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B-1
OPERATION
B-1
Read and understand this entire section before oper-
ating your LFA 3.1 or 4.1 Extraction Arm.
SAFETY INSTRUCTIONS
Do not attempt to use this equipment until you have
thoroughly read all operating and maintenance man-
uals supplied with your equipment and any related
welding machine it will be used with. They include
important safety precautions, operating and mainte-
nance instructions and parts lists.
ELECTRIC SHOCK can kill.
•Do not touch electrically live parts such
as output terminals or internal wiring.
•Insulate yourself from the work and
ground.
•Always wear dry insulating gloves.
------------------------------------------------------------------------
WELDING SPARKS can cause fire or
explosion.
•Keep flammable material away.
•Do not weld upon containers which
have held combustibles.
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ARC RAYS can burn.
•Wear eye, ear and body protection.
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FUMES AND GASES
can be dangerous.
• Although the removal of the particu-
late matter from welding smoke may
reduce the ventilation requirement,
concentrations of the clear exhausted
fumes and gases may still be haz-
ardous to health. Avoid breathing
concentrations of these fumes and
gases. Use adequate ventilation
when welding. See ANSI Z49.1,
"Safety in Welding and Cutting", pub-
lished by the American Welding
Society.
------------------------------------------------------------------------
Only qualified personnel should operate this equip-
ment.
ADDITIONAL SAFETY PRECAUTIONS
Always operate the fan with the arm installed and all
covers in place as these provide maximum protection
from moving parts and insure proper vacuum opera-
tion and cooling air flow.
OPERATING INSTRUCTIONS
Turn on the connected extraction system.
For details, refer to the Operating Instructions in the
Mobiflex 200-M, Mobiflex 400-MS, or SF2400
Stationary Fan manual, as appropriate.
For optimum fume capture, position the hood within
10-15 inches (250-400 mm) of the arc. Use the rotary
valve on the base of the hood to adjust the airflow to
an apropriate level, if desired.
If using a Lamp Kit:
The switch on the hood with a lamp symbol operates
the work lamp in the hood.
If using an Auto Start/Stop Arc Sensor:
The arc sensor will automatically switch the fan on
when it senses an arc. Standard run-out time is
approximately 20 sec. The work lamp operates inde-
pendently of this sensor.
LFA 3.1 & 4.1 FUME EXTRACTION ARMS
WARNING