IANTD Enriched Air (Nitrox) 2025 – 400 Free Practice Questions to Pass the Exam

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What is the recommended Maximum Operating Depth (MOD) for EAN 32 without exceeding a PO2 of 1.5 ATA?

100 fsw (30 msw)

120 fsw (36 msw)

To determine the recommended Maximum Operating Depth (MOD) for EAN 32 while ensuring that the partial pressure of oxygen (PO2) does not exceed 1.5 ATA, it's important to understand the relationship between the fraction of oxygen in the gas mix and the depth of the dive.

EAN 32 means that the mixture contains 32% oxygen and 68% nitrogen. The formula to calculate the MOD is:

\[ \text{MOD} = \frac{(PO2 \, \text{in ATA}) \times (10)}{(Fraction \, of \, O2)} \]

In this case, we want to keep the PO2 at a maximum of 1.5 ATA for safety. The fraction of oxygen in EAN 32 is 0.32. Plugging these values into the formula:

\[ \text{MOD} = \frac{(1.5 \, \text{ATA}) \times (10)}{0.32} \]

Calculating this gives:

\[ \text{MOD} = \frac{15}{0.32} \approx 46.875 \text{ meters} \]

Now, converting meters to feet (1 meter = 3.281

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140 fsw (42 msw)

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