System Description; Applications; Breathable Air; Delivery Check - Sundstrom SR 307 Mode D'emploi

Compressed air attachment SR 307
EN
1. General information
2. Parts
3. Use
4. Maintenance
5. Technical specification
6. Key to symbols
7. Approval
1. General information
Use of a respirator must be part of a respiratory protection program.
For advice see EN 529:2005 or AS/NZS 1715:2009. The guidance
contained in these standards highlights important aspects of a
respiratory protective device program but does not replace national
or local regulations.
If you feel uncertain about the selection and care of the equipment,
consult your work supervisor or get in touch with the sales outlet.
You are also welcome to get in touch with the Technical Service
Department at Sundström Safety AB.

1.1 System description

The Sundström SR 307 compressed air attachment can be used
together with Sundström half masks, and with full masks of all
makes with standard thread in accordance with EN 148-1:2019.
This combination then forms a breathing apparatus with continuous
air flow for connection to a compressed air supply.
The SR 307 mounted in a Sundström facepiece is designed for
connection to a suitable source of breathable compressed air.
The pressure in the facepiece prevents polluted ambient air from
entering the facepiece.
A compressed air supply tube which is approved for breathable
air is connected to a control valve threaded onto the user's belt.
The control valve can be used for adjusting the air flow rate to the
facepiece. From the control valve, the air flows through a breathing
hose to a connection adapter, and then into the facepiece.
The control valve is equipped with a warning whistle which will come
into operation if the air flow rate should drop below the minimun
design flow rate.
Manufacturer's minimum design flow: 120 l/min.

1.2 Applications

The SR 307 is an attachment that enables a given facepiece to be
converted between a filtering device and a protective device with
compressed air supply.
The compressed air attachment can be used as an alternative to a fil-
tering device in all situations in which the latter is recommended. This
applies particularly if the user is doing hard or sustained work, and if
the pollutants have poor warning properties or are particularly toxic.
1.3 Warnings/limitations
Note that there can be national differences in the regula tions for use
of respiratory protective equipment.
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.
Warnings
The equipment must not be used
• If the air flow test or fit test does not produce satisfactory results.
See 3.2.
• 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.
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• 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, negative pressure 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 tube SR 360 is restricted
to situations in which there is little risk of damage to the tube 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 equipment is approved only together with Sundström com-
pressed air supply tube that must be used if CE approval and
product responsibility are to apply.
• The SR 307 is not approved for use with a mobile compressed
air system.

1.4 Breathable air

Breathable air shall meet at least the following purity requirements
according to EN 12021:2014:
• the pollutants must be maintained at a minimum and must never
exceed the hygienic limit value
• the content of mineral oil shall be so low that the air will have no
oil smell. The threshold of smell is around 0.3 mg/m
• the air shall have a sufficiently low dew point to ensure that no
internal freezing will take place in the equipment
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. Fig. 10. The SR 99-1 compressed air
filter consists of a pre-collector and a main filter.
The main filter consists of a gas filter section - class A3 as per
EN 14387:2004 and AS/NZS 1716:2012 - with about 500 g of
activated carbon, surrounded by two particle filters - class P3 as
per EN 143:2000 and AS/NZS 1716:2012. The collecting capacity is
100 - 150 g of oil. For further particulars of breathable air, see Europe-
an Standard EN 132:1998, Australian Standard AS/NZS 1715:2009
and any other national regulations that may be in force.
2. Parts

2.1 Delivery check

Check that the equipment is complete in accordance with the pack-
ing list, and undamaged.
Packing list
• Connection adapter with hose
• Control valve
• Belt
• Locking ring
• Flow meter
• User instructions

2.2 Accessories / Spare parts

Fig. 1.
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