Sundstrom SR 200 Mode D'emploi page 30

• Slacken the four elastic straps in pairs by moving the
strap holders forward. The two inelastic straps need
not be released. Fig. 5.
• Pull the head harness forward over your head and
remove the mask.
Clean and store the mask as required.
4. Maintenance
Personnel who are responsible for maintenance of the
equipment must be trained and well acquainted with
this type of work.
4.1 Cleaning
Sundström cleaning tissues SR 5226 which clean and
disinfect are recommended for daily care. If the mask is
heavily soiled, use a warm (up to +40 °C), mild soap solu-
tion and a soft brush, followed by rinsing with clean water
and drying in air at room temperature. Proceed as follows:
• Remove the adapter and filter.
• Remove the covers for the exhalation valves and remove
the membranes (two).
• Remove the inhalation membranes (three).
• Remove the head harness. (Optional – The harness
can be washed, but takes extra time to dry.)
• If necessary, remove the visor. See section 4.4.1.
• Clean as described above. Critical areas are the ex-
halation membranes and the valve seats which must
have clean and undamaged contact surfaces.
• Inspect all parts and replace with new parts as neces-
sary.
• Leave the mask to dry, and then assemble it.
NOTE! Never use solvent for cleaning.
4.2 Storage
The best way to store the mask, clean and dry, is in the
Sundstrom storage box SR 344. Keep it away from direct
sunlight or other sources of heat.
4.3 Maintenance schedule
The schedule below shows the minimum requirements
on maintenance routines, so that you will be certain that
the equipment will always be in usable condition.
Before
Visual inspection
Functional check
Cleaning
Membrane change
Head harness change
4.4 Spare parts
Use only genuine Sundström parts. Don't modify the
equipment. The use of 'pirate parts' or any modifications
may reduce the protective function and will compromise
the approvals granted to the product.
30
After Annually
X
use use
•
•
•
4.4.1 To change the visor
The visor is mounted in a groove running around the visor
opening of the outer mask and is held in place by one
upper and one lower frame half.
• Use a 2.5 mm Allen key to remove the two screws
holding the frame halves together. Fig. 6.
• Carefully remove the upper frame half. Fig. 7.
• Carefully prise the top part of the mask off the visor,
and remove the visor from the lower groove. Take
this opportunity to clean the groove, if necessary.
Fig. 8, 9.
• Markings are made to show the centres of the visor,
frame halves and mask. Press the new visor into the
groove, making sure that the centre markings are in
line. To make assembly easier, coat the slot with a
soap solution or similar liquid.
• Carefully prise the top half of the mask over the visor,
and make sure that the visor is in the groove in the
mask.
• Prise the upper frame half, making sure that the centre
markings are in line. Fig. 10.
• Fit the screws and tighten them alternately until the
two halves of the frame are firmly in contact.
Fitting a glass visor
Take great care to ensure that the visor is located ac-
curately so that the centre markings on the visor, frame
and mask are in line. This will prevent subjecting the visor
to stresses that could lead to its damage.
To make assembly easier, it is important that the grooves
in the mask and frame should be abundantly coated with
a rich soap solution or with a similar liquid.
4.4.2 To change the inhalation membranes
One membrane is in the centre of the inner mask on a
fixed dowel.
• Prise off the membrane and fit a new membrane. Fig.
11.
Two membranes are fitted, i.e. one on each inside
of the inner mask. The dowels for these membranes
are removable and should be changed whenever the
membrane is changed.
• Prise off the membranes and dowels.
• Prise the new membranes onto the new dowels.
• The membrane should rest on the larger flange, i.e.
thread the dowel with the membrane from the inside
of the mask, through the valve seat, with the smaller
flange first. Fig. 12, 13.
4.4.3 To change the exhalation membranes
•
The exhalation membranes are mounted on a fixed dowel
•
on the inside of the valve covers on each side of the
outer mask. The covers should be changed whenever
the membranes are changed.
• Snap the valve covers off the valve seats. Fig. 14
• Prise off the membrane. Fig. 15
• Press the new membranes onto the dowels. Carefully
check that the membranes are in contact with the valve
seats all round.
• Press the valve covers into place. A clicking sound
indicates that the cover has snapped into place.