Biomedical aspects of oxygen regulator performance: I. Static characteristics.
Static performance characteristics of current-inventory USAF oxygen regulators were evaluated with the use of a specialized regulator test stand. Outlet suction pressures, flows, positive pressures, and delivered oxygen dilutions were monitored and recorded as functions of operational altitudes. General findings indicated that: 1) excessive oxygen addition occurs in all models, especially at low cabin altitudes; 2) positive pressure schedules generally conform to specifications; 3) negative suction pressures for most regulators are less than -2.54 cm H2O. The validity of static evaluation is discussed and data interpretation is considered with respect to biomedical compatibility emphasizing maintenance of crewmember physiological sufficiency.
Biomedical aspects of oxygen regulator performance: I. Static characteristics. Static performance characteristics of current-inventory USAF oxygen regulators were evaluated with the use of a specialized regulator test stand. Outlet suction pressures, flows, positive pressures, and delivered oxygen dilutions were monitored and recorded as functions of operational altitudes. General findings indicated that: 1) excessive oxygen addition occurs in all models, especially at low cabin altitudes; 2) positive pressure schedules generally conform to specifications; 3) negative suction pressures for most regulators are less than -2.54 cm H2O. The validity of static evaluation is discussed and data interpretation is considered with respect to biomedical compatibility emphasizing maintenance of crewmember physiological sufficiency.