WARNING!
Do not remove the facepiece in a contaminated area to replace the lens cartridge. The contaminant will remain in the
surrounding air after abrasive blasting. Return to a safe atmosphere before removing the respirator.
Misuse can cause inhalation of the contaminant resulting in serious respiratory injury or death.
5.2
Supplied-Air Respirators
Adjusting Air Flow on Adjustable Valve Connectors
1. Push in on the adjusting knob, then turn the knob.
2. Turn the knob fully clockwise (up) for minimum air flow.
3. Turn the knob fully counter-clockwise (down) for maximum air flow.
NOTE:
The adjusting knob may vary air flow, but cannot reduce flow below the required minimum 4 cfm rate when the proper
pressure is used at the inlet of the air-supply hose from MSA.
5.3
Combination Duo-Flo Type Respirators
Converting to Different Modes of Operation
1. When using the respirator in the air-purifying mode of operation, the supplied-air mode is entered when an air-line air
supply is connected to the Duo-Flo valve. The air-line inlet pressure must be 35-40 psig for single exhalation valve
facepieces and 32-37 psig for dual-exhalation valve facepieces in order to maintain 4 cfm to the facepiece.
2. When using the respirator in the supplied-air mode of operation, the air-purifying mode is entered when the air-line air
supply is disconnected from the Duo-Flo valve. The air-purifying mode is entered “automatically” if the air-line source is
lost for any reason.
21
Abrasi-Blast Respirator
US
5 Using the Respirator
