Sundstrom SR307 Technical manual

2020-10-05
OI03H-1421 SR 307 1
SR 307
Compressed air attachment
Revision: 03
Operation instruction

General information
User´s Instructions for SR 307 should be read before use.
The Sundström model number SR 307 Compressed air attachment is a Type C, Continuous Flow, Supplied Air
Respirator (CF/SA). SR 307 has been tested and approved by NIOSH to provide the approved level of
respiratory protection to a user.
The Sundström SR 307 compressed air attachment can be used together with Sundström half mask, SR 100
and with full face mask SR 200.
Use of a respirator must be part of a respiratory protection program.
Risk analysis should be carried out by a person who has suitable training and experience in the area.
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Breathable air
Breathable air shall conform to the requirements of CGA G-7.1 Grade D or higher quality.
In the event of uncertainty as to whether the above demands have been met, a filter such as the Sundström
type SR 99-1 compressed air filter should be connected.
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Unpacking
Check that the equipment is complete in accordance
with the packing list and that no transport damage
has occurred.
Packing list
• Connection adapter with hose
• Control valve
• Belt
• Locking ring
• Flow meter
• User instructions
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1. Functional check
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1.1 Check that the mask is
complete, correctly assembled,
thoroughly cleaned and
undamaged.
Check that the airflow
measured through the mask is
at least 5.3 CFM (150 l/min).
Connect the breathing hose to
the regulator
1.2 Connect the compressed
air hose to the regulator.
1.3 Turn the control valve
knob anticlockwise as far as it
will go in order to throttle the
air flow rate to a minimum.

1. Functional check
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1.4 Place the equipment in
the bag and grip the lower
part of the bag so that the
bag seals around the
breathing hose. Grip the flow
meter with the other hand and
hold it so that the tube points
vertically up from the bag.
1.5 Read the position of the
ball in the tube. It should float
level with or just above the
marking on the tube 5.3 CFM
(150 l/min).
If the flow rate is below the minimum value, check that
• the flow meter is vertical
• the ball can move freely
• the air supply is not restricted by kinks or other restrictions in the
hoses.

2.Putting the equipment on
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2.1 Put the belt on and adjust
the length. Arrange the
regulator in a way that allows
easy adjustment of the flow
rate and a strict watch over
the breathing hose, i.e. it
must not be placed on the
back of the waist.
2.2 Then fit the compressed
air attachment to the mask.
2.3 The locking ring should
always be used for securing
the mounting of the
compressed air attachment.

2.Putting the equipment on
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2.4 Connect the breathing
hose to the control valve
outlet.
2.5 Connect the hose to the
control valve inlet.
The mask is now being
supplied with air and you can
put it on. Then adjust the
harness so that the face
piece is held firmly but
comfortably in place.
See the user instructions for
the mask you are using.
2.6 Use the regulator knob to
set the air flow rate to suit
your current work intensity.
In the fully closed position
(turn the knob anti-clockwise),
the flow is about 5.3 CFM
(150 l/min), and in the fully
open position (turn the knob
clockwise), it is about 12 CFM
(340 l/min).

3. Taking the equipment off
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3.1 Leave the polluted work
area before taking the
equipment off.
Remove the mask.
CEJN connectors:
Push the coupling towards the nipple, at the same time pulling the
locking ring back.
Schrader and Hansen connectors:
Twist the locking ring on the coupling.
Releasing the breathing hose:
Push the coupling towards the nipple, at the same time pulling the
locking ring back.
After every period of use, check that no defects have occurred, and
clean the equipment.
The breathing hose retaining clip which is supplied can be used to
advantage for securing the breathing hose to your body

4. Cleaning
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The SR 307 should be cleaned in the following manner: Use a piece
of soft cloth or a sponge dipped in a solution of water and
dishwashing detergent or the like. Rinse and leave to dry. In the event
of more serious soiling, white spirit or similar degreasing agent may
be used. Then wash with dishwashing detergent solution, rinse and
leave to dry. Sundström cleaning wipes SR 5226 are recommended
for daily care.
For particulars of cleaning of the Sundström half mask and full mask,
see the appropriate user instructions.
Sundström cleaning wipes
SR 5226 can be used for
daily cleaning.

5.Maintenance schedule
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5.1 The schedule below shows the minimum requirements on
maintenance routines to assure the user that the equipment will
always be in usable condition.
Before
use
After
use Annually
Visual inspection
• • •
Functional check
• •
Cleaning
•

6.Breathing hose
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6.1 To change the breathing
hose, proceed as follows:
Cut off the hose clip with a
pair of pincers and pull the
hose off.
6.2 Thread the hose clip and
retaining clip onto the new
hose.
6.3 Connect to the adapter
and use a pair of pincers to
nip the hose clip.
6.4 Apply a load to the hose
to check that it is firmly
secured to the compressed
air attachment.