Sundstrom SR 590 Manual Del Usuario página 19

1. General
The Sundström SR 590 welding shield is used together with the
Sundström SR 500 battery-powered fan unit and is designed
for protecting the user against inhaling harmful and irritating air
pollutants and against radiation and weld spatter during arc
welding, MAG welding and TIG welding.
2. System description
The welding shield must be equipped with a suitable welding
lens and connected by a breathing hose to the battery-powered
fan. The fan is equipped with filters and must be running when
the welding shield is in use.
The filtered air blown into the shield pressurizes it and prevents
the polluted surrounding air from reaching the user.
The shield has mountings for yoke-type ear protectors. Acces-
sories in the form of automatic welding filters, correction lenses,
neck protection and welding hoods are available.
In the event of doubt regarding 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.
3. Warnings/limitations
Warnings
The equipment must not be used
• If the surrounding 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 you find breathing difficult.
• If you can smell or taste the pollutants.
• If you feel dizzy, nauseous or suffer other discomfort.
• If the alarms of the fan are initiated (sound and light signals
and vibrations), which indicates that the air supply is lower
than recommended.
• If the fan is switched off. In this abnormal situation, the
equipment provides no protection. In addition, there is risk
of carbon dioxide quickly accumulating in the face part of
the shield, with consequent oxygen starvation.
Limitations
• Check that the welding lenses have the correct scale
number for your work.
• The shield must always be fitted with a protective lens in
addition to the welding lens.
• Always observe the fire safety rules.
• If you have a beard or sideboards, you cannot expect the
shield to be completely tight.
• If the face seal is not in contact with your face, the shield
will not be pressurized as necessary for obtaining the right
protection factor.
• If your pace of work is very intensive, a slight vacuum may
occur in the mask during the inhalation phase, which may
give rise to the risk of leakage.
• The equipment is not approved for connection to a mobile
compressed air system.
• The filters must not be connected directly to the welding
shield.
• If the equipment is used in surroundings with high wind
speeds, the protection factor may be reduced.
SR 590 Welding shield
• Keep an eye on the breathing hose to make sure that it does
not stick out, since it could then get hooked onto objects in
the surroundings.
• Never use the breathing hose for lifting or carrying the
equipment.
4. Use
4.1 Check the manufacturer's minimum
design flow (MMDF)
Before the check, also read the user instructions for fan SR
500.
• Check that the fan is complete, correctly fitted, thoroughly
cleaned and undamaged.
• Start the fan.
• Place the welding shield in the flow meter and grip the lower
part of the bag to ensure a good seal around the breathing
hose. Hold the flow meter tube with the other hand so that
the tube points vertically up from the bag. Fig. 1.
• Read the position of the ball in the tube. It should float on
a level with or slightly above the 175 l/min marking on the
tube. Fig. 2.
If the minimum flow is not achieved, check that
- the flow meter is held upright,
- the ball moves freely,
- the bag seals well around the hose.
4.2 Putting the shield on
See also the user instructions for the SR 500 fan.
• Check that the scale number of your lens is correct for your
work. The shield is delivered with a welding lens with scale
No. 10.
• Make sure that everyone in the working area is provided
with suitable protection.
• Connect the breathing hose to the shield and fan.
• Put the fan on your waist and adjust the belt so that the fan is
located firmly and comfortably at the back of your waist.
• Start the fan and adjust the air flow to suit your work
intensity.
• Raise the front piece and put the welding shield on.
• If necessary, adjust the head harness in height by lengthen-
ing or shortening the strap for the top of the head. Fig. 4a.The
sweatband should be fitted just above the eyebrows.
• If necessary, adjust the circumference of the head harness
by means of the rear knob. Fig. 4b. The head harness should
be fixed tight around your head.
• Lower the front piece by pulling the face seal down under
your chin.
• Adjust the neck size of the face seal by means of the elastic
neck strap. Fig. 6a. Insert a finger between your cheek/chin
and the face seal and run the finger along the contact
surface of the face seal all the way round to check that it
fits well against the face. Check carefully that no escaping
air comes out around the cheek and chin.
• Check that the front piece is in the fully down position, no air
should be coming out from the part above the forehead.
• Make sure that the breathing hose runs along your back and
that it is not twisted. Fig. 5.
4.3 Taking the shield off
Leave the polluted area before taking off the equipment.
• Take the welding shield off.
• Switch off the fan.
• Release the belt and remove the fan.
After use, clean and check the equipment.
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