EVALUATION OF MODIFIED POCKET TYPE OXYGEN MASK LEAK TESTER.
NAVAL SCHOOL OF AVIATION MEDICINE PENSACOLA FLA
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Two samples of a modified McKesson pocket type volumetric demand mask leak tester were evaluated from the point of view of their suitability as field type mask leak testers. Physical tests were made of leakage, friction, volume calibration, suction and pressure during volume expansion, disconnect leakage and separation force, the new closed position lock and the size and position of the new open circuit breathing vent. Calibration data were prepared relating bellows extension time and air leak volume to mask nitrogen in collected expired gas as determined by magnetic and chemical analysis. Author