MSA Air Mask MaintenanceCHECK LIST1.Mask and Hose - Examine for contamination, damage anddeterioration.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 Ultraliteunits; 4500 P.S.I. on Custom 4500 Air Mask). Replace or rechargecylinder if pressure is less than that stamped on the cylinder. (Thisprocedure should be done at least weekly.)b. With main-line (yellow) closed, open cylinder valve to pressurizeregulator 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 indicateleakage. (Check instruction card furnished with apparatus forallowable leakage.)g. Take hand from regulator outlet slightly and check regulator gagefor indication of pressure at which Audi-Larm rings. Alarm shouldring at about 1/4 full.h. With cylinder valve closed, breathe out remaining pressure, ifnecessary.MINE SAFETY APPLIANCES COMPANY600 Penn Center Boulevard, Pittsburgh, PA 15235 USA489 (L) Rev. 5466051
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