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2.5 Taking the equipment off
Leave the polluted work area before taking the equipment off.
• Remove the facepiece
Releasing the compressed air tube / breathing hose
Both couplings are of safety type and are released in two stages.
Fig 7.
• Push the coupling towards the nipple.
• Pull the locking ring back.
After every period of use, check that no defects have occurred, and
clean the equipment. See 4.1.
2.6 Warnings/limitations
Warnings
As a general rule, the user must always be able to retreat to safety
without risk if the air supply should cease or if he/she must take off
the equipment for some other reason.
The equipment must not be used
• If the ambient air does not have a normal oxygen content.
• If the pollutants are unknown.
• In environments that are immediately dangerous to life and health
(IDLH).
• With oxygen or oxygen-enriched air.
• If the user finds it difficult to breathe.
• If you can smell or taste the pollutants.
• If you experience dizziness, nausea or other types of discomfort.
• If the warning whistle sounds, which indicates that the air supply
is lower than recommended.
Limitations
• Anyone who wears a beard or sideboards cannot expect the
mask to be tight.
• A person working in an explosive or flammable environment
must follow any local regulations that may be in force for such
conditions.
• At very high work intensity, a partial vacuum may occur in the
equipment during the inhalation phase, which may cause ambient
air to be drawn in.
• Use of the equipment together with spiral hose SR 360 is restricted
to situations in which there is little risk of damage to the hose and
if the freedom of movement of the user can be restricted.
• The air supply system should be equipped with an appropriately
rated and adjusted pressure relief safety valve.
• A risk assessment has to be done to avoid possible perilous
connections possible at the workplace, e.g. Nitrox.
• The SR 307 is not approved for use with a mobile compressed
air system.
3. Technical specification
Air flow rate
150 l/min (measured in the flow meter) up to 320 l/min.
Compressed air hose EC/EN
The following tubes are type approved together with all Sundström
compressed air fed equipment. Maximum working pressure 7 bar.
• SR 358. 9.5/15 mm rubber tube, made of polyester reinforced PVC.
Oil and chemicals resistent. 5–30 m.
• SR 359. 9.5/18 mm plastic tube, made of EPDM/Polyester. Anti-
static, heat resistant. 5–30 m.
• SR 360. 8/12 mm plastic spiral coiled tube made of Polyurethane.
2, 4, 6 and 8 m.
It is not allowed to join hoses together.
Compressed air supply tube AS/NZS
Approved tubes must be used if Australian Standards approval is
to be valid. Tubes from 5–30 m or coupled to 90 m may be used.
Shelf life
The equipment has a shelf life of 5 years from the date of
manufacture.
Temperature range
Storage temperature: from -20 °C to + 40 °C and a relative humid-
ity below 90 %.
Service temperature: from -10 °C to + 55 °C and a relative humidity
below 90 %.
Weight
Weight without control valve: 80 g
Working pressure
4–7 bar (400–700 kPa) measured at the connection to the control
valve.
4. Maintenance
Personnel who are responsible for maintenance of the equipment
must be trained and well acquainted with this type of work.
4.1 Cleaning
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 tissues SR 5226 are recommended for
daily care.
For particulars of cleaning of the Sundström half mask and full mask,
see the appropriate user instructions.
4.2 Storage
After cleaning, store the equipment in a dry and clean place at room
temperature. Avoid direct sunlight.
4.3 Maintenance schedule
The schedule below shows the recommended minimum require-
ments on maintenance routines, so that you will be certain that the
equipment will always be in usable condition.
Visual inspection
Functional check
Cleaning
4.4 Spare parts
Use only genuine Sundström parts. Don't modify the equipment.
The use of 'pirate parts' or any modifications made to the equipment
may reduce the protective effect and compromise the approvals
granted to the equipment.
4.4.1 Control valve
The control valve is a complete, sealed unit. Don't attempt to repair
or modify it.
4.4.2 Breathing hose
To change the breathing hose, proceed as follows:
• Cut off the hose clip with a pair of pincers and pull the hose off.
Fig. 8.
• Thread the hose clip and retaining clip (Fig. 1:11) onto the new
hose. Connect to the adapter (Fig. 1:2) and use a pair of pincers
to nip the hose clip. Fig. 9.
• Apply a load to the hose to check that it is firmly secured to the
adapter.
Before
After
Annually
use
use
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