NiTek Trio
Dive Computer
User Guide
www.diverite.com
Date of Purchase _________________
Content
DEVELOPED
BY
Dive Rite
175 NW Washington Street
Lake City, FL 32055
Phone: 386.752.1087
Fax: 386.755.0613
Web: www.DiveRite.com
COPYRIGHT
NOTICE
Copyright © 2009 Lamartek, Inc. dba Dive Rite
WARRANTY
INFORMATION
Dive Rite will—at its sole discretion—repair or replace NiTek
Trio components proved to be damaged by faulty manufacture
or material, at no cost, for a period of up to one year (365
days) from the date of purchase.
This manual is copyrighted by Lamartek, Inc. dba Dive Rite.
You may not reproduce, translate, transcribe, or transmit any
part of this manual without express, written permission from
Lamartek, Inc. dba Dive Rite.
This warranty applies only to the original retail purchaser. It
does not cover commercial or rental use, nor does it extend to
units purchased from other than an authorized Dive Rite
dealer.
This warranty specifically excludes battery depletion or other
conditions resulting from misuse, negligence, alteration,
accident, or unauthorized repair.
To make a claim under this warranty, the owner must have
registered his/her warranty using Dive Rite’s website
(www.diverite.com). He or she must then return the damaged
items to Dive Rite, along with a copy of the original purchase
invoice or receipt. No warranty service will be performed for
other than registered owners.
This warranty becomes void if NiTek Trio components are
damaged by anything other than normal recreational diving
use, or if they have been serviced or repaired by other than
authorized Dive Rite dealers.
Repairs made under this warranty will not extend the warranty
period.
All further claims, especially for damage after diving accidents,
are excluded from coverage under this warranty.
Dive Rite has no obligation to honor any extension of this
warranty.
This warranty is in lieu of all other warranties, expressed or
implied. No other person or representative is authorized to
assume for Dive Rite any other liability in connection with the
sale of this product.
NiTek Trio Dive Computer User Manual v1.2
i
Content
Table of contents
Chapter 1
Introduction•1
Overview•2
Features and Functions•3
Specifications•5
Warnings•6
Chapter 2
Using the NiTek Trio•9
Getting Started•10
Accessing display modes and
screens•11
Time Display mode•12
Compass Set and Display mode•14
Dive Option Set and Display mode•16
Plan mode•26
Dive Computer mode•28
Gauge mode•37
Log mode•38
Profile mode•40
History mode•42
PC Transfer mode•43
Surface mode (Upon Surfacing From a
Dive)•44
Altitude operation•46
Chapter 3
Care and Maintenance•48
Proper handling techniques•49
Low battery warning•50
Index•51
ii
NiTek Trio Dive Computer User Manual v1.2
Chapter 1
Introduction
Summary
This chapter provides an overview of the NiTek Trio, lists the
NiTek Trio’s features and functions, and covers warning
information that should be read before using your NiTek Trio.
Content
Overview • 2
Features and functions • 3
Specifications • 5
Warnings • 6
When diving… • 7
NiTek Trio Dive Computer User Manual v1.2
1
Introduction
Overview
Congratulations on your purchase of the NiTek Trio dive
computer. The NiTek Trio is a sophisticated and comprehensive
dive computer that was designed to offer you the latest in dive
computer technology, safety, and reliability.
The NiTek Trio dive computer is a multifunctional computer for
recreational diving, providing information on depth, dive times,
no-decompression and decompression times, and nitrogen and
oxygen absorption and elimination during all dive phases,
including ascent, surface interval times, and subsequent dives.
This information is displayed on an easy-to-read display,
providing simple and direct communication between the diver
and the computer. With an easy-to-read display, the diver has no
problem following and reading the displayed information.
The NiTek Trio comes standard with a number of modes,
including a time mode, dive set mode, dive plan mode, log
mode, profile mode, PC transfer mode, compass mode and dive
mode.
Note: It is extremely important that you carefully read and
understand this manual. Make sure you fully understand how the
NiTek Trio operates before diving with it.
This manual has been divided into three chapters:
•
Introduction: Covers the features and functions,
specifications, and warnings for the NiTek Trio
•
Using the NiTek Trio: Covers the operation of each mode
for the NiTek Trio
•
Care and maintenance: Covers how to properly care for
and maintain the NiTek Trio and change the battery
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NiTek Trio Dive Computer User Manual v1.2
Introduction
Features and Functions
The NiTek Trio incorporates a number of important modes and
features:
•
The NiTek Trio turns on automatically upon descent.
•
On the surface, the NiTek Trio displays a minimum of date,
time and temperature when activated.
•
To conserve battery life, the NiTek Trio will enter the
“Sleep” mode after several minutes of inactivity.
•
The NiTek Trio uses easily accessible and highly reliable
push buttons instead of exposed electrical contacts.
•
The NiTek Trio can be programmed to monitor exposure to
up to three different gas mixtures during a dive. All three
mixes are programmable for mixtures ranging from air
(EAN21) to EAN99. Underwater, NiTek Trio users can
switch between mixes at the push of a button.
•
The NiTek Trio is capable of functioning up to a depth of
328 feet (100 meters) when in dive computer or gage mode
•
The NiTek Trio automatically adjusts for altitudes up to
19,685 feet (6,000 meters)
•
The NiTek Trio has a digital compass integrated into the
front-panel dot-matrix display
•
The NiTek Trio displays a variety of data underwater
including: date, time of day, current and maximum depths,
no-decompression dive time elapsed and remaining, compass
heading, and water temperature
•
The NiTek Trio displays data specifically related to the use
of Enriched Air Nitrox (EANx) including: fraction of
oxygen (FO2) setting, partial pressure of oxygen (PO2), and
an oxygen limit index (OLI) representing the cumulative
effect of a diver’s exposure to elevated PO2s (the theoretical
“CNS clock”) as a bar graph
•
Through a combination of audible and visible alarms, the
NiTek Trio helps to alert the diver to a number of possibly
hazardous situations including: violation of ascent rate, nodecompression state, and whether mandatory decompression
NiTek Trio Dive Computer User Manual v1.2
3
Introduction
stops are necessary or if the diver has ascended above a
mandatory stop ceiling. Nitrox specific warnings occur when
the diver approaches or exceeds a limiting PO2 of 1.6
atmospheres for all mixtures, and when cumulative exposure
to elevated PO2s exceeds recommended limits.
•
The NiTek Trio can calculate decompression stop
requirements for stops as deep as 90 feet (27 meters)
•
The NiTek Trio can be programmed to display data in
Imperial or metric units
•
Dive depth can be displayed in fresh or salt water
equivalents
•
Special mode indicators make it easy to determine what
display mode or screen you are in at any time
•
The NiTek Trio has a back light to illuminate the screen,
which can be turned on with the touch of a button
•
The NiTek Trio’s memory capability enables it to hold and
display log data on up to 30 hours of dive time or 60 dives
•
Detailed dive-profile information can be stored for each dive
through user-programmable sample intervals of 10 or 30
seconds (longer intervals allow data for a greater number of
dives)
•
Dive data can be uploaded and stored in a dive log format on
a desktop or laptop computer using the NiTekLogic™
software and optional PC interface
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NiTek Trio Dive Computer User Manual v1.2
Introduction
Specifications
Algorithm: Buhlmann ZH-L16
Sample tissues: 9
Tissue half-lives: from 5 to 640 minutes
Size and weight
Diameter: 2.5 in (62 mm)
Height: 1.0 in (25 mm)
Weight: 4 ounces (115 g)
Display face
Backlight illumination
Low battery indicator
Three user buttons
Water immersion switch
Depth sensor
Sea or fresh water calibration
Measuring range: 0 to 328 feet (0 to 100 m) measured every second
Accuracy: +/- 3% + 2 feet (0.5 m)
Surface interval time: from 0 to 48 hrs
Diving time: 0-599 minutes Dive mode, 0-1199 minutes Gage mode
Ascent rate warning: 26 to 52 feet per minute (8 to 16 m)
Thermometer
Operating range: 23 °F to 104 °F (-5 to 40 °C)
Accuracy: +/- 4 °F (2 °C)
Measurement interval: Every minute
Clock
Accuracy: +/- 30 sec on average per month
24-hour display
Compass
Measuring range: 0° to 360°
Altitude
Altitude function monitoring: from 0 to 19,685 feet (6,000 m)
measured every 10 minutes
Accuracy: +/- 800 feet (250 meters)
Battery
Li/MnO2 CR 2032 3V button battery
Average battery life: About 3 years (50 dives/year)
Replacement: User replaceable or return to manufacturer
Breathing gas
Mixes: 3 gas settings
O2 setting range: Mix1 – Mix3: 21 to 99 percent
O2 setting: 1% increments
Dive log
Dive logging: Maximum of 60 dives
Profile logging: Maximum of 30 hours
Profile sampling rates: 10 or 30 seconds
NiTek Trio Dive Computer User Manual v1.2
5
Introduction
Warnings
This information has been developed for your safety. Please read and
understand this manual completely before using your NiTek Trio dive
computer.
Important safety information:
•
Before using your NiTek Trio, it is extremely important that you
read the following points—as well as similar warning and caution
notices that appear throughout this manual. Failure to do so could
result in damage to or loss of equipment, serious personal injury,
or death.
•
The NiTek Trio is designed for use by certified divers who have
maintained a sufficient level of knowledge and skill proficiency
through a combination of formal training, ongoing study, and
experience. It is not intended for use by persons who lack these
qualifications and thus, may not be able to identify, assess, and
manage the risks scuba diving entails. Use of the NiTek Trio in
conjunction with Enriched Air Nitrox (EANx) requires that divers
be trained and certified for Nitrox diving.
•
The NiTek Trio is not intended for use by commercial or military
divers whose activities may take them beyond the commonly
accepted depth limits for recreational or technical diving.
•
Although the NiTek Trio is capable of calculating decompression
stop requirements, users must remember that dives requiring
mandatory stage decompression carry substantially greater risk
than dives made well within no-decompression limits.
•
The NiTek Trio is designed for use by one diver at a time. Divers
should not share a single NiTek Trio—or any other dive
computer—on the same dive. Additionally, no diver should lend
their NiTek Trio to anyone else until it calculates that no
measurable residual nitrogen remains after previous dives and no
longer displays the “desaturation time” indicator while in time
mode. Further, no diver should use their NiTek Trio for repetitive
dives—unless that same properly functioning NiTek Trio has
accompanied them on all previous dives in the same repetitive dive
series and is thus, accurately monitoring the diver’s total exposure
to oxygen and nitrogen.
•
Neither the NiTek Trio—nor any other dive computer—physically
measures the amount of nitrogen present in body tissues or the rate
at which nitrogen is being absorbed or released. The NiTek Trio
monitors depth and time, and uses this data to work a mathematical
6
NiTek Trio Dive Computer User Manual v1.2
Introduction
formula designed to emulate how individuals in good general
health and whose physical characteristics do not place them among
those at higher risk of decompression illness (DCI) are assumed to
absorb and release nitrogen from body tissues. Thus, the NiTek
Trio cannot compensate for factors such as age, obesity,
dehydration, cold, or exertion, which experts believe place divers
at greater risk of DCI. If these, or similar factors apply to you, use
the NiTek Trio—and other dive computers or dive tables—with
even greater caution.
•
Little is known regarding the exact nature and causes of
decompression illness (also known as decompression sickness,
DCI, or DCS). Susceptibility to DCI may vary substantially from
person to person and from day to day. Neither the NiTek Trio—nor
any other dive table or computer—can guarantee that you will not
suffer decompression illness. Even though you use these items
correctly, you may still suffer DCI. Use your NiTek Trio
conservatively and in conjunction with other dive planning
devices, such as dive tables. Do not rely on the NiTek Trio, or any
similar device, as your sole means of avoiding decompression
illness.
When diving…
•
Do not “push” the no-decompression limits (NDLs). Make safety
stops before ascending. If you exceed the no-decompression limits,
check your breathing gas supply at all stop depths.
•
The NiTek Trio does not monitor breathing gas supply. You must
monitor this yourself, on every dive, using a submersible pressure
gauge or equivalent device.
•
Do not rely solely on this or any other dive computer. Take a backup dive computer or dive tables (along with a separate means of
monitoring depth and dive time).
•
Be aware that the NiTek Trio makes assumptions regarding
residual nitrogen based on altitude settings. Avoid making abrupt
changes in altitude following a dive, as doing so may be very
dangerous.
NiTek Trio Dive Computer User Manual v1.2
7
Chapter 2
Using the NiTek Trio
Summary
This chapter provides topics about using, setting, and understanding
each of the modes and options of the NiTek Trio.
Content
Getting started • 10
Accessing display modes and screens • 11
Button operation • 11
Time Display mode • 12
Setting the time and date • 12
Entering time display mode from another
mode • 13
Activating the back light • 13
Changing the Character-Display • 13
Compass Set and Display mode • 14
Calibrating the Compass • 14
Saving a Compass Heading • 15
Dive Option Set and Display mode • 16
Using Computer Mode • 16
Setting Mixture Percentages • 17
Setting the Maximum Depth alarm • 18
Setting the Dive Time alarm • 19
Setting the Deepstop option • 19
Setting for Fresh or Salt Water use • 20
Setting the Dive Profile Sampling rate • 20
Setting the Safety Factor • 21
Setting Metric or Imperial operation • 22
Understanding FO2 default • 22
Using Gauge Mode • 24
Plan mode • 25
Dive computer mode • 27
Primary underwater screen • 27
Secondary underwater screens • 28
Changing gas mixes underwater • 29
Safety stop indication • 29
Using the compass • 30
Warnings while in diving mode • 31
Gauge mode • 36
Log mode • 37
Profile mode • 39
History mode • 41
PC transfer mode • 42
Surface mode (Upon Surfacing From a Dive) • 43
Altitude operation • 45
NiTek Trio Dive Computer User Manual v1.2
9
Using the NiTek Trio
Getting Started
The NiTek Trio has many modes and screens and a number of
options that can be changed depending on your dive location and
profile. The following is a checklist of general things that you
should pay attention to before, during, and after a dive.
Before a dive
•
Check that the proper time and date are set. If you have
traveled, your NiTek Trio may still be set to your home time
zone.
•
Check that the proper mixes are set for mix1, mix2 and
mix3. If you are using gauge mode, make sure it is set to
“gage.”
•
Make sure that you review the dive plan mode for maximum
depths and times for the mixes you are using
During a dive
•
Monitor the NiTek Trio throughout your dive for depth and
time
•
Monitor the N2 and O2 loading bar graphs
•
Pay attention to any alarms, such as an ascent rate warning
•
Follow the no-decompression limits or complete the required
decompression displayed and perform the necessary safety
stop
After a dive
•
Monitor surface interval time if making another dive
•
Follow the no-fly requirements
•
Review your dive using the log mode and profile mode
•
Download the dive log to your PC if you have the optional
PC interface
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NiTek Trio Dive Computer User Manual v1.2
Using the NiTek Trio
Accessing display modes and screens
There are some display modes that the NiTek Trio enters and/or exits
automatically. For example, by taking the NiTek Trio underwater, the
dive mode automatically turns on. Upon surfacing, the NiTek Trio
automatically enters the time mode.
Accessing other modes or screens requires the use of the NiTek Trio’s
buttons.
Button operation
The NiTek Trio has three buttons (select, mode, and set), which are
used to access the different modes and screens. To use the buttons,
simply press the button once or hold the button down depending on
what you are trying to do. The correct procedure to use is clearly
defined in each topic throughout the manual.
• Select button (A-key): This button is used to select the option field
that you want to change
• Mode button (B-key): This button is used to select and scroll
through the different modes, such as time mode
• Set button (C-key): This button is used to set an option’s setting,
such as setting the date
SET
SELECT
MODE
The front of the NiTek Trio, showing the three buttons that are
used to access and setup the different modes and screens
NiTek Trio Dive Computer User Manual v1.2
11
Using the NiTek Trio
Time Display mode
Time display mode is the NiTek Trio’s default mode. The computer
returns to this mode automatically upon surfacing from a dive and from
other modes when a period of time has passed without any buttons
being pressed.
1
4
2
3
In time display mode, “TEMP” and current temperature (1) is displayed
at the top of the screen, and the seconds (2), date (3) and time (4) are
displayed. Time can also be displayed in 24-hour (military) time. The
NiTek Trio may display additional information concerning exposure to
nitrogen and oxygen, desaturation time, surface interval time, and
altitude. These items are covered in “Surface mode” and “Altitude
operation.”
Setting the time and date
Setting the time and date are done in the time set mode. You can enter
or change the year, month, day, hours, minutes, and seconds in this
mode.
To set the time and date:
1.
2.
3.
4.
12
Repeatedly press Mode until “TIMESET” is displayed at the top of
the screen.
The “seconds” field flashes.
Press Set to “00” the seconds, or press Select to go to another field,
such as minutes.
Using Select and Set, set the year, month, day, hour, minutes,
seconds, and whether you want the time displayed in 24-hour
format.
For example, 1:00 PM would be 13:00 in military time.
Press Mode.
The computer returns to the time display mode.
NiTek Trio Dive Computer User Manual v1.2
Using the NiTek Trio
Entering time display mode from another mode
When you are using other modes, it is very easy to return to the time
display mode.
To enter time display mode from another mode:
1. Press and hold Mode for two seconds.
—OR—
2. Repeatedly press Mode until “TEMP” and current temperature is
displayed.
Activating the back light
The NiTek Trio has a back light that illuminates the screen.
To activate the back light:
1.
2.
Press either the Select or Set button.
The back light illuminates for four to five seconds.
Press either button again to reactivate the back light.
Toggling the Character-Display screen
The NiTek Trio has a 2-line display screen that can show either current
temperature, time-to-fly information or a user-selectable readout.
To toggle the user-selectable character-display:
1.
2.
Enter the Time-Display mode.
Press the Select button to switch between current temperature,
time-to-fly or the user-selectable readout.
Note: The user-selectable display can be changed with the NiTek
Trio Docking Station and a PC running the NiTek Divelog
software while connected to the NiTek Trio. Refer to the NiTek
Docking Station User Manual and Divelog software for additional
information.
NiTek Trio Dive Computer User Manual v1.2
13
Using the NiTek Trio
Compass Set and Display mode
Compass Set and Display mode is where the NiTek Trio compass
settings are displayed and set up. There are two screens needed to view
and set up the compass.
1
2
Compass display
(1) Angular display, in cardinal points and degrees
(2) Current time
To enter compass mode:
1.
Repeatedly press Mode until the heading and time is displayed at
the top of the screen.
Calibrating the compass
Before using the compass in a new area or region, you will need to
calibrate it to account for any differing magnetic variations.
Compass display in Calibrate mode
To calibrate the compass:
1.
2.
14
Repeatedly press Mode until the heading display and time is
displayed at the top of the screen.
Press and hold Set for 4-5 seconds until “ROTATE SLOWLY” is
displayed at the top of the screen.
NiTek Trio Dive Computer User Manual v1.2
Using the NiTek Trio
3.
4.
Slowly rotate the compass in a circle until “ROTATE OK” is
displayed at the top of the screen.
Press and hold Set again for 4-5 seconds until the heading display
and time is shown once more.
Saving a compass heading
You can save a heading on the compass display to return to later, or to
remind you of a heading to follow.
1
3
2
Saved compass heading
(1) Angular display, in cardinal points and degrees
(2) Current time
(3) Saved heading
To save a heading in the compass:
1.
2.
3.
Repeatedly press Mode until the heading display and time is
shown.
Press and hold Select for 4-5 seconds until the heading display and
time is displayed at the top of the screen.
The saved heading will be displayed to the left of the time readout.
A small arrow indicating the saved heading will also be displayed
above the angular display, if the saved heading is within 45
degrees of the current heading.
Note: The reciprocal of your heading will also be indicated with a
symbol in the display.
To erase/remove the saved heading, press and hold Select again for
4-5 seconds until the heading display and time is shown once
more.
NiTek Trio Dive Computer User Manual v1.2
15
Using the NiTek Trio
Dive Option Set and Display mode
Dive Option Set and Display mode is where all “dive” option settings
are displayed and set up. There several screens needed to view and set
up all dive options.
Note: If you are using the NiTek Trio in “Gage” mode, refer to the
section entitled ‘Using Gauge Mode’ for further information and setting
procedures.
Using computer mode
Computer mode is when the NiTek Trio is operating in the normal
computer mode. “DIVESET” is displayed on the screen and all
computer mode functions operate normally. The NiTek Trio dive
option set and display mode is used to review and change option
settings that pertain to an upcoming dive. The operating depth limit
when in computer mode is 328 feet (100 meters).
1
Dive Option Set and Display fields, screen1
2
4
3
Dive Option Set and Display fields, screen 2
(1) Dive operation
(2) Mix1, mix2 and mix3 FO2 gas percentages
(3) PO2 setting: This is the PO2 setting for the mix number
selected. The PO2 can be set from 1.0 to 1.6.
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NiTek Trio Dive Computer User Manual v1.2
Using the NiTek Trio
(4) Maximum operating depth (MOD) for PO2 setting: This is the
safe operating depth (maximum) for the mix selected. This is
based on the limiting PO2 factor you have selected.
Additional options and settings that can be selected include:
• Dive safety factor
• Dive profile sampling rate
• Salt or fresh water use
• Maximum depth alarm
• Maximum time alarm
• Metric or Imperial units of measurement
These are described in the following paragraphs.
To enter Dive Option Set and Display:
1.
2.
3.
Repeatedly press Mode until “DIVESET” is displayed at the top of
the screen.
Using the topics that follow, set up your desired dive option
settings.
If you want to exit DIVESET mode, press and hold Mode for 1 to
2 seconds to return to time mode.
Setting Mix1, Mix2 and Mix3 percentages
You must set the breathing mix you plan on using on your dive. Mix1
is considered the first breathing gas you plan on using during a dive,
and Mix2 and Mix3 are considered the second and third breathing gases
you are using on a dive.
•
Mix1, Mix2 and Mix3 can be set for 21 to 99 percent oxygen
Note: If you only plan on using one mix on your dive, you only need
to set Mix1.
To set Mix1, Mix2 and Mix3 percentages:
1.
2.
3.
4.
5.
6.
7.
Repeatedly press Mode until “DIVESET” is displayed at the top of
the screen.
Press Select and either “dive” or “gage” is blinking on the screen
and along the bottom of the display.
Press Set to select “dive” mode, if not already in that mode.
“DIVE” will continue to flash.
Press Select once to select the mix1 PO2 field.
Press and release Set to increase the PO2.
The PO2 will increase from 1.0 to 1.6 and then repeat.
Press Select again to select the mix1 percentage field.
Press and release Set to increase the percentage.
NiTek Trio Dive Computer User Manual v1.2
17
Using the NiTek Trio
The percentage will increase from air to 99 before repeating (The
percentage will stop at 32 percent and again at 99 percent).
Press and hold Set to advance the percentages rapidly.
Note: Nitrox” is displayed if mix1 is set for a FO2 of greater
than 21 percent. If mix2 or mix3 is set for 21 percent (air),
nothing appears until that mix is selected. If mix1 is in “default,”
the Nitrox indicator flashes. For more information on “default,”
see “Understanding FO2 default.”
8. Press Select again to advance to mix2. This will lock in mix1.
9. Repeat steps 4 through 7 for mix2. This will lock in mix2.
10. Press Select again to advance to mix3.
11. Repeat steps 4 through 7 for mix3. This will lock in mix3.
12. When finished, press Select to advance to the next option (depth
alarm). To exit, press and hold Mode for 1 to 2 seconds to return
to time mode.
NOTE: Unless prior dives that day have been conducted on air
(FO2 of 21 percent), the NiTek Trio will reset the gas mixture on
following dives to an FO2 of 99 percent if the surface interval is 10
minutes or longer. Please be certain to reset your gas mixture
between dives.
Setting the maximum depth alarm
The NiTek Trio has a maximum depth alarm that is activated when the
diver reaches the maximum depth that is set. When the max depth is
reached, an audible alarm sounds and the display flashes for three
seconds.
The alarm can be turned on or off and can be set from 5 to 328 feet (1.5
to 100 meters).
To set the maximum depth alarm:
1.
2.
3.
4.
5.
18
Repeatedly press Mode until “DIVESET” is displayed on the
screen.
Repeatedly press Select until the screen changes and “DEPTH
ALARM” is displayed.
The max depth is flashing.
Press Set to set the depth that you want the alarm to sound.
Press Select.
The max depth alarm “ON/OFF” flashes.
Press Set to toggle the alarm on and off.
The max depth symbol will be shown when the alarm is set.
NiTek Trio Dive Computer User Manual v1.2
Using the NiTek Trio
6.
When finished, press Select to advance to the next option (dive
time alarm). To exit, press and hold Mode for 1 to 2 seconds to
return to time mode.
Setting the dive time alarm
The NiTek Trio has a dive time alarm that is activated when the diver
reaches the dive time that is set for the dive. When the dive time is
reached, an audible alarm sounds and the screen flashes for three
seconds. Dive time alarm can be used when you want to set a
maximum dive time for your dive. The alarm indicates when this time
has expired.
The alarm can be turned on or off and can be set from 1 to 599 minutes.
To set the dive time alarm:
1.
2.
3.
4.
5.
6.
Repeatedly press Mode until “DIVESET” is displayed on the
screen.
Repeatedly press Select until the screen changes and “DIVETIME
ALARM” is displayed.
The dive time is flashing.
Press Set to set the time when you want the alarm to sound.
Press Select.
The dive time alarm “ON/OFF” flashes.
Press Set to toggle the alarm on and off.
When finished, press Select to advance to the next option
(deepstop). To exit, press and hold Mode for 1 to 2 seconds to
return to time mode.
Setting the deepstop option
The NiTek Trio has the ability to include deep stops into its
decompression algorithm, and they are available for dive-depths deeper
than 65 ft (21m). Deep-stops are only available on dives that are
actually a decompression dive, as recreational dives do not give deepstop information. When activated, deep stops will recommend an
additional stop (similar to a safety-stop) at its deepest stop at the
highest safety-factor level. The deep stop is highly recommended as
additional opportunity to off-gas, but is not mandatory. If the diver
chooses not to observe a deep-stop, it will not add to the shallower
deco-stops.
To set the deep-stop:
1.
Repeatedly press Mode until “DIVESET” is displayed at the top of
the screen.
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2.
3.
6.
Repeatedly press Select until the screen changes and
“DEEPSTOP” is displayed and “ON” or “OFF” is flashing.
Press Set to turn deepstop on or off.
Deepstop “ON/OFF” flashes.
When finished, press Select to advance to the next option (fresh or
salt water). To exit, press and hold Mode for 1 to 2 seconds to
return to time mode.
Setting for fresh or salt water use
The NiTek Trio is capable of operating using fresh or salt water
calculations. This is based on:
• One atmosphere of saltwater is 33 feet (10 meters)
• One atmosphere of freshwater is 34 feet (10.3 meters)
Before going diving, set the computer to the type of water you are
diving in. This allows for the most accurate calculations with respect to
no-decompression limits, etc.
To set for fresh or salt water:
1.
2.
3.
4.
Repeatedly press Mode until “DIVESET” is displayed at the top of
the screen.
Repeatedly press Select until ‘WATER IS’ is shown and
“FRESH” or “SEA” is flashing.
Press Set to toggle between fresh and sea water.
When finished, press Select to advance to the next option (profile
time). To exit, press and hold Mode for 1 to 2 seconds to return to
time mode.
Setting the dive profile sampling rate
The NiTek Trio allows you to choose how frequently it samples and
stores depth data. The data it samples and stores is used in profile mode
or when the data is uploaded to a personal computer. There are two
sampling rates to choose from: 10-second and 30-second.
The 10-second sampling rate enables the computer to sample and store
depth data every 10 seconds during a dive. The 10-second sampling
rate provides a more detailed dive profile, but because it stores more
information, fewer dives can be stored.
The 30-second sampling rate enables the computer to sample and store
depth data every 30 seconds during a dive. The 30-second sampling
rate is the computer’s “default” setting. The 30-second rate provides a
less detailed dive profile, but it is capable of storing more information
for more dives.
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Note: When the computer’s memory storage is full, it overwrites the
oldest dive profile data stored with the new information.
To set the dive profile sampling rate:
1.
2.
3.
4.
Repeatedly press Mode until “DIVESET” is displayed and flashing
on the screen.
Repeatedly press Select until “Pt” and the sampling rate number is
flashing.
Press Set to toggle between 10- and 30-seconds.
When finished, press Select to advance to the next option (user
safety). To exit, press and hold Mode for 1 to 2 seconds to return
to time mode.
Setting the safety factor
The safety factor setting is used to add an additional safety margin to
the no-decompression limits and decompression stop times. There are
three possible settings, 0, 1, and 2. A higher setting results in shorter
no-decompression limits and longer decompression stop times.
Setting
Description
0
Calculations are based solely on its built-in algorithm
(Buhlmann ZH-L16)
Calculations are based on one altitude rank higher
than the dive was actually made
Calculations are based on two altitude ranks higher
than the dive was actually made
1
2
To set the safety factor:
1.
2.
3.
4.
Repeatedly press Mode until “DIVESET” is displayed at the top of
the screen.
Repeatedly press Select until “SF” and the safety factor field is
flashing.
Press Set to select the desired safety factor.
When finished, press Select to return to the diveset mode. To exit,
press and hold Mode for 1 to 2 seconds to return to time mode.
Setting the computer for metric or Imperial
operation
The NiTek Trio can calculate and give you values in Imperial units or
metric units. When in metric, depth values are expressed in meters and
temperatures are expressed in Celsius (°C). When in Imperial, depth
values are expressed in feet and temperatures are expressed in
Fahrenheit (°F).
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To set for metric or Imperial operation:
1. Repeatedly press Mode until “DIVESET” is displayed on the
2.
3.
screen.
Press and hold Select and Set simultaneously for 5 to 6 seconds.
The computer beeps and changes to either feet (ft) or meters (m).
When finished, press and hold Mode for 1 to 2 seconds to return to
time mode.
Understanding FO2 default
In your entry-level Enriched Air Nitrox training, you learned that
among the greatest risks Nitrox (EANx) use poses is CNS oxygen
toxicity. CNS oxygen toxicity can occur if Nitrox is breathed at depths
where the partial pressure of oxygen (PO2) exceeds safe limits.
The NiTek Trio is designed to help divers avoid such situations by
presenting information and warnings regarding current PO2 levels and
cumulative exposure to elevated PO2s. To do so, the NiTek Trio must
be set to an FO2 that accurately matches the concentration of oxygen in
the gas mixture being breathed.
Similarly, the NiTek Trio is designed to help avoid decompression
illness by providing no-decompression limits (NDLs) or mandatory
decompression stop information. Again, to do so, the NiTek Trio must
be set in a manner that accurately matches the concentration of nitrogen
being breathed.
When this information is not available, the NiTek Trio attempts to
protect divers by basing its oxygen- and nitrogen-exposure calculations
on a “worst case” assumption. This is, that calculations are based on a
mixture containing up to 79 percent nitrogen and 99 percent oxygen.
This ‘worst case’ calculation is what is referred to as the FO2 default
setting.
Default warning indicated by ‘Nitrox’ and upper display blinking,
with an audible alarm
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When and how FO2 default occurs
One factor in determining if and when your NiTek Trio’s FO2 setting is
in default is whether you set one or more mixes for air or Nitrox.
• If you set any mix for air (FO2 of 21 percent), the computer
assumes that subsequent dives will be made using air. This means
that the mix set for air remains set for air, dive after dive, without
defaulting.
• However, if you set any mix for Nitrox or oxygen (FO2 of 22 to 99
percent), you will need to reset and verify the mix again for any
subsequent dive. This is to help protect you from accidentally
diving a Nitrox mixture that cannot accurately be monitored, as the
computer’s FO2 setting defaults to an FO2 of 99 percent (99% O2)
10 minutes after a dive (it does not default if you are under water).
Therefore, you must change the mix-setting if you plan subsequent
dives.
Dealing with FO2 default
The best way to deal with FO2 default is to simply avoid it. Make sure
that prior to every dive you check the FO2 settings for all mixes. Make
sure they accurately match what you are going to breathe during the
dive.
When the computer is in FO2 default mode, the Nitrox symbol and the
upper display flashes. This indicates that you need to set the
percentages for all mixes to the correct FO2.
If you go diving when the computer is in FO2 default mode, the OLI and
PO2 symbols, current depth, and PO2 value flash, and an audible alarm
sounds. The computer’s ability to accurately monitor your exposure to
oxygen no longer exists.
Note: You should not rely on the NiTek Trio as the sole means of
tracking your exposure to elevated partial pressures of oxygen (PO2s).
It is recommended that you use either a second Nitrox-capable
computer or another tracking method, such as Nitrox tables.
Using gauge mode
If you do not want to use the NiTek Trio as a normal ‘dive computer,’
the NiTek Trio has a gauge operation. Gauge operation is when the
NiTek Trio is operating simply as a depth gauge and bottom timer.
“GAGE” is displayed is displayed at the top of the screen and exposure
to nitrogen and oxygen and no-decompression limits are not tracked
and no bar graphs are displayed. This mode is used by divers who are
relying solely on dive tables for decompression information. The
operating depth limit when in gauge operation is 328 feet (100 meters).
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Note: If you are using the NiTek Trio in “Dive Computer” mode, refer
to the section entitled “Using Computer Mode” for further information
and setting procedures.
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!
!
Note: You cannot select gauge operation if the computer calculates
that there is still residual nitrogen remaining from a previous dive or if
the surface interval is less than 10 minutes. Also, you cannot return to
dive computer operation until 48 hours have passed since your last
dive.
In gauge mode, you can still set the profile sampling rate, salt or fresh
water use, max depth and dive time alarms. For more information, see
“Dive Option Set and Display mode.”
To select and setup gauge operation:
1.
2.
3.
Repeatedly press Mode until “DIVESET” is displayed.
Press Select and either “DIVE” or “GAGE” is flashing.
Press Set to select “gage” mode.
“GAGE” is displayed in place of “DIVE.”
4.
Press Select to continue with setup of other settings.
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Plan mode
Plan mode enables you to determine how long you can stay at
various depths while remaining within the no-decompression
limits. The no-decompression time limits are based on the
percentage that is set for mix1. If you are making a dive within
24 hours of a previous dive, the no-decompression time limits
are based on the residual nitrogen remaining.
The two most important values that are displayed on the screen
in plan mode are the depth and no-decompression time limit.
1
2
(1) Depth: When you first enter plan mode, the initial depth
displayed is 30 feet (9 meters). You can advance the depth in 10
foot (3 meter) increments. Fourteen different dive plan depth
increments can be displayed to a maximum depth of 160 feet (48
meters).
(2) No-decompression limit (NDL): Depending on the depth
displayed and the current FO2 setting, the available nodecompression limit, up to a maximum of 200 minutes, is
displayed. If the computer is in FO2 default, a series of
horizontal lines appears.
If the NiTek Trio calculates that there is residual nitrogen present
from previous dives, the available no-decompression limits are
shorter. Depending on how much residual nitrogen is present, no
NDL time may be displayed for some deeper depths. If this takes
place, a series of horizontal lines are displayed instead of the
time. Similarly, for combinations of depth and FO2 that would
cause a diver to exceed a limiting PO2 of 1.6 atmospheres, a
series of horizontal lines appears in place of the nodecompression limit.
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To enter Plan mode:
1. Repeatedly press Mode until “PLAN” is displayed on the
screen.
Note: Plan mode is not available if the Trio computer has
been set to “gage” mode.
2. Press Set to advance the depth or press Select to decrease the
depth.
The no-decompression time limits change automatically
based on the depth.
3. If you want to exit plan mode, press and hold Mode for 1 to
2 seconds to return to time mode.
WARNING: Do not plan dives to depths deeper than those for
which the NiTek Trio is capable of displaying an available nodecompression limit. Doing so could cause you to exceed the nodecompression limits or a limiting PO2 of 1.4 atmospheres (1.6
atmospheres for deco). This may increase your risk of
decompression illness or CNS oxygen toxicity and can lead to
serious personal injury or death.
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Dive Computer mode
Dive computer mode is automatically entered when the computer enters
the water. It begins performing its dive calculations once you descend
below 4 feet (1.2 meters).
Caution: Prior to diving, always check to ensure that the FO2 settings
are correct and that the computer is not in FO2 default.
While in diving mode, the computer calculates and displays
information about your dive and prompts you with safety stop
information and warnings if needed.
While underwater, there are two screens you can toggle between and
you can switch from mix1 to mix2 or mix 3 when needed. You can also
activate the back light feature.
Primary underwater screen
When you enter the water, the primary screen shows your depth,
remaining no-decompression limit, dive time, PO2 for selected mix, N2
and O2 bar graphs, and the ascent rate indicator.
7
4
1
2
6
5
3
(1) Ascent rate indicator: This is a representation of how fast you are
ascending. When you are ascending at a safe rate, it will display
“SAFE”. If you are ascending too fast, it will flash the word “SLOW”
and an audible alarm will sound to indicate you have exceeded the
maximum safe ascent rate.
(2) PO2: This is the partial pressure of O2 at your current depth. It is
based on the FO2 settings for the mixes.
(3) O2 (OLI) bar graph: This is the oxygen limit index (OLI) that
calculates the cumulative effect of your exposure to elevated partial
pressures of oxygen (PO2s). There are a maximum of eight bars. When
all bars are displayed, it means that you have used 100 percent of your
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“CNS” clock. This graph increases when you descend due to higher
partial pressures and may decrease when you ascend.
(4) Remaining no-decompression limit (NDL): This is the time that is
remaining (in minutes) before you reach the no-decompression limit.
This NDL time limit increases when you ascend and decreases when
you descend.
(5) Dive time: This is the time spent (in minutes) underwater, measured
from the time you descended below 4 feet (1.2 meters).
(6) Residual nitrogen (N2) bar graph: This is how much nitrogen the
computer assumes your body has absorbed. There are a maximum of
nine bars. When all bars are displayed, it means that you are at or have
exceeded the no-decompression limits.
(7) Depth: This is the current depth.
Secondary underwater screens
While underwater you can change to the secondary diving mode
screens that display additional information. When you switch screens,
temperature, maximum depth, and mixes are displayed.
1
4
2
3
(1) Maximum depth: This is the maximum depth that has been
reached during the dive. Note: a maximum depth is not shown in this
example, indicating the diver is descending.
(2) Temperature: This is the lowest temperature that has been reached
during the dive.
(3) Mix: The percentage that you set is displayed.
(4) Safety Factor: The safety factor margin that you selected.
To display the secondary diving mode screens:
1.
2.
Press Select button.
The back light turns on, and the first secondary screen is displayed.
Press Mode button.
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3.
The back light turns on, and the second secondary screen is
displayed.
Repeat to return to the primary diving mode screen.
To store or insert a bookmark into the dive graph profile:
1.
Press and hold the Set button for 1-2 seconds.
The dive information will be stored for later review.
Changing gas mixes underwater
Because the NiTek Trio has the ability to use up to three different gas
mixes (programmed in dive option set mode) during a dive, you need
the ability to switch between the mixes while underwater.
Note: You can only switch gas mixes if the PO2 for the gas mix you
are switching to is 1.6 atmospheres or less. Also, if mix2 or mix3 is not
programmed, you can not switch mixes.
To change gases underwater:
1.
2.
3.
4.
Press and hold MODE for 2-3 seconds.
The back light turns on and if you are using mix1, mix2 will blink
and the mix is displayed. If you are using mix2, mix3 will blink
and the mix is displayed, and so on.
Press and release SELECT to cycle between mixes.
Press and hold MODE for 1-2 seconds to select the mix to be used.
Press and release MODE again to return to the primary diving
mode screen.
Safety Stop indication
The NiTek Trio has an automatic three-minute safety stop feature built
in. On any dive, when you descend below 33 feet (10 meters) and then
ascend above 20 feet (6 meters), “STOP” is displayed and blinks and
the upper display includes a three-minute countdown.
During this time, if you ascend above 10 feet (3 meters), the countdown
pauses. It resumes when you descend below 10 feet (3 meters). If you
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descend below 20 feet (6 meters) during this time, “STOP” and the
three-minute countdown disappear; and the NDL readings reappear.
When you again ascend above 20 feet (6 meters), the three-minute
countdown restarts.
Using the Compass
The NiTek Trio has several screens that can display current heading,
depth, dive-time, and several alarm functions.
To display the compass screens:
1.
2.
3.
Press and hold the SET button for 1-2 seconds.
The back light turns on and the first compass screen is displayed,
showing heading and dive-time as well as PGT, OLI and alarms.
Pressing and releasing MODE will toggle the display between
current depth, dive-time, etc.
Press and hold the SET button for 1-2 seconds again to return to
the primary diving mode screen.
To save a heading in the compass:
1.
3.
Press and hold SELECT for several seconds until the heading
display and time is displayed at the top of the screen.
The saved heading will be displayed to the left of the time readout.
A small arrow indicating the saved heading will also be displayed
above the angular display, if the saved heading is within 45
degrees of the current heading.
Note: The reciprocal of your heading will also be indicated with a
symbol in the display.
To erase/remove the saved heading, press and hold SELECT again
for several seconds until the heading display and time is shown
once more.
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Warnings while in diving mode
While in diving mode, there are several warnings that you should be
alert to.
Default warning
If any mix is in default at the beginning of a dive, an audible alarm
sounds for three seconds. If you ascend and set the mix percentages,
you can restart the dive. The upper display also blinks “WATER SET
FO2!”, which is the best indication that the computer is defaulted
before entering the water.
Default warning indicated by Nitrox and “WATER SET FO2!”
blinking, and dashed line for mix
Ascent rate warning
The NiTek Trio assumes that you keep your ascent rate within the
following limits:
Depth range
Ascent rate
0 to 19 feet (0 to 5.9 meters)
26 feet (8 meters) per minute
20 to 59 feet (6 to 17.9 meters)
39 feet (12 meters) per minute
59 feet (18 meters) or deeper
52 feet (16 meters) per minute
If you exceed these ascent rates, “SLOW” and the current depth flash
for six seconds and an audible alarm sounds for three seconds. The
warning displays until you slow your ascent to an acceptable rate or
you reach 5 feet (1.5 meters). If the ascent rate is violated twice, the
“slow” symbol appears in log mode after the dive.
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Ascent rate warning with “SLOW” and depth blinking
PO2 limit warning
The PO2 warning indicates that you have exceeded the set PO2 and/or
1.6 atmospheres for the gas you are breathing. If you exceed the set
PO2, an audible alarm sounds, and the PO2 symbol and PO2 value
blink. “PO2 CAUT” (caution) also displays. If you exceed a PO2 of 1.6
atmospheres, in addition to the above audible alarm, “PO2 ALARM”
and the OLI bar graph will blink.
Note: If the PO2 alarms activate at a depth of 20 feet (6 meters) or
less, you probably have not exceeded the limiting PO2. What is likely
is that you forgot to set the FO2 percentages prior to the dive. As a
result, the computer has entered the FO2 default. See “Understanding
FO2 default” for more information.
View 1 - PO2 limit warning with “PO2” and PO2 value blinking.
View 2 - Exceeded PO2 with OLI graph blinking.
Oxygen limit index (OLI) warning
The NiTek Trio’s oxygen limit index (OLI) reflects the cumulative
effect of your exposure to elevated partial pressures of oxygen. The
PO2 warning only accounts for the intensity of the exposure, but the
OLI accounts for both the intensity and length.
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When seven of the O2’s eight bars are displayed, the computer’s
audible alarm sounds for three seconds, and “OLI CAUT” (caution)
blinks on the upper display. If you do not ascend to a shallower depth,
and all eight of the O2’s bars are displayed, the alarm will sound again
and “OLI ALARM” blinks again. “OLI ALARM” continues to flash
until the O2 bar graph drops to seven bars. This warning will appear in
log mode after the dive.
If the OLI and PO2 warnings activate at roughly the same time—and at
relatively shallows depths, early in the dive—you probably have not
exceeded your actual oxygen limits. What is likely is that you forgot to
set the FO2 percentages prior to the dive and the computer has FO2
defaulted. See “Understanding FO2 default” for more information.
View 1 - OLI warning, “OLI CAUT” and “OLI ALARM” blinking.
View 2 - OLI graph also blinking.
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Decompression warning
If you exceed the no-decompression limits, the computer enters
decompression mode. An audible alarm sounds for twice for three
seconds and “DECO STOP” blinks, indicating that you have
decompression stop requirements.
Caution: Decompression diving is considered to substantially increase
your risk of decompression illness more than dives made within nodecompression limits.
1&2
6
3
4
5
Decompression warning with “DECO STOP” and stop-depth
information displayed
(1) Stop symbol: The “DECO STOP” symbols indicate that you need
to stop at the depth displayed.
(2) Deco symbol: The “DECO” symbol displays when you have
decompression requirements.
(3) Required stop time: This is the time you must remain at the
indicated stop depth.
(4) Total ascent time: This is the total amount of time (in minutes) you
must spend at the decompression stops and the ascent time between
decompression stops.
(5) Nitrogen (N2) bar graph: This is how much nitrogen the computer
assumes your body has absorbed. There are a maximum of nine bars.
When all bars are displayed, it means that you are at or have exceeded
the no-decompression limits and have entered decompression.
(6) Required stop depth: This is the required decompression stop
depth.
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Decompression stop violation warning
A decompression stop violation warning takes place when you ascend
to a shallower depth than the indicated stop depth or if you do not
spend sufficient time at the required depth before ascending. When you
enter this violation, the computer’s audible alarm sounds twice for three
seconds each, and the current depth, stop depth, stop time, and “DECO
AL STOP!” blink. These items continue blinking as long as you remain
shallower than the indicated stop depth.
Note: During a deco stop violation, the computer’s ascent rate warning
does not function.
Caution: If you do not correct an indicated deco stop violation, the
warnings continue for several minutes after surfacing. At this point, the
computer is not usable for the next 48 hours.
Decompression stop violation with “DECO AL STOP!” and
current depth, stop depth, and stop time blinking
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Gauge mode
Gauge mode is automatically entered when the computer enters the
water. It begins displaying depth and time once you descend below 4
feet (1.2 meters).
Gauge operation is when the NiTek Trio is operating simply as a depth
gauge and bottom timer. “Gage” and the dive-profile are displayed on
the screen, exposure to nitrogen and oxygen and no-decompression
limits are not tracked, and no bar graphs are displayed. This mode is
used by divers who are relying solely on dive tables for decompression
information. The operating depth limit when in gauge operation is 328
feet (100 meters).
Note: To enter and set up gauge mode, see “Using gauge mode.”
Note: If a dive has been made in gauge mode, the “Dive” mode can
not be chosen for 48 hours. You cannot select Gauge mode if the
computer determines there is still residual nitrogen from a previous
dive while in Dive mode, or if the surface interval has been less than 10
minutes.
While in gauge mode underwater, there are two screens you can toggle
between. The primary screen displays depth and time. The secondary
screen displays maximum depth and temperature.
4
1
3
2
Gage mode, primary and secondary screens
(1) Current depth: This is the current depth of the dive.
(2) Total dive time: This is the total time for the dive.
(3) Temperature: This is the lowest temperature reached on the dive.
(4) Max depth: This is the maximum depth reached during the dive.
Note: a maximum depth is not shown in this example, indicating the
diver is still descending.
To toggle between screens underwater:
1.
2.
Press and hold Set for 4-5 seconds.
The back light turns on, and the computer switches to the
secondary screen.
Release Set to return to the primary screen.
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Log mode
For each dive, the NiTek Trio stores information, such as depth, time,
temperature, etc. in a log. This stored log information can be viewed
directly from the NiTek Trio’s screen when in log mode, and is not userresettable
Because of the amount of information the NiTek Trio stores, there are
three pages that you can toggle between for each dive. Each dive is
assigned a number, beginning with one, for the day. Each log page
displays the log number and the page number, making it easy for you to
toggle between the dive log pages.
5
1
4
2
3
Page one for a dive in Log mode
9
8
10
11
6
7
Page two for a dive in Log mode
15
12
13
16
14
Page three for a dive in Log mode
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(1) Dive log number: This is the dive log number. Each dive has three
pages of logged information.
(2) Date: This is the month and day of the dive.
(3) Dive number for day: This is the dive number for the day.
(4) Descent time: Time the dive started, indicated by a down arrow.
(5) Altitude Rank: The altitude ranking at which the dive was made.
(6) Dive page number: This is the page number for the dive. Each dive
has three pages of logged information.
(7) O2 OLI bar graph: The CNS toxicity level at the end of the dive.
(8) FO2 gas percentages: These are the FO2 gas percentages that you
entered for the dive. All calculations were based on these percentages.
(9) Ascent time: Time the dive ended, indicated by an up arrow.
(10) Nitrogen (N2) exposure bar graph: This is the amount of
residual nitrogen in your body at the end of the dive.
(11) Dive time: This is the actual in water time for the dive.
(12) Maximum depth: The maximum depth reached during the dive.
(13) Temperature: Tthe coldest temperature reached during the dive.
(14) Average depth: This is the average depth reached during the dive.
(15) Depth graph: This is a graphical view of the entire dive.
Note: In this example, the altitude rank was “0”, while “DECO”,
“PO2” and “SLOW” indicators are visible, indicating those
conditions had been reached and are recorded in the log.
(16) “Dive” or “Gage”: The dive was conducted in “Dive” or “Gage”
mode. Note: When in “Gage” mode, the FO2 (8), and O2 OLI (7) and
Nitrogen (10) exposure bar graphs will not be displayed. This indicates
the NiTek Trio is not recording that data.
To view a dive log:
1.
2.
3.
4.
Repeatedly press Mode until the logbook function graph is
displayed at the top of the screen.
“WAIT” may be displayed momentarily, and then the logged dive
information will be displayed.
Press Select to scroll “up” through the logged dives. To fast-scroll,
press and hold Select.
Press Set to scroll “down” through the logged dives. To fast-scroll,
press and hold Set.
Once a dive log is selected, you can use Set and Select to toggle
between pages of the dive log.
Note: Refer to items (1), (3), and (6) above to help you navigate
between screens.
To exit log mode, press and hold Mode for 1 to 2 seconds to return
to time mode.
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Profile mode
Profile mode enables you to see a record of the depths you reached at
various points during a dive. You can display a detailed profile of each
dive stored in the log. When a dive is selected, the computer
automatically displays the depth and the time in the dive when you
reached that depth until it reaches the end of the dive.
Dive profile information is either stored in 10- or 30-second intervals
during a dive. This must be set in dive mode before a dive. Refer to
“Setting the dive profile sampling rate” for more information.
The dive number and date of the dive are displayed when you scroll
through the dives. This makes it easy to find the dive profile you want
to view.
5
1
3
2
4
Dive Profile mode
(1) Dive log entry number: This is the dive number that corresponds
to the dive number when in log mode.
(2) Dive time: This tells you at what time during the dive you reached
the depth indicated.
(3) Number of dives per day: This corresponds to the number of
dives per day.
(4) Depth: This is the depth that corresponds to the displayed dive
time. Depending on what profile sampling rate you have set, either two
depth readings (30-second rate) or six depth readings (10-second rate)
are displayed for each minute during a dive.
(5) Depth graph: This is a graphical view of the entire dive, with the
moving point of the dive at that time.
To view a dive profile:
1.
40
Repeatedly press Mode until the logbook function graph is
displayed at the top of the screen.
NiTek Trio Dive Computer User Manual v1.2
Using the NiTek Trio
2.
3.
3.
4.
Using Select and Set, scroll through the dives until you reach the
dive you wish to review.
Press Mode again to enter the Profile mode.
“WAIT” may be displayed momentarily, and then the logged dive
information and graph will be displayed.
Once a dive profile is selected, the computer automatically
progresses through the different depths and times of the dive.
If you want to exit profile mode, press and hold Mode for 1 to 2
seconds to return to time mode.
NiTek Trio Dive Computer User Manual v1.2
41
Using the NiTek Trio
History mode
The total dive time, total number of dives and maximum depth reached
are displayed when in History mode, and are not user-resettable. The
NiTek Trio will separately track dives in both “Dive” and “Gage”
functions, so you can have a complete record of your diving
experiences.
1
2
4
3
History mode, Dive and Gage
(1) Total number of dives: This corresponds to the number of dives
recorded on the NiTek Trio in the particular mode.
(2) Total dive time: This is the total dive time logged on the NiTek
Trio in the particular mode.
(3) Maximum Depth: This is the maximum depth reached on the
NiTek Trio in the particular mode.
(4) “Dive” or “Gage”: Dive modes.
To view the History :
1.
2.
3.
4.
42
Repeatedly press Mode until “DIVESET” is displayed at the top of
the screen.
Using the Select and Set buttons, select either “DIVE” or “GAGE”
mode for history viewing.
Repeatedly press Mode until “HISTORY” is displayed at the top of
the screen.
Your total dive information is displayed.
To view history information for the other mode (ie, DIVE vs
GAGE), repeat steps 1 through 3 above, selecting the
corresponding mode.
NiTek Trio Dive Computer User Manual v1.2
Using the NiTek Trio
PC Transfer mode
You can transfer the stored dive log information to your personal
computer using the optional NiTek Trio Docking Station and its
associated NiTek DiveLog software.
Please note that the NiTek Trio Dive Log software does not currently
work on Vista 64 bit operating systems. Seiko is working with
Microsoft to get certification as well as modify the drivers and installer.
We apologize for this inconvenience.
To enter PC Transfer mode:
1.
2.
3.
4.
Follow the Docking Station instructions to load the NiTek
DiveLog software to your PC, and to connect the Docking Station
to your NiTek Trio dive computer.
On your NiTek Trio, repeatedly press Mode until “SET CRADLE”
is displayed at the top of the screen.
“LINKED” will be displayed in the screen when the dive computer
and PC are connected.
Transfer the dive log data to your PC.
To exit PC Transfer mode, press and hold Mode for 1 to 2 seconds
to return to time mode.
NiTek Trio Dive Computer User Manual v1.2
43
Using the NiTek Trio
Surface mode (Upon Surfacing From a
Dive)
Once you surface from a dive, the NiTek Trio automatically switches to
time mode, with other information displayed on the screen that pertains
to the dive you just completed. This includes:
• Current temperature
• Desaturation time *
• Surface interval time
• No-fly symbol
• Nitrogen (N2) bar graph *
• Oxygen limit index (OLI) bar graph *
* not shown in “Gage” mode
This additional information is displayed on the screen until the NiTek
Trio calculates that it is no longer needed or after 24 hours have passed
since the last dive.
Note: If you are making repetitive dives, you need to pay attention to
your surface interval and use it in conjunction with plan mode. This
ensures that you stay within no-decompression limits.
Note: Unless prior dives that day have been conducted on air (FO2 of
21 percent), the NiTek Trio will reset the gas mixture on following
dives to an FO2 of 99 percent if the surface interval is 10 minutes or
longer. Please be certain to reset your gas mixture between dives.
5
1
4
3
2
NiTek Trio showing (1) surface interval time, (2) O2 and (3) N2
bar graphs (4) desaturation time, and (5) no-fly symbol.
Surface mode :
(1) Surface interval time: This is the amount of time you have spent
on the surface since your last dive if there is residual nitrogen present
from a previous dive. It can display up to 24 hours of surface interval
time.
44
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Using the NiTek Trio
(2) O2 OLI bar graph: This indicates CNS toxicity level at the end of
the dive. This drops as your surface interval time increases.
(3) Nitrogen (N2) exposure bar graph: This is the amount of residual
nitrogen in your body at the end of the dive. This drops as your surface
interval time increases.
(4) Desaturation time: This is the amount of time, expressed in hours
and minutes, that must pass before the residual nitrogen levels drop to a
point where subsequent dives are treated as a single (non-repetitive)
dives. This is not the same as “time to fly (see no-fly symbol below).”
(5) No-fly symbol: This symbol, when displayed, indicates that you
should not fly or go to any altitude higher than the one you are diving
in until it disappears from the screen.
When the computer finishes calculating your desaturation time and
your surface interval time is over 12 hours, the no-fly symbol turns off.
If the computer finishes calculating your desaturation time and your
surface interval time is not over 12 hours, then the no-fly symbol stays
on until 12 hours of surface time have passed.
Note: If the dive was made in “Gage” mode, the “Gage” icon will be
displayed and the OLI and N2 bar graphs will not be displayed.
Note: After a dive in “Gage” mode, you will be responsible for
calculating your own desaturation and surface-interval times.
WARNING: It is recommended that you wait at least 24-hours
following any dive before flying in an aircraft or driving to altitude.
Failure to allow sufficient surface interval time before doing so may
increase your risk of decompression illness (DCI).
NiTek Trio Dive Computer User Manual v1.2
45
Using the NiTek Trio
Altitude operation
The NiTek Trio adjusts automatically for diving at altitudes of up to
19,685 feet (6,000 meters). To show that the NiTek Trio has made the
altitude adjustment, it displays the altitude settings using symbols
representing mountains.
*
Altitude rank symbols
Symbol
Altitude range
No symbol
Sea Level to 3,281 feet (1000 meters)
2,297 to 5,906 feet (700 to 1,800 meters)
4,593 to 8,530 feet (1,400 to 2,600 meters)
7,546 to 19,685 feet (2,300 to 6,000 meters)
E
Out of range above 19,685 feet (6,000 meters)
Prior to using the NiTek Trio at altitudes substantially above sea level,
you should find out what the actual altitude of your dive site is. Make
certain that the altitude settings the NiTek Trio displays accurately
match the altitude you are at.
Notes
• Do not use the NiTek Trio unless the altitude settings accurately
match the actual height above sea level you are diving in. Doing so
could cause the NiTek Trio to display inaccurate information.
• Do not use the NiTek Trio when the “E” symbol is displayed. This
means that you are above an altitude of 19,685 feet (6,000 meters),
which is beyond the NiTek Trio’s ability to function accurately.
• Do not place the NiTek Trio in dive mode when making sudden,
substantial changes in altitude, such as when flying in an airplane.
This can be caused by storing the NiTek Trio with wet dive gear,
which can touch its external electrical contacts and cause it to enter
46
NiTek Trio Dive Computer User Manual v1.2
Using the NiTek Trio
dive mode. This can interfere with the computer’s ability to
function accurately.
The NiTek Trio monitors and displays altitude information in all
modes, except PC Transfer mode. Upon arriving at altitude, the NiTek
Trio’s residual nitrogen bar graph may show that there is excess
nitrogen present, even though you may not have made any dives in the
preceding 24 hours.
If you have obtained the altitude specialty diver training, which
everyone should do before diving at altitudes substantially above sea
level, you already understand that this should be expected. By
ascending to a higher altitude from a lower one, your body has more
nitrogen saturated in body tissues than would be present had you spent
the preceding 24 hours at the higher altitude. By displaying residual
nitrogen and a surface interval, your NiTek Trio is merely reflecting
this fact.
If the level of residual nitrogen calculated by the NiTek Trio is
unusually high (seven or eight bars) when going to altitude, the
computer will be unable to enter dive mode. Avoid taking the computer
to altitude when residual nitrogen levels are this high, and do not enter
the water until nitrogen levels have dropped substantially.
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47
Chapter 3
Care and Maintenance
Summary
This chapter provides care and maintenance and battery
information for the NiTek Trio.
Content
Proper handling techniques • 48
Low battery warning • 49
Replacing the battery • 49
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48
Care and Maintenance
Proper handling techniques
The NiTek Trio is constructed to withstand the most demanding diving
conditions. It is, however, a high precision instrument, which requires
proper care.
Caution: Failure to follow these handling techniques may result in
damage to the NiTek Trio.
•
•
•
•
•
•
•
•
•
•
•
Do not store the computer in hot and/or humid environments. The
pressure transducer is sensitive to both heat and humidity. If
impaired, it may cause incorrect altitude or depth readings.
When in hot and/or humid environments, dip the computer in
water for several minutes to cool it to room temperature before
using it. If it is cold, allow the computer to warm to room
temperature. Do not take it underwater immediately after doing so.
Do not transport your NiTek Trio on an aircraft or take it to
altitude while it is sealed in an air-tight container. Doing so may
interfere with its ability to correctly read, display, and track depth
information.
The NiTek Trio’s Liquid Crystal Display (LCD) may darken if left
in a hot environment (such as on a car’s dashboard). It will return
to normal once allowed to cool, however, extensive exposure to
heat may shorten LCD life.
Be aware that weather-related changes in air-pressure can cause
incorrect display of altitude settings. Be sure to check indicated
altitude settings against actual altitude before use. Your NiTek Trio
is not to be disassembled by anyone other than Dive Rite or its
authorized dealers. Unauthorized disassembly will violate the
warranty.
If the NiTek Trio does not appear to be functioning properly, do
not use it to dive. Return it to your authorized Dive Rite dealer for
repair.
The NiTek Trio should not come in contact with solvents or any
type of chemical substances
Do not use compressed air to dry the NiTek Trio
Do not use the NiTek Trio in hyperbaric chambers if the device is
not fully submerged in water
Always rinse the computer with freshwater after use
Store the NiTek Trio in a cool, dry location. After diving, wipe the
computer dry and store it in a location separate from other damp
items.
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49
Care and Maintenance
Low battery warning
The battery that comes with the NiTek Trio is designed to last for up to
three years under normal use. You may get more or less use from the
battery depending on how often it is used and how it is cared for.
Cautions
• All NiTek Trio functions may cease within two to three days of the
low battery symbol first appearing. Always have low batteries
replaced promptly.
• A depleted battery that is left in a NiTek Trio for a long period of
time may leak. Replace batteries promptly.
• Never replace the battery when desaturation is under way, since all
data for desaturation calculation would be lost.
Replacing the battery
Battery replacement is an easy operation that can be done by the user.
The battery must be replaced whenever the low battery symbol (fixed
or blinking) is displayed.
Note: When you replace the battery, all data regarding desaturation,
time, and date, etc. is lost. The dive-log does not reset.
To replace the battery:
1.
2.
3.
4.
Unscrew the clear back cover using a coin in the direction
indicated by the arrows.
Examine the battery and battery housing for signs of corrosion.
Wipe off any sand or dirt from the cover and o-ring.
Remove the battery.
Replace the battery; making sure that the polarity is correct.
For correct battery size, refer to “Specifications.”
NOTE: When finished changing the battery, prior to replacing the
cover, remember to depress the reset button next to the battery door
using a ball point pen. Hold down for 2 to 3 seconds until display comes up.
5.
6.
7.
50
Place a thin layer of silicone grease on the cover o-ring.
Screw the battery cover back into place. Do not over tighten.
Reset the time and date.
NiTek Trio Dive Computer User Manual v1.2
Index
A
accessing
modes and screens · 11
activating
back light · 13
alarms · 3
gauge mode · 24
maximum depth · 17
maximum depth alarm ·
18
maximum time · 17
algorithm · 5
altitude · 3, 5
altitude operation · 45
altitude symbols · 45
ascent rate · 27
ascent rate warning · 31
ascent time · 34
log mode · 38
B
back light · 4
activating · 13
battery · 5
low battery warning · 49
replacing · 49
Bookmark · 29
Buhlmann · 5
button operation · 11
C
Care and Maintenance · 47
proper handling
techniques · 48
character display
toggling · 13
clock · 5
compass · 3, 5
Compass
calibrating · 14
setting heading · 15
compass set and display
mode · 14
Compass, using underwater
· 30
computer mode
options · 16
using · 16
Computer mode · 27
current depth · 28
gauge mode · 36
D
date and time · 3
deco symbol · 34
decompression · 4
decompression stop
violation warning · 34
decompression warning · 33
deepstop
description · 19
setting · 19
default mode
time mode · 12
default warning · 31
depth · 3
depth sensor · 5
desaturation time · 44
descent time
NiTek Trio Dive Computer User Manual v1.2
51
Index
log mode · 38
dive log · 4, 5
dive option set and display
mode · 16
dive profile · 4
dive time · 28
gauge mode · 36
log mode · 38
diving
after a dive · 10
before a dive · 10
during a dive · 10
diving mode · 27
gauge mode · 36
primary screen · 27
secondary screens · 28
H
History mode · 41
viewing · 41
I
Imperial · 4, 17
L
log · 4
log mode · 37
viewing · 38
M
F
features and functions · 3
flying
no-fly symbol · 44
FO2 default · 22
dealing with · 23
how it occurs · 23
FO2 percentages
log mode · 38
fresh or salt water use
setting · 20
fresh water · 17
G
gas mixes
changing underwater · 29
gas mixtures · 3
gauge mode · 23, 36
changing screens
underwater · 36
selecting · 23
52
maximum depth · 28
gauge mode · 36
log mode · 38
maximum depth alarm · 17
description · 18
gauge mode · 24
setting · 18
maximum time alarm
description · 19
gauge mode · 24
setting · 19
measurement
Imperial · 17
metric · 17
metric · 4, 17
metric or Imperial
description · 21
setting · 21
mix1, mix2 and mix3 · 16
changing underwater · 29
mix1, mix2, mix3 · 5, 17, 27
mode button · 11
NiTek Trio Dive Computer User Manual v1.2
Index
N
R
NDL · 25, 28
nitrogen
log mode · 38
no-decompression limit ·
25, 28
no-fly symbol · 44
residual nitrogen · 25, 28,
34, 44
O
OLI · 28, 44
log mode · 38
options
compass calibrating · 14
compass heading · 15
computer mode · 16
oxygen limit index · 28, 44
oxygen limit index warning
· 32
P
PC transfer mode · 4, 42
entering · 42
percentages
mix1, mix2, mix3 · 17
plan mode · 25
PO2 · 16
PO2 limit warning · 32
profile · 4
profile mode · 39
viewing · 39
profile sampling rate · 17
description · 20
gauge mode · 24
setting · 20
S
safety factor · 17
description · 21
setting · 21
safety information · 6
safety stop · 29
salt or fresh water use
gauge mode · 24
salt water · 17
select button · 11
set button · 11
setpoints · 16
setting
compass · 14
deepstop · 19
dive options · 16
fresh or salt water use ·
20
maximum depth alarm ·
18
maximum time alarm · 19
metric or Imperial · 21
profile sampling rate · 20
safety factor · 21
time and date · 12
size and weight · 5
Sleep · 3
specificatons · 5
stop depth · 34
stop symbol · 34
stop time · 34
surface interval time · 43
surface mode · 43
Surface mode
NiTek Trio Dive Computer User Manual v1.2
53
Index
viewing · 43
W
T
temperature · 3, 28
gauge mode · 36
log mode · 38
thermometer · 5
time
dive time alarm · 19
time and date · 12
time and date
setting · 12
time mode · 12
entering from another
mode · 13
setting time and date · 12
toggling
character display · 13
54
warnings · 6
ascent rate · 31
decompression stop
violation warning · 34
decompression warning ·
33
default warning · 31
diving mode · 31
low battery warning · 49
oxygen limit · 32
PO2 limit warning · 32
water
fresh or salt · 4
salt or fresh water use ·
20
NiTek Trio Dive Computer User Manual v1.2