B-3
OPERATION
B-3
LFA 3.1/4.1 MOBILE
MANUAL/AUTOMATIC
The LFA 3.1/4.1 Mobile Manual and Mobile Automatic
Extraction Arms are flexible fume extraction arms with
a 360° rotatable hood. Incorporated into the arms hood
is a throttle valve that can be fully opened, partially
opened or completely closed to control airflow at hood
opening. The hood features an airflow focus vane,
which directs the air into the hood.
The armsʼ balance system increases its durability and
stability. As soon as the arms are raised, they are free
to move in any direction. Once the arms are posi-
tioned, they are fixed into place. This makes reposi-
tioning the arms simple, easy and effortless.
The extraction arms are made of solid, lightweight, 8
inch (203 mm) diameter dent and scratch resistant
tubes. They are provided with a spring balance system
for ultra-light, user friendly positioning of the arms.
The K2633-2 and K2633-4 LFA 3.1/4.1 Mobile
Automatic arms contains an integrated Lamp & Arc
Sensor Kit in the hood. The 35W/24V halogen lamp
provides additional light to the workpiece. With the use
of a delayed arc sensor, the extraction fan will operate
automatically. The automatic start/stop utilizes a 20
second auto stop to help conserve energy and reduce
noise level.
PRODUCT COMBINATIONS
In order to operate the Mobiflex 400-MS(/HE) Base
Unit, selection of following product is required:
• K2633-1 (1) LFA 3.1 Mobile Manual (10 ft. extraction
arm); or
• K2633-3 (1) LFA 4.1 Mobile Manual (13 ft. extraction
arm); or
• K2633-2 (1) LFA 3.1 Mobile Automatic (10 ft. extrac-
tion arm with integrated Lamp & Arc Sensor Kit); or
• K2633-4 (1) LFA 4.1 Mobile Automatic (13 ft. extrac-
tion arm with integrated Lamp & Arc Sensor Kit)
• K1668-3 (1) Hose and Hood Set instead of extraction
arm
OPERATION
The air which contains welding fume is captured,
extracted and filtered, before being recirculated back
into the work environment. First, the welding fume is
extracted through an adjustable fume extraction arm
by the internal extraction fan.
Second, as the welding fume enters the Base Unit, it
passes through the prefilter. The prefilter separates
larger particles, debris and most sparks prior to the
welding fume entering the LongLife filter. Third, the air
passes from the outside through the LongLife filter car-
tridge. Fourth, after passing through the LongLife filter,
the filtered air exits the Mobiflex 400-MS(/HE) Base
Unit via the outlet grid at top of filter housing.
During use, an electronic pressure differential system
measures the static air pressure as it enters and exits
the filter cartridge. If the air pressure entering the filter
unit is greater than the air pressure exiting the filter
unit, the electronic circuit signals the internal cleaning
system to clean the filter cartridge. Compressed air
from the internal tank releases through multiple airjets
to clean one section of the filter cartridge at each air
burst. A complete cleaning cycle can be activated by
depressing a manual switch on the front of the control
panel. The particulate is blown off the filter cartridge
into a dust tray.
MOBIFLEX 400-MS(/HE) BASE UNIT & LFA 3.1/4.1 MOBILE MANUAL/AUTOMATIC
FIGURE B.1
Never use the Mobiflex 400-MS(/HE)
Base Unit without extraction arm or
Hose and Hood Set.
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ATTENTION
Worker exposure level should be
checked upon installation and peri-
odically thereafter to be certain it is
within applicable federal, state
and/or local regulations and guide-
lines (i.e. OSHA PEL and ACGIH
TLV limits in the U.S.).
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WARNING
