Packing List; Functional Check; Filter Selection; Technical Specification - Sundstrom SR 90 Airline Mode D'emploi

2.2 Packing list

• Facepiece with breathing hose
• Control valve threaded onto a belt
• Sealing cover
• Pre-filter holder
• Test disc
• Flow meter
• User instructions

2.3 Functional check

On every occasion before the equipment is used, check that the air
flow – measured through the facepiece - is at least 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 facepiece on
• 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.
• Fit a suitable back-up filter or the sealing cover supplied to the
filter mounting. Fig. 1.
• Then adjust the harness so that the facepiece is held firmly but
comfortably in place. Fig. 5.
Use the test disc supplied to test the tightness. Place the test
disc in the pre-filter holder supplied and fit the holder to the
filter. Take a deep breath and hold your breath. If the facepiece
is tight, it will be pressed against your face. If the facepiece is
not tight, this may be because you wear a beard, because your
face is unshaved or is deeply wrinkled, or because the size of
your face is uncommon. Leakage may also occur through dirty
or defective exhalation valves.
N.B. The disc is intended only for tightness testing and should
be removed after the test has been completed.
• If the sealing cover is used, the tightness test can be carried
out with this cover fitted.
• Connect the breathing hose of the facepiece 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 is about 150 l/min, while in the fully open position (turn
the knob clockwise), it is around 320 l/min.
• The breathing hose retaining clip which is supplied can be used
to advantage for securing the breathing hose to your body.
Fig. 1:21.

2.4.1 Filter selection

See the user instructions for the relevant filter.
2.5 Taking the facepiece off
1. When using the back-up filter
• Remove the sealing cover, if fitted.
• Disconnect the compressed air hose from the control valve.
See below.
• Leave the polluted work area and take the equipment off.
2. When using the sealing cover
• Leave the polluted work area and then take the equipment off.
See below for details of releasing the hoses.
Releasing the compressed air tube / breathing hose
Both couplings are of safety type and are released in two stages.
Fig 6.
• 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 90 Airline is not approved for use with a mobile com-
pressed air system.

3. Technical specification

Working pressure
4–7 bar (400–700 kPa) measured at the connection to the
control valve.
19