What is the primary function of the airflow metering aneroid assembly in oxygen diluter demand regulators?

In oxygen diluter demand regulators, the primary function of the airflow metering aneroid assembly is to regulate airflow in relation to cabin altitude. This assembly plays a crucial role in ensuring that the amount of supplemental oxygen delivered to the user is proportional to the altitude of the cabin. As altitude increases and the air pressure decreases, the aneroid assembly responds by adjusting the airflow, allowing for an adequate supply of oxygen to maintain physiological needs.

This regulation is vital in preventing hypoxia, which can occur at high altitudes where the partial pressure of oxygen is insufficient for normal respiration. The assembly ensures that as the cabin altitude fluctuates, the oxygen mixture remains effective for passenger safety and comfort, delivering more oxygen when needed and less at lower altitudes. Consequently, managing airflow in relation to changing cabin altitude is essential for optimal oxygen delivery in aviation settings.