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Compressed air attachment SR 307
EN
1.
General information
2.
Use
3.
Technical specification
4.
Maintenance
5.
List of parts
6.
Approvals
1. General information
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 148-1:1999.
This combination then forms a breathing apparatus with continuous
air flow for connection to a compressed air supply in accordance
with EN 14594:2005 and AS/NZS 1716:2012.
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.
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.
1.1 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
filtering 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.
1.2 System description
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 hose 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.
1.3 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
141:1990 and AS/NZS 1716:2012) with about 500 g of activated
carbon, surrounded by two particle filters ( class P3 as per EN
143:1990 and AS/NZS 1716:2012). The collecting capacity is 100
16
- 150 g of oil. For further particulars of breathable air, see European
Standard EN 132:1998, Australian Standard AS/NZS 1715:2009
and any other national regulations that may be in force.
2. Use
2.1 Unpacking
Check that the equipment is complete in accordance with the pack-
ing list and that no transport damage has occurred.
2.2 Packing list
• Connection adapter with hose
• Control valve
• Belt
• Locking ring
• Flow meter
• User instructions
2.3 Functional check
On every occasion before using the equipment, check that the
minimum flow of air through the adapter is about 150 l/min.
Proceed as follows:
• Connect the breathing hose to the control valve. Fig. 3.
• Connect the compressed air hose to the control valve. Fig. 4.
• Turn the control valve knob anti-clockwise as far as it will go in
order to throttle the air flow rate to a minimum. Fig. 3.
• 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. Fig. 2.
• Read the position of the ball in the tube. It should float level with
or just above the marking on the tube.
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
2.4 Putting the equipment on
Fig 5-6
• Put the belt on and adjust the length.
• Arrange the control valve 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.
• Then adjust the harness so that the facepiece is held firmly but
comfortably in place. See the user instructions for the facepiece
you are using.
• Then fit the connection adapter of the compressed air attach-
ment to the facepiece. In combination with a full face mask, the
locking ring should always be used for securing the mounting of
the connection adapter. Fig. 1:6
• Connect the breathing hose of the compressed air attachment
3
)
to the control valve outlet. Fig. 3
• Unroll the compressed air tube and make sure that it is not twisted.
• Connect the tube to the control valve inlet. Fig 4.
• The facepiece is now being supplied with air and you can put it on.
• Use the control valve knob to set the air flow rate to suit your
current work intensity. Fig. 3
In the fully closed position (turn the knob anti-clockwise), the flow
will be the minimum, and in the fully open position (turn the knob
clockwise), the flow will be the maximum.
• The breathing hose retaining clip which is supplied can be used to
advantage for securing the breathing hose to your body. Fig. 1:11
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