Garmin DESCENT T1 Manuel utilisateur

DESCENT™T1

Owner’s Manual

products and to make changes in the content of this manual without obligation to notify any person or organization of such changes or improvements. Go to www.garmin.com for current updates

and supplemental information concerning the use of this product.

Garmin®, the Garmin logo, and ANT® are trademarks of Garmin Ltd. or its subsidiaries, registered in the USA and other countries. Descent™, Garmin Dive™, Garmin Express™, and Subwave™ are

trademarks of Garmin Ltd. or its subsidiaries. These trademarks may not be used without the express permission of Garmin. Other trademarks and trade names are those of their respective

owners.

Table of Contents

Introduction.....................................................................1

Installation and Setup.................................................... 1

Transmitter Position Tips............................................................ 1

Installing the Transmitter on Your Tank Regulator..................... 1

Installing the Transmitter on a High Pressure Hose

Extension.................................................................................... 2

Pairing the Transmitter with a Compatible Descent Dive

Computer.................................................................................... 2

Transmitter Settings............................................................... 3

Selecting Paired Transmitters to View on Your Dive Data

Screens.................................................................................. 3

Selecting the Gas Consumption Rate Metric......................... 3

Including Transmitters in Gas Consumption Calculations..... 3

Adding the Transmitters Data Screen to a Dive Mode.......... 3

Diving.............................................................................. 3

Dive Warnings............................................................................ 4

Starting a Dive on a Paired Descent Dive Computer................. 4

Viewing the Transmitter Data Screens....................................... 4

Transmitter Alerts....................................................................... 4

Enabling Lost Transmitter Alerts............................................ 5

Device Information......................................................... 5

Replacing the Descent T1 Battery.............................................. 5

Device Care................................................................................ 5

Cleaning the Transmitter........................................................5

Specifications..............................................................................5

Getting More Information............................................................ 5

Troubleshooting............................................................. 6

Updating the Transmitter Software Using Your Descent Dive

Computer.................................................................................... 6

My transmitter and watch lose connection underwater.............. 6

Adjusting the Transmitter Power Setting................................6

My transmitter battery is draining rapidly.................................... 6

Index................................................................................ 7

Table of Contents i

Introduction

WARNING

See the Important Safety and Product Information guide in the

product box for product warnings and other important

information.

Installation and Setup

CAUTION

To ensure proper setup and best performance, it is strongly

recommended that you complete the first time installation and

setup at a dive shop. You should fully test the transmitter

installation above and below water before using it during a dive.

Transmitter Position Tips

The transmitter communicates wirelessly with your compatible

dive computer. On the surface, it uses ANT® technology.

Underwater, it uses a sonar signal. Your body, drysuit, and dive

equipment can obstruct the signal, particularly while underwater.

For the best reception, all transmitters in your group should have

clear lines of sight to the dive computer. To help prevent

blocking the signal with your body or equipment, you should

follow these tips.

• You should install the transmitter at least 7 cm (3 in.) from

your body.

• You should install the transmitter on the same side of the

tank as the wrist wearing your dive computer. For example, if

you wear your dive computer on your left wrist, you should

install the transmitter on the left side of the tank regulator.

• For the best reception, you should wear the tank high on your

back. This allows the transmitter to have a clear line of sight

over your shoulders.

• If you wear your tank inverted with the regulator at the

bottom, you can use a high-pressure hose to relocate the

transmitter to have a clear line of sight over your shoulders.

• If you lose the signal from your transmitter, you should move

your arm until the signal is restored.

• If you lose the signal from another diver, you should change

your body position until the signal is restored. If your body is

between the dive computer and another diver, it may obstruct

the signal from that diver's transmitter.

Installing the Transmitter on Your Tank

Regulator

WARNING

Always use the pre-installed flow restrictor when using the

transmitter directly attached to your regulator. Always use the

included air spool when connecting the transmitter to a high

pressure hose extension (Installing the Transmitter on a High

Pressure Hose Extension, page 2). Using the transmitter

without either the flow restrictor or air spool could result in

serious injury or death from an air pressurization failure.

Before you install the transmitter on your tank regulator, you

should read the transmitter position tips and choose the port

position that provides the best line of sight to the dive computer.

To install the transmitter, you need a 5/8 in. (16 mm) open-ended

wrench.

The transmitter connects to a high pressure output port of the

first-stage regulator.

1Confirm the regulator is depressurized and detached from a

scuba cylinder.

2Remove the port plug from the high pressure output port of

the first-stage regulator.

3Confirm the flow restrictor is installed in the transmitter.

4Screw the transmitter onto the high pressure output port until

you feel resistance.

WARNING

Verify the installed transmitter does not physically interfere

with any hoses or other tank assemblies.

5Use a 5/8 in. (16 mm) wrench to tighten the transmitter.

Introduction 1

NOTICE

To prevent damage to the transmitter and possible loss of

function, do not overtighten. Do not use the transmitter

housing to tighten or loosen the transmitter.

Do not grip the regulator or the transmitter to move, carry, or

adjust the tank.

Installing the Transmitter on a High Pressure

Hose Extension

WARNING

Always use the pre-installed flow restrictor when using the

transmitter directly attached to your regulator (Installing the

Transmitter on Your Tank Regulator, page 1). Always use the

included air spool when connecting the transmitter to a high

pressure hose extension. Using the transmitter without either the

flow restrictor or air spool could result in serious injury or death

from an air pressurization failure.

Before you install the transmitter on a high pressure hose

extension certified to the EN 250:2014 standard, you should

read the transmitter position tips and choose a position that

provides the best line of sight to the dive computer.

To install the transmitter, you need two 5/8 in. (16 mm) open-

ended wrenches and a small flat screwdriver or flat-nose pliers.

The transmitter can connect to a high pressure hose extension

from the high pressure output port of the first-stage regulator.

1Use a screwdriver or pliers to carefully remove the flow

restrictor from the transmitter.

NOTICE

Use care when removing the flow restrictor to avoid

damaging the device.

2Insert the large end of the air spool into the transmitter.

3Confirm the regulator is depressurized and detached from a

scuba cylinder.

4Remove the port plug from the high pressure output port of

the first-stage regulator.

5Connect a high pressure hose extension to the high pressure

output port of the first-stage regulator.

6Screw the transmitter onto the high pressure hose extension

until you feel resistance.

WARNING

Verify the installed transmitter does not physically interfere

with any hoses or other tank assemblies.

7Use two 5/8 in. (16 mm) wrenches to tighten the transmitter,

placing one wrench on the transmitter and one wrench on the

hose fitting.

NOTICE

To prevent damage to the transmitter and possible loss of

function, do not overtighten. Do not use the transmitter

housing to tighten or loosen the transmitter.

Do not grip the regulator or the transmitter to move, carry, or

adjust the tank.

8Ensure the connection between the transmitter and hose

fitting is secure before using the device.

You must remove the air spool and reinstall the flow restrictor

before installing the transmitter on your tank regulator.

Pairing the Transmitter with a Compatible

Descent Dive Computer

To pair the transmitter, you must have a pressurized tank and

regulator.

The Descent T1 can transmit air pressure data to a compatible

Descent dive computer. For more information about compatible

dive computer models, go to the Descent T1 product page on

garmin.com.

Before you use the transmitter for the first time, you must pair it

with the dive computer. Out of the box, the transmitter is in low

2 Installation and Setup

power mode. You must wake the device from low power mode

to complete the pairing process.

NOTE: If a transmitter was packaged with your dive computer,

they are already paired.

1Install the transmitter on the first-stage regulator (Installing

the Transmitter on Your Tank Regulator, page 1).

2Gradually open the tank valve to pressurize the first-stage

regulator.

When the transmitter detects pressure, it wakes from low

power mode. The transmitter plays a tone when it wakes

from low power mode and is ready to pair.

3On the compatible Descent dive computer, hold MENU, and

select Dive Setup > Air Integration > Transmitters > Add

New.

The dive computer starts searching and displays a list of

nearby transmitters.

4From the list of transmitters, select the transmitter ID you

want to pair.

The transmitter ID is printed on the housing.

When the pairing process is complete, Connected appears on

the dive computer screen. The transmitter begins sending tank

pressure data, and it is ready to use on a dive. The next time the

transmitter and dive computer are turned on and within wireless

range, they connect automatically when you start a dive.

If you are diving with a group, you can pair up to 5 Descent T1

transmitters with the dive computer.

Transmitter Settings

You can customize the settings for paired transmitters prior to a

dive.

On the paired Descent dive computer, hold MENU, select Dive

Setup > Air Integration > Transmitters, and select a

transmitter.

Status: Enables a connection to the transmitter, and shows

current connection status.

Identify: Plays a tone on the selected paired transmitter. This

helps you to identify the transmitter without needing to look at

the transmitter ID printed on the transmitter housing.

Units: Sets the pressure units for your tank. The device defaults

to psi if your depth setting is in feet, and bar if your depth

setting is in meters.

Working Pressure: Sets how much pressure the tank has when

full. This value is used to determine the upper end of the

pressure gauge, and to calculate respiratory minute volume

(RMV) for tanks using psi units.

Reserve Pressure: Sets the threshold values for reserve

pressure and critical pressure alerts to appear on the dive

computer.

Volume: Allows you to enter the air volume of the tank. You can

use the Reset Volume option if you move the transmitter to a

different size tank.

NOTE: This value is required to calculate volumetric surface

air consumption (SAC) and respiratory minute volume (RMV)

(Selecting the Gas Consumption Rate Metric, page 3).

SAC/RMV/ATR: Enables the transmitter to be included in

volumetric surface air consumption (SAC), respiratory minute

volume (RMV), and air time remaining (ATR) estimates

(Including Transmitters in Gas Consumption Calculations,

page 3).

Set Transmit Power: Allows you to adjust the power setting if

your transmitter is losing connection with the paired dive

computer underwater.

About: Displays the transmitter ID, software version, and battery

status.

Name: Allows you to enter an easily identifiable name for the

transmitter.

Remove: Allows you to remove a paired transmitter.

Dive Terminology

Air time remaining (ATR): The time you may remain at the

current depth until an ascent at 9 m/min. (30 ft./min.) would

result in surfacing with the reserve pressure.

Pressure-based surface air consumption (PSAC): The

change in pressure over time, normalized to 1 ATM.

Respiratory minute volume (RMV): The change in gas volume

at ambient pressure over time.

Volumetric surface air consumption (SAC): The change in

gas volume over time, normalized to 1 ATM.

Selecting Paired Transmitters to View on Your Dive

Data Screens

You can view two paired transmitters at-a-glance on the primary

dive data screen. You can customize which paired transmitters

appear on the screen. By default, the first and second

transmitters that you pair appear.

1On the paired Descent dive computer, hold MENU.

2Select Dive Setup > Air Integration > Display Setup.

3Select a field to customize.

4Select a paired transmitter.

Selecting the Gas Consumption Rate Metric

1On the paired Descent dive computer, hold MENU.

2Select Dive Setup > Air Integration > Display Setup > Gas

Consumption Rate.

3Select an option.

NOTE: The dive computer can estimate volumetric surface

air consumption (SAC) or respiratory minute volume (RMV)

only if the air volume of the tank is entered in the dive

computer (Transmitter Settings, page 3). The dive computer

can estimate pressure-based surface air consumption

(PSAC) with or without the air volume of the tank.

Including Transmitters in Gas Consumption

Calculations

Gas consumption and air time remaining estimates are

calculated using the tank pressure from the included

transmitters. By default, the first transmitter that you pair with

your compatible dive computer is included. You can include

additional paired transmitters in gas consumption calculations.

1On the paired Descent dive computer, hold MENU.

2Select Dive Setup > Air Integration > Transmitters.

3Select a paired transmitter.

4Select the SAC/RMV/ATR toggle switch to include the

transmitter in gas consumption calculations.

5If necessary, repeat steps 2 through 4 to include additional

paired transmitters in gas consumption calculations.

Adding the Transmitters Data Screen to a Dive Mode

You can add the transmitters data screen to the data screen

loop for a dive mode.

1On the paired Descent dive computer, hold MENU.

2Select Activities & Apps.

3Select a dive mode, and select the dive mode settings.

4Select Data Screens > Add New > Transmitters.

Diving

You can use a compatible Descent dive computer paired with

your Descent T1 transmitter to start a diving activity. See the

Descent Series Owner's Manual for more information.

Diving 3

Dive Warnings

WARNING

• This device is for use by certified divers only.

• This device should not be used as the only source of

pressure information. Always use backup instruments,

including a depth gauge, submersible pressure gauge, and

timer or watch.

• Make sure that you fully understand the use, displays, and

limitations of your device. If you have questions about this

manual or the device, always resolve any discrepancies or

confusion before diving with the device. Always remember

that you are responsible for your own safety.

• The dive computer can calculate your surface air

consumption rate (SAC) and air time remaining (ATR). These

calculations are an estimate and should not be relied on as

the only source of information.

• Perform pre-dive safety checks, such as checking proper

device function and settings, display function, battery level,

tank pressure, and bubble checks to check hoses for leaks.

• If a tank pressure warning or battery warning appears on the

dive computer, terminate the dive immediately and safely

return to the surface. Disregarding the alarm may result in

serious injury or death.

• For safety reasons, you should never dive alone. Dive with a

designated buddy. You should also stay with others for an

extended time after a dive, because the potential onset of

decompression sickness (DCS) may be delayed or triggered

by surface activities.

• This device is not intended for commercial or professional

dive activities. It is for recreational purposes only.

Commercial or professional dive activities can expose the

user to extreme depths or conditions that increase the risk of

DCS.

• The transmitter is not an oxygen cleaned product. Do not use

the transmitter with anything greater than 40% oxygen.

Starting a Dive on a Paired Descent Dive

Computer

1On the paired Descent dive computer, press START from the

watch face.

2Select a dive mode.

See the owner's manual for your Descent dive computer for

more information about supported dive modes.

3Press START until the primary dive data screen appears.

The primary dive data screen displays up to two paired

transmitters (Selecting Paired Transmitters to View on

Your Dive Data Screens, page 3).

NOTE: You can use this screen to confirm your paired

transmitters are connected to your dive computer prior to

starting your dive.

4Descend to start your dive.

The activity timer starts automatically when you reach a

depth of 1.2 m (4 ft.).

5Press DOWN to scroll through the additional data screens.

When you return to the surface, the device automatically ends

and saves the dive after one minute has elapsed (by default).

You must depressurize your regulator to return the transmitter to

low power mode.

Viewing the Transmitter Data Screens

1During a dive, press DOWN on your paired Descent dive

computer to view the transmitter data screen.

The gas consumption estimate for the selected transmitters.

NOTE: You can customize the transmitters used for gas

calculations (Including Transmitters in Gas Consumption

Calculations, page 3).

The air time remaining (ATR) estimate for the selected

transmitters.

Your primary and secondary transmitters and their tank

pressure values.

NOTE: You can customize which transmitters are displayed

(Selecting Paired Transmitters to View on Your Dive Data

Screens, page 3).

2From the transmitter data screen, press START to view

additional paired transmitters in the network.

Transmitter Alerts

Alert

Message

Cause Device Action

None Your paired dive computer

has lost communication

with the transmitter for 30

seconds.

The tank pressure value

flashes yellow.

%1 is below

reserve

pressure.

Your tank pressure is below

the reserve pressure level.

"%1" is replaced with the

transmitter name.

The tank pressure value

turns yellow.

The paired dive computer

vibrates and plays a

warning tone.

%1 pressure

is critically

low.

Your tank pressure is below

the critical pressure level.

"%1" is replaced with the

transmitter name.

The tank pressure value

flashes red.

The paired dive computer

vibrates and plays a

warning tone.

4 Diving

Alert

Message

Cause Device Action

%1 has a

low battery.

Fewer than 20 hours of dive

time remain. "%1" is

replaced with the

transmitter name.

The transmitter name

flashes BATT. LOW when

the battery is critically low.

The paired dive computer

vibrates and plays a

warning tone.

NO COMMS Your paired dive computer

has lost communication

with the transmitter for 60

seconds.

The transmitter name

flashes NO COMMS,

dashed lines replace the

tank pressure value, and

the tank pressure value

flashes red.

The paired dive computer

vibrates and plays a

warning tone if connection

alerts are enabled.

Enabling Lost Transmitter Alerts

Your paired dive computer can lose communication with the

transmitter when the transmitter is out of range, when the

transmitter signal is blocked by your body or that of another

diver, and when the transmitter loses battery power. You can

enable an alert that notifies you when your paired dive computer

has lost communication with the transmitter for 60 seconds.

1On the paired dive computer, hold MENU.

2Select Dive Setup > Air Integration > Connection Alert.

Device Information

Replacing the Descent T1 Battery

NOTICE

You should purchase a replacement battery only from a high-

quality manufacturer and a reputable vendor. Using a low quality

battery could result in poor product performance and reduced

battery life, especially at low temperatures. Do not use

rechargeable batteries. Rechargeable batteries may have a

higher voltage specification and can cause permanent damage

to the device.

To replace the battery, you need a coin or flat screwdriver, a

new 3 V CR123A lithium battery, and waterproof silicone

grease. You may also need a replacement battery cap

accessory.

The transmitter is powered by a 3 V CR123A lithium battery. A

battery is pre-installed at the factory. You must carefully follow

the battery replacement instructions to preserve the transmitter's

waterproofing.

1Insert a coin or flat screwdriver into the slot , and rotate

counter-clockwise to unscrew the battery cap.

2Remove the battery cap and battery.

3Insert the new battery in the transmitter, with the positive pole

facing into the transmitter and the negative pole facing the

battery door.

4Inspect both gaskets to verify they are clean, undamaged,

and fully seated in the grooves.

If the gaskets appear worn or damaged, you can purchase a

replacement battery cap kit, including a cap, pre-installed

gaskets, and silicone grease. Go to the Descent T1 product

page on garmin.com to purchase accessories.

5Apply a thin layer of waterproof silicone grease to both

gaskets.

6Replace the battery cap into the transmitter, and fully tighten

it.

Device Care

NOTICE

Do not grip the regulator or the transmitter to move, carry, or

adjust the air tank.

Do not remove the safety plug from the base of the transmitter.

Do not use a sharp object to clean the device.

Avoid chemical cleaners, solvents, and insect repellents that can

damage plastic components and finishes.

Thoroughly rinse the device with fresh water after exposure to

chlorine, salt water, sunscreen, cosmetics, alcohol, or other

harsh chemicals. Prolonged exposure to these substances can

damage the case.

Avoid extreme shock and harsh treatment, because it can

degrade the life of the product.

Do not store the device where prolonged exposure to extreme

temperatures can occur, because it can cause permanent

damage.

Discontinue use if the device is damaged or if it is stored at a

temperature outside the specified storage temperature range.

Discontinue use if there is water ingress into the battery

compartment. Even small amounts of water can cause corrosion

of the electrical contacts.

Cleaning the Transmitter

1After each dive, rinse the transmitter with fresh water to

remove salt and debris.

2If necessary, clean the transmitter with a soft cloth.

Specifications

Battery 3 V CR123A lithium

Battery life Up to 100 hr.

Thread type 7/16 in. (20 UNF)

Normal operating temperature From -20 to 60°C (from -4 to

140°F)

Underwater operating temperature From 0 to 40°C (from 32 to 104°F)

Storage temperature From -30 to 70°C (from -22 to

158°F)

Wireless frequency 2.4 GHz @ 0 dBm

Surface transmission range (ANT

wireless technology)

Up to 10 m (33 ft.)

Underwater transmission range

(sonar)

Up to 10 m (33 ft.)

Water rating 11 ATM1

Pressure rating 300 bar (4351 psi)

Inspection interval Inspect parts before each use for

damage. Replace parts as

needed.2

Getting More Information

You can find more information about this product on the Garmin®

website.

• Go to support.garmin.com for additional manuals, articles,

and software updates.

• Go to buy.garmin.com, or contact your Garmin dealer for

information about optional accessories and replacement

parts.

1 The device withstands pressure equivalent to a depth of 110 m. For more

information, go to garmin.com/waterrating.

2 Aside from normal wear and tear, performance is not affected by aging.

Device Information 5

Troubleshooting

Updating the Transmitter Software Using

Your Descent Dive Computer

Before you can update the software, you must pair your Descent

T1 transmitter to a compatible Descent dive computer.

1Select an option to sync your dive computer:

• Sync your dive computer with the Garmin Dive™ app.

• Connect the dive computer to your computer using the

USB cable, and sync with the Garmin Express™

application.

Garmin Dive and Garmin Express automatically look for

software updates. When you sync with Garmin Express, the

update is applied immediately to your dive computer. When

you sync with Garmin Dive, you will be prompted to apply the

update at a later time.

2Install the transmitter on the first-stage regulator (Installing

the Transmitter on Your Tank Regulator, page 1).

3Gradually open the tank valve to pressurize the first-stage

regulator.

When the transmitter detects pressure, it wakes from low

power mode and plays a tone.

4On the paired Descent dive computer, hold MENU, select

Dive Setup > Air Integration > Transmitters, and select

your transmitter.

5Wait for the transmitter to connect to your dive computer.

Connected appears on the dive computer screen.

6Select Software Update.

NOTE: This option may take up to a minute to appear while

the dive computer determines the transmitter's software

version and battery status.

7Verify the transmitter ID when prompted.

The transmitter ID is printed on the housing.

8Keep the dive computer near the transmitter until the

software update is complete.

My transmitter and watch lose connection

underwater

If your watch and transmitter communicate on the surface but

lose communication underwater, you can try these tips.

• Increase the transmitter power setting (Adjusting the

Transmitter Power Setting, page 6).

• Install the transmitter on a high pressure hose extension to

improve the line of sight between the transmitter and the

watch (Installing the Transmitter on a High Pressure Hose

Extension, page 2).

• Follow the transmitter position tips to achieve the best line of

sight between the watch and the transmitter (Transmitter

Position Tips, page 1).

Adjusting the Transmitter Power Setting

NOTE: Increasing the power setting increases the audible noise

from the transmitter and decreases its battery life.

1Hold MENU.

2Select Dive Setup > Air Integration > Transmitters.

3Select a paired transmitter.

4Select Set Transmit Power.

5Enter the transmitter ID.

NOTE: The transmitter ID is printed on the housing.

6Select an option.

My transmitter battery is draining rapidly

If your transmitter battery is draining faster than the expected

battery life (Specifications, page 5), you should make sure the

transmitter is returning to low power mode after a dive.

When you return to the surface after a dive, depressurize

your regulator.

The installed transmitter enters low power mode after two

minutes have elapsed.

6 Troubleshooting

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