4
NOTE: REPLACEMENT INTERVALS FOR COMPONENTS ORIGINATING FROM A SPARES PACK
MARKED WITH A SHELF LIFE MUST BE CALCULATED FROM THE
DATE OF FIRST USE
OF THE
COMPONENT AND NOT FROM THE SHELF LIFE EXPIRY DATE.
NOTE: FOR CALCULATING PERIODIC MAINTENANCE DATES THE
‘DATE OF FIRST USE’
IS THE
DATE ON WHICH THE END USER TAKES DELIVERY OF A COMPLETE VISION 2 FACEMASK
FROM THE SUPPLIER OR IN THE CASE OF SPARES, THE DATE ON WHICH THE
REPLACEMENT COMPONENT IS FITTED TO THE VISION 2 FACEMASK.
REPLACEMENT OF VISOR
1.
Release head harness and remove from facemask.
2.
Remove the screws from the front cover (1) and remove front fitting from inside of mask. Unscrew
the two visor clamp screws (10), remove the visor clamps and the visor.
3.
Inspect O-ring (5) and if necessary replace. Lubricate new O-ring with MS4 silicone grease.
4.
Position the visor over the front fitting, ensuring that the hook on the front fitting engages outside
the visor. Fit the tab at the top of the visor through the slot at the top of the silicone outer mask and
feed the visor into the groove in the outer mask.
5.
Fit the visor clamps and secure with screws and nuts. Replace front cover (1) and secure with
screws. Ensure that the front fitting encloses the visor rim and beds smoothly onto the front of the
body front fitting (7).
6.
Fit head harness.
Replacement of Inhale Valve
1.
Push out the inhale valve (4) from inside the facemask.
2.
Fit the new valve flap (3) over the valve frame boss. Push the inhale valve assembly into the
facemask breathing hose inlet and check that the flap lies flat on the valve frame.
Replacement of Exhale Valve
1.
Remove the front fitting (7) and push the exhale valve assembly from inside the mask, out through
the front fitting. Check that the flap and O-ring are in good condition. If necessary replace both.
2.
If the O-ring is replaced it must first be lubricated with MS4 silicone grease.
Replacement of Inner Mask Inhale Valves
The valve flaps are located on the inner side of the inner mask
1.
Carefully pull the inhale valve flaps and valve pins (18) from inner mask (19). Clean the inner mask
and fit new valve flaps.
2.
Check that the valve flaps move freely on the pin and lie flat on the inner mask.
Important:
Check the valve flaps before each use to ensure that they are clean and undamaged.
Check that the inhalation valve flaps are flexible.
Valves and O-rings must be replaced if they are damaged in any way and at least annually,
regardless of condition.
Storage Note: Rubber components should always be stored in clean, dry conditions away from
direct sunlight and heat.
Replacement of Speech Diaphragm
1.
Rotate the speech diaphragm retainer (19) 10° anti-clockwise and withdraw the retainer, speech
diaphragm and O-ring (8). Check that the speech diaphragm is in good condition and replace if
necessary. Lightly lubricate the replacement O-ring with MS4 silicone grease.
