1. Check the breathing hoses : This is made by an Positive pressure test, a negative
pressure test, a flow gas test and a mouth piece verification.
Positive pressure test:
(a) Block the output of the breathing hose with the hand (black side).
(b) Blow by the mouth piece.
The gas
should not
be able to pass through (you can listen if any leak at the white
connection).
negative test:
(a) Block the input of the breathing hose (white side).
(b) Inhale by the mouth piece.
The gas
should not
be able to pass through. (you can listen if any leak at the black
connection)
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