Suunto HELO2 Battery power indication, Diving at altitude, Alt. adjustment value Altitude range

•the altitude and personal adjustment settings are correct

•the instrument displays correct units of measurement (Metric/Imperial)

•the instrument displays the correct temperature and depth (0.0 m/0 ft)

•the alarm beeps

If the optional wireless pressure transmitter is used ensure that:

•the pressure transmitter has been properly attached and the cylinder valve is open

•the transmitter and the wrist unit have been properly paired on a suitable code

•the pressure transmitter is working (wireless transmitter indicator blinks, cylinder pressure is displayed), and that there is no low battery warning displayed

•you have enough gas for your planned dive. You should also check the pressure reading against your back-up pressure gauge

And, if set to MIXED GAS mode, make sure that:

•the oxygen partial pressure limits are set correctly

For more information on the MIXED GAS mode, refer to Section 6.2. Diving in MIXED GAS mode .

The dive computer is now ready for diving.

5.10.3. Battery power indication

Temperature or internal oxidation of the battery affect the battery voltage. If the instrument is stored for a long period, or used in cold temperatures, the low battery warning may be displayed even though the battery has enough capacity. In these cases, re-enter DIVE mode to receive the battery power indication.

After the battery check, the low battery warning is indicated by the battery symbol.

If the battery symbol is displayed in the Surface mode, or if the display is faded or weak, the battery may be too low to operate the dive computer, and battery replacement is re- commended.

NOTE	For safety reasons, the backlight cannot be activated when the low
	battery warning is indicated by the battery symbol.

The optional wireless pressure transmitter sends out a low battery (LOb) warning when its battery voltage is getting low. This is shown intermittently instead of the pressure reading. When you get this warning, the pressure transmitter's battery needs to be replaced.

5.10.4. Diving at altitude

The dive computer can be adjusted both for diving at altitude and also to increase the conservatism of the mathematical nitrogen model.

When programming the instrument for the correct altitude, you need to select the correct Altitude Adjustment settings according to Table 5.4, Altitude Adjustment settings. The dive computer will adjust its mathematical model according to the entered altitude setting, giving shorter no-decompression times at higher altitudes.

Table 5.4. Altitude Adjustment settings

Alt. adjustment value	Altitude range
A0	0 - 300 m / 0 - 1000 ft
A1	300 - 1500 m / 1000 - 5000 ft

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