Tusa DC-Solar IQ 1204 User manual

DC-SolarIQ1204DiveComputer
Owner’sManual
1st.
EN60950-1/EN300 328/EN301 489-1/EN301 489-17/EN62479/
EN13319*
* when you switch to Manual Dive Mode
The CE mark is used to mark conformity with the European Union
EMC directive2004/108/EC.

1
Thank you for your selection of the TUSA IQ-1204 Dive Computer.
◆This dive computer does not conform to
the diver watches(100m) stated in the ISO6425 and JISB7023.
Applications
This is a dive computer to support no decompression dive safely.
Solar panel generates electric power to run the dive computer.
It has multi-functions as watch, alarm, timer, stopwatch, direction
compass and angle, world time watch in the Time mode, and
surface interval time and desaturation time (DESAT time) in surface
interval. In the Dive Mode, information of water depth, water
temperature,dive time, ascent speed and decompression are
provided. When divers exceeds no decompression limit, the dive
computer gives divers alarm with display.
IQ1204 is compatible with a mixture of four different Nitrox gases.
Comprehensive accelerated decompression is possible because
each fraction of oxygen (FO2)% can be set from 21% to 100% in
1% increments.
The calculation model we use for the decompression program of
the dive computer is based on the decompression theory of Dr. A.
A. Buhlmann.
Before use, you need understand how to use, all warnings and
cautions of the dive computer written on this Instruction Manual.
To avoid any serious accidents, please make sure to read and fully
understand the dive computer. If you have any questions, please
ask the shop you purchased the dive computer.
Whenever there is something you do not know in how to use the
dive computer, we strongly recommend that you access the TUSA
website and read this instruction manual carefully.
Understanding and using the functions of the dive computer
ensures safe dive you can enjoy.

2
Safety Precautions
Please read the followings before use.
TUSA shall assume no responsibility on damages, lost profit
and/or any claims caused in use or by malfunctions of this dive
computer from customers and any third parties.
Danger
• Make sure to understand how to use, warnings, and cautions
of this dive computer with this Instruction Manual completely
before use. Confirm that you understand how to use the dive
computer in closed water as in a pool before using in open
water.
• When using the dive computer in scuba diving, you need to take
dive training course both in learning rules and practical skills,
and obtain C card (certification card) issued by internationally
acknowledged dive training organizations beforehand. (You
can use the dive computer in the training under the guidance of
instructors of such organizations)
• When using the dive computer in Nitrox (EANx) dive, you need
to take Nitrox (EANx) dive training course and complete it
beforehand. Otherwise, do not use the dive computer in Nitrox
(EANx) dive.
Ref: EANx: Enriched Air Nitrox (commonly called Nitrox).
It is mixed gas with higher FO2% than normal compressed air
(FO2is 21%)
• If “Decompression stop violation” warning and/or “Out of
measurement range” warning are released, cancel dive for a day
and pay attentions on changes of your physical condition.
• When you notice abnormal conditions on the dive computer,
stop using it immediately and contact the shop you purchased
the dive computer.

3
• Check the battery power level is “H” before dive. If power level
gets low and warning (WARNING!! BATT) is released while dive,
exit as soon as possible and recharge the dive computer.
●Even this warning is released in dive, enough power for dive
remains. Deal with the situation calmly without panic.
Ref. Power Levels … P.13
• Follow the displayed warnings and messages for cautions on the
dive computer at once.
• When using the dive computer, also use other devices as
another dive computer, divers watch, and depth indicator
together as backup tool.
• The dive computer is to be used for recreational dive only.
Do not use the dive computer for any other dive.
• Never lend or share the dive computer with anyone else if
residual nitrogen still exists in the body after use of the dive
computer.
• Make sure to set FO2% in every dive. It is extremely dangerous
if FO2% in tank and in the dive computer don’t match.
• Dot not disassemble, repair, modify, exchange the secondary
battery or conduct pressure chamber test on the dive computer
by yourself. This will be extremely dangerous since doing this
without sufficient knowledge causes malfunction.
• Check out the dive computer by yourself once a year regardless
of frequency of use. Especially, check it out definitely when you
have not used the dive computer for more than 3 months since
last dive season.

4
• The dive computer is applicable to the air with FO221 % and
Nitrox (EANx) gas with FO222-100%. (4 mixture gases are
available). The dive computer can not be used with any other
mixed gas.
• Each diver should be responsible in planning and conducting of
safety dive according to each diver’ s condition.
• Please try cautious dive not exceeding the displayed data in
the dive computer. The dive computer can not prevent from
developing decompression illness completely.
• The dive computer does not measure, display and control the
air pressure in tank. Use the residual air pressure indicator and
check it by yourself.
• When removing the secondary battery from the dive computer,
be careful for small children not to swallow it. Put the battery out
of reach of children. If swallowed, contact a doctor at once.
• Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type.
• Do not exposed to excessive heat such as direct sunshine in
the car, near the heater, fire or the like.
CAUTION!

5
Contents
1. About This Instruction Manual ............................................ 10
2. Things To Check Before Using The Dive Computer.......... 10
3. Charging the Dive Computer ............................................... 11
Charging Guide........................................................................................ 11
Power Levels ........................................................................................... 13
Power Recovery Mode ............................................................................ 14
Charging Times........................................................................................ 15
Power Saving........................................................................................... 16
To Recover From The Sleep State........................................................... 16
Low Power Alarm..................................................................................... 17
4. Mode Reference Guide ........................................................ 18
Selecting A Mode .................................................................................... 19
General Functions (All Modes)................................................................. 20
Auto Return Features............................................................................... 20
Initial Screens .......................................................................................... 20
Scrolling................................................................................................... 20
5. Timekeeping.......................................................................... 21
6. Configuring Home City Settings.......................................... 22
To configure Home City and Daylight Saving Time Settings................... 22
7. Configuring Current Time and Date Settings..................... 23
To Change The Current Time And Date Settings .................................... 23
Specifying Temperature and Depth Display Units................................... 24
8. Displays In The Surface Mode............................................. 26
9. Dive Mode (DIVE) .................................................................. 27
How To Switch The Mode To Dive Mode................................................ 27
No Decompression Mode........................................................................ 28
Safety Stop .............................................................................................. 29
What Makes “Safety Stop Function” End................................................ 29
No Decompression Limit (NDL) Warning................................................. 30
Decompression Dive................................................................................ 30
The Below Information Is Shown In Decompression Dive....................... 31
Warnings In Dive...................................................................................... 32
Ascent Rate ............................................................................................. 32

6
Warning Of Three Minutes To Decompression........................................ 32
Decompression Dive................................................................................ 32
Decompression Stop Violation ................................................................ 33
Out Of Measurement Range.................................................................... 34
O2Indicator (OLI) ..................................................................................... 35
PO2.......................................................................................................... 35
M Value.................................................................................................... 36
Nitrox (EANx) Dive ................................................................................... 36
End Of Dive.............................................................................................. 37
Dive At High Altitude................................................................................ 38
10. Log Mode (LOG).................................................................... 39
How to use L) Log Button
(Dive Log, Dive Profile, Dive History Mode, Bluetooth log data transfer) 39
(Scuba) Dive Log Mode ........................................................................... 40
Dive log confirmation............................................................................... 41
How to view the log data ......................................................................... 41
Button operation...................................................................................... 42
Oxygen concentration ............................................................................. 43
Warnings recorded in the log................................................................... 43
Dive Profile Mode .................................................................................... 44
Confirm dive profile.................................................................................. 44
Dive History Mode / Free Diving History Mode ....................................... 46
Dive History.............................................................................................. 46
Free Diving History .................................................................................. 47
Dive history clear / Dive number edit function......................................... 48
Dive profile sampling time settings.......................................................... 48
Setting method ........................................................................................ 48
O2profile save settings............................................................................ 49
Setting method ........................................................................................ 49
Bluetooth (BLE) data transfer mode ........................................................ 50
11. Plan Mode (PLAN)................................................................. 52
Plan Dive.................................................................................................. 52
Enriched Air, Nitrox Diving....................................................................... 53
FO2% Setting ........................................................................................... 54
Default...................................................................................................... 55
Oxygen-Pressure Warning And Bodily Oxygen Quantity Warning.......... 55
Bodily Oxygen Quantity Warning............................................................. 56
Oxygen Partial Pressure Warning............................................................ 56

7
Multiple Gas Settings Diving (Accelerated Decompression) ................... 57
How to switch the gas ............................................................................. 57
Regarding The Accelerated Decompression Log.................................... 58
Set Safety Factor ..................................................................................... 58
Safety Factor setting................................................................................ 59
Set M Value Warning ............................................................................... 60
Depth Interval Alarm ................................................................................ 61
Setting Of Depth Interval Alarm ............................................................... 61
Setting Range .......................................................................................... 62
Maximum Water Depth Warning Settings ............................................... 62
Setting Method ........................................................................................ 62
Setting Range .......................................................................................... 63
UPTD Pulmonary Oxygen Poisoning Units (Total Minutes Per Day/Week)
Display ..................................................................................................... 63
12. Using The Compass ............................................................. 65
To Take A Direction Reading ................................................................... 65
Digital Compass Readings ...................................................................... 66
Calibrating The Bearing Sensor............................................................... 67
Bidirectional Calibration........................................................................... 67
Precautions About Bidirectional Calibration............................................ 67
To Perform Bidirectional Calibration........................................................ 68
Digital Compass Precautions .................................................................. 69
Magnetic North And True North .............................................................. 69
Location ................................................................................................... 69
Storage .................................................................................................... 70
13. Using The Stopwatch ........................................................... 71
To Enter The Stopwatch mode................................................................ 71
To Perform An Elapsed Time Operation.................................................. 71
14. Using The Countdown Timer ............................................... 73
To Enter The Countdown Timer Mode .................................................... 73
To Specify The Countdown Start Time.................................................... 73
To Perform A Countdown Timer Operation............................................. 74
To Stop The Alarm................................................................................... 74
15. Using The Alarm.................................................................... 75
To Enter The Alarm Mode........................................................................ 75
To Set An Alarm Time.............................................................................. 76
To Turn An Alarm And The Hourly Time Signal On And Off .................... 77

8
To Stop The Alarm................................................................................... 77
16. Checking The Current Time In A Different Time Zone ...... 78
To Enter The World Time Mode............................................................... 78
To View The Time In Another Time Zone................................................. 78
To Specify Standard Time Or Daylight Saving Time (DST)
For A City................................................................................................. 79
17. Illumination............................................................................ 80
To Turn On Illumination Manually ............................................................ 80
To Change The Illumination Duration ...................................................... 81
About The Auto Light Switch................................................................... 82
To Turn The Auto Light Switch On And Off ............................................. 83
Illumination Precautions........................................................................... 84
Auto Light Switch Precautions ................................................................ 84
18. Other Settings ....................................................................... 85
To Turn The Button Operation Tone On And Off..................................... 85
To Turn Power Saving On Or Off............................................................. 86
Dive Mode Screen Setting (To select the basic screen in dive) .............. 87
Mode Switching ON/OFF Setting ............................................................ 87
19. Free Diving (FREE) Mode ..................................................... 88
Switch To Free Diving Mode.................................................................... 88
End of Free Diving Mode ......................................................................... 89
Free diving functions ............................................................................... 89
Button operation (underwater / water surface)........................................ 90
Session history ........................................................................................ 91
Log of maximum water depth for session ............................................... 91
Log of longest dive time for session........................................................ 92
Compass / StopTime............................................................................... 92
Free Diving Log........................................................................................ 92
How to read log data ............................................................................... 93
Free Diving History .................................................................................. 93
20. Gauge Mode .......................................................................... 94
Setting Of Gauge Mode........................................................................... 94
Canceling Gauge Mode ........................................................................... 95
21. Troubleshooting.................................................................... 96
Time Setting............................................................................................. 96
Dive Mode and Surface Mode................................................................. 96

9
World Time Mode .................................................................................... 99
Charging .................................................................................................. 99
23. Specification........................................................................ 101
Accuracy at normal temperature ........................................................... 101
Timekeeping .......................................................................................... 101
Calendar system.................................................................................... 101
Other...................................................................................................... 101
Sensor precision: ................................................................................... 101
FO2% .................................................................................................... 101
Water proof............................................................................................ 102
Max. dive log ......................................................................................... 102
Digital Compass..................................................................................... 102
Bearing Sensor Precision ...................................................................... 102
Stopwatch.............................................................................................. 102
Countdown Timer .................................................................................. 102
Alarms.................................................................................................... 102
World Time............................................................................................. 102
Other...................................................................................................... 103
Illumination............................................................................................. 103
Power Supply......................................................................................... 103
City Code Table ..................................................................................... 104