Keyspan Full Face Mask 9000422 E - Manual (Page 5)

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5. Maintenance and storage
5.1 Test for function and leak-tightness
If components have been replaced (visor, valve discs or speech diaphragm), a test for function and
leak-tightness must be carried out with an appropriate test device (e.g. Pro-Tester). The test is also
done in case of a mask stored unused for a longer period, and at least once a year. Check also that
the faceblank has maintained its shape, the head harness is reasonably elastic, the visor and the
sealing edge are undamaged, and that the valve discs and the speech diaphragm’s O-ring are good
and well in position. Damage must be repaired.
5.2 Replacing the visor
The visor material code is found in the right upper corner of the visor. Replace visor if damaged, dirty
or scratched.
Material codes:
F
polycarbonate
( ) triplex (chemical resistant laminated glass)
• Unscrew the screws (crosshead Phillips), loosen the visor frames, and remove the visor (fig. 6).
• Place a new visor in the faceblank (see the marking “up/down” on the visor). Align the check marks
of the visor and faceblank with each other (fig. 7).
• Press the upper frame into place (fig. 8).
• Bend the mask at the connector to give space for the lower frame under the connector support
piece (fig. 9). Tighten the two screws.
• Carry out the leak-tightness test (point 5.1).
Fig. 6 Fig. 7 Fig. 8 Fig. 9
5.3 Replacing the exhalation valve disc
• Pull out the connector lid (fig. 10).
• Separate the exh. valve disc (grey) from the exh. valve body (pinch on the edge of the disc) (fig.
11).
• Replace the disc. Pull the disc tail through the central hole (fig. 12) to the inner side of the mask to
secure a good fit.
Fig. 10 Fig. 11 Fig. 12