Specifications

FUNCTIONAL TESTS
FUNCTIONAL CHECKS
(AFTER EACH USE AND MONTHLY)
1. Check that the regulator and facepiece can hold a
negative pressure.
a. Close the cylinder valve.
b
.Hold the facepiece against your face to create an
e
ffective seal.
c
. Attach the regulator to the facepiece and inhale
until the facepiece begins to collapse against your
face. Hold your breath for about 10 seconds. The
negative pressure should be maintained and the
facepiece should remain collapsed against your
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
SCBA. 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. Don the facepiece or hold the facepiece against
your 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 cer
tified r
epairperson.
3. NightFighter Heads-Up Display System and Audible
Alarm with URC Assembly
a. MSA r
ecommends that the function of the Audi-
Larm Alarm with URC Assembly, ICM Unit and
NightFighter Heads-Up Display System war
ning
device be checked by observing the Pressure
Gauge or ICM Unit Gauge at which the alarms ring
and tone. This test should be performed with a min-
imum cylinder pressure of 1,200psig for the Low
Pressure SCBA, 1800psig for 3000psi system and
2,000psig for the High Pressure SCBA.
b.Pressurize the system by opening the cylinder valve
f
or a moment and then closing it. The alarms should
r
ing or tone, indicating they are cocked and armed.
c
. Open bypass slowly.
d.Watch the drop in pressure on the Pressure Gauge
or ICM Unit gauge and the point at which the Audi-
Larm Alarm with URC Assembly begins to ring and
the NightFighter Heads-Up Display System
Receiver begins to flash. Nominal gauge readings at
which the alarm should start to ring and tone or
flash are listed below.
530psig-approximately (low pressure system)
750psig-approximately (3000psi system)
1175psig-approximately (high pressure system)
e. The alarms should continue until the air pressure is
approximately 200psig or less. If the Audi-Larm
Alarm with URC Assembly, ICM Unit Gauge or
NightFighter Heads-Up Display System does not
function properly, the apparatus must be removed
from service.
4. Audi-Larm Alarm with URC Assembly Body
a. Check that the bell is on tightly and is in the proper
alignment.
b.Check URC Assembly and relief valve for damage
or leaks.
c. Close the cylinder valve completely. Be sure that
nothing blocks the regulator outlet.
Do not disconnect the Audi-Larm coupling nut when
pressure is shown on the regulator gauge. Release all
pressure from the regulator by opening the bypass
valve. Removing the coupling nut with the regulator
pressurized can result in serious personal injury,
death, or damage to equipment.
d.Open the bypass valve slowly to release trapped air.
Close bypass valve.
e. Unscrew the Audi-Larm coupling nut from the cylin-
der valve. It is hand-tight and should not require
tools.
f. Inspect the coupling nut for thread damage. Also be
sur
e there is an O-ring and that it is not damaged.
g. Replace the O-ring if it is damaged.
33
T
AL 606 (L) Rev. 16 - 10023638
WARNING