Dive depth management
To reduce the risk of oxygen poisoning, the diving depth should be limited so that the partial pressure of oxygen in the breathing gas does not exceed 1.4 atm.
Therefore, the safe depth for oxygen poisoning depends on the oxygen ratio of the Nitrox used.
The safe depth against oxygen poisoning is called Maximum Oxygen Depth Limit (MOD), which can be calculated by the following formula.
MOD (round down below decimal point) = (1.4 ÷ partial oxygen pressure of breathing gas -1) × 10
For example, when using EAN32, the oxygen partial pressure of EAN32 is 0.32, so using the above formula,
MOD = (1.4 ÷ 0.32-1) × 10 = 33 m.
Also, when using EAN36, the oxygen partial pressure of EAN36 is 0.36, so using the above formula,
MOD = (1.4 ÷ 0.36-1) × 10 = 28 m.
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Labeling
Write down the oxygen concentration measured with an analyzer and the oxygen limit depth obtained by calculation on a piece of duct tape and attach it to the tank.
For example, if the measured oxygen concentration by an analyzer is 36.3%, the measurement date is March 12, the calculated MOD is 28 m, and the writer is Taro Yamada, enter the following.
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