Sundstrom SR 63 Instrucciones De Uso página 17

SR 63 Compressed air hood
Contents
1 General information
2 Use
3 Technical specification
4 Maintenance
5 List of parts
Approvals
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1. General information
The Sundström SR 63 compressed air hood is a respiratory
protective device which is supplied with a continuous flow of air
and is designed for connection to a compressed air supply in
accordance with European Standard EN 14594:2005 and AS/
NZS 1716:2003.
1.1 Applications
The SR 63 can be used as an alternative to filtering devices in
all situations in which the latter are recommended. This applies
especially if the user is doing hard or sustained work, and if
the pollutants have poor warning properties or are particularly
toxic. In addition, the SR 63 is used in environments in which the
concentration or type of pollutants is such that the use of a filtering
device is not permissible. The SR63 can also be used in flammable
atmospheres, since all parts are made from materials wich cannot
give rise to frictional sparks.
1.2 System description
The equipment is designed for connection to a suitable source of
compressed air supply. The pressure in the hood prevents polluted
ambient air from entering the hood.
A compressed air supply hose intended for breathable air is con-
nected to a control valve which is secured to a belt. The control
valve is used for adjusting the air flow rate to the hood. A warning
whistle on the valve comes into operation if the air flow rate should
drop below the recommended value.
From the control valve, the air flows through a breathing hose to
a connection at the rear of the hood. From the connection, the
air flows through a passage to the front of the hood, where it is
distributed over the surface of the visor. The hood, which covers
the head, neck and parts of the shoulders, is secured to an adjust-
able head harness. The replaceable visor is scratch-resistant. If
protection against spatter and splash is required, the visor can
be protected by means of a thin protective film available in sets of
three. Excess air in the hood is discharged through an exhalation
valve at the front of the hood. An adjustable elastic strap runs
around the neck region of the hood.
1.3 Breathable air
The breathable air shall conform to at least the following purity
requirements:
• the pollutants shall be maintained at a minimum and must never
exceed the hygienic limit value
• the content of mineral oil must be so low that the air has no oil
smell (the threshold of smell is around 0.3 mg/m3)
• the air shall have a sufficiently low dew point to avoid internal
freezing of the equipment.
In the event of uncertainty as to whether the above demands have
been met, a filter such as the Sundström types SR 49 or SR 79
compressed air filters should be connected. Fig. 12-14.
The SR 79 compressed air filter consists of a pre-collector and a
main filter. The pre-collector is of centrifugal type, and is specially
designed so that it will also be able to arrest surges of water and
oil. It is also equipped with a sintered pre-filter. The SR 79 is also
available with air heater. The SR 49 has a standard type of pre-
collector, but is fitted with the same main filter as the SR 79.
The main filter consists of a gas filter section (A3 as per EN 141:1990
and AS/NZS 1716:2003) with about 500 g of activated carbon,
surrounded by two particle filters (P3 as per EN 143:1990 and AS/
NZS 1716:2003). The collecting capacity is 100 - 150 g of oil.
For further particulars of breathable air, see European Standard
EN 132:1998, Australian Standard AS/NZS 1715:2003 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
packing list, and that no transport damage has occurred.
2.2 Packing list
• Hood with breathing hose
• Control valve
• Belt
• Flow meter
• Protective film
• User instructions
2.3 Functional check
On every occasion before the hood is used, check that the air flow
- measured in the hood - is at least 150 l/min:
• Connect the breathing hose of the facepiece to the control valve.
Fig. 3
• Connect the compressed air supply tube 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 hood in the bag and grip the opening of the bag so
that it seals around the breathing hose. Fig. 2.
• Grip the flow meter with the other hand and hold it so that it
points vertically up from the bag.
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 float can move freely.
• The air supply is not restricted by kinks or other restrictions in
the hoses.
2.4 Putting the hood 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.
• Connect the breathing hose of the hood to the outlet of the
control valve. 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 hood is now being supplied with air, and you can put it on.
If necessary, the width and height of the head harness can now
be adjusted. See 4.4.2.
• Adjust the neck width of the hood by means of the elastic
neck strap. Use the control valve knob to set the air flow rate
to suit the work intensity. Fig. 3. In the fully closed position (turn
anti-clockwise), the flow is around 150 l/min, while in the fully
open position (turn clockwise), it is around 240 l/min.
EN
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