Nitrox Enriched Air And The Magic Circle
The easiest Nitrox (Enriched Air) calculations you will ever do. By using the Magic Circle, you can calculate your Oxygen Dose, Maximum Operating Depth, and Best Mixture for any dive you decide to make. To do your calculations, remember that you only need two parts of the formula to get the third. If you are working top to bottom, you will use division, and if working side to side, you use multiplication. The top section of the circle will be you Oxygen Dose (PPO2 1.4 or 1.6). The bottom left of the circle will be the percentage or blend of Nitrox you will use. The bottom right of the circle will be your ATA (Absolute Atmospheric Pressure) or Depth once converted. Using the formulas listed below will make your Nitrox experience more safe and more practical.
The Magic Circle
Oxygen Dose
PO2 = FO2 x Pt
MOD
Pt = PO2 / FO2
Best Mixture
FO2 = PO2 / Pt
EAD (Equivalent Air Depth)
[(FN2 / 0.79)(D+33)] - 33
Absolute Pressure
Pt = (D / 33) + 1
Pt = (D + 33) / 33
Converting Absolute Pressure to Depth
D = (Pt - 1) x 33
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