MSA Air Mask Maintenance
CHECK LIST
1.
Mask and Hose - Examine for contamination, damage and
deterioration.
2.
Stretch Hose - Check for tightness of assembly and cracking.
3.
Examine Harness for wear and function of hardware.
4.
Test unit as worn (Regulator hooked up to cylinder).
a. Check cylinder gage for full indication (2216 P.S.I. on Ultralite
units; 4500 P.S.I. on Custom 4500 Air Mask). Replace or recharge
cylinder if pressure is less than that stamped on the cylinder. (This
procedure should be done at least weekly.)
b. With main-line (yellow) closed, open cylinder valve to pressurize
regulator and hose.
c. Place hand over regulator outlet to block it leaktight.
d. Open the mainline valve.
e. Close cylinder valve. Compare regulator gage to cylinder gage.
Plus or minus 100 P.S.I. (200 total) allowable.
f. Watch regulator gage for drop in reading which would indicate
leakage. (Check instruction card furnished with apparatus for
allowable leakage.)
g. Take hand from regulator outlet slightly and check regulator gage
for indication of pressure at which Audi-Larm rings. Alarm should
ring at about 1/4 full.
h. With cylinder valve closed, breathe out remaining pressure, if
necessary.
MINE SAFETY APPLIANCES COMPANY
600 Penn Center Boulevard, Pittsburgh, PA 15235 USA
489 (L) Rev. 5
466051
