Suunto D9 Watch User Manual


 
6.1.3. Tank pressure data
When using the optional wireless pressure transmitter, the pressure of your scuba
cylinder in bars (or psi) is shown digitally in the lower left corner of the alternative
display. Whenever you start a dive, the remaining air time calculation begins. After 30
- 60 seconds(sometimes more, dependingon yourair consumption), thefirst estimation
of remaining air time will be shown in the left center window of the display. The
calculation is always based on the actual pressure drop in your cylinder and will
automatically adapt to your cylinder size and current air consumption.
CURRENT TANK PRESSURE
IS 168 BAR AND THE REMAINING
AIR TIME IS 19 MINUTES.
The change in your air consumption will be based on constant one second interval
pressure measurements over 30 - 60 second periods. An increase in air consumption
will influence theremaining airtime rapidly, while adrop inair consumptionwill increase
the air time slowly. In this way, an over optimistic air time estimation, caused by a
temporary drop in air consumption, is avoided.
The remaining airtime calculationincludes a 35bar/500 psisafety reserve. Thismeans
that when the instrument shows the air time to be zero, there is still about 35 bar/500
psi of pressure left in your cylinder, depending on your air consumption rate. With a
high consumption rate, the limit will be closer to 50 bar/725 psi and with a low rate
closer to 35 bar/500 psi.
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