technique and avoiding risk situations, there are no extended decompression times. On the other hand, it is possible to react correctly in risk situations due to the realistic simulation of the physiological processes in the body. This increases safety considerably. Risk situations are, for example: Repetitive dives (especially with short intervals) and dives on several successive days Dives in cold water Dives with increased workload (currents, exertion) Yoyo dives Flying after the dive Excessive ascent rate.
In case of mistakes on the part of the diver, actual prevention of decompression sickness is possible for the first time due to the reconstruction of the bubble formation and its consequences. The correction of the decompression must not be confused with a real recompression, which serves as therapy of existing damage.

4 Safety in Diving

With its new decompression model and with the calculation of air-time Aladin Air Z offers a so far unreached level of safety. However, responsibility for the dive finally remains with the diver as before. The usual diving caution is still absolutely necessary when diving with Aladin Air Z. In case of diver mistakes (ignoring decompression stops, excessive ascent rate etc.) Aladin Air Z can calculate a corrected ascent instruction immediately which minimizes the occurrence of decompression sickness. The prevention of barotrauma and nitrogen narcosis still lies in the hands of the diver. Aladin Air Z is a highly developed technical instrument of high reliability. Despite this the user of the Aladin Air Z is to have an understanding of the physiological interrelations, to know the use of decompression tables and to have them on every dive. Should an incident occur, the detailed previous history of the incident is stored in the dive computer. The evaluation of these records allows better diagnosis and the most effective treatment for the diver.
II Aladin Air Z The System
1 Description 1.1 1.2 2.1 3.1 3.Setting Up (Transmitter and Dive Computer)
System hardware __________________________16 Safety of transmission ______________________17 Operating modes and functions ______________18 Operating_________________________________19 Active backlight ___________________________20 Operating modes __________________________25

depth dive time depth dive time
The transmitter does not work if the regulator is unpressurised or if there is no air consumed for 3 minutes. The dive computer can only receive data from the transmitter if the computer and transmitter are paired. If the pairing has not been carried out, there are no air data displayed by the dive computer and Aladin Air Z works as a conventional dive computer.

with transmitter

without transmitter

2 Dive Computer

3.1 Operation Switching on display: automatically, on submerging in water or when adaptation to atmospheric pressure is necessary. manually by operating contacts on housing. Switching off display: automatically, after three minutes without operation. Aladin Air Z 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.
Contact B: Base contact, which has to be touched for all operations. Contact E: Enter contact. It serves to switch on the computer, to activate the logbook and dive-plan mode and to switch between no-stop and decompression planning. It is also used to confirm inputs and is therefore comparable to the ENTER- or RETURN-key of a computer. + / contacts: They serve to select the logbook and dive-plan as well as to set values (time, depth, dive-number etc.).

3 Operating

Active backlight The display of the Aladin Air Z can be illuminated both on the surface and underwater. The backlight can be switched on by pressing the unit above the display. The light will turn off automatically after 7 seconds. The backlight can only be activated if the computer display is on. The active backlight is no substitute for a dive torch. When diving at night or at increased depth we recommend the use of a dive torch. Replace the battery if the battery warning appears.

3 Dive Computer

On page 2 of the English manual you will find a reference guide. On page 3 of the German manual you will find an openable operating scheme. 1. Aladin Air Z is in a state of rest; no information is displayed (>sleep-mode or >surface-sleep-mode).
2. Bridging B and E activates the computer >readymode or >surface-mode.

depth dive time depth

DO NOT FLY

DESATURATION

3. A second bridging of contacts B and E activates the display of the remaining battery capacity for approximately 5 seconds. As soon as the battery capacity is 0%, a battery alarm is sent. There is still a small reserve left at bAt 0%.

Ready-mode

Surface-mode

depth dive time

4a Selecting the logbook function: B and + Cancel: B and or automatically after three minutes without operation
4b Activating the logbook: B and E. Aladin Air Z shows the most recent dive.
4c Leaving the logbook: B and E or automatically after three minutes without operation.
Surface-mode or after 3 minutes
5a Selecting the dive-plan function: B and. Cancel: B and + or automatically after three minutes without operation.
5b Activating the dive-plan B and E. Der Aladin Air Z starts by listing no-stop times. If the dive-plan is activated out of the surfacemode, first enter the desired interval by B and + or B and. Confirmation with B and E.

or after 3 minutes

5c Leaving the dive-plan: B and E for approx. 3 seconds or automatically after three minutes.

3.2 Operating modes

Aladin Air Z works in various operating modes: Sleep-mode: Activation: automatically When Aladin Air Z is not used it is in the so called sleep-mode. In this case, the electronics are sleeping for the most part, the display does not show any information. The computer is briefly activated once every minute to measure atmospheric pressure. The display remains switched off. If a change in altitude is recognized, Aladin Air Z switches to > surface-mode for 3 minutes.
DO NOT FLY DIVEPLAN LOGBOOK

S L O W

DECOSTOP

ft h m

psi bar
Ready-mode: Activation: By touching contacts B and E from sleep-mode. To check the display, all signs light up for 5 seconds. Aladin Air Z switches into ready-mode afterwards. In ready-mode, the display is switched on and in certain circumstances altitude sections are also displayed. If the paired transmitter is switched on and located within transmitting distance, the tank-pressure is displayed, in other cases only <--->. On touching contacts B and E in ready-mode once more, Aladin Air Z displays the remaining battery capacity in percent. Three minutes after activating readymode, Aladin Air Z falls back into > sleep-mode.

tank data tank data

Dive-mode: Activation: automatically, when depth more than 0.5 m. In dive-mode all diving functions are monitored: i. e. depth and dive time are displayed, maximum depth is stored, saturation of tissues is calculated with allowance for performance and temperature, nostop time or decompression prognosis is determined, ascent rate is controlled and displayed and the correctness of the decompression procedure is supervised.

Wait-mode: Activation: automatically on reaching the surface. The wait-mode is activated when the surface is reached after a dive. At the surface, the dive is not closed and entered into the logbook for an interval of 5 minutes. This allows a short surfacing for the purpose of orientation.
Surface-mode: Activation: automatically after a dive or when changing altitude. After a dive has been closed, Aladin Air Z is in surface-mode. All data belonging to the surface interval are calculated: Calculations are made on microbubble formation, on state of saturation of tissues after allowing for skin temperature and the assumed diver performance on the surface, on desaturation time and on no fly interval time.
In order to save energy, Aladin Air Z falls into the so called surface-sleep after 3 minutes. The functions of surface-mode are then carried out in the background. The atmospheric pressure is measured in surface-sleep once every minute. If the atmospheric pressure decreases, for example because of change of altitude, Aladin Air Z automatically switches from sleep-mode or from surfacesleep into surface-mode and displays the adaptation time. The adaptation time is the time after which all body tissues have adapted to the ambient pressure (= desaturation time).
Logbook-mode: Activation: manually by contacts Data of 19 past dives can be called up in the logbook-mode. It shows maximum depth, dive time, preceding interval*, altitude sections and, where appropriate, alarms. A dive is entered in the logbook if it has lasted more than 2 minutes. When the dive was a repetitive dive then it also shows the interval which has passed since the last dive or a preceding change of altitude. The last 37 dives and the last 200 minutes of dive-profiles can be downloaded out into a MemoMouse and later from there into a personal computer (Windows). * Preceding interval is only shown when the computer calculated that there was a residual nitrogen uptake at the beginning of the logged dive.
Diveplan-mode: Activation: manually by contacts The diveplan-mode assists the planning of a future dive. It allows planning of no-stop and decompression dives with freely determinable depth and dive time. On repeat dives, the surface interval time can also be chosen at will. Calculations are based on the temperature data of the last dive and assume a normal workload. SOS-mode: Activation: automatically If the diver remains above a depth of 0.5 metres for more than three minutes without observing the prescribed decompression, the computer switches into SOS-mode after the dive and displays <SOS> instead of the depth. The computer is locked from use for the next 24 hours. Desaturation is further calculated including microbubbles in the tissues. Diving is again possible after 24 hours, but the SOS-mode can influence the calculations of Aladin Air Z for three days after the incident due to the possible presence of microbubbles. If a diver using Aladin Air Z experiences a diving accident resulting in decompression sickness, the dive can be analyzed by means of the MemoMouse and DataTrak-software. An automatic program transmits the logbook data after connecting the dive computer via MemoMouse with a PC once a minute from the locked dive computer to the personal computer. Dive computer, MemoMouse and PC need to be connected. The PC has to be ready for receiving data and the DataTrak download-procedure has to be activated. Serious injury or death may result if a diver does not seek immediate treatment at a recompression chamber should any signs or symptoms of decompression sickness occur after a dive.

no-stop phase

decompression phase

D current depth A C

C 24min
B D dive time no-stop time
1.2 Display during decompression phase RBT: (Remaining Bottom Time) Time, for which the air supply is sufficient at the current depth, until ascent must be started. Decompression depth: Lowest stage is displayed. Decompression time: Prescribed duration of the decompression stop at the displayed decompression stage. Total ascent time to surface: Total ascent time including decompression stops.
(7min) total ascent time to surface

C 3m B

lowest decompression depth 2min decompression time
no-stop range decompression range

41.3 m

D RBT (26min)

Remaining Bottom Time

Aladin Air Z draws the divers attention to certain situations and also warns him of wrong actions. Attention messages and alarms are always optical and mostly acoustic under water, only optical at the surface except the decompression alarm. The acoustic attention messages (but not the alarms) can be switched off (see chapter VII Interface page 74). 2.1 Attention messages Attention messages are communicated to the diver optically by lit up symbols, letters or flashing figures. In addition, two short acoustic sequences can be heard (in an interval of 4 seconds) in two different frequencies. Attention messages come up in the following situations: 4 sec
Dive in mountain lake. On a change of altitude, the altitude section (0 - 3) and adaptation time is shown. See page 50 / 51. Remaining Bottom time less than 3 minutes. Start ascent.
End of no-stop phase. In order to prevent a decompression dive ascend a few metres.
No reception of air-data (interruption of transmission). If this message becomes frequent, check the position of the transmitter. See Mounting of transmitter on page 29 -30.
Out of breath warning (increased air consumption). Breathe more quietly, relax.
Warning of bubbles. Extension of the surface interval is recommended. See pages 49 and 68.
2.2 Alarms Alarms are given to the diver optically by flashing symbols, letters or figures and symbols. In addition, an acoustic sequence in one frequency can be heard during the whole duration of the alarm. An alarm occurs in the following situations:
Excessive ascent rate. Reduce ascent rate.
Ignoring decompression stop
Remaining bottom time zero (air too scarce) Amount of reserve air at the surface no longer certain. Start ascent at once!
Descend to the prescribed decompression depth at once!
2 Attention Messages and Alarms / 3 Preparation for the Dive

On any given dive, all divers in a buddy group must follow the most conservative dive computer for that particular dive. If the Aladin Air Z fails at any time during the dive, the dive must be terminated, and appropriate surfacing procedures should be initiated immediately. You MUST follow the ascent rates as indicated by the Aladin Air Z and if the computer should fail for any reason, you must ascend at a rate of no greater than 10 metres per minute. You MUST be familiar with all signs and symptoms of decompression sickness before using the Aladin Air Z! 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. Always observe the visual and acoustic alarm signals of the Aladin Air Z. Avoid situations of increased risk which are marked with a warning sign in this operating manual. Avoid repeated ascents and descents (yo-yo diving). Avoid exertion at depth Plan shorter duration for dives in cold water After completion of the decompression or at the end of no-stop dives, ascend the last metres to the surface very slowly. Ensure that you have enough Air for the Ascent. Do not use the RBT to the limit if prolonged ascents or an increased rate of breathing (currents) are expected. 1.3 Minimizing risks on repetitive dives There is still excess nitrogen in the body due to the history of the preceding dives. Depending on the duration of the surface interval, there may even be gaseous nitrogen (microbubbles). You can minimize the risk by observing certain rules: observe the same rules for repetitive dives as on your first dive plan repetitive dives at a smaller depth than the first dive plan a sufficient duration of the surface interval (min. 3 - 4 hours) only go on repetitive dives, if no indication <Atn> is visible on the display plan a day without diving once a week repetitive dives after exchanging the dive computer: Wait at least 24 hour before you start with the repetitive dive.
1.4 Action in risk situations If the dive includes a risk situation, Aladin Air Z reacts automatically and appropriately to the situation. A change of decompression is indicated if it is actually necessary to minimize the risk. The diver can further reduce the risk through sensible conduct on the next dive and at the same time prevent long decompression stops. A few examples on the following pages: Situation 1: Reaction of computer: The diver ascends much too rapidly: The model calculates the formation of bubbles due to the excessively rapid ascent. No-stop time is shortened or a longer (and eventually at greater depth) decompression prescription is displayed in order to assure sufficient decompression.

Recommended action of the diver During the dive: Observe the new decompression instruction of Aladin Air Z.

After the dive:

Watch out for symptoms of an arterial gas embolism and decompression sickness. Before the next dive, plan a sufficiently long interval (display <Atn> should have disappeared).

Situation 2:

The diver disregards the prescribed decompression depth for some time. The model calculates the formation of bubbles due to ignoring decompression. A longer (and eventually at lower depth) decompression is displayed in order to assure sufficient time for desaturation.

Reaction of computer:

Recommended action of the diver During the dive: Descend to the prescribed decompression depth at once. Do not descend to greater depths any more. Observe the decompression instruction of Aladin Air Z.
Watch out for symptoms of arterial gas embolism and decompression sickness. Before the next dive, plan a sufficiently long interval (display <Atn> should have disappeared).
Situation 3: Reaction of computer: The diver is exposed to exertion for a long period (e.g. in a current). An extension of the decompression is indicated, if the muscle tissues are relevant for the decompression of the dive.
Recommended action of the diver During the dive: Avoid further physical exertion if possible. Make a break for relaxation. Check the decompression information and the RBT frequently on your Aladin Air Z. Decompression time can increase and RBT can decrease considerably. Refrain from intense physical exertion on your next dive. In addition, a longer surface interval can shorten the decompression of the next dive. It is impossible to have a sufficient surface interval so that the indication <Atn> would extinguish prior to the next dive (e.g. on organized diving trips from a boat). Aladin Air Z calculates a more conservative no-stop time or decompression prescription in order to allow nitrogen in the vicinity of bubbles enough time for desaturation.

Situation 4:

Recommended action of the diver During the dive: Be careful to have a profile 'low in bubbles' on your next dive (limit depth to 25 m max., slow ascent). Before the next dive, plan a sufficiently long interval (display <Atn> should have disappeared).

V Logbook

5 Survey Selection and Activation Selection of Dive Leaving Logbook-Mode Output on PC
_________________________________________60 _________________________________________61 _________________________________________62 _________________________________________63 _________________________________________64

V Uwatec Aladin Air Z

1 Survey
The Aladin Air Z records the last 37 dives and the dive profiles of the last 200 minutes of diving (see Output on PC page 64). The last 19 dives can be displayed directly on the dive computer. A dive is only entered in the logbook if the dive time is longer than 2 minutes. Displayed information of the dive:

alarms during the dive

altitude sections if any maximum depth

dive number

air consumed during this dive out of breath warning made during the dive
duration of surface interval (only with repetitive dives)

dP=differential pressure

If a dive is started within adaptation time (after a change of altitude), the adaptation time is displayed instead of the surface interval.
2 Selection and Activation
1. The logbook is selected by bridging contacts B and + in ready- or surface-mode. Indication <LOGBUCH> appears. If Aladin Air Z has been in surface-mode before, the surface interval appears as well. You go back into ready- or surface-mode by B and.
2. In order to activate the logbook, bridge contacts B and E. The most recent dive is displayed (DIVE 1).

3 Selection of Dive

1. Bridge contacts B and + to get the information of the dive preceding the most recent one. Display <DIVE 2> appears.
2. On every further bridging B and + the logbook jumps to the next older dive (DIVE 3).
3. On constant bridging of the contacts all dives are displayed successively.
4. Bridging contacts B and effects switching back from older dives to more recent ones.
4 Leaving the Logbook-Mode
Touch contacts B and E. Aladin Air Z switches back into ready- or surfacemode. This also happens 3 minutes after activating logbook-mode.

5 Output on PC

By means of a PC-interface and the DataTrak software, both available as an accessory, the information of the last 37 dives can be read out. In the same way, the dive profiles of the last dives, up to a total of 200 minutes, can be reproduced. Time and date of the dive are entered automatically, based on the clock of the PC-system when the data are transferred via interface. The possibilities and the procedure of this data transfer are described in a separate manual.

VI Dive Planer

Survey Selection and Activation from Ready-Mode Selection and Activation from Surface-Mode Planning a No-Stop Dive Planning a Decompression Dive Leaving the Dive-Plan-Mode
_________________________________________66 _________________________________________66 _________________________________________67 _________________________________________68 _________________________________________70 _________________________________________71

VI Uwatec Aladin Air Z

1 Survey / 2 Selection and Activation from Ready-Mode
The Aladin Air Z is equipped with a dive planner which allows the planning of no-stop and decompression dives with freely determinable surface intervals. The water temperature of the most recent dive and altitude sections are incorporated in the calculation.
Presetting the surface interval (only during desaturation)
Planning of no-stop dives
Planning of decompression dives
2 Selection and Activation from Ready-Mode
max. depth max. depth deco info max. depth deco info
1. From ready-mode, you switch into the dive-plan input stage with contacts B and.
2. The display shows <DIVEPLAN>. You return to ready-mode by B and +.
3. Contacts B and E afterwards activate the planning mode.
4. The display shows no-stop times for increasing depths (scrolling no-stop times).
3 Selection and Activation from Surface-Mode
1. From surface-mode, you switch into the dive-plan input stage by B and.
2. The display shows <DIVEPLAN>. You return to surface mode by B and +.
3. After confirming by B and E, the display shows <Add>, <Int> and the interval (flashing). Aladin Air Z expects your input for the duration of the dive interval.
4 Planning a No-Stop Dive
Aladin Air Z expects your input for the duration of the dive interval.
4a If no surface interval is to be entered, (diving at the present moment), confirm this with contacts B and E, and you switch into no-stop planning. 4b You can extend the interval with contacts B and +. B and shorten the interval.
5 You confirm the new interval with B and E and get to no-stop planning. After confirming the surface interval (if possible), no-stop times are displayed in 3-metre-increments. The process starts at the deepest depth where the nostop time is for the first time less than 99 minutes. The no-stop time for every 3-metre-increment is displayed for about 3 seconds (scrolling no-stop times). The Aladin Air Za calculates according to the planned surface interval the expected production of microbubbles. The diver should increase the surface interval if <Atn> (Attention) is displayed. This will reduce the risk of micro bubble production in the pulmonary system.

VIII Trouble Shooting

1 Trouble Shooting
________________________________________ 76

VIII Uwatec Aladin Air Z

symptom No reception of tank pressure data. possible reason(s) Transmitter and computer are not tuned to each other (paired). Transmitter or receiver in the computer are defective. procedure(s) Pair transmitter and computer (see chapter II 4). If the pairing is not possible with another transmitter, the receiver in the computer is defective. Have transmitter or dive computer repaired. Change the pressure by breathing from the regulator. Tank data will reappear. Mount transmitter correctly (see chapter II 4) If the pairing is not possible with another transmitter, the receiver in the computer is defective. Have transmitter or dive computer repaired. Make comparison at 20 C or check the tank pressure compensated to the atmospheric pressure for comparison (see appendix, chapter IX).
In surface mode if there is no decrease in pressure for 3 minutes the pressure data will not display. Bad reception of tank pressure data. Transmitter is not mounted correctly. Transmitter, or receiver in the computer are defective.
Displayed tank pressure does not correspond to pressure measured by a manometer (pressure gauge).
By compensating the temperature, the pressure displayed is valid at 20 C. If air- or water-temperature differ from this value, a difference to the value given by a pressure gauge is possible. Tank and transmitter do not have the same temperature (only possible in air). Manometer/pressure gauge is not accurate (temperature 20 C).
Leave the tank with the regulator mounted in the open air for 5 -10 minutes. Measure tank pressure with another manometer/pressure gauge (at 20 C).
symptom The logbook does not show any air consumption (dp) for a certain dive. Altitude section does not correspond to the current altitude. possible reason(s) No tank pressure signal was received at the beginning or end of the dive. Transmitter and dive computer were not paired before the dive started. Atmospheric pressure is especially high or low. Air pressure measured by the computer is wrong. procedure(s) Mount transmitter correctly (see chapter II 4). Pair transmitter and computer (see chapter II 4).

Take the dive computer or the transmitter to an authorized Uwatec dealer in order to change the batteries. The actual change of the batteries is made at the manufacturer or the importer. The computer is checked for its technical functioning at the same time. Do not attempt to have the batteries changed by anyone other than an authorized dealer.

2 Technical Information

Operating altitude: with decompression information: without decompression information:
sea level up to approx. 4000 m unlimited

Operating depth:

no limitation in the permitted range of diving with compressed air no limit for recreational dives. Do not dive deeper than 40 m.
Maximum operating pressure: 13 bar Clock: Power supply: Life of the battery: quartz timer, display up to 199 minutes Special battery Uwatec LR07 (standard values) For an average diving time of 60 minutes and a surface interval of 20 hours after every dive: Number of dives per year dive computer (years) 7 5.2.5 transmitter (years) 11 9.6 Operating temperature: -10C to +50C
3 Conversion of Tank Pressure
Tank pressure indicated in the lower display may diverge from the information given by a manometer/pressure gauge. Aladin Air Z displays pressure always converted to a temperature of 20 C, whereas the mechanical pressure gauge displays the actual pressure influenced by temperature. The figure on the right allows you to compare the information given by a conventional pressure gauge and by Aladin Air Z at six different temperatures.
Display pressure gauge 150
35o C 30o C 20o C 10o C 5o C 0o C

230 bar

Display Aladin Air Z

4 Warranty

Please pay attention to the following remarks on warranty claims: 4.1 Recognition of warranty: 4.2 Scope of the warranty:
The warranty only covers dive computers, which have been provably bought from an authorized retailer or from the manufacturer. The manufacturer undertakes to rectify all defects which are provably traceable to defects of material or faults in production. The manufacturer decides about the qualification of a warranty claim and about the way of mending possible defects. This may be by repair of the computer free of charge, the replacement of faulty parts or replacement of the entire computer. Excluded are faults or defects which go back to: Unqualified operation or strain Exterior influences, e.g. transport damages, damages due to bumping and hitting, meteorological influences or other natural phenomena. Servicing, repairs or the opening of the dive computer by anybody not authorized by the manufacturer. This especially concerns the change of batteries of both the transmitter and the dive computer. Pressure tests which do not take place in water Diving accidents

4.3 Warranty period and claim
The warranty is given for a period of 12 months. Repairs or replacements during the warranty period do not extend the original warranty period. In order to put forward a warranty claim, send the dive computer together with a dated receipt of the purchase to your authorized retailer or an authorized servicing point. The manufacturer does not have to accept extensions of the warranty granted by national importers.

5 Safety considerations

The Aladin Air Z offers a high measure of comfort and safety to the diver but the dive computer does not replace a profound dive training. Pay strict attention to the optical and acoustic alarm signals emitted by Aladin Air Z. Avoid risk situations, which are marked or in this manual. Always observe the basic diving rules, which are also valid when diving with Aladin Air Z: Never dive alone Aladin Air Z does not replace a diving partner! Always dive according to your level or training. Aladin Air Z does not increase your abilities as a diver! Due to the danger of nitrogen narcosis, do not dive lower than 40 metres. Aladin Air Z does not warn you in this respect. The safety concept of Aladin Air Z includes this extensive operating manual. Confirm with your signature below that you have read this operating manual carefully and completely.
Place: ________________ Date: ______________
Signature: ____________________
5 Serial No. / Dealer address
Serial No. of your Aladin Air Z
Printed in Switzerland 1/00

Dealer address:

(Dealer to affix stamp)

Z Nitrox

Supplement to Aladin Air Z manual
The Aladin Air Z Nitrox diving computer has been designed for diving on Nitrox (oxygen/ nitrogen mix with a max. of 50% O2 ) and air (21% O2). The diving computer displays the level of oxygen toxicity (CNS O2 %) and gives out warnings on oxygen toxicity and on high oxygen partial pressure (ppO2). Without exchanging the diving computer a diver can dive on different mixtures (Nitrox and compressed air) during the day. Using the dive planner a diver can determine the best mix for a certain maximum depth and/ or find out the maximum operation depth (MOD) for a given mix.

Nitrox Information

The selected percentage of oxygen (O2% Mix) is displayed on the surface and during the first five minutes of a dive, until a first maximum depth is reached, which will then be displayed. After the dive the display of oxygen percentage and maximum depth will alternate for a five-minute-waiting-period (Wait-Mode). The danger of oxygen toxicity symptoms increases as the shown oxygen toxicity percentage (CNS O2% LIMIT) approaches 100%.

O2 % MIX

max. depth

max. depth max. de

CNS O2 LIMIT
The figures for the set maximum allowable partial pressure of oxygen (ppO2 max) will not be shown. However, the Aladin Air Z Nitrox warns the diver as soon as he reaches the depth in which the maximum allowable partial pressure of oxygen will be reached.
Setting the gas mixture (O2% Mix)
Bridge and then to switch from ready- or surface-mode to the O2%-mix-mode (Add). Bridge and to select a level of O2 between 21% and 50% (2% steps). Bridge to confirm your entry. If you do not confirm your entry the O2%-mix-mode will turn off automatically after 3 minutes and your entry will not be accepted!

Dive Planner

Press 2x and 1x to activate your dive planner. The oxygen toxicity is not taken into account by calculations of the dive planner. Planning a No-Stop Dive The dive planner will only display depths which lie within the limits of the maximum allowable partial pressure of oxygen (ppO2 max). Planning a Nitrox-dive The dive planner of the Aladin Air Z Nitrox always plans dives based on the selected oxygen percentage. It can be used to: Calculate the maximum depth (MOD, Max. Operation Depth) to be reached with a given mixture. Calculate the necessary mixture (Best Mix) for a dive with a given depth. Calculating the Max. Operation Depth (MOD) Set the desired percentage of oxygen and activate the dive planner as described on page 66/67 of the Air Z manual. Observe the depth indications and memorize the greatest depth displayed. This is your maximum depth for a dive with the set mixture and the set maximum partial pressure of oxygen. Calculating of the mixture for a given depth (Best Mix) Activate the dive planner (Air Z page 66/67) and observe the maximum depth displayed. If the desired depth is not reached or exceeded, leave the dive planner, alter the percentage of oxygen and return to the scrolling no-stop times. Repeat this procedure until the desired depth appears as the maximum depth. The ideal percentage of oxygen for this depth will now be displayed in the ready-mode.
Uwatec Aladin Air Z Nitrox
Nitrox Attention messages

and Alarms

Partial pressure of oxygen reaches limit (->ppO2 max) Messages: If the partial pressure of oxygen reaches the set value, the Ala4 sec din Air Z Nitrox gives an acoustic warning and the depth indication is flashing. depth Response: Ascend to a lower depth in order to diminish the danger of oxygen toxicity. Observe <CNS O2%-value> carefully.

S L O W

<CNS O2%-value> reaches 75% Messages: An acoustic signal can be heard, the symbol <CNS O2 LIMIT> 4 sec flashes continuously.

depth d

Response: Avoid a further increase by beginning the ascent.
<CNS O2%-value> reaches 100% Oxygen toxicity reaching 100% can lead to dangerous neurological symptoms. depth dive time
Messages: A visual alarm appears and an acoustic warning can be heard every 4 seconds. The CNS O2%-value and its symbol are flashing. Response: Ascend immediately until the buzzer stops (ppO2 is then less than 0.5 bar). If the ascent speed is displayed and if the CNS O2 % value does not increase anymore (due to a lower partial pressure of oxygen), the acoustic warning will be suppressed.
Operating scheme for surface functions

Sleep Surface Sleep

Input stage

DIVEPLAN

(or 3min)
Ready or Surface automatically

(or 3m

LOGBOOK

min) (or 3 c 3 se

5 sec.

Battery capacity

dive time

DO NOT FLY LOGBOOK

NO STOP

tank data

deco info

English

Oxygen toxicity (CNS O2% LIMIT) Oxygen toxicity is calculated on line as a function of depth values and the preset gas mixture. 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 CNS O2 status will only be displayed if higher than 5%. During the ascent the display of the oxygen toxicity is replaced by the ascent rate. See also ->Nitrox. Maximum allowable partial pressure of oxygen (ppO2 max) The higher the percentage of oxygen in the used mixture, the sooner you will reach the limit of your allowable dive depth, as defined by your partial pressure of oxygen (ppO2 max) settings. The maximum partial pressure of oxygen can be adjusted with the DataTalk Software between 1.20 and 1.95 bar. Standard value is 1,5 bar. A ppO2 of more than 1.6 bar should not be set for safety reasons and is not recommended. The CNS O2%-value and -alarm is not influenced by the selected ppO2 max. - setting. Partial pressure of oxygen (ppO2) The set value and the information about the actual ppO2 are not displayed. See -> Maximum allowable partial pressure of oxygen. Surface-mode In the surface-mode the dive computer measures the build-up of micro gas bubbles and the nitrogen saturation als well as the oxygen toxicity of the tissue. The desaturation time is determined either by oxygen- or nitrogen saturation, depending on which gas takes longer. Oxygen saturation <CNS O2 %> is displayed and adjusted until the value declines to 0%. For calculations of the desaturation and No Fly Time it is assumed that the diver inhales air. Wait-mode If you need to change cylinders in this phase, make sure that the new mixture is exactly the same as the one previously used. If you want to dive with another mixture, you must have a 5-minute break at the surface to allow the Aladin Air Z Nitrox to conclude the dive. You can then adjust the settings to the new mixture. Disregarding these rules causes the Aladin Air Z Nitrox to calculate with wrong mixture data. This can lead to injury or death. Nitrox Nitrox is a gas mixture consisting of nitrogen and oxygen. The kind of air used for diving with compressed air is the same as the normal air of the earths atmosphere (78% nitrogen, 21% oxygen and 1% inert gases). Therefore, normal air is also Nitrox! However, Nitrox as a breathing gas for diving contains a higher percentage of oxygen than normal air. A higher percentage of oxygen (and therefore a reduced amount of nitrogen) has the advantage of lengthening the nostop phase (or reducing the decompression phase), since less nitrogen is dissolved in the divers body during the dive. The higher percentage of oxygen in the Nitrox-mixture can cause additional physiological problems because of the toxic effects of a hightened partial pressure of oxygen (ppO2). When breathing oxygen at a higher partial pressure, two kinds of oxygen toxicity can occur: CNS damages: Symptoms of intoxication can occur at short notice in the central nervous system (CNS). Such symptoms are: irritation of the respiratory organs, sickness, headache, pulmonary oedema, cramps, unconsciousness. The symptoms can occur at a ppO2 of essentially more than 1 bar and they depend on the length of exposure and on the partial pressure of oxygen. Damages of the lungs: Symptoms of pulmonary intoxication are long-term effects and may not accur immediately. The symptoms can occur at ppO2 rates from 0.5 bar and higher and due to long time exposure in the range of several hours/ days. Aladin Air Z Nitrox considers the short term toxic effects of oxygen (CNS damages) by means of the so called "oxygen- clock". It is based on a list which shows the units of toxicity for oxygen per unit of time and is dependent on the ppO2. The indication of toxicity is shown as "CNS O2 %" (= relative toxicity of oxygen for the central nervous system). CNS O2 = 0% reflects a normal physical state before the first dive, CNS O2 = 100% reflec-

ts the critical upper limit. The list, initially published by the US Navy, is nowadays known as the IANTD- list. We modified this list for the use with Aladin Air Z Nitrox in cooperation with Dr. Bill Hamilton, Hamilton Research Ltd. (Tarrytown, NY), a well-known specialist. Since long term oxygen intoxication is almost irrelevant for diving with independent diving equipment it is therefore not considered in the calculations of Aladin Air Z Nitrox.

Safety Considerations

The Aladin Air Z Nitrox is designed for dives with Nitrox (max.50% O2) and compressed air (21% O2) only. Do not use the Aladin Air Z Nitrox for dives with other breathing mixes. It is essential to check the O2 settings of your computer before each dive and to compare them with the gas mixture you are using. Always remember: Wrong mixture settings can result in insufficient calculations of decompression time and oxygen-toxicity, which can be fatal! The danger of nitrogen narcosis must always be taken into consideration, regardless of the gas mixture you are using. The Aladin Air Z Nitrox gives no warning about this. Always check the diving limits considering the oxygen content and standard sports diving procedures. Do not dive deeper than 40 metres (130 feet). If the CNS O2 status reaches 75% you must ascent immediatly! Only dive with Nitrox after you have been thoroughly instructed by a recognised institution. When diving with Nitrox only use components that have been authorized for diving with Nitrox equipment. Only use Aladin Air Z Nitrox with open breathing systems. Aladin Air Z Nitrox must be set for a determined gas mixture. In semi-closed and closed systems the gas mixture can vary considerably. The calculations may yield results different from those necessary for the actual mixture. Only use Aladin Air Z Nitrox for diving with an independent breathing apparatus. Aladin Air Z Nitrox is not designed for long-term exposure to Nitrox. Make sure your surface interval is long enough (just like diving with compressed air). Oxygen, too, needs sufficient time to leave the body. Do not start your next dive before your CNS O2 % status has dropped below 40%.
This operating manual makes use of the following icons to indicate especially important comments: Remarks: Informations and tips which are important for optimal use of the functions of your Aladin Air Z Nitrox. Informations and tips which are important for optimal use of the functions of your Aladin Air Z Nitrox.

Attention:

Danger!
Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
December 2000, Copyright by Uwatec Switzerland

Dealer address:

(Dealer to affix stamp)

Printed in Switzerland 12/00