DESCENT Owner’s Manual T1

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DESCENT T1 Owner’s Manual

2020 Garmin Ltd. or its subsidiariesAll rights reserved. Under the copyright laws, this manual may not be copied, in whole or in part, without the written consent of Garmin. Garmin reserves the right to change or improve itsproducts 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 updatesand 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 aretrademarks 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 respectiveowners.

Table of ContentsIntroduction.1Installation and Setup. 1Transmitter Position Tips . 1Installing the Transmitter on Your Tank Regulator . 1Installing the Transmitter on a High Pressure HoseExtension . 2Pairing the Transmitter with a Compatible Descent DiveComputer . 2Transmitter Settings . 3Selecting Paired Transmitters to View on Your Dive DataScreens . 3Selecting the Gas Consumption Rate Metric . 3Including Transmitters in Gas Consumption Calculations . 3Adding the Transmitters Data Screen to a Dive Mode . 3Diving. 3Dive Warnings . 4Starting a Dive on a Paired Descent Dive Computer . 4Viewing the Transmitter Data Screens . 4Transmitter Alerts . 4Enabling Lost Transmitter Alerts . 5Device Information. 5Replacing the Descent T1 Battery . 5Device Care . 5Cleaning the Transmitter . 5Specifications . 5Getting More Information . 5Troubleshooting. 6Updating the Transmitter Software Using Your Descent DiveComputer . 6My transmitter and watch lose connection underwater . 6Adjusting the Transmitter Power Setting . 6My transmitter battery is draining rapidly . 6Index. 7Table of Contentsi

IntroductionWARNINGSee the Important Safety and Product Information guide in theproduct box for product warnings and other importantinformation.Installation and SetupCAUTIONTo ensure proper setup and best performance, it is stronglyrecommended that you complete the first time installation andsetup at a dive shop. You should fully test the transmitterinstallation above and below water before using it during a dive.Transmitter Position TipsThe transmitter communicates wirelessly with your compatibledive computer. On the surface, it uses ANT technology.Underwater, it uses a sonar signal. Your body, drysuit, and diveequipment can obstruct the signal, particularly while underwater.For the best reception, all transmitters in your group should haveclear lines of sight to the dive computer. To help preventblocking the signal with your body or equipment, you shouldfollow these tips. You should install the transmitter at least 7 cm (3 in.) fromyour body. You should install the transmitter on the same side of thetank as the wrist wearing your dive computer. For example, ifyou wear your dive computer on your left wrist, you shouldinstall the transmitter on the left side of the tank regulator. For the best reception, you should wear the tank high on yourback. This allows the transmitter to have a clear line of sightover your shoulders. If you wear your tank inverted with the regulator at thebottom, you can use a high-pressure hose to relocate thetransmitter to have a clear line of sight over your shoulders. If you lose the signal from your transmitter, you should moveyour arm until the signal is restored. If you lose the signal from another diver, you should changeyour body position until the signal is restored. If your body isbetween the dive computer and another diver, it may obstructthe signal from that diver's transmitter.IntroductionInstalling the Transmitter on Your TankRegulatorWARNINGAlways use the pre-installed flow restrictor when using thetransmitter directly attached to your regulator. Always use theincluded air spool when connecting the transmitter to a highpressure hose extension (Installing the Transmitter on a HighPressure Hose Extension, page 2). Using the transmitterwithout either the flow restrictor or air spool could result inserious injury or death from an air pressurization failure.Before you install the transmitter on your tank regulator, youshould read the transmitter position tips and choose the portposition that provides the best line of sight to the dive computer.To install the transmitter, you need a 5/8 in. (16 mm) open-endedwrench.The transmitter connects to a high pressure output port of thefirst-stage regulator.1 Confirm the regulator is depressurized and detached from ascuba cylinder.2 Remove the port plug from the high pressure output port ofthe first-stage regulator.3 Confirm the flow restrictor is installed in the transmitter.4 Screw the transmitter onto the high pressure output port untilyou feel resistance.WARNINGVerify the installed transmitter does not physically interferewith any hoses or other tank assemblies.5 Use a 5/8 in. (16 mm) wrench to tighten the transmitter.1

3 Confirm the regulator is depressurized and detached from ascuba cylinder.4 Remove the port plug from the high pressure output port ofthe first-stage regulator.5 Connect a high pressure hose extension to the high pressureoutput port of the first-stage regulator.6 Screw the transmitter onto the high pressure hose extensionuntil you feel resistance.NOTICETo prevent damage to the transmitter and possible loss offunction, do not overtighten. Do not use the transmitterhousing to tighten or loosen the transmitter.Do not grip the regulator or the transmitter to move, carry, oradjust the tank.Installing the Transmitter on a High PressureHose ExtensionWARNINGAlways use the pre-installed flow restrictor when using thetransmitter directly attached to your regulator (Installing theTransmitter on Your Tank Regulator, page 1). Always use theincluded air spool when connecting the transmitter to a highpressure hose extension. Using the transmitter without either theflow restrictor or air spool could result in serious injury or deathfrom an air pressurization failure.Before you install the transmitter on a high pressure hoseextension certified to the EN 250:2014 standard, you shouldread the transmitter position tips and choose a position thatprovides the best line of sight to the dive computer.To install the transmitter, you need two 5/8 in. (16 mm) openended wrenches and a small flat screwdriver or flat-nose pliers.The transmitter can connect to a high pressure hose extensionfrom the high pressure output port of the first-stage regulator.1 Use a screwdriver or pliers to carefully remove the flowrestrictorfrom the transmitter.WARNINGVerify the installed transmitter does not physically interferewith any hoses or other tank assemblies.7 Use two 5/8 in. (16 mm) wrenches to tighten the transmitter,placing one wrench on the transmitter and one wrench on thehose fitting.NOTICETo prevent damage to the transmitter and possible loss offunction, do not overtighten. Do not use the transmitterhousing to tighten or loosen the transmitter.Do not grip the regulator or the transmitter to move, carry, oradjust the tank.8 Ensure the connection between the transmitter and hoseNOTICEUse care when removing the flow restrictor to avoiddamaging the device.2 Insert the large end of the air spool2into the transmitter.fitting is secure before using the device.You must remove the air spool and reinstall the flow restrictorbefore installing the transmitter on your tank regulator.Pairing the Transmitter with a CompatibleDescent Dive ComputerTo pair the transmitter, you must have a pressurized tank andregulator.The Descent T1 can transmit air pressure data to a compatibleDescent dive computer. For more information about compatibledive computer models, go to the Descent T1 product page ongarmin.com.Before you use the transmitter for the first time, you must pair itwith the dive computer. Out of the box, the transmitter is in lowInstallation and Setup

power mode. You must wake the device from low power modeto complete the pairing process.NOTE: If a transmitter was packaged with your dive computer,they are already paired.1 Install the transmitter on the first-stage regulator (Installingthe Transmitter on Your Tank Regulator, page 1).2 Gradually open the tank valve to pressurize the first-stageregulator.When the transmitter detects pressure, it wakes from lowpower mode. The transmitter plays a tone when it wakesfrom low power mode and is ready to pair.3 On the compatible Descent dive computer, hold MENU, andselect Dive Setup Air Integration Transmitters AddNew.The dive computer starts searching and displays a list ofnearby transmitters.4 From the list of transmitters, select the transmitter ID youwant to pair.The transmitter ID is printed on the housing.When the pairing process is complete, Connected appears onthe dive computer screen. The transmitter begins sending tankpressure data, and it is ready to use on a dive. The next time thetransmitter and dive computer are turned on and within wirelessrange, they connect automatically when you start a dive.If you are diving with a group, you can pair up to 5 Descent T1transmitters with the dive computer.Transmitter SettingsYou can customize the settings for paired transmitters prior to adive.On the paired Descent dive computer, hold MENU, select DiveSetup Air Integration Transmitters, and select atransmitter.Status: Enables a connection to the transmitter, and showscurrent connection status.Identify: Plays a tone on the selected paired transmitter. Thishelps you to identify the transmitter without needing to look atthe transmitter ID printed on the transmitter housing.Units: Sets the pressure units for your tank. The device defaultsto psi if your depth setting is in feet, and bar if your depthsetting is in meters.Working Pressure: Sets how much pressure the tank has whenfull. This value is used to determine the upper end of thepressure gauge, and to calculate respiratory minute volume(RMV) for tanks using psi units.Reserve Pressure: Sets the threshold values for reservepressure and critical pressure alerts to appear on the divecomputer.Volume: Allows you to enter the air volume of the tank. You canuse the Reset Volume option if you move the transmitter to adifferent size tank.NOTE: This value is required to calculate volumetric surfaceair consumption (SAC) and respiratory minute volume (RMV)(Selecting the Gas Consumption Rate Metric, page 3).SAC/RMV/ATR: Enables the transmitter to be included involumetric surface air consumption (SAC), respiratory minutevolume (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 ifyour transmitter is losing connection with the paired divecomputer underwater.About: Displays the transmitter ID, software version, and batterystatus.DivingName: Allows you to enter an easily identifiable name for thetransmitter.Remove: Allows you to remove a paired transmitter.Dive TerminologyAir time remaining (ATR): The time you may remain at thecurrent depth until an ascent at 9 m/min. (30 ft./min.) wouldresult in surfacing with the reserve pressure.Pressure-based surface air consumption (PSAC): Thechange in pressure over time, normalized to 1 ATM.Respiratory minute volume (RMV): The change in gas volumeat ambient pressure over time.Volumetric surface air consumption (SAC): The change ingas volume over time, normalized to 1 ATM.Selecting Paired Transmitters to View on Your DiveData ScreensYou can view two paired transmitters at-a-glance on the primarydive data screen. You can customize which paired transmittersappear on the screen. By default, the first and secondtransmitters that you pair appear.1 On the paired Descent dive computer, hold MENU.2 Select Dive Setup Air Integration Display Setup.3 Select a field to customize.4 Select a paired transmitter.Selecting the Gas Consumption Rate Metric1 On the paired Descent dive computer, hold MENU.2 Select Dive Setup Air Integration Display Setup GasConsumption Rate.3 Select an option.NOTE: The dive computer can estimate volumetric surfaceair consumption (SAC) or respiratory minute volume (RMV)only if the air volume of the tank is entered in the divecomputer (Transmitter Settings, page 3). The dive computercan estimate pressure-based surface air consumption(PSAC) with or without the air volume of the tank.Including Transmitters in Gas ConsumptionCalculationsGas consumption and air time remaining estimates arecalculated using the tank pressure from the includedtransmitters. By default, the first transmitter that you pair withyour compatible dive computer is included. You can includeadditional paired transmitters in gas consumption calculations.1 On the paired Descent dive computer, hold MENU.2 Select Dive Setup Air Integration Transmitters.3 Select a paired transmitter.4 Select the SAC/RMV/ATR toggle switch to include thetransmitter in gas consumption calculations.If5 necessary, repeat steps 2 through 4 to include additionalpaired transmitters in gas consumption calculations.Adding the Transmitters Data Screen to a Dive ModeYou can add the transmitters data screen to the data screenloop for a dive mode.1 On the paired Descent dive computer, hold MENU.2 Select Activities & Apps.3 Select a dive mode, and select the dive mode settings.4 Select Data Screens Add New Transmitters.DivingYou can use a compatible Descent dive computer paired withyour Descent T1 transmitter to start a diving activity. See theDescent Series Owner's Manual for more information.3

Dive WarningsWARNING This device is for use by certified divers only. This device should not be used as the only source ofpressure information. Always use backup instruments,including a depth gauge, submersible pressure gauge, andtimer or watch. Make sure that you fully understand the use, displays, andlimitations of your device. If you have questions about thismanual or the device, always resolve any discrepancies orconfusion before diving with the device. Always rememberthat you are responsible for your own safety. The dive computer can calculate your surface airconsumption rate (SAC) and air time remaining (ATR). Thesecalculations are an estimate and should not be relied on asthe only source of information. Perform pre-dive safety checks, such as checking properdevice 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 thedive computer, terminate the dive immediately and safelyreturn to the surface. Disregarding the alarm may result inserious injury or death. For safety reasons, you should never dive alone. Dive with adesignated buddy. You should also stay with others for anextended time after a dive, because the potential onset ofdecompression sickness (DCS) may be delayed or triggeredby surface activities. This device is not intended for commercial or professionaldive activities. It is for recreational purposes only.Commercial or professional dive activities can expose theuser to extreme depths or conditions that increase the risk ofDCS. The transmitter is not an oxygen cleaned product. Do not usethe transmitter with anything greater than 40% oxygen.When you return to the surface, the device automatically endsand saves the dive after one minute has elapsed (by default).You must depressurize your regulator to return the transmitter tolow power mode.Viewing the Transmitter Data Screens1 During a dive, press DOWN on your paired Descent divecomputer to view the transmitter data screen.The gas consumption estimate for the selected transmitters.NOTE: You can customize the transmitters used for gascalculations (Including Transmitters in Gas ConsumptionCalculations, page 3).The air time remaining (ATR) estimate for the selectedtransmitters.Your primary and secondary transmitters and their tankpressure values.NOTE: You can customize which transmitters are displayed(Selecting Paired Transmitters to View on Your Dive DataScreens, page 3).2 From the transmitter data screen, press START to viewadditional paired transmitters in the network.Starting a Dive on a Paired Descent DiveComputer1 On the paired Descent dive computer, press START from thewatch face.2 Select a dive mode.See the owner's manual for your Descent dive computer formore information about supported dive modes.3 Press START until the primary dive data screen appears.The primary dive data screen displays up to two pairedtransmitters(Selecting Paired Transmitters to View onYour Dive Data Screens, page 3).NOTE: You can use this screen to confirm your pairedtransmitters are connected to your dive computer prior tostarting your dive.Transmitter AlertsAlertMessageCauseDevice ActionNoneYour paired dive computerhas lost communicationwith the transmitter for 30seconds.The tank pressure valueflashes yellow.%1 is belowreservepressure.Your tank pressure is belowthe reserve pressure level."%1" is replaced with thetransmitter name.The tank pressure valueturns yellow.The paired dive computervibrates and plays awarning tone.%1 pressure Your tank pressure is belowis criticallythe critical pressure level.low."%1" is replaced with thetransmitter name.The tank pressure valueflashes red.The paired dive computervibrates and plays awarning tone.4 Descend to start your dive.The activity timer starts automatically when you reach adepth of 1.2 m (4 ft.).5 Press DOWN to scroll through the additional data screens.4Diving

AlertMessageCauseDevice Action%1 has alow battery.Fewer than 20 hours of divetime remain. "%1" isreplaced with thetransmitter name.The transmitter nameflashes BATT. LOW whenthe battery is critically low.The paired dive computervibrates and plays awarning tone.NO COMMS Your paired dive computerhas lost communicationwith the transmitter for 60seconds.The transmitter nameflashes NO COMMS,dashed lines replace thetank pressure value, andthe tank pressure valueflashes red.The paired dive computervibrates and plays awarning tone if connectionalerts are enabled.Enabling Lost Transmitter AlertsYour paired dive computer can lose communication with thetransmitter when the transmitter is out of range, when thetransmitter signal is blocked

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 \376\377garmin .com

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