Sundstrom SR 520 User manual

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Operating instructions
SR 520 Hood

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General information
The SR 520 Hood can be used together with the SR 500 Powered
Air-Purifying Respirator system of components to provide respiratory
protection against certain particulates, organic vapours, acid gases
and other inorganic gases.
Refer to the NIOSH Approval Label for a list of approved
components and NIOSH cautions and limitations. Before use, these
user instructions and those for the SR 500 PAPR, cartridges, filters
and compressed air attachment must be thoroughly studied and
understood.
Breathing air is supplied to the respiratory protection inlet covering
(e.g. hood, face shield) from a breathing hose connected to the fan
unit containing the appropriate canisters or filters. The pressure
generated in the face shield prevents particles and other pollutants
from entering.
The respiratory protection inlet coverings can also be used with
compressed air equipment. This combination forms a breathing
apparatus designed for continuous air flow from a compressed air
supply.
The face shield can be used in all situations for which an air-
purifying respirator is recommended. This applies particularly to
work that is hard, warm or of long duration.
When selecting equipment for SR 520 some of the factors that
should be taken into account are as follows:
•Type of pollutant
•Concentrations
•Work intensity
•Protection requirements in addition to respiratory protective advice.
Risk analysis should be carried by a person who has suitable
training and experience in the area.
Instructions for use for SR 520 should be read before use.

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3.1 Unpacking SR 520
3.2 Packing list
Check that the equipment is complete in
accordance with the packing list and
has not been damaged in transit.
Packing list:
•Hood with breathing hose.
•User instructions
•Cleaning tissue
•Protective film
3.3 Assembly
Remove the protective film on the visor.
Check that the O-ring of the hose is in
place.

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Connect the hose to the fan unit and
turn it clockwise about 1/ 8 of a turn.
Flow control
Place the head top in the flow meter and
start the fan unit.
Grip the lower part of the bag to seal
around the breathing hose.
Grip the flow meter tube with the other
hand so that the tube points vertically
upwards from the bag.
Read the position of the ball in the tube.
This should hover at a level with or
slightly above the upper marking on the
tube.
If minimum flow is not achieved,
check that:
– The flow meter is held upright.
– The ball moves freely.
– The bag seals well around the hose.

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4.3 Donning the hood
Connect the hose, put the fan unit on
and start it. See the user instructions for
the SR 500.
Adjust the head harness by adjusting
the length of the Velcro strap. This is
important for ensuring a good fit.
Grip the hose mounting with one hand
and, with the other, hold the strap in the
lower part of the hood.
Put your chin into the hood.

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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.
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.

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4.4 Doffing the hood
Leave the polluted area before
removing the respiratory protection inlet
covering and SR 500 PAPR fan unit.
Take off the respiratory inlet covering.
Switch off the fan.
Release the belt and remove the fan
unit.
After use, the SR 500 components must
be cleaned, inspected and prepared for
reuse (e.g. charge the batteries).
4.1 Cleaning
Sundström cleaning tissues SR 5226
that clean and disinfect 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.

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Snap off the valve cover from the valve
seat.
Slip of the membrane
Clean the valve seat and check that the
valve seat is ok

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Clean the exhalation membrane
Clean the valve cover on the inside and
outside.
6.2 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.
Storage temperature: from -4°F to
104°F (-20 °C to +40 °C) at a relative
humidity below 90 %.

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6.3 Maintenance schedule
The schedule represents the minimum
requirements for maintenance routines
in order to ensure that equipment will
always be in functional condition.
6.5 To change the exhalation membrane
Snap off the valve cover.
The cover must be changed at the same
time as the membrane. Proceed as
follows.
Slip off the membrane.

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Press the new membrane onto the pin.
Carefully check that the membrane is in
contact with the valve seat all way
round.
Press the valve cover into place. A
clicking sound indicates that it is in
place.
6.8 To change the sweatband
Pick away one end of the sweatband so
that it is removed together with the tape
Pull sweatband off.

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Remove the protective paper.
Fit the new sweatband.
The forehead strap and the sweatband
should be mounted edge to edge.
Mounting peel-off SR 522
Remove the protective film on the four
self adhesive dots.

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Begin to attach one of the two dots in
the upper corner of the visor.
Attach the other one in opposite upper
corner, then the two dots in lower
corner.
Recommend to not attaching more than
3 peel-offs at each other.

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SR 520 Hood
Spare parts and accessories