Operating Mode (Fig.2); Darkness Selection (Fig. 2-2); Delay Time Selection (Fig. 2-3); Sensibitivity Selection (Fig.2-4) - Helvi SKY 4.0 Manuel D'instruction

Operating Mode (Fig.2)

2
4
• Use the switch button (Fig.2-1)on the external side
of the welding helmet to select the appropriate opera-
ting mode, welding, cutting or grinding.
• In the welding and cutting mode the shade function
is turned on when it optically senses a welding arc. Se-
lect shade level, delay time and sensitivity according to
your needs as follows.
• In the grinding mode the shade function is turned
off. The shade is fixed to shade DIN 4 allowing a cle-
ar view to grind a weld with the helmet providing face
protection. Warning: do not use the helmet in grinding
position for any other application than grinding.

Darkness Selection (Fig. 2-2)

• Striking the arc, the observing window darkens im-
mediately. At this moment, according to the technical
requirement, you can adjust the darkness knob (Fig.
2-2) in the direction as shown by the arrow to select
the optimum darkness. The darkening range varies ac-
cording to the mode set, from 9 to 13 for the welding
mode and from 5 to 8 for the cutting mode.Refer to the
"Recommended Shade Numbers" table.

Delay Time Selection (Fig. 2-3)

• By moving the Delay selector knob, the time taken
for the lens to lighten after welding can be altered from
0.1 to 1.0s.
Turn to MIN: the time the lens lighten after welding
changes to be shorter. The shortest time is about 0.1
second depending upon welding point temperature
and shade set. This setting is ideal for track welding or
production welding with short welds.
Turn to MAX: the time the lens lighten after welding
changes to be longer. The longest time is about 1.0s
depending upon welding point temperature and shade
set. This setting is ideal for welding at high amperage
where there is an after glow from the weld and for low
current TIG welding in order to avoid the filter opening
when the light to the sensors is obstructed by the ope-
rator's hand, by the torch, etc.

Sensibitivity Selection (Fig.2-4)

• By moving the sensitivity selector knob, the sensiti-
vity to ambient light changes can be altered.
Tunr to LO (LOW): the photosensitivity changes to be
lower. Suitable for welding in bright light conditions
(lamp light or sun light).
Turn to HI (HIGH): the photosensitivity changes to be
higher. Suitable for low amperage welding and using
in poor light conditions. Suitable for using with steady
arc process such as TIG welding. If the helmet can be
used normally, we suggest using this helmet with a bit
high sensitivity.
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Helmet adjustment (Fig.3)

• Because the shapes of
FIG. 2
men's heads vary from per-
1
son to person, the work po-
sition and the observing an-
gle is different and welding
helmet needs to be adjusted
properly.
3
• Adjust the headband cir-
cumference by rotating the
knob on the back of the he-
adband (Fig. 3-1) This can
be done while wearing the
helmet to allow the right ten-
sion to be set to keep the
helmet firmly on the head without it being too tight.
• Adjust the top strap of the headband (Fig. 3-2) so
that the helmet gets placed at the right height on your
head.
• Test the fit of the headband, by lifting up and getting
down the helmet a few times while wearing it. If the
headband moves, adjust it again.
• Unscrew the side locking knobs (Fig. 3-3) and free
the locking nuts (Fig. 3-4) on both sides. Slide the hel-
met close to or far from your face to adjust the distance
from your eyes to the filter. It's important yours eyes
are both at the same distance from the lenses.
• Adjust the view angle by moving the adjustment wa-
shers to the desired position.
• Screw the side locking knobs.
External Protection Lens
• To replace the external protection lens remove the
filter cartridge by unlocking the holder locks below the
cartridge.
Internal protection Lens
• Replace the internal protection lens if damaged.
Remove the lens from the window by making it flex
and bringing it out from its place with the help of your
fingertip or fingernail.
Filter Cartridge
• To replace the filter, remove the filter cartridge from
the helmet. Make the top side of the support flexed and
remove the filter. Install the new filter with care and pro-
perly. Reposiion the filter cartridge on the helmet.
Cleaning
• Regularly clean the helmet and the filter with a dry
soft cloth. Do not use aggressive solvents.
MAINTENANCE
FIG. 3