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3. Use
3.1 Installation
See also the user instructions for fan unit SR 500/SR 500 EX/
SR 700 or compressed air attachment SR 507 whichever is
used.
SR 540 EX
Breathing hose
One end of the hose is provided with a flat gasket (Fig. 3a) and
the other with an O-ring (Fig. 3b). Connect the end with the
gasket to the face shield.
3.2 Donning
See also the user instructions for fan unit SR 500/SR 500 EX/
SR 700 or compressed air attachment SR 507 whichever is
used.
SR 520
• Adjust the head harness by adjusting the length of the Velcro
strap. This is important for ensuring a good fit. Fig. 4.
• Grip the hose mounting with one hand and, with the other,
hold the strap in the lower part of the hood. Fig. 5.
• Put your chin into the hood. Fig. 6.
• Keep hold of the strap and pull the hood over your head with
the hand holding the hose mounting.
• Adjust the hood so that it seals all the way round your face
and so that it fits firmly and comfortably. Fig. 7.
• To ensure a perfect fit, it may be necessary to take off the
hood and adjust the head harness.
• Make sure that the breathing hose runs along your back and
is not twisted. Fig. 8.
SR 530
• Adjust the head harness by adjusting the length of the Velcro
strap. Fig. 4.
• Hold the hood upside down. Grip each side of the hood
opening with one hand. Fig. 9.
• In one movement, put your chin in and then the rest of your
head into the hood. Fig. 10.
• With the same grip, pull the hood down so that the head
harness fits firmly and comfortably around your head.
• Adjust the neck size of the hood by means of the elastic
neck strap. Fig. 11.
• Make sure that the breathing hose runs along your back and
is not twisted. Fig. 8.
SR 540 EX
• Raise the visor and put the face shield on. Fig. 13.
• If necessary, adjust the head harness in height by lengthening
or shortening the strap for the top of the head. Fig. 14a.
• If necessary, adjust the circumference of the head harness
by means of the knob at the rear of the head harness. Fig.
14b.
• Lower the visor unit by pulling the face seal down under your
chin. A clicking sound indicates that the visor unit has been
lowered fully. Fig. 15.
• Insert a finger between your chin and the face seal and run
the finger along the contact surface of the face seal all the
way round to check that it fits well against the face. Fig. 16.
• Check that the breathing hose runs along your back and
that it is not twisted. Fig. 8.
3.3 Doffing
See the user instructions for fan unit SR 500/SR 500 EX/
SR 700 or compressed air attachment SR 507 whichever is
used.
4. Maintenance
The person who is responsible for cleaning and maintenance
of the equipment must have suitable training and be well
acquainted with work of this type.
4.1 Cleaning
Sundström cleaning tissues SR 5226 are recommended for
daily care.
If the equipment is more heavily fouled, use a soft brush or
sponge moistened with a solution of water and dishwashing
detergent or the like. Rinse the equipment and leave it to dry.
If necessary, spray the hood/face shield with 70 % ethanol or
isopropanol solution for disinfection.
NOTE! Never use a solvent for cleaning.
4.2 Storage
After cleaning, store the equipment in a dry and clean place
at room temperature. Store the face shield with the visor in
the fully raised or fully lowered position. Avoid exposing it to
direct sunlight.
4.3 Maintenance schedule
Recommended minimum requirements on maintenance
routines so you will be certain that the equipment will always
be in usable condition.
Before use After use Annually
Visual inspection
Performance check
Cleaning
Change of O-ring
for breathing hose
Change of gasket for
breathing hose (SR 540 EX)
Change of exhalation membrane
4.4 Change parts
Always use genuine Sundström parts. Do not modify the
equipment. The use of non-genuine parts or modification of
the equipment may reduce the protective function and put at
risk the approvals received by the product.
4.4.1 To change the exhalation membrane
The exhalation membrane is mounted on a pin on the inside of
the valve cover. The cover must be changed at the same time
as the membrane. Proceed as follows:
• Snap off the valve cover from the valve seat. SR 520/SR 530,
Fig. 17. SR 540 EX, Fig. 18.
• Slip off the membrane.
• Press the new membrane onto the pin. Carefully check that
the membrane is in contact with the valve seat all round.
• Press the valve cover into place. A clicking sound indicates
that it is in place.
4.4.2 To change the visor
The visors of the SR 520 and SR 530 cannot be changed.
SR 540 EX
The visor has two fixing points, one of which is of over-centre
type and is used for tensioning the visor. The visor can be
changed without tools. Proceed as follows:
• Remove the closing panels by pushing them forward with
your thumb. Fig. 19.
• Release the visor by moving the lever of the over-centre lock
upwards through about 180 degrees. Fig. 20.
• Remove the visor.
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