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5.3
Maintenance of the Exhalation Valve
The year of manufacture is located on the valve disc.
In case of a leak remove the exhalation valve disc and replace it with a new one as follows:
(1)
Open the pivot cap of the connector.
(2)
Carefully remove the spring retainer with spring.
(3)
Pull of valve disc with guide pin.
(4)
Replace valve disc with pin and reassemble mask in reverse order.
(5)
Close the pivot cap of the connector.
(6)
Perform a tightness test [ chapter 5.5].
5.4
Replacing the Speech Diaphragm
The year of manufacture is located on the speech diaphragm.
(1)
Unbutton the nose cup.
(2)
Unscrew the threaded socket from the mask inside with the special tool.
(3)
Remove the speech diaphragm.
(4)
Assemble the new speech diaphragm with the gasket towards the connector.
(5)
Perform a tightness test [ chapter 5.5].
5.5
Tightness Test of the Mask
The testing of the masks for tightness is performed using an applicable MSA test device
in accordance with the relevant operating manual.
(1)
Fit mask tight onto the test instrument.
(2)
Generate a negative pressure of 10 mbar.
(3)
Measure the pressure change after 1 min.
The mask including the exhalation valve meets the requirements if for a moistened exhala-
tion valve and a negative pressure generated inside the mask the pressure change does not
exceed 1 mbar in a minute.
Leaking masks must not be used.
Opening Pressure Test of the exhalation valve
The opening pressure of the exhalation valve has to be at least 4.2 mbar, otherwise the mask must not
be used.
Ultra Elite Full Face Mask – Positive Pressure
Maintenance
GB
13
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