Annual Checks; Functional Checks - MSA S-Cap-Air Maintenance Manual

3.3

Annual Checks

Complete visual inspection for any mechanical damage such as cuts, tears, abrasion, or
other mechanical damage on the following components:
•
Bag, harness and firing strap.
•
Air hose, hose connector and its O-ring. Damaged, stiffened, brittle hoses and O-rings
must be replaced. O-ring for hose connection port [part no. 10024118]
•
Hood, neck-seal and nose cup. The exhalation valve disk must be replaced all 3 years
[part no. D2055749].
•
Regulator valve and pressure indicator.
•
Cylinder. Test cylinder according to national regulations.
•
Any damaged or disabled parts/components must be replaced.
3.4

Functional Checks

In addition to the visual inspection described above, the S-Cap-Air must be tested for its
proper function. The tests and test results are to be recorded and filed with respective se-
rial numbers and date. Any parts/components damaged or disabled must be replaced.
3.4.1 Standard Functional Test
To do so, a properly charged S-Cap-Air is started, the warning indicator is kept under ob-
servation. It must change from GREEN to RED after 15 minutes at the earliest and after 18
minutes at the latest. During this period, the pressure indicator indication must change
slowly but continuously from full to empty. After the test is successfully passed, the S-Cap-
Air must be recharged and packed again (see 2.1 and 2.2).
3.4.2 Functional Test with Flow Meter
Pull clip from hose connection, then pull supply hose off the connection. Connect Flow
Meter (30 up to 50 l/min) with hose connector. Open cylinder valve of a properly charged
S-Cap-Air briefly by turning open the valve cap and read value on the scale of the flow
meter. The value must to be between 35 and 41 l/min. Close the air cylinder valve again
until the air flow stops. Disconnect Flow Meter and connect hose and clip back to the hose
connector. Open cylinder valve briefly by turning open the valve cap and read warning in-
dicator. The warning indicator must be fully GREEN. Close the air cylinder valve again un-
til the air flow stops. The warning indicator now must change from GREEN to RED. Then
turn in the valve cap another 60°. Now the firing pin must be parallel in line with the hose
connection. If it is not, turn valve cap loose again, pull firing pin out and put it back into the
cap on the opposite side. Then close the valve again as explained above.
Note : The additional turn of 60° beyond the valve closing point [air flow stops] assures
a properly and tightly closed valve. Any over-tightening beyond this would con-
siderably increase the required activation force.
Check the cylinder pressure and top up if necessary (see 2.1)
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