3M SCOTT AIR-PAK X3 PRO Operating & Maintenance Instructions page 40

OPERATING THE RESPIRATOR
3 Slowly open the cylinder valve fully by turning the valve knob counterclockwise until it stops (approximately 2 1/2
full turns of the knob).
4 Observe the operation of the alarms:
•
The Vibralert end-of-service indicator alarm starts and then stops. If you do not fully depress the air saver/
donning switch on the E-Z Flo+ regulator or the auto air-saver switch on the E-Z Flo C5 regulator latch prior
to opening the cylinder valve, the Vibralert will not actuate due to air flowing freely on the facepiece.
d The HUD initializes for twenty (20) seconds and then displays the cylinder air level.
e The PASS device (distress alarm) actuates when the cylinder valve is opened and sounds three quick chirps; a
green flashes on the remote pressure gauge console.
5 With facepiece sealed to face, inhale sharply to actuate the respirator. Air will then be supplied during inhalation.
TIP
If air is not supplied on first inhalation, check the following:
•
The cylinder valve is fully open.
•
The remote pressure gauge indicates pressure in the cylinder.
•
The facepiece is sealed to the face.
6 Always check the facepiece seal, the system seal, and the operation of the end-of-service alarms:
a Completely close the cylinder valve by pushing in on the cylinder valve and rotating it clockwise.
b Breathe using the respirator. As the air pressure falls in the respirator, one or more of the end-of-service
indicator alarms will actuate.
c As soon as any end-of-service indicator alarm starts, hold your breath momentarily and make certain that the
Vibralert and HUD both actuate. (The Vibralert clicks rapidly, and the HUD red light flashes rapidly.)
d Resume breathing on the respirator until all air stops flowing from the breathing regulator.
e Perform a negative pressure leak test: Inhale slowly and hold your breath momentarily. Make sure that you
do not detect any air flowing into the facepiece and that the facepiece forms a tighter seal with your face.
f Open the cylinder valve and breathe normally. The electronic end-of-service time indicator sounds briefly and
then stops.
g If the environment is suitably quiet, you can detect air leaking from the facepiece by listening for a flow of air
while holding your breath. Inhale and hold your breath momentarily. Do not engage the air-saver
mechanism. Make sure that you do not hear air flowing into the facepiece from the regulator and that you
do not detect air flowing outward from the facepiece.
7 Put on any other required protective head gear or protective clothing. Be sure that any head gear, helmet, or
protective clothing does not interfere with the use of the respirator. You must be able to move your head freely
without dislodging the facepiece or disturbing the face-to-facepiece seal.
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Figure 3-13 Attaching the regulator (Vision C5 facepiece shown)
P/N 595373-01 Rev C 202004