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In the “SP low” item, set the value of your low setpoint in ppO2 bars. Notice: the Freedom is not a
control computer for your automatic solenoid valve for oxygen dosing. The Freedom serves only for
calculating decompression on the basis of:
a) measured ppO2 in the breathing circuit (Measured CCR mode)
b) set ppO2 in the Freedom computer (Fixed CCR mode)
For the most precise decompression calculation possible in the Fixed CCR mode, switch the Freedom
to the corresponding setpoint when changing the setpoint on the control unit of your rebreather. We
recommend setting a slightly lower setpoint than the actual setpoint on your rebreather. By doing so,
you ensure a safety reserve that partially eliminates the error consisting in variation of the partial
pressure in the circuit. Variation of the partial pressure of oxygen in the breathing circuit is caused by
numerous factors and it cannot be effectively prevented.
SP low sets the low setpoint. Select the item with KEY 1 and change the value by tilting or tapping.
The values are shown in bars. The default value is 0.7 bar.
SP High sets the high setpoint. Select the item with KEY 1 and change the value by tilting or tapping.
The values are shown in bars. The default value is 1.3 bar.
Before diving, do not forget to set the bailout gases. Setting the bailout gases is identical to setting
“Mixtures” for open circuit.
Faulty sensors
In the “Faulty sensors” item, it is possible to remove faulty sensors that significantly deviate from the
values of other sensors or are completely nonfunctional. By doing so, you will remove the given
sensor from the calculation of the ppO2 average, which is used for calculating decompression and
other computed values.
Place the cursor on the defective sensor and use KEY 1 to change the value from “Normal” to
“Disabled”.
Oxygen-sensor calibration
If you use the Freedom in the measured ppO2 mode, it is necessary to calibrate the oxygen sensor
prior to every dive. The calibration menu is found in the Main menu/Dive/Calibration.
Calibration settings
Prior to the actual calibration, it is necessary to set the corresponding calibration values. Go to the
Change item and select it with KEY 1.
In the “Oxygen purity” item, set the value that corresponds to the fraction of oxygen in the gas that
you are preparing to calibrate.
The “Warning days” item comprises time data according to which the Freedom will notify you of the
age of the calibration. To change the value, move the cursor to the item, select it by pressing KEY 1
and set the value by tilting or tapping. The default value is seven days; the setting range is 0-30 days.
The “Valid days” item is a time value after the expiry of which the calibration is considered to be
invalid and new calibration is required. To change the value, move the cursor to the item, select it by
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