Sundstrom SR 900 User manual

2020-10-05
OI01H-3021 SR 900 1
Operating Instruction
SR 900
Half mask APR
Revision: 03

General information
Instructions for use for SR 900 APR should be read before use.
Together with filters from the Sundström filter range in accordance with the NIOSH approval label.
Three sizes S, M and L.
Together with powered air-purifying respirator SR 500 PAPR in accordance with NIOSH approval label.
Together with Remote filter holder SR 905 according to NIOSH approval label.
When selecting equipment for SR 900 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.
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Unpacking SR 900
Check that the equipment is complete in accordance
with the packing list, and that no transport damages
have occurred.
Packing list:
• Half mask
• Pre-filter
• Pre-filter holder
• Cleaning tissue
• ID-tag
• User instructions
• Storage bag
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1. Filter
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1.1 Check that you have
selected the correct filter.
1.2 During work in
atmospheres containing both
particles and gases/vapors
(such as spray painting) the
particulate filter and chemical
cartridge should be
combined.
1.3 Place the P100 filter on
top of the cartridge. Grasp
both protective elements.
Squeeze hard until you hear
the P100 snap onto the
cartridge a snap.Attempt to
pull the filter and cartridge
apart to check that they are
properly connected.
1.4 Place a coin it in the
space between the lower lip
of the particulates filter and
the small tab molded into the
side of the cartridge.
Push firmly and twist the coin
until the filter pops off.

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1.5 Fit the filter/combined
filter in the mask so that the
arrows on the filter point
towards the user’s face.
Carefully check that the edge
of the filter is in the internal
groove of the filter mounting
all around
1.6 Fit pre-filter SR 221 in the
pre-filter holder.
Pre-filter prevents premature
clogging of the main filter.
The pre-filter holder prevents
damage to the main filter.
N.B. The pre-filter is a pre-
filter only and cannot be used
as a substitute for particulate
filter P100.
1.7 Press it into place on the
filter.
1. Filter

2. Donning
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2.1 Remove any hood,
glasses or ear protection from
head.
Holding the strap buckle, pull
the strap over your head and
put it around your neck.
Grab the pad or cradle with
one hand and the filter or
cartridge with the other.
2.2 Hold the mask against
your face.
Pull the pad or cradle over
your head and place it on the
crown of the head.
2.3 Wiggle the respirator until
it fits comfortably.
Perform a fit check.

3. Adjusting the harness
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3.1 Reach behind your neck
and grab the free end of the
harness strap.
3.2 Pull the free end away
from the neck until buckle
pops open.
3.3 Pull on the free end of the
strap until the respirator seats
comfortably on your face.
Use your thumb and
forefinger to squeeze the
buckle shut.
3.4 Wiggle the respirator until
it seats comfortably.

4. Negative Fit check
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4.1 Install a protective
element.
Snap the pre-filter holder onto
the protective element.
Put the mask on.
4.2 Place the palm of your
hand lightly over the hole on
the pre-filter holder to make it
tight. Take a deep breath and
hold your breath for about 10s.
If the mask is tight, it will be
pressed against your face.
If any leakage is detected:
• check the exhalation membranes, exhalation valves and the gasket,
• adjust the straps of head harness,
• switch to alternative size of the respirator.
Do not use the equipment if you cannot make the mask a tight fit
during the fitting test.
Note! Beard growth, scars, or other physical characteristics may
interfere with a proper fit of the respirator.

5. Change the exhalation membrane
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5.1 Snap the valve covers off
the membrane seats.
5.2 Prise off the membranes.
5.3 Press the new membrane
onto the pin. Carefully check
that the membrane is in
contact with the membrane
seat all round.
5.4 Press the valve covers
into place.A clicking sound
indicates that the cover has
snapped into place..

6. Change the inhalation membrane 7. Change the head harness
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6.1 Reach inside the
respirator and gently pull out
the inhalation membrane.
6.2 Check the edge of the
inhalation valve. Gently
stretch the flap until it slips
over the stud.
7.1 Detach the head harness
from the mask.
7.2 Attach the head harness
to the mask.

8. Change filter holder 9. Change of gasket
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8.1 Detach the filter holder
from the mask by turning it a
¼ of a lap.
8.2 Attach the new filter
holder. Make sure the gasket
is mounted correctly on the
filter holder.
9.1 Detach the filter holder
from the mask by turning it a
¼ of a lap.
9.2 Release the gasket from
the attachment on the filter
holder. Mount the new
gasket.Attach the filter
holder.

10. Cleaning
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10.1 Remove the filter, the
covers for the exhalation
valves, the membranes, the
inhalation membrane and the
head harness. The harness
can be washed but takes
extra time to dry.
10.2 Inspect all parts and
replace with new parts as
necessary. Critical areas are
the exhalation membranes
and the membrane seats
which must have clean and
undamaged contact surfaces.
Sundström cleaning tissues SR 5226 are recommended for daily
care. If the mask is heavily soiled, use a warm, Do not exceed 104 °F
(up to 40°C) mild soap solution and a soft brush, followed by rinsing
with clean water and drying in air at room temperature. If necessary,
spray the mask with 70 % ethanol or isopropanol solution for
disinfection.
NOTE! Never use solvents for cleaning.

Maintenance schedule
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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.
Before
use
After
use Annually
Visual check
•
Fit check
•
Cleaning
•
Change membrane
•
Change harness
•
Change gasket
•
Change filter
See User instructions for filters