Maintenance Schedule; To Change The Sweatband; Spare Parts; To Change The Exhalation Membrane - Sundstrom SR 520 Instrucciones De Uso

4.3 Maintenance schedule

The schedule below represents the recommended minimum
requirement for maintenance routines in order to ensure that
the equipment will always be in functional 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 Spare 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.
• Remove the peel-offs from the new visor.
• Secure the new visor first to the fixed mounting and then to
the over-centre mounting.
• Tension the visor by moving the lever downwards as far as
it will go. Fig. 21.
• Check that the visor is firmly in contact with the visor opening
seal all round.
• Fit the closing panels by pushing them into place with your
fingers. A clicking sound indicates that they are in place. Fig.
22.
4.4.3 To change the face seal on the SR 540
EX
The plastic frame of the face seal is provided with a groove (Fig.
23) into which the visor unit frame fits (Fig. 24). The frame is
locked in position by means of two pins - one at each end - that
fit into holes in the visor unit. The ends of the face seal fabric
are provided with hooks that are secured to the head harness.
Proceed as follows:
• Release the hooks from the head harness. Fig. 25.
• Release the face seal by pulling its frame so that its pins are
released from the visor unit holes. Fig. 26.
20
• •
•
•
• Remove the face seal.
• Thread the new face seal over the visor unit flange, with the
centre markings in line with one another. Fig. 27.
• Press the face seal frame down so that the pins drop into
the visor unit holes. A clicking sound indicates that they are
in place. Fig. 28.
• Secure the hooks to the head harness in the place where
•
the sweatband is relieved. Fig. 25.
•

4.4.4 To change the sweatband

•
SR 520 and SR 530
The sweatband is secured to the forehead strap by double-
•
sided adhesive tape. Proceed as follows:
• Pick away one end of the sweatband so that it is removed
•
together with the tape.
• Pull the sweatband off.
•
• Remove the protective paper and fit the new sweatband.
SR 540 EX
The sweatband is secured to the forehead strap by means of
Velcro tape. Proceed as follows:
• Release the face seal hooks from the head harness. Fig. 25.
• Pull the sweatband off.
• Fit the Velcro strip with the ruffled side towards the forehead
strap and with the relief upwards.
• Secure the hooks to the head harness where a relief has
been made in the sweatband. Fig. 25.

5. Parts list

Part
Breathing hose for SR 540 EX
O-ring for breathing hose. Fig. 3b
Flat gasket for hose SR 540 EX. Fig. 3a
Set of valves for SR 520/SR 530
Set of valves for SR 540 EX
Sweatband for SR 520/SR 530
Sweatband for SR 540 EX
Face seal, Fig. 23
Visor set, PC, for SR 540 EX
Visor set, PETG, for SR 540 EX
Peel-off set for SR 520/SR 530 *
Cleaning tissues SR 5226, box of 50
* Must not be used in potentially explosive atmosphere
6. Approvals
CE/EN
• Hoods SR 520 and SR 530 and face shield SR 540 EX and
face shield SR 540 EX in combination with fan unit SR 500/
SR 500 EX or SR 700 are approved in accordance with EN
12941:1998, class TH3.
• Hoods SR 520 and SR 530 and face shield SR 540 EX in
combination with fan SR 500 EX are approved in accor-
dance with ATEX Directive 94/9/EC and IECEx Scheme.
ATEX-codes:
II 2 G Ex ib IIB T3 Gb
II 2 D Ex ib IIIC T195°C Db
• Face shield SR 540 EX in combination with fan unit SR 500
EX is approved in accordance with ATEX Directive 94/9/EC
and IECEx Scheme.
Ordering No.
R06-0501
R06-0202
R06-0506
R06-0201
R06-2004
R06-0203
R06-0504
T06-0504
R06-0502
T06-0502
T06-0201
H09-0401