Draeger BG-4 Self Contained Breathing Apparatus Procedures for Getting Under Oxygen:
Procedures for Getting Under Oxygen: Put on facepiece properly and tighten straps Open cylinder valve fully, then close one-half turn Observe the monitron or sentinel pressure gauge and warning module: Green indicator light - apparatus O.K Red indicator light - apparatus faulty PSI reading
Procedures for Getting Under Oxygen: Tightly squeeze both breathing hoses and breathe in until a vacuum is produced. Hold your breath for an instant; The vacuum must be maintained, otherwise the straps on the mask must be tightened.
Procedures for Getting Under Oxygen: Check gauge and operation, straps, etc., prior to leaving fresh-air base.