DESCENT T1 ™ Owner’s Manual
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Table of Contents My transmitter makes an audible noise while diving........................................... 15 Introduction..................................... 1 Index.............................................. 16 Installation and Setup...................... 1 Transmitter Position Tips....................... 2 Installing the Transmitter on Your Tank Regulator................................................. 3 Installing the Transmitter on a High Pressure Hose Extension.......................
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.
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 4). Using the transmitter without either the flow restrictor or air spool could result in serious injury or death from an air pressurization failure.
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 3). 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.
WARNING Verify the installed transmitter does not physically interfere with 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 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.
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 power mode.
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.
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.
Starting a Dive on a Paired Descent Dive Computer 1 On the paired Descent dive computer, press START from the watch face. 2 Select a dive mode. See the owner's manual for your Descent dive computer for more information about supported dive modes. 3 Press 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 7).
Viewing the Transmitter Data Screens 1 During 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 7). The air time remaining (ATR) estimate for the selected transmitters. Your primary and secondary transmitters and their tank pressure values.
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. Your tank pressure is below the reserve %1 is below pressure level. "%1" is replaced with the reserve pressure. 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.
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.
Specifications Battery 3 V CR123A lithium Battery life Up to 100 hr. Thread type 7/ 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 tech nology) Up to 10 m (33 ft.) Underwater transmission range (sonar) Up to 10 m (33 ft.
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. 1 Select 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.
My transmitter battery is draining rapidly If your transmitter battery is draining faster than the expected battery life (Specifications, page 13), 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.
Index A accessories 13 B battery 12 replacing 12 C cleaning the device 12 D data, screens 7, 10 device care 12 diving 7, 9–11 I installing 2–4 P pairing 6 R replacing the battery 12 S settings 6, 7, 11 specifications 13 T troubleshooting 11, 13–15 16 Index
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