Table of Contents
Advertisement
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:
(6)
Open the pivot cap of the connector.
(7)
Pull the old exhalation valve disc off the connector.
(8)
Replace the defective components.
(9)
Close the pivot cap of the connector.
(10)
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 device.
Use the test plate or test band to fix the mask.
(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.
Ultra Elite-H Mask – Negative Pressure
Maintenance
GB
16
Advertisement
Table of Contents
