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of required protection for specific welding process and select the recommended shade with
the shade adjustment knob. You can select the shade from shade 9 to shade13.
Adjustment of sensitivity: Most welding applications can be performed with welding light
sensitivity set to maximum. The maximum sensitivity level is appropriate for low welding
current work, TIG, or special applications. The welding light sensitivity has to be reduced
only in some specific surrounding lighting conditions in order to avoid unwanted trigger-
ing. As a simple rule for optimum performance, it is recommended to set sensitivity to the
maximum at the beginning and then gradually reduce it, until the filter reacts only to the
welding light flashes and without annoying spurious triggering due to ambient light condi-
tions (direct sun, intensive artificial light, neighboring welder's arcs etc.).
Opening time delay adjustment: The opening time delay can be adjusted from 0.1 to 0.8
seconds. It is recommended to use a shorter delay with spot welding applications and a
longer delay with applications using higher currents and longer welding intervals. Longer
delay can also be used for low current TIG welding in order to prevent the filter opening
when the light path to the sensors is temporarily obstructed by a hand, torch, etc.
Function welding/grinding: Duo electro-optical welding filter can be used for both welding
and grinding applications. By selecting the position »Grind«, the filter switches off and it will
not be triggered by the sparks generated during grinding. Before restarting welding work,
the knob should be set back to the »Shade (9-13)« position.
RECOMMENDED SHADE LEVELS FOR VARIOUS WELDING APPLICATIONS
/ EN 379 /
WELDING
PROCESS
MMA
MAG
TIG
MIG heavy met-
als
MIG light metals
Stainless, AI
Plasma cutting
Micro plasma
welding
6
6
10
15
30
40
8
8
8
9
9
9
4
5
6
7
CURRENT IN AMPERES
60
70
100
125
150
9
10
9
10
10
11
Duo
10
Duo
10
Duo
10
11
Duo
8
9
10
175
200
225
250
300
11
12
Duo
11
12
Duo
12
13
11
12
11
12
12
13
11
12
Duo
350
400
13
14
13
13
13
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