Suunto DX User Manual page 45

NOTE: While setting the gases, notice that the calculated
maximum operating depth is displayed in the upper field. You
cannot change to this gas before you have ascended above this
depth.
3.11.3.3 Setpoints
In CCR mode there are two setpoint values that you can set, low
and high. Typically you do not need to modify the default setpoint
values. However, you can change them as needed either in DM5 or
under the CCR mode settings.
Low set point: 0.4 – 0.9 (default: 0.7)
•
High set point: 1.0 – 1.6 (default: 1.3)
•
To change set point values:
1. While in CCR mode, keep [DOWN] pressed.
2. Press [UP] to scroll to SETPOINT and press [SELECT].
3. Press [DOWN] or [UP] to choose LOW SETPOINT and press
[SELECT].
4. Press [DOWN] or [UP] to set value for PO 2 and accept with
[SELECT].
5. Repeat steps 2-4 for HIGH SETPOINT if necessary.
6. Press [MODE] to exit.
Setpoint switching
You can use automatic or manual setpoint switching. The automatic
low setpoint switch depth is 4.5 m (15 ft) by default, and the high
setpoint switch depth is 21 m (70 ft).
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