Dive Computer Owner's Manual I550c

i550C (P/N's NS117121 - NS117126) Dive Computer Owner's Manual

NOTICES

LIMITED TWO-YEAR WARRANTY or arrant etail an to regiter our rouct, reer to .aqualung.co.

COPYRIGHT NOTICE i oner anual i corigte, all rigt are reere. It a not, in ole or in art, e coie, otocoie, rerouce, tranlate, or tranerre to an oter or itout rior conent in riting ro Aqua Lung International, Inc.

TRADEMARK, TRADE NAME, AND SERVICE MARK NOTICE Aqua Lung, te Aqua Lung logo, i0, te i0 logo, a ie eaining (), ier elaceale atterie, raic ier Interace, reie lanning equence (), et oint, ontrol onole, urn a Alar, an Aqua Lung couter Interace (ALI) are all regitere an unregitere traear, trae nae, an erice ar o Aqua Lung International, Inc. All rigt are reere.

PATENT NOTICE .. atent ae een iue to rotect eign eature o our rouct. e lit o atent iue an ening are aailale at ieatent.co.

DECOMPRESSION MODEL e rogra itin te i0 iulate te aortion o inert gae into te o uing a ateatical oel. i oel i erel a a to al a liite et o ata to a large range o eerience. e i0 ie couter oel i ae uon te latet reearc an eerient in ecoreion teor. till, uing ti ie couter, ut a uing an oter o ecoreion ale, i no guarantee o aoiing ecoreion icne, i.e. te en. er ier iolog i ierent, an can een ar ro a to a. o acine can predict how your body will react to a particular dive profile.

DANGERS, WARNINGS, CAUTIONS, AND NOTES a attention to te olloing ol en te aear trougout ti ocuent. e enote iortant inoration an ti.

! DANGERS: are indicators of important information that if ignored would lead to severe injury or death.

! WARNINGS: are indicators of important information that if ignored could lead to severe injury or death.

! CAUTIONS: indicate information that will help you avoid faulty assembly, leading to an unsafe condition.

NOTES: indicate tips and advice that can inform of features, aid assembly, or prevent damage to the product.

RESPONSIBLE COMPUTER DIVING

Ala lan eac ie. Ala liit our ie to te leel o our training an eerience. • Always make your deepest dive first. • Always make the deepest part of every dive first. ec our couter oten uring te ie. o a aet to on eer ie. Allo aequate urace interal eteen eac ie. Allo aequate urace interal eteen eac a o iing (12 our or until our couter clear). ea an unertan ti anual torougl eore uing te i0.

Responsible

! WARNINGS:

• This manual is to be used in conjunction with the Aqua Lung Dive Computer Safety and Reference Manual, Doc. 12-7835. It contains general safety warnings and recommendations for use of this product. • The i550C is intended for use by recreational divers who have successfully completed a internationally recognized course in scuba diving (for air use) and diving with enriched nitrogen- oxygen (nitrox) breathing gas mixtures (for nitrox use). • It must not be used by untrained persons who may not have knowledge of the potential risks and hazards of scuba diving and diving with enriched nitrogen-oxygen (nitrox) mixtures. • You must obtain scuba certification in diving with enriched nitrogen-oxygen mixtures (nitrox) before using the i550C for nitrox diving. • Before using this product for military or commercial applications, read the recommendations, limitations, and warnings for such use. They can be found at http://www.aqualung.com/ militaryandprofessional/. • As with all underwater life support equipment, improper use or misuse of this product can cause serious injury or death. • Never participate in sharing or swapping of a dive computer. • Conduct your dives in such a manner so as to insure that you continuously check the computer's proper function. • Read and understand this owner’s manual completely before diving with the i550C. • If you do not fully understand how to use this dive computer or if you have any questions, you should seek instruction in its use from your authorized Aqua Lung dealer before you utilize this product. • If your i550C stops working for any reason while operating, it is important that you have anticipated this possibility and are prepared for it. This is an important reason for not pushing the tables, oxygen exposure limits, or entering decompression without proper training. If you dive in situations where your trip would be ruined or your safety would be jeopardized by losing the use of your i550C, a backup instrument system is highly recommended. • Each numeric and graphic display represents a unique piece of information. It is imperative that you understand the formats, ranges, and values of the information represented to avoid any possible misunderstanding that could result in error. • Remember that technology is no substitute for common sense. The dive computer only provides the person using it with data, not the knowledge to use it. Remember also that the dive computer does not actually measure and test the composition of your body tissue and blood. Using an Aqua Lung dive computer, just as using any other Decompression Tables, is no guarantee of avoiding decompression sickness. Every diver’s physiology is different and can even vary from day to day. No machine can predict how your body will react to a particular dive profile. • Diving at high altitude requires special knowledge of the variations imposed upon divers, their activities, and their equipment by the decrease in atmospheric pressures. Aqua Lung recommends completion of a specialized altitude training course by a recognized training agency prior to diving in high altitude lakes or rivers. • Repetitive dives in a series should only be conducted at the same altitude as that of the first dive of that series. Repetitive dives made at a different altitude will result in an error equal to the difference in barometric pressure, and possibly a false dive mode with erroneous data. • If the i550C is activated at an elevation higher than 4,270 m (14,000 ft), it will immediately shutdown. • Decompression diving or diving deeper than 39 m (130 ft) will greatly increase your risk of decompression sickness. This should only be attempted by those properly trained and certified in decompression diving. It is important to completely understand the features, functions, and specifically the limitations of the i550C. Based on this the diver must decide if the i550C is suitable for the dive activities and dive profiles being planned. • Using an i550C is no guarantee of avoiding decompression sickness. • The i550C enters Violation Mode when a situation exceeds its capacity to predict an ascent procedure. These dives represent gross excursions into decompression that are beyond the boundaries and spirit of the i550C's design. If you are following these dive profiles, Aqua Lung advises that you should not use an i550C.

• If you exceed certain limits, the i550C will not be able to help you get safely back to the surface. These situations exceed tested limits and can result in loss of some functions for 24 hours after the dive in which a violation occurred.

EUROPEAN UNION REGULATIONS:

• EC type examination conducted by: SGS United Kingdom Ltd, Weston - super - Mare, BS22 6WA, UK, Notified Body No. 0120. • HP gas pressure sensing components are in conformity with EN250:2014 - Respiratory equipment - open-circuit self-contained compressed air diving apparatus - requirements, testing and marking – clause 6.11.1 Pressure Indicator. EN 250:2014 is the standard describing certain minimum performance requirements for SCUBA regulators to be used with air only sold in EU. EN250:2014 testing is performed to a maximum depth of 50 M (165 FSW). A component of self-contained breathing apparatus as defined by EN250:2014 is: Pressure Indicator, for use with air only. Products marked EN250 are intended for air use only. Products marked EN 13949 are intended for use with gases containing more than 22% oxygen and must not be used for air. • Depth and time measurements are in conformity with EN13319:2000 - Diving Accessories - depth gauges and combined depth and time measuring devices • The air used must comply with EN 12021. EN 12021 is a standard that specifies the allowable contami- nates and component gasses that make up compressed air. This is the equivalent of the USA Com- pressed Gas Association’s Grade E air. Both standards allow very small amounts of contaminants that are not harmful to breathe, but can cause a problem if present in systems using gasses with a high percentage of oxygen. • Electronic instruments are in compliance with Directive 2004/108/EC Electromagnetic compatibility (EMC) EN 61000 part 6-1: Generic Standards - immunity for residential, commercial and light-industrial environments • In accordance with EU regulation 2016/425, may it be known that Pelagic as manufacturer of this product issues a Declaration of Conformities, available here http://www.pelagicnet.com/dc

! CAUTION: Transmitters and gas integrated dive computers marked EN 250 are certified for use with air only. Trans- mitters and gas integrated dive computers marked EN 13949 are certified for use with Nitrox only.

CONTENTS

I 2 I 2 IL II 2 0 AI I 0 (IAL ) 1 GETTING STARTED 7 AI 8 DIVE OPERATION 32 AIAI 8 IIIAI A I ILA I I I AI 10 I AL 1 I 11 I AL 2 I DIVE FEATURES 12 AI (I I AII) 1 A AI I 1 AI 2 I ( I AII) 1 A I A A 1 I A A A 1 I 8 2 A A 1 I 8 ALI 1 I AI 8 (AI A) 1 (IIAL ILAI) ( ) 1 1 (LA ILAI 1) (A ) 1 2 (LA ILAI 2) 0 L A IL A 1 (LA ILAI ) 0 L A I A I 1 ILAI A I A I 0 AIL ALA 1 ILAI A A 1 I 2 1 DIVE SURFACE MODE 17 Alar 1 2 uring ecoreion 1 A A I 18 I 2 A ( AAI) 2 I AI 18 arning 2 AL 1 (LA) 18 Alar 2 AL 2 1 arning uring ecoreion 2 AL 1 Alar uring ecoreion 2 LA (A) 1 Alar n urace LA 20 L 20 GAUGE MODE 44 A 21 AL (ALA) 2 A A I 1. A AL (Auile Alar) 2 A AI 2. AL (Auile Alar) 2 IIIAI A I . t AL (lae ie ie Alar) 2 A I AI . 2 AL (itrogen Alar) 2 A I AL 1 . tr AL (ie ie eaining Alar) 2 (LA ILAI ) . AL (urn reure Alar) 2 . AL (reure Alar) 2 REFERENCE 48 IL (ILII) 2 LAILAI AA 1. 2 (ater e) 2 A A LAI 2. 2 A (ater Actiation) 2 I . I (I) 2 A LA 0 . 2 ALI I A A 1 . (A ) 2 I I (IAL) 2 . (oneratie actor) 2 . Lt (luetoot ounication) 28 TECHNICAL DATA 53 8. LIt (ALI) AI 28 I I LII . (AL A) 2 LII

ALI LL IIAI AIAI 8 AA L II 8

GETTING STARTED

BASICS elcoe to our ne i0. e i0 i an ea to ue ie couter utiliing a to utton interace. ier a cooe eteen eiter ie or auge oe. oug te i0 i ea to ue, ou ill get te ot out o our ne i0 i ou tae oe tie to ailiarie ourel it it ila an oeration. Inoration a een organie into ea to ollo ection to ai ou in learning all ou nee to no. ere i alo a gloar at te en o ti guie or an ter tat a oun unailiar.

ACTIVATION o actiate te i0, re an releae eiter utton. e i0 ill alo turn on i it etal contact ecoe et an ou ecen greater tan 1. ( t) or econ. e 2 A (ater actiation) eature a e iale i tat i our reerence. ialing te 2 A eature i ecrie in te ie urace oe cater, . 2.

on actiation te unit ill enter a iagnotic oe. e i0 cec te ila an oltage at ti tie to enure tat eerting i itin tolerance. It ill alo cec aient aroetric reure, an calirate reent et a 0 (t). en at 1 (001 t), or iger, it ill aut et or te iger altitue. Ater te iagnotic cec, te i0 ill ila te urace creen in ie oe.

NOTE: The i550C has no off button or command. If no buttons are pressed or dives made within 10 minutes the computer will enter Sleep Mode. The screen and Bluetooth (if set ON) shut down, to save battery life, while in Sleep Mode. To wake the computer press any button. Additionally, the unit will completely shut itself off after 2 hours of inoperation. However, the i550C will stay on, in Sleep Mode, for a 24 hour period after the dive, counting down FLY (time to fly) and SAT (desaturation time) if a dive has been made.

DISPLAY ICONS

7 8 1

6 9 10 5

3 11 2

1 12

18 13 17 16 14 15

1 et I (unit) 10 gen aturation 2 artial reure o gen 11 raction o gen ee to 12 ie o urace aet to 1 eerature a ie eaining 1 ie ie or ie ecoreion to riggere 1 urace ie ecen, Acen, or to 1 a 8 Lo atter 1 alue i reure alue i aiu 18 luetoot (on)

ADV

SEL

BUTTONS e i0 utilie 2 control utton calle te A (Aance) an L (elect) utton. e allo ou to elect mode options and access specific information. They are also used to enter settings, activate the backlight, and acnolege te auile alar. rougout ti anual te ill e reerre to a te A an L utton.

reing ierent coination o tee utton ill naigate troug ierent enu an otion o te i0. e ol in te tale elo ill illutrate o to rocee troug te enu.

SYMBOL MEANING PRESS BUTTON LESS THAN 2 SECONDS

HOLD BUTTON GREATER THAN 2 SECONDS

BUTTON FUNCTIONS

ACTION BUTTON FUNCTION Press Any Button to activate the i550C ADV or

SEL

to access Alt screens ADV to advance or step through menus

ADV to toggle or change setpoints

to activate the backlight

SEL

to scroll quickly, changing setpoints ADV to scroll quickly through menu lead-in screens (selections) ADV

SEL

to select, access, step forward through selections, or SEL save a setting

ADV to activate the backlight during a dive

SEL

to activate the backlight on the surface SEL

ADV

SEL

to exit a menu directly to the main screen ADV

ADV +

SEL SEL

DIVE FEATURES

DTR (DIVE TIME REMAINING) e i0 contantl onitor o ecoreion tatu an 2 Accuulation, an ill ila iceer tie i te leat aount aailale a on te o ecoreion ie ain creen. e tie eing ilae ill e identified by the NO DECO or O2 MIN icons.

NO DECOMPRESSION o ecoreion i te aiu aount o tie tat ou can ta at our reent et eore entering e coreion. It i calculate ae on te aount o nitrogen aore otetical tiue coartent. e rate eac o tee coartent aor an releae nitrogen i ateaticall oele an coare againt a aiu alloale nitrogen leel.

iceer coartent i cloet to ti aiu leel i te controlling coartent or tat et. It reult ing alue ( ) ill e ilae a . It ill alo e ilae graicall a te 2 ar ra, ee ar ra elo.

A ou acen, te 2 ar ra egent ill recee a control it to loer coartent. i i a eature o te ecoreion oel tat i te ai or ultileel iing, one o te ot iortant aantage tat Aqua Lung ie couter oer.

O2 MIN (OXYGEN TIME REMAINING) en et or nitro oeration, 2 A (gen aturation) uring a ie i ilae on an AL creen a a percentage of allowed saturation identified by the O2 SAT icon. The limit for O2 SAT (100%) is set at 300 OTU (Oxygen Tolerance Units) per dive or 24 hour period. See the chart at the back of this manual for specific times an alloance. 2 A an 2 I alue are inerel relate a te 2 A alue increae te 2 I alue ecreae.

en te 2 I alue ecoe le tan te o ecoreion calculation or te ie, (ie ie eaining) ill e controlle 2 A an te 2 I alue ill e ilae a te on te ie ain screen, identified by the O2 MIN icon. ALT 2 DIVE MAIN

i 2 I

% O2 aturation

BAR GRAPHS The i550C features two specific bar graphs. 1. e one on te let rereent acent rate. It i reerre to a A ar ra. 2. e one on te rigt rereent nitrogen loaing. It i reerre to a te 2 ar ra.

itrogen Loaing Acent ate

ASC BAR GRAPH e A ar ra roie a iual rereentation o acent ee (i.e., an acent eeoeter). en te ascent is faster than the recommended 9 mpm (30 fpm), all segments will flash and the air pressure will temporar il e relace it te eage L.

ASC ALARM TRIGGERED # OF SEGMENTS ASCENT RATE, MPM (FPM) 0 0 (0 10) 1 .1 . (11 1)

2 . (1 20) flashing .1 . (21 2) . (2 0) ( 0)

N2 BAR GRAPH The N2 Bar Graph represents your relative No Decompression or Decompression status. The first four seg ments represent No Decompression status and the fifth indicates a Decompression condition. As your Depth and lae ie ie increae egent are ae. A ou acen egent recee, inicating tat aitional o eco (ecoreion) tie i aailale. e i0 onitor tele ierent nitrogen coartent iultane oul an te 2 ar ra ila te one tat i in control o our ie at an gien tie.

ALGORITHM e i0 utilie te to calculate nitrogen tiue loaing. erorance i ae on lann L1 algo rit oel. o create een greater argin o aet it reect to ecoreion, a oneratie actor a ell a o ecoreion ee an aet to can e inclue or o ecoreion ie.

CF (CONSERVATIVE FACTOR) en te i et to n, te ie tie reaining, o eco2 I, ic are ae on te algorit an ue or 22 calculation an ila relating to lan oe, ill e reuce to te alue aailale at te altitue leel tat i 1 (,000 t) iger tan te actual altitue at actiation. eer to te cart in te ac o ti anual or ie tie.

DS (DEEP STOP) en te election i et to , it ill trigger ater ecening eeer tan 2 (80 t). e i0 ten cal culate (continuall uating) a to et equal to ½ te a et.

NOTE: The DS feature only works in DIVE Mode while within No Decompression times.

ile (10 t) eeer tan te calculate , ou ill e ale to acce a reie creen tat ill i la te current calculate ee to etie.

on initial acent to itin (10 t) elo te calculate to et, a creen ilaing a to et at ½ te a et ill aear it a counton tier eginning at 2 in an counting on to 0. I ou ecen (10 t) elo, or acen (10 t) aoe, te calculate to et or 10 econ uring te counton, te o ecoreion ain ill relace te ain ila an te eature ill e iale or te reainer o tat ie. ere i no enalt i te i ignore.

In te eent tat ou enter ecoreion, ecee (10 t), or a ig 2 A (gen aturation) coni tion, ≥ 80%, occurs, the DS will be disabled for the remainder of that dive.

e i iale uring a ig 2 Alarm condition, ≥ set point.

SS (SAFETY STOP) on acent to itin 1. ( t) eeer tan te et et or 1 econ on a o ecoreion ie in ic et eceee (0 t) or 1 econ, a ee ill oun an a at te et et ill aear on te ie ain ila it a counton eginning at te tie et an counting on to 0 in.

I te a et or , te ila ill not aear.

In te eent tat ou ecen (10 t) eeer tan te to et or 10 econ uring te counton, or te counton reace 0, te o ecoreion ain creen ill relace te ain creen ic ill rea ear uon acent to itin 1. ( t) eeer tan te aet to et et or 1 econ.

In te eent tat ou enter ecoreion uring te ie, colete te ecoreion oligation, ten e cen elo (0 t) te ain ill aear again uon acent to itin 1. ( t) eeer tan te et et or 1 econ.

I te ier acen to itin 0.1 ( t) ro te urace or 10 econ, te i to e cancele.

ere i no enalt i ou urace rior to coleting te or cooe to ignore it.

LOW BATTERY WHILE ON THE SURFACE

Warning Level e i0 unction continue ut te acligt i iale. e atter icon aear oli.

Alarm Level All oeration ceae. • The Battery icon flashes for 5 seconds then the unit shuts off.

! WARNING: Change the battery before diving if your i550C indicates the Battery Low Warning or Alarm.

lo atter, oli arning flashing = alarm

LOW BATTERY DURING A DIVE Warning Level e i0 unction continue ut te acligt an luetoot i iale. e atter icon aear oli uon entr into urace oe.

Alarm Level e i0 unction continue ut te acligt an luetoot i iale. • The Battery icon appears flashing. 5 seconds after entering Surface Mode the i550C will shut down.

AUDIBLE ALARM ile oerating in ie or auge oe, te auile alar ill eit 1 ee er econ or 10 econ en alar trie, unle it i et . uring tat tie, te auile alar can e acnolege an ilence pressing the SEL button. An LED Warning Light, on the front of the housing, is synchronized with and flashes as te auile alar oun. It ill turn o en te alar i ilence. e auile an L alar ill not e actie i te auile alar i et to (et AL enu etting).

ituation tat ill actiate te ieauge 10 econ Alar inclue ** Items activate only in Dive mode. ecent eeer tan te et Alar et oint electe. ie ie eaining at te et oint electe. lae ie ie at te et oint electe.

2 at te et oint electe.

ig 2 of 300 OTU (100%)**. 2 ar ra at te et oint electe. Acent rate ecee (0 ) or 8 econ or ore. ntr into ecoreion oe (eco). onitional iolation (aoe a require ecoreion to et or le tan inute). elae iolation (aoe a require ecoreion to et or ore tan inute). elae iolation (a ecoreion to et greater tan 18 0 i require). elae iolation (a erating et o 100 0 t i eceee in ie or 120 t in auge oe).

A ingle ort ee (ic cannot e iale) oun en Ater 10 inute on te urace ater te iolation ie.

uring te olloing ie oe ituation, te 10 econ continuou tone ill e olloe a econ tea ee tat ill not turn o en acnolege Acent aoe a ecoreion to or ore tan inute. ecoreion require a to et eeer tan 18 (0 t) or eeer. n te urace uring a onitional iolation.

DIVE SURFACE MODE

ON THE SURFACE BEFORE A DIVE

e ie ain creen ill ila te (urace) tie, te electe 2 o te reating ga, an te current reure. e tie ilae i te tie ince actiation or te urace interal ater a ie.

rin

ga reure 32% O2 luetoot (i on) ga DIVE SURF MAIN MENU o ie i0 log, cange etting, or itc oe ou ut naigate troug te ur ain enu. nter te enu reing te A utton. en ou reac te en o te enu te i0 ill return to te ie urace ain creen. ou a ol te A utton to croll quicl troug te election. oe creen il ila ata, erea te oter creen are leain to u enu an etting. re te L utton to cooe enu or otion ro te ain enu en aailale. All ain enu creen an otion ill e icue in te orer te aear in te enu elo.

MAIN MENU ADV AL 1 AL 2 AL (nitro onl) LA LA ADV L A AL SEL IL I SEL AL I I to elect an otion

actiate acligt ALT 1 (LAST) e AL 1 creen ila eential ata ro te lat ie. I tere a een no ie itin te current actiation ccle, te ie nuer ill ila ero an ae or te a et an elae ie tie ill e ilae.

2 PREVIOUS DIVES NO PREVIOUS DIVES aiu et

elae ie tie

ALT 2 e AL 2 creen ila current eleation reaing, tie o a, an teerature.

eleation (L2 L, lan i ea leel)

tie

te.

ALT 3 e AL creen ila onl ater a nitro ie. It ila te current ogen aturation leel, rograe

2 Alar etoint, ga nuer, an te current ga i.

% O2 aturation

2 Alar etoint 32% O2 a

FLY/SAT (DESAT) e LA creen ila te ie to l an te A (eaturation) counton. e ie to l counton all egin counting ro 20 to 000 (rin), 10 inute ater uracing ro a ie. e A (eat) counter all roie calculate tie or iue eatuation at ea leel taing into conieration te (oneratie actor) i it a et on. It all egin counting on 10 inute ater uracing ro I oe ie. It ill count on ro a aiu o 2 to 10 (r onl), ten to 000 (rin). en te A counton reace 000 (rin), ic ill generall occur rior to te L counton reacing 000 (rin), te A tie i to reain on te creen a 000 until te L counter ut te i0 o, 2 our ater te lat ie.

NO PREVIOUS DIVES 10 MIN AFTER A DIVE

rin

ila i tie

PLAN reing te L utton ile ieing te LA Leain creen accee te ie lanner oe. i oe calculate ie et an tie liit. o o o, it account or an reiual nitrogen, ogen, urace interal, te rograe ga i, an 2 alar etting. iter (ecoreion) I or 2 I liit are ilae, eening on eter nitrogen or ogen leel ill e te liiting actor. e tie liit ill ila a 1 inute, all tie greater tan ila a .

NOTE: Depths exceeding the MOD (Maximum Operating Depth), if nitrox, or that have less than 1 minute allowed dive time will not be displayed. or 2 I % O2, lan i current turne 2 etoint

ADV ADV

to increae SEL SEL net ite in current 2 Alar et ain enu etoint, lan i 2 i Air eit to acce ain enu lanner LOG reing te L utton ile ieing te L Leain creen accee te ie log. e log tore Inoration ro te latet 2 I anor A oe ie or ieing. I no ie are recore, te eage 0 I ill e ilae in te log. Ater eceeing 2 ie, te ot recent ie i tore ile te olet i elete. ie are nuere ro 1 to 2 tarting eac tie a ie i actiate in eiter ie (or auge) oe. Ater the post dive 24 hour period has elapsed and the unit shuts off, the first dive of the next activation period will be recore a ie 1. I n te eent tat ie tie (in) ecee in, te ata at te interal i recore in te Log uon ur acing o te unit.

NOTE: New data will automatically overwrite the oldest data in memory when the memory becomes full. The i550C Log and Diverlog + Download data is stored separately in different partitions of the memory. The Log only stores a short summary of each dive. Alternately, the Diverlog + Download function stores much larger files for each dive. For this reason, it is normal to see dives stored in the i550C's onboard Log that have already been overwritten in the Diverlog + Download Partition. If you do not remember to log or download your dives, they will be lost when the memory overwrites. See the Diverlog + Download section of this manual for instructions on downloading dives. LOG LEAD-IN LOG PREVIEW lan or (i oneratie tie ie actor a actie) or I, tarte A or A ie, IL or a iolation ie

ADV ADV

net ite in SEL net ie SEL ate ain enu recore o ie

acce ie ie log recor

LOG DATA 1 LOG DATA 2 a et recore eleation o ie location, a tiue loaing, A (or L 2 L) a acent lan i A ie rate ADV re ie urace Interal ADV hr:min, - : - - if first dive during te actiation erio loet teerature ie ie, ee to triggere, SEL a in SEL lan oterie reure ue uring ie (tan 1 onl) to ata 2 to ata or ain enu

LOG DATA 3

% O2 aturation at en o ie, i te ie entere iolation auge oe ADV ga i iget 2 (% O ) reace uring 2 2 te ie SEL

ac to NOTE: Log Data 3 only displays for nitrox ain enu dives; it is bypassed if the dive was an air dive. *The i550C is not compatible with Aqua Lung Transmitters. It can only monitor and record the onboard, tank 1, gas pressure.

SET GAS reing te L utton ieing te et a Leain creen accee te et AirA (nrice Air itro) creen. itin ti creen ou can elect eter to ue Air or itro ga ie. I Air i electe, te i0 ill return ou to te et a Leain creen in te enu. I A i electe, te i0 ill allo ou to cooe a ga 2 (%O2) between 21-100%, PO2 Alar etting, an eter to ue 1, 2, or gae. Aitionall, te i0 allo or eac ga to ae iniiual 2 alar etting. itin te et a 2 Alar 1, 2, an creen te te current 2 Alar etting an correoning (aiu erating et) are ilae.

NOTE: When FO2 is set for AIR, oxygen related data (such as PO2, %O2, and O2 Saturation) will not be displayed at any time during the dive, on the surface, or in Plan Mode. Though these oxygen values will be tracked internally for use in any subsequent nitrox dives.

NOTE: Gas 1 cannot be set to OFF.

NOTE: The i550C can only monitor and record the onboard, tank 1, gas pressure. When Gas 2 or 3 are the active gas the gas pressure will not be displayed on the Main screen.

SET GAS LEAD-IN SET AIR/EAN

ADV ADV

Air or A

if Air: back to Set Gas Lead-in SEL SEL net ite in toggle if EAN: to Set Gas 1 FO2 ain enu etting

acce ae

et 2 etting

SET GAS 1 FO2 SET GAS 1 PO2 ALARM

a a

ADV ADV

flashing, 2 (2%)

2 (2%) etting etting SEL SEL aut 2 current aut 2 flashing, etting etting 2 Alar 2 Alar etting etting

ae ae etting etting

SET GAS 2 FO2 SET GAS 2 PO2 ALARM (gas 3 is similar) (gas 3 is similar)

a a

ADV ADV

flashing, 2 (2%)

2 (2%) etting etting SEL SEL aut 2 current aut 2 flashing, etting etting 2 Alar 2 Alar etting etting

ae ae etting etting

SET AL (ALARMS) reing te L utton ile ieing te et AL Leain creen accee te et AL u enu. itin ti menu you can customize the following five alarm settings.

SET AL LEAD-IN

ADV

net ite in SEL ain enu

acce et AL enu

1. AUd AL (Audible Alarms) e Auile Alar eature allo ou to et auile alar or .

SET AUD AL or

ADV

toggle SEL etting

ae etting

2. dEPTH AL (Audible Alarms) e et Alar eature allo ou to et a aiu et alar. SET DEPTH AL

or 10 100 (0 0 t) ADV

to cange SEL etting

ae etting

3. Edt AL (Elapsed Dive Time Alarm) i eature allo ou to et an alar to go o at a reeterine aount o ie tie. SET EDT AL ilae or lan i EDT AL TRIGGERED

ADV

etoint 10 180 in or lan i flashing to cange SEL etting

ae etting

4. N2 AL (Nitrogen Alarm) i eature allo ou to et an alar to go o at a reeterine nuer o 2 ar gra eg ent. N2 AL N2 AL TRIGGERED or lan i

ADV o egent electe i flashing

to cange SEL etting

ae etting

5. dtr AL (Dive Time Remaining Alarm) i eature allo ou to et an alar to go o it a eignate reere o ie tie reaining. DTR AL DTR AL TRIGGERED flashing or lan i itce on

etoint 20 in ADV lan i

to cange SEL etting

ae etting

6. TURN AL (Turn Pressure Alarm) i eature allo ou to et an alar to go o at a eignate turn reure. ou a cooe or 0 to 20 A (1000 to 000 I) in increent o A (20 I). TURN AL TURN AL TRIGGERED

ADV

flashing

to cange SEL flashing etting

ae etting 7. PRESS AL (Pressure Alarm) i eature allo ou to et an alar or en ou reac a eignate en reure. ou a cooe ro ro 20 to 10 A (00 to 100 I) in increent o A (100 I).

NOTE: The Pressure Alarm only considers the gas 1 when diving with multiple gases. PRESS AL PRESS AL TRIGGERED

ADV

flashing

to cange SEL flashing etting

ae etting

SET UTIL (UTILITIES) reing te L utton ile ieing te et IL Leain creen accee te et IL u enu. itin ti enu ou can cutoie te olloing nine oerational unction.

SET UTIL LEAD-IN

ADV

net ite in SEL ain enu

acce et IL enu

1. H2O TYPE (Water Type) e 2 e eature allo ou to et AL or ater enironent or accurate et calculation. SET H2O TYPE

ADV

toggle SEL etting

ae etting

2. H2O ACT (Water Activation) e 2 A eature allo ou to turn ater contact actiation.

! WARNING: With H2O ACT turned OFF, you MUST remember to manually activate the i550C before any dive. SET H2O ACT

ADV

to toggle SEL etting

ae etting

3. UNITS (IMP/MET) e nit eature allo ou to elect eter (etric) or I (ierial) unit o eaure ill e ilae. SET UNITS

or I, , I °

ADV

toggle SEL etting

ae etting

4. dEEP STOP e ee to eature can e et or . SET DEEP STOP

ADV

toggle SEL etting

ae etting 5. SS (SAFETY STOP) e aet to eature can e et or . I i electe, ou a cooe ro an aail ale or in aet to at et o , , , or (10, 1, or 20 t). SET SAFETY STOP SET STOP TIME SET STOP DEPTH

ON or OFF 3 or 5 min

ADV ADV ADV

toggle SEL toggle SEL advance SEL (3, 4, 5; 6 m) setting setting setting or (10, 15; 20 ft)

save save save setting setting setting

6. CF (Conservative Factor) e eature can e et or . SET CF

ADV

toggle SEL etting

ae etting

7. bLUETOOtH (Bluetooth Communication) itin ti creen te luetoot a e turne or . en i electe, ae ill ila equentiall at te to o te creen inicating tat luetoot i initiating. en lue tooth® is turned on it will operate in sniffing mode (searching for compatible devices) while on the urace an te i0 creen i actie. ounication it our i0 ut e initiate it our oile eice uing ierlog otare.

NOTE: When Bluetooth® is ON the Bluetooth® icon will be displayed when on the surface with the screen activated. Bluetooth® is temporarily deactivated when the i550C enters Sleep Mode (screen is turned off) or a dive is started. The i550C returns to "sniffing" mode when the i550C returns to Surface Mode after a dive or a button is pushed to wake the computer from Sleep Mode on the surface. You will notice the Bluetooth® icon flashing as the Bluetooth® function is reinitiating. SET BLUETOOTH

ADV

aance SEL etting

ae etting 8. LIGHt (BACKLIGHT) DURATION i etting i te uration te acligt ta on ater releaing te utton. e otion are , ec, or 10 ec. SET LIGHT

ADV , ec 10 ec

aance SEL etting

ae etting

9. SR (SAMPLE RATE) e ale ate control o requentl te i0 tore a ata naot uring a ie or onloa uring a ie. etting otion are 2, 1, 0, or 0 econ interal. orter interal ill roie a ore recie recor o our ie.

NOTE: New data will automatically overwrite the oldest data in memory when the memory becomes full. The i550C Log and Download data is stored separately in different partitions of the memory. The Log only stores a short summary of each dive. Alternately, the Down- load function stores much larger files for each dive. Depending on the chosen settings and dive durations, it is possible to see dives stored in the i550C's onboard Log that have already been overwritten in the Download Partition. Choosing a longer Sample Rate interval will consume less memory per dive. Remember to download your dives more frequently if you are using a shorter Sample Rate interval.

SET SR DIVE & GAUGE MODE DOWNLOAD MEMORY CAPACITY ADV 2, 1, 0, or 0 ec SAMPLE MAXIMUM RATE HOURS (seconds)

aance SEL 2 8 etting 15 64 30 128 ae 60 256 etting

SET TIME reing te L utton ile ieing te et I Leain creen accee te et I u enu. itin ti enu ou can et te tie orat, ate, an tie o a.

SET TIME LEAD-IN SET DATE FORMAT SET HOUR FORMAT ( ) or ( ) ont 12 or 2 a

ADV ADV ADV

net ite in SEL toggle SEL toggle SEL ain enu etting etting

acce ae ae et I etting etting enu

SET TIME SET DATE ooe an ae te ear. en reeat or te ont an a.

ADV ADV

ooe an ae te our. en or eening reeat or inute. on electe orat

aance SEL aance SEL etoint etoint

ae ae etting etting SET MODE et oe allo ou to cooe eteen i (tanar recreational ie) or A oe o oeration.

NOTE: The i550C will be locked in Gauge mode for 24 hours after surfacing from any Gauge or Viola- tion Dive. Otherwise, you may switch modes freely while in either Surface Mode.

SET MODE LEAD-IN SET MODE

ooe eteen ADV ADV i or A.

SEL SEL net ite in aance ain enu etoint

acce ae et oe etting HISTORY itor i a uar o aic ata recore uring all i an A ie.

TOTAL DIVES TOTAL HOURS eeet EXTREMES recore ie 0 loet recore ater ADV ADV ADV teerature

longet iget altitue recore SEL recore or a ie net ite in SEL SEL ie ain enu

acce to tree ac to otal ila ain enu our

SN (SERIAL NUMBER) Inoration ilae on te erial uer creen oul e recore an et it our ale receit it ill e require in te eent tat our i0 require actor erice. SERIAL NUMBER

reiion

ADV

erial

return to SEL ie ur ain

DIVE OPERATION

INITIATING A DIVE it te i0 actiate, a ie ill coence uon ecening to 1. ( t) or at leat econ. elo i a iagra to el ou naigate ie oe unction.

NO DECOMPRESSION DIVE MAIN

ADV

AL 1 ADV AL 2 (onl i ) ee to reie ac to ain SEL

actiate acligt or acnolege alar

*Only available if Deep Stop is triggered and active

NO DECOMPRESSION DIVE MAIN ro te ain creen ou can ee all critical ie araeter. uring a ie an auile alar a oun an te riorit o inoration ilae a cange. i i to inicate a aet recoenation, arning, or alar. e olloing inoration in ti cater eontrate an ecrie an uneentul ie, in ter o aet. Alar are ecrie in te olication ection o ti cater.

! WARNING: Before diving with the i550C take time to familiarize yourself with both normal and alarm conditions of operation.

ie ie eaining 0 in, all tie greater tan ila a et ( or 2 I eening on ic i te liit a ie eaining 0 in, all ing actor) tie greater tan ila a

A ar gra 2 ar gra

elae ie tie ee to 0 in i triggere a ga reure ga reure i not ilae en ga 2 or i te electe ga.

DIVE ALT 1 i creen tell ou te aiu et, current tie o a, an aient teerature.

DIVE ALT 2 e AL 2 creen ila inoration ertaining to nitro it i ae i te i0 i et or air.

% O2 aturation 0 100 current

2 alue

2 etting ga

DEEP STOP PREVIEW I ee to a et to in te IL enu, te ee to reie creen i aailale ater eceeing 2 (80 t) o et. e ee to i ala at a et al tat o our aiu et uring te ie. i reie creen ee trac o tat et or ou.

ee to et

to tie

DEEP STOP MAIN I triggere, te ee to ill actiate uon acening to itin (10 t) elo te calculate ee to et. e to tie ill e ilae an count on to 0 in 00 ec a long a ou ta itin (10 t) aoe or elo te to. ile ee to ain i ilae, ou a acce u to AL ila reing te A utton to ccle troug te. e are iilar to te o ecoreion ain, ie AL 1, an ie AL 2 ila, reectiel. ee ee to in te ie eature cater or urter etail.

NOTE: The i550C does not penalize for a missed Deep Stop.

to et

reaining to tie

SAFETY STOP MAIN I triggere, te aet to ill actiate uon acent to itin 1. ( t) eeer tan te aet to et on a o ecoreion ie. e to tie ill ten counton to 0 in 00 ec. ile aet to ain i ilae, ou a acce u to AL ila reing te A utton reeatel. e are iilar to te o eco reion ain, ie AL 1, an ie AL 2 ila, reectiel. ee aet to in te ie eature cater or urter etail.

NOTE: The i550C does not penalize for a missed Safety Stop.

to et

reaining to tie

SURFACING Upon ascending to 0.9 m (3 ft) the i550C transitions to Dive Surface mode. For the first 10 minutes after a dive te i0 ill continue to ila te aiu et an elae ie tie. nce te urace tie reace 10 inute te i0 ill ila te tanar ie urace creen.

NOTE: The i550C requires a 10 minute surface interval to record a subsequent dive as a separate dive in the Log. Otherwise, the dives will be combined and recorded as a single dive in the i550C memory. < 10 MIN ON SURFACE ≥ 10 MIN ON SURFACE

a et

urace tie rin

2 (% O2) ga reure

GAS SWITCHES

! WARNINGS: • Historically, many accidents and near misses have occurred by switching to the wrong gas at the wrong depth. DO NOT attempt gas switch decompression dives without proper education and training to do so from an internationally recognized training agency. • Diving deeper than 39 m (130 ft), will greatly increase your risk of decompression sickness. • Decompression diving is inherently hazardous and greatly increases your risk of decompression sickness, even when performed according to the dive computer's calculations. • Using an i550C is no guarantee of avoiding decompression sickness. • The i550C enters Violation Mode when a situation exceeds its capacity to predict an ascent procedure. These dives represent gross excursions into decompression that are beyond the boundaries and spirit of the i550C's design. If you are following these dive profiles, Aqua Lung advises that you should not use an i550C. • If you exceed certain limits, the i550C will not be able to help you get safely back to the surface. These situations exceed tested limits and can result in loss of some functions for 24 hours after the dive in which a violation occurred. OVERVIEW All ie egin it A 1. e A eault to 1 ater 10 inute on te urace. a itce can onl e ae en a ie ain creen i ilae an gae 2 are et on. ae cannot e itce ile on te urace. e a itc enu cannot e accee uring te ouning o alar. I an alar trie ile in te a itc enu, te itc oeration i terinate (reerting to te ie ain creen. DIVE MAIN CONFIRM SWITCH

current

2 alue

ADV ADV

2 etting

SEL SEL to a itc to net ga creen or ie ain creen

to confirm itc

I te current 2 alue i greater tan 1., ten a arning not to itc ill ila. e i0 ill aintain te current ga itout itcing. e ier a oerie te i0 an orce te ga itc reing te L utton uring te I eage.

! WARNING: Switching to gases with a PO2 above 1.6 has a high risk of oxygen poisoning, convulsions, and drowning. Doing so should always be avoided. It is intended as a last resort option because of the likelihood of injury or drowning. Always dive within your training, experience, and skill level.

DIVE MAIN

current alue 2 etting o electe 2 ga

COMPLICATIONS

e receing inoration a ecrie tre ree caual ie oeration. our ne i0 i alo eigne to el ou to te urace in le tan ieal ituation. e olloing i a ecrition o tee. ae oe tie to ailiarie ourel it tee oeration eore iing our i0.

DECOMPRESSION ecoreion oe actiate en teoretical o ecoreion tie an et liit are eceee. on entry into Decompression, the audible alarm will sound and the alarm LED will flash. The full N2 bar Graph and Up Arrow icon will flash until the audible alarm is silenced.

nce itin (10 t) elo te require to et (to one), te ull to icon (ot Arro it to ar) ill e ilae oli.

To fulfill your decompression obligation, you should make a safe controlled ascent to a depth slightly deeper than, or equal to, te require to et inicate an ecore or te to tie inicate. e aount o eco reion creit tie tat ou receie i eenent on et, it ligtl le creit gien te eeer ou are e lo te to et inicate. ou oul ta ligtl eeer tan te require to et inicate until te net alloer to et aear. en, ou can lol acen to, ut not alloer tan tat inicate to et.

DECOMPRESSION ENTRY Upon entry into decompression the audible alarm will sound and the alarm LED will flash until the audible alarm is silenced. The message UP, Up Arrow, and full N2 Bar Graph icons will flash. Additionally, the stop depth, stop tie, an te (ie o urace) alue ill e ilae. inclue to tie at all require ecore ion to lu ertical acent tie ae on te a rate alloe.

to et

0 , ten i greater tan in

to tie DECOMPRESSION STOP MAIN ecoreion to ain ill ila uon acening to itin (10 t) elo te ecoreion to et. e icon, te ull to icon (ot Arro it to ar) ill e ilae oli. ile ecoreion to ain i ilae, ou a acce u to AL ila reing te A utton to ccle troug te. e are iilar to te o ecoreion ain, ie AL 1, an ie AL 2 ila, reectiel.

to et

0 , ten i greater tan in

to tie

CV (CONDITIONAL VIOLATION) on acent aoe te require ecoreion to et, oeration ill enter uring ic no o gaing creit ill e gien.

The audible alarm will sound and the alarm LED will flash. Additionally, the full N2 Bar Graph and Down Arrow icon will flash. Meanwhile, the DOWN message will alternate with gas pressure until the audible alarm is silenced. en te 2 ar ra ill e oli.

> The Down Arrow icon continues to flash until descending below the required Stop Depth (within stop zone), then te ull to icon (to ar it ot Arro) ill e on oli. I ou ecen eeer tan te require ecoreion to eore inute elae, ecoreion oera tion ill continue it no o gaing creit gien or tie aoe te to. Intea, or eac inute aoe te to 1 inute o enalt tie ill e ae to require to ie. e ae enalt (ecoreion) tie ill ae to e ore o eore otaining o gaing creit. nce te enalt tie i ore o, an o gaing creit egin, require ecoreion to et an ie ill ecreae toar ero. e 2 ar ra ill recee into te o ecoreion one, an oeration ill reert to o ecoreion oe.

on arro flashing 2 ar ra flashing

alternating it ga reure

DV 1 (DELAYED VIOLATION 1) I ou reain alloer tan a ecoreion to et or ore tan inute, oeration ill enter 1 ic i a continuation o it enalt tie till eing ae. Again, te auile alar ill oun an te ull N2 Bar Graph will flash until it is silenced. ALT screens are accessed and appear similar to Decompression ALT creen.

*The difference is that 5 minutes after surfacing from the dive, operation will now enter Violation Gauge Mode.

> Down Arrow icon flashes and DOWN message continues to alternate with gas pressure until descent below the require to et, ten te ull to icon ill e on oli. I te 1 tatu i ignore, te i0 ill enter 1 urace oe or inute uon uracing ro te ie. VIOL (Violation) and Down Arrow icon will be flashing. After 5 minutes on the surface in DV1 mode, the unit will enter (iolation auge oe).

DV1 DIVE MAIN DV1 < 5 MIN ON SURFACE

IL (iolation), flashing

ie to to etie et alternate it urace ie alternating tie require it ga at ie to reure

DV 2 (DELAYED VIOLATION 2) I te calculate ecoreion oligation require a to et eteen 18 (0 t) an 21 (0 t), oeration ill enter 2. The audible alarm will sound and the alarm LED will flash. The full N2 Bar Graph will flash until the audible alarm i ilence.

> Up Arrow icon flashes if 3 m (10 ft) deeper than the required Stop Depth. nce itin (10 t) o an elo te require to et, te to icon (ot Arro it to ar) ill e ilae oli.

DV 3 (DELAYED VIOLATION 3) I ou ecen eeer tan te aiu unctional et, te auile alar ill oun an te alar L will flash. Also, the Up Arrow icon, UP message will flash, and Current Depth/Max Depth/DTR will only indicate ae igniing tat ou are too ee.

* The maximum functional depth {Dive Mode 100 M (330 FT), Gauge Mode 120 M (399 FT)} is the depth at which the i550C can properly per- form calculations or provide accurate display information.

on acening aoe te aiu unctional et, current et ill e retore. e Log or tat ie ill alo ila ae or a et.

DV3 DIVE MAIN LOG, DV3 DIVE

flashing

VGM (VIOLATION GAUGE MODE) DURING A DIVE uring ie oe ie, oeration ill enter en ecoreion require a to et greater tan 21 (0 t). eration oul ten continue in uring te reainer o tat ie an or 2 our ater uracing. turn te i0 into a igital intruent itout an ecoreion or ogen relate calculation or i plays. Upon activation of VGM, the audible alarm will sound and the alarm LED will flash. The graphic VIOL (viola tion) will temporarily replace the gas pressure and the Up Arrow icon will flash. After the audible alarm becomes ilent, te an 2 ar ra ill e reoe ro te ila an ga reure ill e retore. VGM DURING AUDIBLE ALARM VGM AFTER AUDIBLE ALARM

flashing

flashing flashing

VGM (VIOLATION GAUGE MODE) ON THE SURFACE on uracing, te ie ain ill reain on ila or 10 inute it urace Interal tie ilae with the SURF icon flashing. The graphic VIOL will also still be displayed flashing. Operation will also enter VGM inute ater uracing ro a ie in ic a elae iolation occurre.

A ull 2 our continuou urace interal ut ten e ere eore all unction are retore. uring tat 2 our, oe not allo acce to te A, LA, an LA (eat) eature creen. e L counton inicate tie reaining eore noral oeration can reue it ull eature an unc tion. VGM SURFACE < 10 MIN VGM SURFACE > 10 MIN

flashing

HIGH PO2 Alar at et oint alue, ecet in ecoreion ten at 1.0 onl

Alarm

I 2 continue to increae an reace te alar et oint, te auile alar oun again. e

PO2 value, UP message, and Up Arrow icon will flash until PO2 ecreae elo te alar et oint.

Ater te auile alar i ilence, te 2 ill alternate it ga reure. DURING AUDIBLE ALARM AFTER AUDIBLE ALARM

alternate it eage flashing an arro

alternate

it 2

PO2 During Decompression e 2 alar etting oe not al en in ecoreion. I 2 reace 1.0 ile at a eco

reion to, te 2 alue (1.0) it icon ill alternate it ga reure.

*PO2 on for 10 seconds, gas pressure on for 50 seconds until PO2 decreases below 1.60, then PO2 will not be displayed.

alternate it ga reure

HIGH O2 SAT (OXYGEN SATURATION) Warning >> at 80 to 99% (240 OTU) Alarm >> at 100% (300 OTU) Warning

en 2 reace te arning Leel, te auile alar oun an te 2 A (aturation) alue ill flash in place of the DTR. The DTR will be restored when the audible alarm is silenced.

% O2 SAT flashing

Alarm I 2 A reace te Alar leel, te auile alar oun an te eage an te 2 A value will flash in place of DTR until surfacing.

flashing

Warning During Decompression en 2 A reace te arning Leel, te auile alar oun an te 2 A alue ill te porarily flash in place of the Stop Depth and Stop Time. The STOP icon continues to disply. When the auile alar i ilence, te tanar ecoreion ie creen i retore.

% O2 SAT flashing

Alarm During Decompression I 2 A reace te Alar leel, te auile alar oun an te 2 A alue ill teoraril flash in place of the Stop Depth and Stop Time. Time When the audible alarm is silenced, the O2 SAT alue ill alternate it te to et ie.

% O2 SAT flashing

Alarm On Surface on uracing, te ie ain creen i ilae or 10 inute it acce to te ie AL al loe. • If O2 SAT is 100%, the value will alternate with SURF time on the Main Screen until it is < 100%, ten it ill e relace it tie. • If you surface due to 100% O2 SAT without completing the Decompression obligation, the full N2 Bar Graph and O2 SAT value (100) will flash with O2 SAT icons for the first 10 minutes, then opera tion ill enter (iolation auge oe). • Access to Dive ALT screens is allowed during the first 10 minutes, then access to the Dive Surface enu i alloe. SURFACE < 10 MIN, SURFACE > 10 MIN, 100% O2 SAT VGM TRIGGERED

iolation

alternating it alternating it tie % O2 SAT

GAUGE MODE

ON THE SURFACE BEFORE A DIVE There are two Gauge Surface Main screens. The first screen displays when there have been no dives yet or the surface interval after a dive has been greater than 10 min. The second screen displays only during the first ten inute ater a ie. GAUGE SURF MAIN GAUGE SURF MAIN (no dive yet or > 10 min SI) (< 10 min post dive) oe i A (auge) a et o reiou ie

urace interal rin

ie , ie tie o reiou ie, 0 or none et 0 in, i

GAUGE SURF MAIN MENU o ie i0 log, cange etting, or itc oe ou ut naigate troug te ur ain enu. nter te enu reing te A utton. en ou reac te en o te enu te i0 ill return to te auge urace ain creen. ou a ol te A utton to croll quicl troug te election. oe creen il ila ata. ile oter creen are leain to u enu an etting. re te L utton to cooe enu or otion ro te ain enu en aailale. MAIN MENU ADV AL 1 AL 2 L L AL ADV IL I SEL AL I SEL

to elect an otion

actiate acligt

NOTE: The Gauge Surface Main, ALT screens, and Menu options are similar to those described previ- ously for Dive Mode. See the Dive Surface Mode chapter for further details.

INITIATING A DIVE it te i0 actiate, a auge ie ill coence uon ecening to 1. ( t) or at leat econ. elo i a iagra to el ou naigate auge ie oe unction.

ADV

AL 1 ADV ac to ain

SEL

actiate acligt or acnolege alar GAUGE DIVE MAIN e auge ie ain roie aic inoration incluing et, ie tie, an acent rate uring te ie.

et a ie eaining 0 in, all tie greater tan ila a

A ar gra

ga reure elae ie tie 0 in

GAUGE DIVE ALT 1 i creen il tell ou te a et o te ie, current tie o a, an aient teerature.

DV 3 (DELAYED VIOLATION 3) I ou ecen eeer tan te aiu unctional et, te auile alar ill oun an te alar L ill flash. Also, the Up Arrow icon, UP message will flash., and Current Depth will only indicate dashes signifying that ou are oo ee.

*The maximum functional depth {Dive Mode 100 M (330 FT), Gauge Mode 120 M (399 FT)} is the depth at which the i550C can properly per- form calculations or provide accurate display information. Refer to the Specifications in the back.

on acening aoe te aiu unctional et, current et ill e retore. e Log or tat ie ill ila ae or a et.

DV3 GAUGE LOG, DV3 GAUGE

flashing

NOTE: The Gauge Mode operation is similar to Dive Mode. Only features unique to Gauge Mode have been described in this section. See the previous Dive Operation section for further details on all the alarms and functions of the i550C.

REFERENCE

UPLOADING/DOWNLOADING DATA A reioul ecrie (age 28), te i0 can e aire uing te luetoot eature. i require a oile eice it luetoot running ierlog otare.

e etting loa ortion o te rogra can e ue to etcange te ae, et AL grou (Alar), et IL grou (tilitie), an et I grou (ieate) uing te ae Interace te. e oe etting ut e entere uing te i0 utton control.

Inoration aailale or retrieal (onloa) ro te i0 inclue ite uc a ie nuer, urace interal tie, et, ie tie, tart atetie, loet teerature, aling rate, et oint, 2 ar ra, an A ar ra.

eer to te ierlog otare alication or urter intruction on lining our i0 to our oile eice.

ater contact

et enor CARE AND CLEANING rotect our i0 ro oc, eceie teerature, eoure to ceical, an taering. rotect te len againt cratce it an Intruent Len rotector. all cratce ill naturall iaear unerater. oa an rine te i0 in re ater at te en o eac a o iing, an cec to enure tat te area aroun te Lo reure (et) enor, ater contact, an utton are ree o eri or otruction. • To dissolve salt crystals, use lukewarm water or a slightly acidic bath (50% white vinegar/50% fresh water). After reoal ro te at, lace te i0 uner gentl running re ater. oel r eore toring. ee our i0 cool, r, an rotecte uring tranort.

SERVICE

! WARNING: At a minimum, annually check the altitude reading on the ALT 2 screen (p. 19) and Pre-Dive Planner (p. 20, 54) for accuracy. If your i550C is ever out of calibration (incorrect elevation reading, incorrect No Decompression Dive Times in the planner, or showing a depth reading at the surface) or displays an error code message (EEP, ALT, CAL, ERR, CSM, A-D), it must be serviced at the factory before use.

I require to return our i0 to Aqua Lung tain an A (eturn Autoriation) nuer contacting tt.aqualung.couuortcontactu or (0) 000 ecor all ie ata in te Log anor onloa te ata tore in eor. All ata ill e erae uring actor erice. acage it uing a rotectie cuioning aterial. • Include a legible note stating the specific reason for return, your name, address, daytime phone number, serial nuer(), an a co o our original ale receit an arrant egitration. en reigt reai an inure uing a traceale eto. onarrant erice ut e reai. i not accete. Aitional inoration i aailale on te Aqua Lung e ite .AquaLung.co or on te local Aqua Lung e ite tat ere our gloal region.

! CAUTION: The procedures that follow must be closely adhered to. Damage due to improper battery replacement is not covered by the i550C's warranty.

BATTERY REPLACEMENT

NOTE: When the battery is removed, settings and calculations for repetitive dives are retained in the unit's memory while a new battery is installed.

e atter coartent oul onl e oene in a r an clean enironent it etree care taen to reent te entrance o oiture or ut. o reent oration o oiture in te atter coartent, it i reco ene tat te atter e cange in an enironent equialent to te local outoor teerature an uiit (e.g., o not cange te atter in an air conitione enironent, ten tae it outie uring a ot unn a).

atter oer eoal urn te oule oer to eoe te atter coer. ncre te coer turning counterclocie (uing a coin L). eoe te atter coer. eoe te coer ring an, a on. ue tool.

atter eoal areull lit te atter out o te ouing, a on. en or aage te atter terinal.

Inection loel cec all o te trea an ealing urace or an ign o aage tat igt iair roer ealing. Inect te utton, len, atter coer, an ouing to enure te are not crace or aage. ec te etal contact or an ign o tre or corroion.

! WARNING: If damage or corrosion is found, return your i550C to an authorized Aqua Lung dealer, and DO NOT attempt to use it until it has received factory prescribed service.

atter Intallation lace a ne olt te 20 litiu atter, ( ) negatie ie on into te atter coartent.

atter oer Intallation Ligtl luricate a ne coer ring it ilicone greae an intall it on te ring grooe o te atter coer. nure tat it i eenl eate.

! Caution: The O-ring must be a genuine Aqua Lung part that can be purchased from an authorized Aqua Lung dealer. Use of any other O-ring will void the warranty.

areull intall te atter coer turning it clocie until ecure (uing a coin L).

Inection Actiate te unit an atc careull a it eror a ull iagnotic an atter cec, an enter urace oe. ere te L ila to enure it i conitentl clear an ar in contrat trougout te creen.

! WARNING: If there are any portions of the display missing or appearing dim, or if a low battery condition is indicated, return the unit to an authorized Aqua Lung dealer for a complete evaluation before attempting to use it.

ALTITUDE SENSING AND ADJUSTMENT Altitue (i.e., aient reure) i eaure uon actiation an eer 1 inute until a ie i ae. eaureent are onl taen en te unit i r. • Two readings are taken, the second reading 5 seconds after the first. The readings must be within 30 cm (1 ft) of eac oter to recor tat aient reure a te current altitue. o autent are ae uring an tie tat te et ontact are rige. en iing in ig altitue ater ro 1 to ,20 (,001 to 1,000 t), te i0 autoaticall aut to

tee conition roiing correcte et, an reuce (ecoreion) an 2 I (2 atura tion) tie at interal o 0 (1,000 t). en te oneratie actor i et , L are calculate ae uon te net iger 1 (,000 t) alti tue. At ea leel, calculation are ae uon an altitue o ,000 eet. All autent or altitue greater tan , (11,000 t) are ten ae to alloale ie tie or ,20 (1,000 t). e i0 ill not unction a a ie couter aoe ,20 (1,000 t).

QUICK DISCONNECT HOSE (OPTIONAL) e otional uic iconnect allo or conenient reoal an torage o our i0 conole.

uic iconnect oe eoal • Push the hose fitting towards the i550C and turn counterclockwise ¼ turn. The hose will release from the con ole.

uic iconnect oe Ael • Visually inspect the fittings and connection O-ring for damage, corrosion, or deterioration.

! WARNING: If damage, corrosion, or deterioration is found, return your i550C to an authorized Aqua Lung dealer, and DO NOT attempt to use it until it has received factory prescribed service.

• Line up the Quick Disconnect Hose fitting with the male fitting on the i550C console. • Then push the two fittings together while turning clockwise ¼ turn.

ring

TECHNICAL DATA

© Aqua Lung International, Inc. (2018) 53 oc. 120r0 (10118) ALGORITHM >> NDLS (HR:MIN) AT ALTITUDE (IMPERIAL) Altitue 0 001 001 001 001 001 8001 001 10001 11001 12001 1001 (eet) to to to to to to to to to to to to 000 000 000 000 000 8000 000 10000 11000 12000 1000 1000 et ( ) 0 1 20 221 21 208 202 1 12 1 1 1 12 0 1 121 11 111 108 10 102 100 0 0 0 01 0 10 0 01 0 0 0 02 0 0 0 0 0 0 08 0 0 0 02 00 028 02 02 02 022 021 0 0 02 02 02 021 020 01 018 01 01TECHNICAL 01 01 DATA 80 02 01 018 01 01 01 01 01 012 011 011 010 0 01 01 01 01 012 011 010 010 00 00 008 008 100 01 011 010 010 00 00 008 008 00 00 00 00 110 012 00 008 008 008 00 00 00 00 00 00 00 120 010 008 00 00 00 00 00 00 00 00 00 00 10 008 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00 00 10 00 00NO 00 DECOMPRESSION 00 00 00 00 TIME 00 LIMITS 00 00 00 00 180 00 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00 000

ALGORITHM >> NDLS (HR:MIN) AT ALTITUDE (METRIC) Altitue 0 1 1221 12 181 21 21 2 01 1 (eter) to to to to to to to to to to to to 1 1220 12 180 21 20 2 00 0 20 et ( ) 21 21 22 21 210 20 1 1 10 1 1 12 1 12 121 11 112 108 10 10 100 08 0 0 1 108 0 0 01 0 0 0 02 0 0 0 0 18 00 0 0 0 0 02 00 028 02 02 02 022 21 0 028 02 02 02 021 020 01 018 01 01 01 2 02 020 01 018 01 01 01 01 01 012 011 011 2 020 01 01 01 012 011 011 010 00 00 00 008 0 01 012 011 010 00 00 00 008 008 00 00 00 01 00 00 008 008 00 00 00 00 00 00 00 010 008 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 2 008 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 8 00 00 00 00 00 00 00 00 00 00 00 00 1 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

ALGORITHM >> NDLS (HR:MIN) AT ALTITUDE (IMPERIAL) Altitue 0 001 001 001 001 001 8001 001 10001 11001 12001 1001 (eet) to to to to to to to to to to to to 000 000 000 000 000 8000 000 10000 11000 12000 1000 1000 et ( ) 0 1 20 221 21 208 202 1 12 1 1 1 12 0 1 121 11 111 108 10 102 100 0 0 0 01 0 10 0 01 0 0 0 02 0 0 0 0 0 0 08 0 0 0 02 00 028 02 02 02 022 021 0 0 02 02 02 021 020 01 018 01 01 01 01 80 02 01 018 01 01 01 01 01 012 011 011 010 0 01 01 01 01 012 011 010 010 00 00 008 008 100 01 011 010 010 00 00 008 008 00 00 00 00 110 012 00 008 008 008 00 00 00 00 00 00 00 120 010 008 00 00 00 00 00 00 00 00 00 00 10 008 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00 00 180 00 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00 000

ALTITUDE LEVELS DISPLAY RANGE: FEET (METERS) A 1 (0 to ,000) L2 1 to 1,2 (,001 to ,000) L 1,2 to 2,1 (,001 to ,000) L 2,1 to 2, (,001 to ,000) L 2, to , (,001 to 11,000) L , to , (11,001 to 1,000) L , (1,000)

OXYGEN EXPOSURE LIMITS (from NOAA Diving Manual) MAX DURATION MAX TOTAL DURATION PO2 SINGLE EXPOSURE 24 HOUR DAY (ATA) (MIN) (MIN) 0.0 20 20 0.0 0 0 0.80 0 0 0.0 0 0 1.00 00 00 1.10 20 20 1.20 210 20 1.0 180 210 1.0 10 180 1.0 120 180 1.0 10

SPECIFICATIONS

CAN BE USED AS ie outer (Air or itro) igital et augeier

DIVE COMPUTER PERFORMANCE lann L1 ae algorit ecoreion in agreeent it lann L1 o ecoreion ee to orroni, ennett ecoreion ee to (not recoene) latteau, ert, uti Altitue ulann, IA, (ro) Altitue correction an 2 liit ae on AA tale

OPERATIONAL PERFORMANCE unction Accurac • Depth ±1% of full scale ier 1 econ er a

Dive Counter: IA ila ie 1 to 2 (0 i no ie ae et) eet to ie 1, uon iing (ater 2 our it no ie)

Dive Log Mode: tore 2 ot recent IA ie in eor or ieing Ater 2 ie, a 2t ie in eor an elete te olet ie

Altitude: erational ro ea leel to ,20 (1,000 t) eleation eaure aient reure eer 0 inute en inactie, uon actiation, eer 1 inute ile actiate. oe not eaure aient reure en et. oenate or Altitue aoe ea leel eginning at 1 (,001 t) eleation an eer 0 (1,000 t) iger.

Power: (1) , 20, Litiu atter (anaonic or equialent) el lie to ear (eenent on atter anuacturer) elaceent er (annual recoene) e Lie 100 ie our i (1) 1 our ie er ie a to 00 our i () 1 our ie er a

Battery Icon: arning icon on oli at 2. olt, atter cange recoene • Alarm - icon on flashing at 2.50 volts, change the Battery

Activation: anual u utton (recoene), require rior to ie i 2 A (actiation) i et . Autoatic ecent in ater (i 2 A i et ) annot e anuall actiate eeer tan 1.2 ( ), i 2 A i et . annot oerate at eleation iger tan ,20 (1,000 t)

Operating Temperature: ut o te ater eteen . an 0 (20 an 10 ). In te ater eteen 2.2 an (28 an ).

N2 Bar Graph segments o ecoreion oral one 1 to o ecoreion aution one ecoreion one (all)

ASC (Ascent) Rate egent oral one 0 0 0 10 oral one 1 . . 11 1 oral one 2 1 20 oral one . . 21 2 aution one 8 2 0 • Too Fast zone (flashing) 5 (all) > 9 > 30

NUMERIC DISPLAYS: Range: Resolution: ie uer 0 to 2 1 et 0 to 120 (00 ) .11 (1 )

2 Set Point Air, 21 to 100 % 1 %

2 alue 0.00 to .00 AA 0.01 AA ie ie eaining 0 to in, ila i in 1 inute ie o urace 0 to in, ila i in 1 inute o ecoreion ee to ie 2 to 0 in 1 inute o ecoreion aet to ie to 0 in 1 inute ecoreion to ie 0 to in 1 inute IA lae ie ie 0 to in 1 inute IA reure 0 to 00 ar (0 0 i) 1 ar ( i) urace Interal ie 000 to 2 rin 1 inute ie to l eaturate 20 to 000 rin 1 inute * starting 10 min after the dive eerature 18 to 0 (0 to ) 1 ie o a 000 to 2 rin 1 inute iolation ounton ier 20 to 000 rin 1 inute

Max Functional Depth: Limit: I 100 (0 ) A 120 ( )

ABBREVIATIONS/TERMS

A Actiation etric AL Alar aiu unctional et (equient liit) AL Alternate I inute (tie) A ar ra Acent ate aiu erating et AA tanar Atoere (unit) 2 itrogen A Auile Alar 2 ar ra iue Loaing ar ra A atter L o ecoreion Liit oneratie o ecoreion L lear 2 gen ecoreion icne 2 I gen ie eaining () ecoreion 2 A gen aturation ee to eronal outer (onloa) ie ie eaining LA ie lanner lae ie ie 2 artial reure o 2 (AA) L leation (altitue) A aet (to) L ie o l A eaturation ie FO2 = Fraction of Oxygen (%) A ea Leel eet (et) econ (tie) AAA igital auge ie oe L lo on a ie eaining erial uer 2 ater uerile reure auge I itor ale ate I Ierial (eaure) aet to LA reiou (ie) urace eter (et) ie o urace () ont a (a ont) IIL iolation

AQUA LUNG DISTRIBUTORS

Lit aailale at tt.aqualung.coitriutorintl.tl.