What is the purpose of the automix lever in diluter-demand oxygen systems?

The automix lever in diluter-demand oxygen systems is designed to automatically mix cabin air with oxygen. This allows the system to provide an appropriate concentration of oxygen tailored to the needs of the user, especially in high-altitude environments where the partial pressure of oxygen is reduced. The dilution of oxygen with ambient air prevents the user from receiving pure oxygen at altitudes where that level may be unnecessary, helping to improve comfort and prevent oxygen toxicity. The adjustability of the automix lever enables users to receive oxygen that is blended with cabin air, facilitating a more efficient and safe breathing environment without the risks associated with solely high concentrations of oxygen.