Why is it important to monitor the oxygen percentage when using EANx?

Monitoring the oxygen percentage when using Enriched Air Nitrox (EANx) is crucial primarily to prevent oxygen toxicity. EANx typically contains higher levels of oxygen than regular air, so understanding and managing the concentration is essential for diver safety.

Oxygen toxicity can occur when divers breathe oxygen at partial pressures that exceed safe levels, which can lead to various adverse effects, including central nervous system (CNS) issues. By keeping track of the oxygen percentage and ensuring it remains within safe limits, divers can mitigate the risk of toxicity while enjoying the benefits of enriched air, such as extended bottom times and reduced nitrogen absorption.

Proper monitoring helps divers adhere to safe dive practices, ensures they remain within the recommended operational guidelines, and allows for enjoyable yet safe diving experiences.