Tusa TC1 User manual

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The CE mark is used to mark conformity with the European Union
EMC directive 2014/30/EU.
IN-TC1-EN-1ST
TUSA TC1 ( IQ1301 ) DIVE COMPUTER
USER GUIDE
【
1st/en
】

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■■■■■■■■■ USER GUIDE【1st.】
Thank you for choosing the TUSA TC1(IQ1301) Dive Computer.
◆This dive computer does not conform to Dive watches (100m) stated in the
ISO6425 and JISB7023.
Applications
This is a dive computer to support no decompression diving safely. The TUSA
TC1(IQ1301) functions as a watch, alarm, timer, stopwatch. In Dive Mode,
information of water depth, water temperature, dive time, ascent rate and
decompression are provided. When divers exceed no decompression limits, the
dive computer will show audible and visual alarms.
Comprehensive accelerated decompression is possible because each fraction of
oxygen (O2) % can be set from 21% to 56% in 1% increments.
The calculation model used for decompression is based on the decompression
theory of Dr. A. Buhlmann (ZHL-16C).
Before use, you need understand all warnings and cautions of the dive computer
written in this Instruction Manual. To avoid any serious accidents, please make
sure to read and fully understand the dive computer and its functions.
Understanding and using the functions of the dive computer ensures your safe
diving.

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Safety Precautions
Please read the following before use.
TUSA shall assume no responsibility on damage, 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 you understand how to use the warnings, and cautions of this dive
computer within this Instruction Manual before use.
• Before using the dive computer for scuba diving, you must first complete a dive
training course, and obtain a certification card issued by an internationally
acknowledged dive training organization.
• Before using the dive computer with Enriched Air Nitrox (EANx), you must first
receive certification in an Enriched Air Nitrox (EANx) dive training course.
(EANx: Enriched Air Nitrox (commonly called Nitrox). Contains mixed gas with
higher O2% than normal compressed air (O2is 21%) )
• If “Decompression stop violation” warning and/or “Out of measurement range”
warning is activated, discontinue diving. Monitor your health and seek medical
attention if necessary.
• When you notice abnormal conditions on the dive computer, immediately stop
using it and contact your retailer or TUSA for assistance.

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• Always follow the display warnings, messages, and cautions on the dive
computer.
• When using dive computers, it is recommended to use a back-up dive
computer, dive watch, and/or depth and pressure gauge.
• This dive computer is to be used for recreational diving only. Do not use this
dive computer for any other type of diving.
• Never lend or share dive computers as residual nitrogen may still exist in the
body after use of the dive computer.
• Make sure to set the O2% for every dive. It is extremely dangerous if the O2% in
the scuba cylinder does not match the computer setting.
• Dot not disassemble, attempt repair, modify, exchange the battery or conduct
pressure chamber tests on the dive computer.
• Before any dive, always check your dive computer status, complete all related
settings and check for sufficient battery power.
• Have your dive computer checked by a TUSA technician once a year or before
any major trip.
• The dive computer may be set to air with O221 % and Nitrox (EANx) gas with
O222-56%. The dive computer cannot be used with any other mixed gas type.
• Divers should be responsible in planning safe diving while considering current
conditions.
• Dive with caution. DO not exceed the computers limits. Exceeding the
computers limits may put you at risk of decompression sickness (DCS).
• The dive computer does not measure or display the tank air pressure. Use a
pressure gauge to monitor your air consumption.
• Do not remove the battery from the dive computer. Return the unit to the
manufacturer for service of the battery if necessary.
• The battery may pose as a choking hazard. Keep out of reach of children.

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To prevent leakage, heat, smoke, fire, explosion of battery,
l Do not charge, use, or leave this product in the excessive heat such as
near a fire, blazing sun, or excessive low temperature.
l Do no throw this product in a fire or heat.
l Do not expose in excessive impact or external force such as nailing.
CAUTION!
• Estimate Memory Capacity: *900 dives.
(*Estimated dives storage calculation is based on 40 minutes to 50 minutes per
dive. Actual dive log capacity may vary based on actual dive time.)
When the storage capacity is reached, Scuba Mode, FREEDIVING Mode and
Gauge Mode will remain locked. Please contact your retailer when your DIVE
LOG is over 800dives or 32,000min (total dive time).
Once executing LOG CLEAR, all dive logs and history information will be
deleted.
《CHARGING》
• To charge your TUSA TC1(IQ1301) dive computer, first plug the cable into the
Clip using a safe, qualified USB adaptor; then connect it to the power supply.
Do not use unsafe, unqualified USB adaptors.
• Match the Clip to the contact points on the back of TUSA TC1(IQ1301). Once
it’s in place, you should see the motion indicator of battery on the monitor.

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TUSA TC1 (IQ1301) Dive Computer User Guide
1. SCREEN AND FUNCTIONS 7
1.1 Button function 7
1.2 MENU 8
1.3 WATCH Mode and Dive History & System Information 11
1.3.1 WATCH Mode 11
1.3.2 Dive History & System Information 13
1.3.3 WATCH Mode SETTINGS 14
1.4 SCUBA Mode and SETTINGS 19
1.4.1 SCUBA Mode 19
1.4.2 SCUBA Mode SETTINGS 24
1.5 FREEDIVING Mode and SETTINGS 31
1.5.1 FREEDIVING Mode 31
1.5.2 FREEDIVING Mode SETTINGS 33
1.6 GAUGE Mode 37
1.7 PLAN Mode 39
1.8TIMER Mode 41
1.9 LOG Mode 42
1.10 SETTINGS Mode 43
2.SPECIFICATION 47

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1. Screen and Functions
1.1 Button function
‧Name:
POWER
Button
‧Function:
Power
Switch/ Exit
‧Name:
UP Button
‧Function:
Move Pointer
Up / Access more
Settings
‧Name:
MODE Button
‧Function:
MENU/ Select/
Enter Value
‧Name:
DOWN Button
‧Function:
Move Pointer
Down / Access
Dive History &
System
Information (Under
WATCH Mode)

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1.2 MENU
1.2 MENU
WATCH Mode
●To Access: From default time screen,
press MODE button. Move cursor with
UP or DOWN buttons to position at
WATCH and press MODE button again
to enter WATCH mode.
●To Exit : Press POWER button once.
SCUBA Mode
●To Access: Under MENU, move cursor
with UP or DOWN buttons to position
at SCUBA and press MODE button
again to enter SCUBA Mode (preview).
Please refer to 1.4 for details.
●To Exit: Press POWER button once.
FREEDIVING Mode
●To Access: Under MENU, move cursor
with UP or DOWN buttons to position
at FREE and press MODE button again
to enter FREEDIVING Mode (preview).
Please refer to 1.5 for details.
●To Exit: Press POWER button once.
GAUGE Mode
●To Access: Under MENU, move cursor
with UP or DOWN buttons to position
at GAUGE and press MODE button
again to enter GAUGE Mode (preview).
Please refer to 1.6 for details.
●To Exit: Press POWER button once.

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1.2 MENU
PLAN Mode
●To Access: Under MENU, move cursor
with UP or DOWN buttons to position
at PLAN and press MODE button again
to enter PLAN Mode (preview).
Please refer to 1.7 for details.
●To Exit: Press POWER button once.
TIMER Mode
●To Access: Under MENU, move cursor
with UP or DOWN buttons to position
at TIMER and press MODE button
again to enter TIMER Mode.
Please refer to 1.8 for details.
●To Exit: Press POWER button once.
LOG (Dive Logs) Mode
●To Access: Under MENU, move cursor
with UP or DOWN buttons to position
at LOG and press MODE button again
to enter LOG Mode.
Please refer to 1.9 for details.
●To Exit: Press POWER button once.
SETTINGS Mode
●To Access: Under MENU, move cursor
with UP or DOWN buttons to position
at SETTINGS and press MODE button
again to enter SETTINGS Mode.
Please refer to 1.10 for details.
●To Exit: Press POWER button once.

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1.2 MENU
Maintenance Mode
This mode is used for inspection and
maintenance service at factory. It is
locked and user cannot use it.

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1.3 WATCH Mode and Dive History & System
Information
1.3.1 WATCH Mode
Default mode when your turn on.
To Access: Under MENU, press MODE
button to select WATCH mode or press
POWER button to go back to default.
Upper: ANALOG FACE
Lower: DIGITAL FACE
Events during this function:
1. Default Status: Default display Once
you turn on the dive computer.
Under this status, dive computer will
show default display with backlight
on.
2. Standby Status: Once you cease
operating the dive computer after 30
seconds under Default Status, dive
computer will enter Standby Status
automatically. Under this status, dive
computer will show default display
without backlight.
●If you would like to wake up the
backlight, simply press any buttons.
3. Sleep Status: Once you cease
operating the dive computer for 5
minutes, 10 minutes, or 30 minutes
(You can change the time Setting)
under Standby Status, dive
computer will enter Sleep Status
automatically. Under this status, dive
computer will not show default
display and backlight will remain
dark. You may wake up dive
computer by twisting it over 45
degrees for 1 second to 2 seconds
to activate or press any button.
●If you twist it to activate, dive
computer will show default display
with backlight on for 30 seconds
and resume Sleep Status.

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1.3.1 WATCH Mode
●If you press any key to activate,
dive computer will resume Default
Status.
4. Auto Shutdown Status: Once you
cease operating the dive computer
24 under Sleep Status, dive
computer will enter Auto Shutdown
Status automatically.
●If you need to operate dive
computer, please press Power
Button to activate.
WARNING: Before any dive, always
check your dive computer status,
complete related settings and go back
to Watch mode for dive computer to
automatically start when you enter
water.
Displays No FLY Reminder and NO DIVE
Reminder after dives executed under
SCUBA Mode and/or GAUGE Mode.
1. No FLY Reminder: if this icon
shows on the screen, DO NOT
take flights or head to high altitude
environment. For exact No FLY
recommendation time countdown
please check Dive History page.
2. NO DIVE Reminder: if this icon
shows on the screen, DO NOT
continue diving activities. For
exact NO DIVE recommendation
time countdown please check
Dive History page.
SCUBA Mode, FREEDIVING Mode and
PLAN Mode will remain locked during NO
DIVE recommendation time countdown.
●N2 Indicator: Risk degree of nitrogen
accumulated in the body is shown with
1 to 10 levels

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1.3.2 Dive History & System Information
LAST DIVE
●To Access: Under WATCH Mode,
press DOWN button once.
Displays latest dive log:
Calendar Date, Time leaving the water;
NO FLY: No FLY recommendation time
countdown;
NO DIVE: NO DIVE recommendation time
countdown;
SI: Surface Interval time counting
(continues until diver starts a new dive).
SCUBA HISTORY
●To Access: Under WATCH Mode,
press DOWN button twice.
Displays dives under SCUBA Mode:
DIVES: Dive counts
TIME: Accumulated dive time
(clock : minute)
DEPTH: Maximum depth of all scuba
dive logs
TC1 Estimate Memory Capacity: *900
dives. (*Estimated dives storage
calculation is based on 40 minutes to 50
minutes per dive. Actual dive log capacity
may vary based on executed dive time.)
When the storage capacity is reached,
Scuba Mode, FREEDIVING Mode and
Gauge Mode will remain locked. Please
contact your retailer when your DIVES is
over 800 or TIME is over 32,000 mins
Once executing LOG CLEAR, all dive logs
and history information will be deleted.

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1.3.2 Dive History & System Information
FREEDIVING HISTORY
●To Access: Under Watch Mode, press
DOWN Button three times.
Displays dives under FREEDIVING
Mode:
DIVES: Dive counts
DEPTH: Maximum depth of all
FREEDIVING logs
LOT: The longest time of all FREEDIVING
logs
VERSION
●To Access: Under Watch Mode, press
DOWN Button four times.
Displays system information of dive
computer.
HW: Hardware version of dive computer
SW: Software version of dive computer
SN: Serial Number of dive computer
1.3.3 WATCH Mode SETTINGS
DATE Settings
●To Access: Under WATCH Mode,
press the UP button once, and press
UP/ DOWN button to locate the cursor
at DATE and then press MODE button
once to select the desired settings. The
values at the bottom of the screen will
blink.
Changes the values of 3 groups of digits
corresponding to Month, Day and Year
using UP/ DOWN button to select and
accept the selection with MODE button.

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1.3.3 WATCH Mode SETTINGS
DATE FORMAT Settings
●To Access: Under WATCH Mode,
press the UP button once, and press
UP/ DOWN button to locate the cursor
at FORMAT and then press MODE
button once to select the desired
settings. The values at the bottom of
the screen will blink.
Changes the order in which the Day,
Month and Year are displayed on dive
computer to accommodate the region of
the world you live in. Use UP/ DOWN
button to select and accept the selection
with MODE button.
Default: YYMMDD
Setup range:
YYMMDD/DDMMYY/MMDDYY
TIME Settings
●To Access: Under WATCH Mode,
press the UP button once, and press
UP/ DOWN button to locate the cursor
at TIME and then press MODE button
once to select the desired settings. The
values at the bottom of the screen will
blink.
Changes the values for Hours and
Minutes so the correct time can be
displayed on dive computer. Use UP/
DOWN button to select and accept the
selection with MODE button.
Note:
Before adjusting TIME, please finish
UTC Settings first.
Please be aware that this dive
computer will not self-adjust for
daylight saving time.

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1.3.3 WATCH Mode SETTINGS
UTC Settings (Coordinated Universal
Time Settings)
●To Access: Under Watch Mode, press
the UP button once, and press UP/
DOWN button to locate the cursor at
UTC and then press MODE button
once to select the desired settings. The
values at the bottom of the screen will
blink.
Change the values corresponding with
your particular time zone with the UP/
DOWN button and accept the selection
with MODE button.
Default: UTC+8.
Setup range: UTC -12 ~ +12.
Note:
Make sure you edit your CORRECT
UTC + or - hours for your particular
time zone first then go to settings
again and, if needed, edit your TIME
settings. If you do it backwards, time
will not coincide & information will be
inaccurate.
12 / 24 Hours Settings
●To Access: Under Watch Mode, press
the UP button once, and press UP/
DOWN button to locate the cursor at
12H/24H and then press MODE button
once to select the desired settings. The
values at the bottom of the screen will
blink.
Use UP/ DOWN button to select and
accept the selection with MODE
button.
Default: 24H
Setup range: 12H / 24H

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1.3.3 WATCH Mode SETTINGS
AUTO MODE (Auto Active Mode at
depth)
●To Access: Under Watch Mode, press
the UP Button once, and press UP
Button / DOWN Button to locate the
cursor at AUTO MODE and then press
MODE Button once to select the
desired settings. The values at the
bottom of the screen will blink.
Auto Active Mode will be the automatic
default mode dive computer access
immediately after it senses a depth of at
least 1.0 m (3.3 ft.).
Default: SCUBA (SCUBA Mode)
Setup range:
SCUBA Mode, FREEDIVING Mode, or
GAUGE Mode
LOG START (Log Start at Depth
Setting)
●To Access: Under WATCH Mode,
press the UP button once, and press
UP/ DOWN button to locate the cursor
at LOG START and then press MODE
button once to select the desired
settings. The values at the bottom of
the screen will blink.
Default: 1.0 m (3.3 ft.)
Setup range:
1.0 m (3.3 ft.), 1.5 m (4.9 ft.), 2.0 m (6.6
ft.), 2.5 m (8.2 ft.), 3.0 m (9.8 ft.)
Note:
This setting will automatically apply to
SCUBA Mode, GAUGE Mode and
FREEDIVING Mode.

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1.3.3 WATCH Mode SETTINGS
LANGUAGE Settings
●To Access: Under WATCH Mode,
press the UP button once, and press
UP/ DOWN button to locate the cursor
at LANGUAGE and then press MODE
button once to select the desired
settings. The values at the bottom of
the screen will blink.
Default: ENG (English).
Setup range:
ENG (English), CH (Traditional Chinese),
SPN (Spanish)
FACE Settings
●To Access: Under WATCH Mode,
press the UP button once, and press
UP/ DOWN button to locate the cursor
at FACE and then press MODE button
once to select the desired settings. The
values at the bottom of the screen will
blink.
Default: ANALOG.
Setup range:
ANALOG, DIGITAL
EXIT
●To Access: Locate the cursor at EXIT
and then press MODE button to resume
WATCH screen.

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1.4 SCUBA Mode and SETTINGS
1.4.1 SCUBA Mode
SCUBA Mode – UI (User Interface)
Setting
●To Access: Under SCUBA Preview
Mode, press UP button Or from
SETTINGS, press UP/ DOWN Button to
locate the cursor at UI and then press
MODE button to select.
One of the sampling options will be
blinking at the bottom. Press the Up/
Down buttons to select other sampling
options as needed. Press the MODE
button to accept your selection.
Default: NORMAL (NORMAL Display)
Setup range:
NORMAL (NORMAL Display) /
SIMPLE(SIMPLE Display)
SIMPLE Display
NORMAL Display
SCUBA Preview Mode
:Battery Status
OC: Open-Circuit Scuba
000.0 m: Current depth.
SF: Safety Factor.
Default: SF1(Normal)
Setup range:
SF1 (Normal), SF2 (Conservative).
PO2: Current setup of PO2(partial
pressure of oxygen).
Default: 1.4.
Setup range: 1.2 - 1.6.
MOD: Maximum Operating Depth
suggestions.
O2%: Oxygen percentage value.
Default: 21%.
DIVE TIME (SIMPLE Display) / TIME
(NORMAL Display): Dive time

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1.4.1 SCUBA Mode
SIMPLE Display
NORMAL Display
SCUBA Mode Underwater
18.6m (DEPTH): Current Depth
NDL: The Non-Decompression Limit time
in minutes, will show 99 when NDL
exceeds 99 minutes.
：
Ascent speed
(03 means 3meter/minute)
If diver exceeds 10meter/minutes,
there will be alarm warning (short
beeping repeated) with vibration.
：
Descent speed (in meter/minute)
09:35: Current time.
DIVE TIME (SIMPLE Display) / TIME
(NORMAL Display): Dive time
TEMP: Water temperature.
●N2 Indicator: Risk degree of nitrogen
accumulated in the body is shown with
1 to 10 levels (Only SIMPLE Mode)
SIMPLE Display
NORMAL Display
SCUBA Mode – SAFETY STOP
(When the NDL has not been exceeded)
DEPTH (Current Depth)
5.6m(SIMPLE Display)
005.6m (NORMAL Display)
SFTY
・
STOP (SIMPLE Display) / STOP
(NORMAL Display): When divers ascend
to 5m (16.4 ft), diver computer will start
Safety Stop countdown of 5 minutes
automatically. If diver do not complete
Safety Stop and ascent, there will be
alarm warning (short beeping repeated)
with vibration, and this dive will end
according to LOG STOP settings.
COUNT (SIMPLE Mode) / STOP
(NORMAL Mode): Safety Stop
countdown