VISUAL INSPECTION AND FUNCTIONAL CHECKS
FUNCTIONAL CHECKS (AFTER EACH USE AND
MONTHLY)
1. Check that the regulator and facepiece can hold a
negative pressure.
a. Verify that the cylinder valve is closed.
b. Hold the facepiece against the face to create an
effective seal.
c. Attach the regulator to the facepiece and inhale
until the facepiece begins to collapse against the
face. Hold breath for about 10 seconds. The nega-
tive pressure should be maintained and the face-
piece should remain collapsed against the face for
the entire 10 seconds.
d. Do not use the apparatus if negative pressure can-
not be maintained in the facepiece. Return the regu-
lator and facepiece to a certified repairperson.
2. Check second stage regulator operation.
a. Push the regulator release buttons.
b. Verify that the regulator bypass knob is fully closed
(clockwise).
c. Slowly open the cylinder valve to pressurize the res-
pirator. Verify that the cylinder valve is completely
opened.
d. Check the pressure gauge to verify that the cylinder
is full. Regulator functional checks must be con-
ducted with a full cylinder.
e. Open the regulator bypass knob (counter-clock-
wise). Verify that air flows from the regulator. Close
the bypass knob (clockwise).
f. Attach the regulator to the facepiece. Verify proper
regulator attachment by pulling on the regulator.
g. Hold the facepiece against the face to create an
effective seal.
h. Inhale sharply to start air flow. Breathe normally.
Verify proper regulator response. The regulator
should not make any unusual sounds including:
whistling, chattering, or popping.
i. Remove the facepiece from the face. Verify that air
flows freely. Push the regulator release buttons.
Verify that air flow stops.
j. If the regulator fails to meet any of the above
checks, remove the apparatus from service. Return
the regulator to a certified repairperson.
3. Check the attachment hose quick-disconnect plug.
A.Verify that no air flows through the plug when the
cylinder valve knob is open.
4. After completing the functional checks, recharge the
cylinder and valve assembly before storing it.
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TAL 903 (L) Rev. 1 - 10063148
