Systems check
Hold body Guard in the hand
Plug the T- piece connection with a T - piece connection cap
Ensure oxygen pressure is above 165 bars
Clack open the oxygen cylinder valve
Observe 900 software and battery status
Icon to close the oxygen cylinder valve will appear
Close the oxygen cylinder valve
Observe pressure drop to 100 or below
Icon to open the oxygen cylinder valve will appear
Open the oxygen pressure fully and a half turn back
Shout pressure to captain or record pressure