When managing oxygen with an EANx compatible dive computer, what is the first step?

In managing oxygen with an EANx compatible dive computer, the first step is to calibrate the analyzer for the air supply. This step is crucial because it ensures that the dive computer correctly identifies and adjusts for the specific mix of gases present in the tank, particularly the percentage of oxygen.

Calibrating the analyzer allows the diver to accurately determine the enriched air nitrox (EANx) mix in the tank, which directly affects the dive plan, including depth limits and no-decompression times. Without this calibration, using the dive computer could lead to inaccurate readings, potentially jeopardizing safety by exceeding oxygen exposure limits during the dive. This initial step establishes a foundation for safe, precise diving with enriched air.

Setting the maximum oxygen level and adjusting depth limits can only be done accurately once the proper gas mix has been calibrated, making calibration the essential first step in the process.